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96fca396cf
For root scroll frames we need information about the async scrolling (or lack thereof) of the scroll frame before we get to ScrollFrameHelper::BuildDisplayList for the scroll frame. We need it in nsLayoutUtils::PaintFrame and nsSubdocumentFrame::BuildDisplayList. So we factor out all the code responsible for async scrolling decisions into one function we can call from all three places.
5770 lines
203 KiB
C++
5770 lines
203 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* rendering object to wrap rendering objects that should be scrollable */
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#include "nsGfxScrollFrame.h"
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#include "base/compiler_specific.h"
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#include "DisplayItemClip.h"
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#include "nsCOMPtr.h"
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#include "nsPresContext.h"
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#include "nsView.h"
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#include "nsIScrollable.h"
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#include "nsContainerFrame.h"
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#include "nsGkAtoms.h"
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#include "nsNameSpaceManager.h"
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#include "nsContentList.h"
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#include "nsIDocumentInlines.h"
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#include "nsFontMetrics.h"
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#include "nsBoxLayoutState.h"
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#include "mozilla/dom/NodeInfo.h"
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#include "nsScrollbarFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "nsITextControlFrame.h"
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#include "nsIDOMHTMLTextAreaElement.h"
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#include "nsNodeInfoManager.h"
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#include "nsContentCreatorFunctions.h"
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#include "nsAutoPtr.h"
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#include "nsPresState.h"
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#include "nsIHTMLDocument.h"
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#include "nsContentUtils.h"
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#include "nsLayoutUtils.h"
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#include "nsBidiPresUtils.h"
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#include "nsBidiUtils.h"
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#include "mozilla/ContentEvents.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/LookAndFeel.h"
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#include "mozilla/dom/Element.h"
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#include <stdint.h>
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#include "mozilla/MathAlgorithms.h"
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#include "FrameLayerBuilder.h"
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#include "nsSMILKeySpline.h"
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#include "nsSubDocumentFrame.h"
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#include "nsSVGOuterSVGFrame.h"
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#include "nsIObjectLoadingContent.h"
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#include "mozilla/Attributes.h"
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#include "ScrollbarActivity.h"
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#include "nsRefreshDriver.h"
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#include "nsThemeConstants.h"
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#include "nsSVGIntegrationUtils.h"
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#include "nsIScrollPositionListener.h"
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#include "StickyScrollContainer.h"
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#include "nsIFrameInlines.h"
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#include "gfxPlatform.h"
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#include "gfxPrefs.h"
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#include "AsyncScrollBase.h"
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#include "UnitTransforms.h"
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#include "nsPluginFrame.h"
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#include <mozilla/layers/AxisPhysicsModel.h>
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#include <mozilla/layers/AxisPhysicsMSDModel.h>
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#include "mozilla/unused.h"
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#include <algorithm>
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#include <cstdlib> // for std::abs(int/long)
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#include <cmath> // for std::abs(float/double)
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::layout;
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static uint32_t
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GetOverflowChange(const nsRect& aCurScrolledRect, const nsRect& aPrevScrolledRect)
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{
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uint32_t result = 0;
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if (aPrevScrolledRect.x != aCurScrolledRect.x ||
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aPrevScrolledRect.width != aCurScrolledRect.width) {
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result |= nsIScrollableFrame::HORIZONTAL;
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}
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if (aPrevScrolledRect.y != aCurScrolledRect.y ||
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aPrevScrolledRect.height != aCurScrolledRect.height) {
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result |= nsIScrollableFrame::VERTICAL;
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}
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return result;
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}
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//----------------------------------------------------------------------
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//----------nsHTMLScrollFrame-------------------------------------------
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nsHTMLScrollFrame*
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NS_NewHTMLScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, bool aIsRoot)
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{
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return new (aPresShell) nsHTMLScrollFrame(aContext, aIsRoot);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsHTMLScrollFrame)
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nsHTMLScrollFrame::nsHTMLScrollFrame(nsStyleContext* aContext, bool aIsRoot)
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: nsContainerFrame(aContext),
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mHelper(ALLOW_THIS_IN_INITIALIZER_LIST(this), aIsRoot)
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{
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}
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void
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nsHTMLScrollFrame::ScrollbarActivityStarted() const
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{
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if (mHelper.mScrollbarActivity) {
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mHelper.mScrollbarActivity->ActivityStarted();
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}
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}
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void
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nsHTMLScrollFrame::ScrollbarActivityStopped() const
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{
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if (mHelper.mScrollbarActivity) {
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mHelper.mScrollbarActivity->ActivityStopped();
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}
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}
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nsresult
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nsHTMLScrollFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
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{
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return mHelper.CreateAnonymousContent(aElements);
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}
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void
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nsHTMLScrollFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
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uint32_t aFilter)
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{
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mHelper.AppendAnonymousContentTo(aElements, aFilter);
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}
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void
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nsHTMLScrollFrame::DestroyFrom(nsIFrame* aDestructRoot)
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{
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DestroyAbsoluteFrames(aDestructRoot);
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mHelper.Destroy();
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nsContainerFrame::DestroyFrom(aDestructRoot);
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}
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void
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nsHTMLScrollFrame::SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList)
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{
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nsContainerFrame::SetInitialChildList(aListID, aChildList);
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mHelper.ReloadChildFrames();
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}
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void
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nsHTMLScrollFrame::AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList)
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{
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NS_ASSERTION(aListID == kPrincipalList, "Only main list supported");
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mFrames.AppendFrames(nullptr, aFrameList);
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mHelper.ReloadChildFrames();
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}
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void
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nsHTMLScrollFrame::InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList)
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{
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NS_ASSERTION(aListID == kPrincipalList, "Only main list supported");
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NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
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"inserting after sibling frame with different parent");
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mFrames.InsertFrames(nullptr, aPrevFrame, aFrameList);
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mHelper.ReloadChildFrames();
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}
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void
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nsHTMLScrollFrame::RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame)
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{
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NS_ASSERTION(aListID == kPrincipalList, "Only main list supported");
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mFrames.DestroyFrame(aOldFrame);
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mHelper.ReloadChildFrames();
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}
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nsSplittableType
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nsHTMLScrollFrame::GetSplittableType() const
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{
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return NS_FRAME_NOT_SPLITTABLE;
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}
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nsIAtom*
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nsHTMLScrollFrame::GetType() const
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{
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return nsGkAtoms::scrollFrame;
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}
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/**
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HTML scrolling implementation
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All other things being equal, we prefer layouts with fewer scrollbars showing.
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*/
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struct MOZ_STACK_CLASS ScrollReflowState {
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const nsHTMLReflowState& mReflowState;
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nsBoxLayoutState mBoxState;
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ScrollbarStyles mStyles;
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nsMargin mComputedBorder;
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// === Filled in by ReflowScrolledFrame ===
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nsOverflowAreas mContentsOverflowAreas;
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bool mReflowedContentsWithHScrollbar;
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bool mReflowedContentsWithVScrollbar;
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// === Filled in when TryLayout succeeds ===
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// The size of the inside-border area
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nsSize mInsideBorderSize;
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// Whether we decided to show the horizontal scrollbar
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bool mShowHScrollbar;
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// Whether we decided to show the vertical scrollbar
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bool mShowVScrollbar;
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ScrollReflowState(nsIScrollableFrame* aFrame,
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const nsHTMLReflowState& aState) :
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mReflowState(aState),
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// mBoxState is just used for scrollbars so we don't need to
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// worry about the reflow depth here
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mBoxState(aState.frame->PresContext(), aState.rendContext, 0),
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mStyles(aFrame->GetScrollbarStyles()) {
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}
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};
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// XXXldb Can this go away?
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static nsSize ComputeInsideBorderSize(ScrollReflowState* aState,
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const nsSize& aDesiredInsideBorderSize)
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{
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// aDesiredInsideBorderSize is the frame size; i.e., it includes
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// borders and padding (but the scrolled child doesn't have
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// borders). The scrolled child has the same padding as us.
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nscoord contentWidth = aState->mReflowState.ComputedWidth();
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if (contentWidth == NS_UNCONSTRAINEDSIZE) {
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contentWidth = aDesiredInsideBorderSize.width -
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aState->mReflowState.ComputedPhysicalPadding().LeftRight();
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}
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nscoord contentHeight = aState->mReflowState.ComputedHeight();
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if (contentHeight == NS_UNCONSTRAINEDSIZE) {
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contentHeight = aDesiredInsideBorderSize.height -
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aState->mReflowState.ComputedPhysicalPadding().TopBottom();
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}
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contentWidth = aState->mReflowState.ApplyMinMaxWidth(contentWidth);
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contentHeight = aState->mReflowState.ApplyMinMaxHeight(contentHeight);
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return nsSize(contentWidth + aState->mReflowState.ComputedPhysicalPadding().LeftRight(),
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contentHeight + aState->mReflowState.ComputedPhysicalPadding().TopBottom());
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}
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static void
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GetScrollbarMetrics(nsBoxLayoutState& aState, nsIFrame* aBox, nsSize* aMin,
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nsSize* aPref, bool aVertical)
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{
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NS_ASSERTION(aState.GetRenderingContext(),
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"Must have rendering context in layout state for size "
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"computations");
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if (aMin) {
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*aMin = aBox->GetMinSize(aState);
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nsBox::AddMargin(aBox, *aMin);
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if (aMin->width < 0) {
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aMin->width = 0;
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}
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if (aMin->height < 0) {
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aMin->height = 0;
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}
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}
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if (aPref) {
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*aPref = aBox->GetPrefSize(aState);
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nsBox::AddMargin(aBox, *aPref);
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if (aPref->width < 0) {
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aPref->width = 0;
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}
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if (aPref->height < 0) {
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aPref->height = 0;
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}
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}
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}
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/**
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* Assuming that we know the metrics for our wrapped frame and
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* whether the horizontal and/or vertical scrollbars are present,
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* compute the resulting layout and return true if the layout is
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* consistent. If the layout is consistent then we fill in the
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* computed fields of the ScrollReflowState.
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*
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* The layout is consistent when both scrollbars are showing if and only
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* if they should be showing. A horizontal scrollbar should be showing if all
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* following conditions are met:
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* 1) the style is not HIDDEN
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* 2) our inside-border height is at least the scrollbar height (i.e., the
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* scrollbar fits vertically)
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* 3) our scrollport width (the inside-border width minus the width allocated for a
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* vertical scrollbar, if showing) is at least the scrollbar's min-width
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* (i.e., the scrollbar fits horizontally)
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* 4) the style is SCROLL, or the kid's overflow-area XMost is
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* greater than the scrollport width
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*
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* @param aForce if true, then we just assume the layout is consistent.
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*/
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bool
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nsHTMLScrollFrame::TryLayout(ScrollReflowState* aState,
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nsHTMLReflowMetrics* aKidMetrics,
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bool aAssumeHScroll, bool aAssumeVScroll,
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bool aForce)
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{
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if ((aState->mStyles.mVertical == NS_STYLE_OVERFLOW_HIDDEN && aAssumeVScroll) ||
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(aState->mStyles.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN && aAssumeHScroll)) {
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NS_ASSERTION(!aForce, "Shouldn't be forcing a hidden scrollbar to show!");
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return false;
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}
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if (aAssumeVScroll != aState->mReflowedContentsWithVScrollbar ||
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(aAssumeHScroll != aState->mReflowedContentsWithHScrollbar &&
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ScrolledContentDependsOnHeight(aState))) {
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ReflowScrolledFrame(aState, aAssumeHScroll, aAssumeVScroll, aKidMetrics,
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false);
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}
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nsSize vScrollbarMinSize(0, 0);
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nsSize vScrollbarPrefSize(0, 0);
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if (mHelper.mVScrollbarBox) {
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GetScrollbarMetrics(aState->mBoxState, mHelper.mVScrollbarBox,
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&vScrollbarMinSize,
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aAssumeVScroll ? &vScrollbarPrefSize : nullptr, true);
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nsScrollbarFrame* scrollbar = do_QueryFrame(mHelper.mVScrollbarBox);
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scrollbar->SetScrollbarMediatorContent(mContent);
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}
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nscoord vScrollbarDesiredWidth = aAssumeVScroll ? vScrollbarPrefSize.width : 0;
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nscoord vScrollbarMinHeight = aAssumeVScroll ? vScrollbarMinSize.height : 0;
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nsSize hScrollbarMinSize(0, 0);
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nsSize hScrollbarPrefSize(0, 0);
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if (mHelper.mHScrollbarBox) {
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GetScrollbarMetrics(aState->mBoxState, mHelper.mHScrollbarBox,
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&hScrollbarMinSize,
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aAssumeHScroll ? &hScrollbarPrefSize : nullptr, false);
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nsScrollbarFrame* scrollbar = do_QueryFrame(mHelper.mHScrollbarBox);
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scrollbar->SetScrollbarMediatorContent(mContent);
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}
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nscoord hScrollbarDesiredHeight = aAssumeHScroll ? hScrollbarPrefSize.height : 0;
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nscoord hScrollbarMinWidth = aAssumeHScroll ? hScrollbarMinSize.width : 0;
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// First, compute our inside-border size and scrollport size
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// XXXldb Can we depend more on ComputeSize here?
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nsSize desiredInsideBorderSize;
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desiredInsideBorderSize.width = vScrollbarDesiredWidth +
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std::max(aKidMetrics->Width(), hScrollbarMinWidth);
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desiredInsideBorderSize.height = hScrollbarDesiredHeight +
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std::max(aKidMetrics->Height(), vScrollbarMinHeight);
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aState->mInsideBorderSize =
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ComputeInsideBorderSize(aState, desiredInsideBorderSize);
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nsSize scrollPortSize = nsSize(std::max(0, aState->mInsideBorderSize.width - vScrollbarDesiredWidth),
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std::max(0, aState->mInsideBorderSize.height - hScrollbarDesiredHeight));
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nsSize visualScrollPortSize = scrollPortSize;
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nsIPresShell* presShell = PresContext()->PresShell();
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if (mHelper.mIsRoot && presShell->IsScrollPositionClampingScrollPortSizeSet()) {
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nsSize compositionSize = nsLayoutUtils::CalculateCompositionSizeForFrame(this, false);
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float resolution = presShell->GetResolution();
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compositionSize.width /= resolution;
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compositionSize.height /= resolution;
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visualScrollPortSize = nsSize(std::max(0, compositionSize.width - vScrollbarDesiredWidth),
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std::max(0, compositionSize.height - hScrollbarDesiredHeight));
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}
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if (!aForce) {
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nsRect scrolledRect =
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mHelper.GetScrolledRectInternal(aState->mContentsOverflowAreas.ScrollableOverflow(),
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scrollPortSize);
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nscoord oneDevPixel = aState->mBoxState.PresContext()->DevPixelsToAppUnits(1);
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// If the style is HIDDEN then we already know that aAssumeHScroll is false
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if (aState->mStyles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) {
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bool wantHScrollbar =
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aState->mStyles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL ||
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scrolledRect.XMost() >= visualScrollPortSize.width + oneDevPixel ||
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scrolledRect.x <= -oneDevPixel;
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if (scrollPortSize.width < hScrollbarMinSize.width)
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wantHScrollbar = false;
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if (wantHScrollbar != aAssumeHScroll)
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return false;
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}
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// If the style is HIDDEN then we already know that aAssumeVScroll is false
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if (aState->mStyles.mVertical != NS_STYLE_OVERFLOW_HIDDEN) {
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bool wantVScrollbar =
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aState->mStyles.mVertical == NS_STYLE_OVERFLOW_SCROLL ||
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scrolledRect.YMost() >= visualScrollPortSize.height + oneDevPixel ||
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scrolledRect.y <= -oneDevPixel;
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if (scrollPortSize.height < vScrollbarMinSize.height)
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wantVScrollbar = false;
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if (wantVScrollbar != aAssumeVScroll)
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return false;
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}
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}
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nscoord vScrollbarActualWidth = aState->mInsideBorderSize.width - scrollPortSize.width;
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aState->mShowHScrollbar = aAssumeHScroll;
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aState->mShowVScrollbar = aAssumeVScroll;
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nsPoint scrollPortOrigin(aState->mComputedBorder.left,
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aState->mComputedBorder.top);
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if (!IsScrollbarOnRight()) {
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scrollPortOrigin.x += vScrollbarActualWidth;
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}
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mHelper.mScrollPort = nsRect(scrollPortOrigin, scrollPortSize);
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return true;
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}
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// XXX Height/BSize mismatch needs to be addressed here; check the caller!
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// Currently this will only behave as expected for horizontal writing modes.
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// (See bug 1175509.)
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bool
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nsHTMLScrollFrame::ScrolledContentDependsOnHeight(ScrollReflowState* aState)
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{
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// Return true if ReflowScrolledFrame is going to do something different
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// based on the presence of a horizontal scrollbar.
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return (mHelper.mScrolledFrame->GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_BSIZE) ||
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aState->mReflowState.ComputedBSize() != NS_UNCONSTRAINEDSIZE ||
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aState->mReflowState.ComputedMinBSize() > 0 ||
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aState->mReflowState.ComputedMaxBSize() != NS_UNCONSTRAINEDSIZE;
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}
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void
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nsHTMLScrollFrame::ReflowScrolledFrame(ScrollReflowState* aState,
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bool aAssumeHScroll,
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bool aAssumeVScroll,
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nsHTMLReflowMetrics* aMetrics,
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bool aFirstPass)
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{
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WritingMode wm = mHelper.mScrolledFrame->GetWritingMode();
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// these could be NS_UNCONSTRAINEDSIZE ... std::min arithmetic should
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// be OK
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LogicalMargin padding = aState->mReflowState.ComputedLogicalPadding();
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nscoord availISize =
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aState->mReflowState.ComputedISize() + padding.IStartEnd(wm);
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nscoord computedBSize = aState->mReflowState.ComputedBSize();
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nscoord computedMinBSize = aState->mReflowState.ComputedMinBSize();
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nscoord computedMaxBSize = aState->mReflowState.ComputedMaxBSize();
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if (!ShouldPropagateComputedBSizeToScrolledContent()) {
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computedBSize = NS_UNCONSTRAINEDSIZE;
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computedMinBSize = 0;
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computedMaxBSize = NS_UNCONSTRAINEDSIZE;
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}
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if (wm.IsVertical()) {
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if (aAssumeVScroll) {
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nsSize vScrollbarPrefSize;
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GetScrollbarMetrics(aState->mBoxState, mHelper.mVScrollbarBox,
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nullptr, &vScrollbarPrefSize, false);
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if (computedBSize != NS_UNCONSTRAINEDSIZE) {
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computedBSize = std::max(0, computedBSize - vScrollbarPrefSize.width);
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}
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|
computedMinBSize = std::max(0, computedMinBSize - vScrollbarPrefSize.width);
|
|
if (computedMaxBSize != NS_UNCONSTRAINEDSIZE) {
|
|
computedMaxBSize = std::max(0, computedMaxBSize - vScrollbarPrefSize.width);
|
|
}
|
|
}
|
|
|
|
if (aAssumeHScroll) {
|
|
nsSize hScrollbarPrefSize;
|
|
GetScrollbarMetrics(aState->mBoxState, mHelper.mHScrollbarBox,
|
|
nullptr, &hScrollbarPrefSize, true);
|
|
availISize = std::max(0, availISize - hScrollbarPrefSize.height);
|
|
}
|
|
} else {
|
|
if (aAssumeHScroll) {
|
|
nsSize hScrollbarPrefSize;
|
|
GetScrollbarMetrics(aState->mBoxState, mHelper.mHScrollbarBox,
|
|
nullptr, &hScrollbarPrefSize, false);
|
|
if (computedBSize != NS_UNCONSTRAINEDSIZE) {
|
|
computedBSize = std::max(0, computedBSize - hScrollbarPrefSize.height);
|
|
}
|
|
computedMinBSize = std::max(0, computedMinBSize - hScrollbarPrefSize.height);
|
|
if (computedMaxBSize != NS_UNCONSTRAINEDSIZE) {
|
|
computedMaxBSize = std::max(0, computedMaxBSize - hScrollbarPrefSize.height);
|
|
}
|
|
}
|
|
|
|
if (aAssumeVScroll) {
|
|
nsSize vScrollbarPrefSize;
|
|
GetScrollbarMetrics(aState->mBoxState, mHelper.mVScrollbarBox,
|
|
nullptr, &vScrollbarPrefSize, true);
|
|
availISize = std::max(0, availISize - vScrollbarPrefSize.width);
|
|
}
|
|
}
|
|
|
|
nsPresContext* presContext = PresContext();
|
|
|
|
// Pass false for aInit so we can pass in the correct padding.
|
|
nsHTMLReflowState
|
|
kidReflowState(presContext, aState->mReflowState,
|
|
mHelper.mScrolledFrame,
|
|
LogicalSize(wm, availISize, NS_UNCONSTRAINEDSIZE),
|
|
nullptr, nsHTMLReflowState::CALLER_WILL_INIT);
|
|
const nsMargin physicalPadding = padding.GetPhysicalMargin(wm);
|
|
kidReflowState.Init(presContext, nullptr, nullptr,
|
|
&physicalPadding);
|
|
kidReflowState.mFlags.mAssumingHScrollbar = aAssumeHScroll;
|
|
kidReflowState.mFlags.mAssumingVScrollbar = aAssumeVScroll;
|
|
kidReflowState.SetComputedBSize(computedBSize);
|
|
kidReflowState.ComputedMinBSize() = computedMinBSize;
|
|
kidReflowState.ComputedMaxBSize() = computedMaxBSize;
|
|
if (aState->mReflowState.IsBResize()) {
|
|
kidReflowState.SetBResize(true);
|
|
}
|
|
|
|
// Temporarily set mHasHorizontalScrollbar/mHasVerticalScrollbar to
|
|
// reflect our assumptions while we reflow the child.
|
|
bool didHaveHorizontalScrollbar = mHelper.mHasHorizontalScrollbar;
|
|
bool didHaveVerticalScrollbar = mHelper.mHasVerticalScrollbar;
|
|
mHelper.mHasHorizontalScrollbar = aAssumeHScroll;
|
|
mHelper.mHasVerticalScrollbar = aAssumeVScroll;
|
|
|
|
nsReflowStatus status;
|
|
// No need to pass a true container-size to ReflowChild or
|
|
// FinishReflowChild, because it's only used there when positioning
|
|
// the frame (i.e. if NS_FRAME_NO_MOVE_FRAME isn't set)
|
|
const nsSize dummyContainerSize;
|
|
ReflowChild(mHelper.mScrolledFrame, presContext, *aMetrics,
|
|
kidReflowState, wm, LogicalPoint(wm), dummyContainerSize,
|
|
NS_FRAME_NO_MOVE_FRAME, status);
|
|
|
|
mHelper.mHasHorizontalScrollbar = didHaveHorizontalScrollbar;
|
|
mHelper.mHasVerticalScrollbar = didHaveVerticalScrollbar;
|
|
|
|
// Don't resize or position the view (if any) because we're going to resize
|
|
// it to the correct size anyway in PlaceScrollArea. Allowing it to
|
|
// resize here would size it to the natural height of the frame,
|
|
// which will usually be different from the scrollport height;
|
|
// invalidating the difference will cause unnecessary repainting.
|
|
FinishReflowChild(mHelper.mScrolledFrame, presContext,
|
|
*aMetrics, &kidReflowState, wm, LogicalPoint(wm),
|
|
dummyContainerSize,
|
|
NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_SIZE_VIEW);
|
|
|
|
// XXX Some frames (e.g., nsPluginFrame, nsFrameFrame, nsTextFrame) don't bother
|
|
// setting their mOverflowArea. This is wrong because every frame should
|
|
// always set mOverflowArea. In fact nsPluginFrame and nsFrameFrame don't
|
|
// support the 'outline' property because of this. Rather than fix the world
|
|
// right now, just fix up the overflow area if necessary. Note that we don't
|
|
// check HasOverflowRect() because it could be set even though the
|
|
// overflow area doesn't include the frame bounds.
|
|
aMetrics->UnionOverflowAreasWithDesiredBounds();
|
|
|
|
if (MOZ_UNLIKELY(StyleDisplay()->mOverflowClipBox ==
|
|
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX)) {
|
|
nsOverflowAreas childOverflow;
|
|
nsLayoutUtils::UnionChildOverflow(mHelper.mScrolledFrame, childOverflow);
|
|
nsRect childScrollableOverflow = childOverflow.ScrollableOverflow();
|
|
childScrollableOverflow.Inflate(padding.GetPhysicalMargin(wm));
|
|
nsRect contentArea =
|
|
wm.IsVertical() ? nsRect(0, 0, computedBSize, availISize)
|
|
: nsRect(0, 0, availISize, computedBSize);
|
|
if (!contentArea.Contains(childScrollableOverflow)) {
|
|
aMetrics->mOverflowAreas.ScrollableOverflow() = childScrollableOverflow;
|
|
}
|
|
}
|
|
|
|
aState->mContentsOverflowAreas = aMetrics->mOverflowAreas;
|
|
aState->mReflowedContentsWithHScrollbar = aAssumeHScroll;
|
|
aState->mReflowedContentsWithVScrollbar = aAssumeVScroll;
|
|
}
|
|
|
|
bool
|
|
nsHTMLScrollFrame::GuessHScrollbarNeeded(const ScrollReflowState& aState)
|
|
{
|
|
if (aState.mStyles.mHorizontal != NS_STYLE_OVERFLOW_AUTO)
|
|
// no guessing required
|
|
return aState.mStyles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL;
|
|
|
|
return mHelper.mHasHorizontalScrollbar;
|
|
}
|
|
|
|
bool
|
|
nsHTMLScrollFrame::GuessVScrollbarNeeded(const ScrollReflowState& aState)
|
|
{
|
|
if (aState.mStyles.mVertical != NS_STYLE_OVERFLOW_AUTO)
|
|
// no guessing required
|
|
return aState.mStyles.mVertical == NS_STYLE_OVERFLOW_SCROLL;
|
|
|
|
// If we've had at least one non-initial reflow, then just assume
|
|
// the state of the vertical scrollbar will be what we determined
|
|
// last time.
|
|
if (mHelper.mHadNonInitialReflow) {
|
|
return mHelper.mHasVerticalScrollbar;
|
|
}
|
|
|
|
// If this is the initial reflow, guess false because usually
|
|
// we have very little content by then.
|
|
if (InInitialReflow())
|
|
return false;
|
|
|
|
if (mHelper.mIsRoot) {
|
|
nsIFrame *f = mHelper.mScrolledFrame->GetFirstPrincipalChild();
|
|
if (f && f->GetType() == nsGkAtoms::svgOuterSVGFrame &&
|
|
static_cast<nsSVGOuterSVGFrame*>(f)->VerticalScrollbarNotNeeded()) {
|
|
// Common SVG case - avoid a bad guess.
|
|
return false;
|
|
}
|
|
// Assume that there will be a scrollbar; it seems to me
|
|
// that 'most pages' do have a scrollbar, and anyway, it's cheaper
|
|
// to do an extra reflow for the pages that *don't* need a
|
|
// scrollbar (because on average they will have less content).
|
|
return true;
|
|
}
|
|
|
|
// For non-viewports, just guess that we don't need a scrollbar.
|
|
// XXX I wonder if statistically this is the right idea; I'm
|
|
// basically guessing that there are a lot of overflow:auto DIVs
|
|
// that get their intrinsic size and don't overflow
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
nsHTMLScrollFrame::InInitialReflow() const
|
|
{
|
|
// We're in an initial reflow if NS_FRAME_FIRST_REFLOW is set, unless we're a
|
|
// root scrollframe. In that case we want to skip this clause altogether.
|
|
// The guess here is that there are lots of overflow:auto divs out there that
|
|
// end up auto-sizing so they don't overflow, and that the root basically
|
|
// always needs a scrollbar if it did last time we loaded this page (good
|
|
// assumption, because our initial reflow is no longer synchronous).
|
|
return !mHelper.mIsRoot && (GetStateBits() & NS_FRAME_FIRST_REFLOW);
|
|
}
|
|
|
|
void
|
|
nsHTMLScrollFrame::ReflowContents(ScrollReflowState* aState,
|
|
const nsHTMLReflowMetrics& aDesiredSize)
|
|
{
|
|
nsHTMLReflowMetrics kidDesiredSize(aDesiredSize.GetWritingMode(), aDesiredSize.mFlags);
|
|
ReflowScrolledFrame(aState, GuessHScrollbarNeeded(*aState),
|
|
GuessVScrollbarNeeded(*aState), &kidDesiredSize, true);
|
|
|
|
// There's an important special case ... if the child appears to fit
|
|
// in the inside-border rect (but overflows the scrollport), we
|
|
// should try laying it out without a vertical scrollbar. It will
|
|
// usually fit because making the available-width wider will not
|
|
// normally make the child taller. (The only situation I can think
|
|
// of is when you have a line containing %-width inline replaced
|
|
// elements whose percentages sum to more than 100%, so increasing
|
|
// the available width makes the line break where it was fitting
|
|
// before.) If we don't treat this case specially, then we will
|
|
// decide that showing scrollbars is OK because the content
|
|
// overflows when we're showing scrollbars and we won't try to
|
|
// remove the vertical scrollbar.
|
|
|
|
// Detecting when we enter this special case is important for when
|
|
// people design layouts that exactly fit the container "most of the
|
|
// time".
|
|
|
|
// XXX Is this check really sufficient to catch all the incremental cases
|
|
// where the ideal case doesn't have a scrollbar?
|
|
if ((aState->mReflowedContentsWithHScrollbar || aState->mReflowedContentsWithVScrollbar) &&
|
|
aState->mStyles.mVertical != NS_STYLE_OVERFLOW_SCROLL &&
|
|
aState->mStyles.mHorizontal != NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize insideBorderSize =
|
|
ComputeInsideBorderSize(aState,
|
|
nsSize(kidDesiredSize.Width(), kidDesiredSize.Height()));
|
|
nsRect scrolledRect =
|
|
mHelper.GetScrolledRectInternal(kidDesiredSize.ScrollableOverflow(),
|
|
insideBorderSize);
|
|
if (nsRect(nsPoint(0, 0), insideBorderSize).Contains(scrolledRect)) {
|
|
// Let's pretend we had no scrollbars coming in here
|
|
ReflowScrolledFrame(aState, false, false, &kidDesiredSize, false);
|
|
}
|
|
}
|
|
|
|
// Try vertical scrollbar settings that leave the vertical scrollbar unchanged.
|
|
// Do this first because changing the vertical scrollbar setting is expensive,
|
|
// forcing a reflow always.
|
|
|
|
// Try leaving the horizontal scrollbar unchanged first. This will be more
|
|
// efficient.
|
|
if (TryLayout(aState, &kidDesiredSize, aState->mReflowedContentsWithHScrollbar,
|
|
aState->mReflowedContentsWithVScrollbar, false))
|
|
return;
|
|
if (TryLayout(aState, &kidDesiredSize, !aState->mReflowedContentsWithHScrollbar,
|
|
aState->mReflowedContentsWithVScrollbar, false))
|
|
return;
|
|
|
|
// OK, now try toggling the vertical scrollbar. The performance advantage
|
|
// of trying the status-quo horizontal scrollbar state
|
|
// does not exist here (we'll have to reflow due to the vertical scrollbar
|
|
// change), so always try no horizontal scrollbar first.
|
|
bool newVScrollbarState = !aState->mReflowedContentsWithVScrollbar;
|
|
if (TryLayout(aState, &kidDesiredSize, false, newVScrollbarState, false))
|
|
return;
|
|
if (TryLayout(aState, &kidDesiredSize, true, newVScrollbarState, false))
|
|
return;
|
|
|
|
// OK, we're out of ideas. Try again enabling whatever scrollbars we can
|
|
// enable and force the layout to stick even if it's inconsistent.
|
|
// This just happens sometimes.
|
|
TryLayout(aState, &kidDesiredSize,
|
|
aState->mStyles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN,
|
|
aState->mStyles.mVertical != NS_STYLE_OVERFLOW_HIDDEN,
|
|
true);
|
|
}
|
|
|
|
void
|
|
nsHTMLScrollFrame::PlaceScrollArea(const ScrollReflowState& aState,
|
|
const nsPoint& aScrollPosition)
|
|
{
|
|
nsIFrame *scrolledFrame = mHelper.mScrolledFrame;
|
|
// Set the x,y of the scrolled frame to the correct value
|
|
scrolledFrame->SetPosition(mHelper.mScrollPort.TopLeft() - aScrollPosition);
|
|
|
|
nsRect scrolledArea;
|
|
// Preserve the width or height of empty rects
|
|
nsSize portSize = mHelper.mScrollPort.Size();
|
|
nsRect scrolledRect =
|
|
mHelper.GetScrolledRectInternal(aState.mContentsOverflowAreas.ScrollableOverflow(),
|
|
portSize);
|
|
scrolledArea.UnionRectEdges(scrolledRect,
|
|
nsRect(nsPoint(0,0), portSize));
|
|
|
|
// Store the new overflow area. Note that this changes where an outline
|
|
// of the scrolled frame would be painted, but scrolled frames can't have
|
|
// outlines (the outline would go on this scrollframe instead).
|
|
// Using FinishAndStoreOverflow is needed so the overflow rect
|
|
// gets set correctly. It also messes with the overflow rect in the
|
|
// -moz-hidden-unscrollable case, but scrolled frames can't have
|
|
// 'overflow' either.
|
|
// This needs to happen before SyncFrameViewAfterReflow so
|
|
// HasOverflowRect() will return the correct value.
|
|
nsOverflowAreas overflow(scrolledArea, scrolledArea);
|
|
scrolledFrame->FinishAndStoreOverflow(overflow,
|
|
scrolledFrame->GetSize());
|
|
|
|
// Note that making the view *exactly* the size of the scrolled area
|
|
// is critical, since the view scrolling code uses the size of the
|
|
// scrolled view to clamp scroll requests.
|
|
// Normally the scrolledFrame won't have a view but in some cases it
|
|
// might create its own.
|
|
nsContainerFrame::SyncFrameViewAfterReflow(scrolledFrame->PresContext(),
|
|
scrolledFrame,
|
|
scrolledFrame->GetView(),
|
|
scrolledArea,
|
|
0);
|
|
}
|
|
|
|
nscoord
|
|
nsHTMLScrollFrame::GetIntrinsicVScrollbarWidth(nsRenderingContext *aRenderingContext)
|
|
{
|
|
ScrollbarStyles ss = GetScrollbarStyles();
|
|
if (ss.mVertical != NS_STYLE_OVERFLOW_SCROLL || !mHelper.mVScrollbarBox)
|
|
return 0;
|
|
|
|
// Don't need to worry about reflow depth here since it's
|
|
// just for scrollbars
|
|
nsBoxLayoutState bls(PresContext(), aRenderingContext, 0);
|
|
nsSize vScrollbarPrefSize(0, 0);
|
|
GetScrollbarMetrics(bls, mHelper.mVScrollbarBox,
|
|
nullptr, &vScrollbarPrefSize, true);
|
|
return vScrollbarPrefSize.width;
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
nsHTMLScrollFrame::GetMinISize(nsRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result = mHelper.mScrolledFrame->GetMinISize(aRenderingContext);
|
|
DISPLAY_MIN_WIDTH(this, result);
|
|
return result + GetIntrinsicVScrollbarWidth(aRenderingContext);
|
|
}
|
|
|
|
/* virtual */ nscoord
|
|
nsHTMLScrollFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
|
|
{
|
|
nscoord result = mHelper.mScrolledFrame->GetPrefISize(aRenderingContext);
|
|
DISPLAY_PREF_WIDTH(this, result);
|
|
return NSCoordSaturatingAdd(result, GetIntrinsicVScrollbarWidth(aRenderingContext));
|
|
}
|
|
|
|
nsresult
|
|
nsHTMLScrollFrame::GetPadding(nsMargin& aMargin)
|
|
{
|
|
// Our padding hangs out on the inside of the scrollframe, but XUL doesn't
|
|
// reaize that. If we're stuck inside a XUL box, we need to claim no
|
|
// padding.
|
|
// @see also nsXULScrollFrame::GetPadding.
|
|
aMargin.SizeTo(0,0,0,0);
|
|
return NS_OK;
|
|
}
|
|
|
|
bool
|
|
nsHTMLScrollFrame::IsCollapsed()
|
|
{
|
|
// We're never collapsed in the box sense.
|
|
return false;
|
|
}
|
|
|
|
// Return the <browser> if the scrollframe is for the root frame directly
|
|
// inside a <browser>.
|
|
static nsIContent*
|
|
GetBrowserRoot(nsIContent* aContent)
|
|
{
|
|
if (aContent) {
|
|
nsIDocument* doc = aContent->GetCurrentDoc();
|
|
nsPIDOMWindow* win = doc->GetWindow();
|
|
if (win) {
|
|
nsCOMPtr<Element> frameElement = win->GetFrameElementInternal();
|
|
if (frameElement &&
|
|
frameElement->NodeInfo()->Equals(nsGkAtoms::browser, kNameSpaceID_XUL))
|
|
return frameElement;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
void
|
|
nsHTMLScrollFrame::Reflow(nsPresContext* aPresContext,
|
|
nsHTMLReflowMetrics& aDesiredSize,
|
|
const nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aStatus)
|
|
{
|
|
MarkInReflow();
|
|
DO_GLOBAL_REFLOW_COUNT("nsHTMLScrollFrame");
|
|
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
|
|
|
|
mHelper.HandleScrollbarStyleSwitching();
|
|
|
|
ScrollReflowState state(this, aReflowState);
|
|
// sanity check: ensure that if we have no scrollbar, we treat it
|
|
// as hidden.
|
|
if (!mHelper.mVScrollbarBox || mHelper.mNeverHasVerticalScrollbar)
|
|
state.mStyles.mVertical = NS_STYLE_OVERFLOW_HIDDEN;
|
|
if (!mHelper.mHScrollbarBox || mHelper.mNeverHasHorizontalScrollbar)
|
|
state.mStyles.mHorizontal = NS_STYLE_OVERFLOW_HIDDEN;
|
|
|
|
//------------ Handle Incremental Reflow -----------------
|
|
bool reflowHScrollbar = true;
|
|
bool reflowVScrollbar = true;
|
|
bool reflowScrollCorner = true;
|
|
if (!aReflowState.ShouldReflowAllKids()) {
|
|
#define NEEDS_REFLOW(frame_) \
|
|
((frame_) && NS_SUBTREE_DIRTY(frame_))
|
|
|
|
reflowHScrollbar = NEEDS_REFLOW(mHelper.mHScrollbarBox);
|
|
reflowVScrollbar = NEEDS_REFLOW(mHelper.mVScrollbarBox);
|
|
reflowScrollCorner = NEEDS_REFLOW(mHelper.mScrollCornerBox) ||
|
|
NEEDS_REFLOW(mHelper.mResizerBox);
|
|
|
|
#undef NEEDS_REFLOW
|
|
}
|
|
|
|
if (mHelper.mIsRoot) {
|
|
mHelper.mCollapsedResizer = true;
|
|
|
|
nsIContent* browserRoot = GetBrowserRoot(mContent);
|
|
if (browserRoot) {
|
|
bool showResizer = browserRoot->HasAttr(kNameSpaceID_None, nsGkAtoms::showresizer);
|
|
reflowScrollCorner = showResizer == mHelper.mCollapsedResizer;
|
|
mHelper.mCollapsedResizer = !showResizer;
|
|
}
|
|
}
|
|
|
|
nsRect oldScrollAreaBounds = mHelper.mScrollPort;
|
|
nsRect oldScrolledAreaBounds =
|
|
mHelper.mScrolledFrame->GetScrollableOverflowRectRelativeToParent();
|
|
nsPoint oldScrollPosition = mHelper.GetScrollPosition();
|
|
|
|
state.mComputedBorder = aReflowState.ComputedPhysicalBorderPadding() -
|
|
aReflowState.ComputedPhysicalPadding();
|
|
|
|
ReflowContents(&state, aDesiredSize);
|
|
|
|
// Restore the old scroll position, for now, even if that's not valid anymore
|
|
// because we changed size. We'll fix it up in a post-reflow callback, because
|
|
// our current size may only be temporary (e.g. we're compute XUL desired sizes).
|
|
PlaceScrollArea(state, oldScrollPosition);
|
|
if (!mHelper.mPostedReflowCallback) {
|
|
// Make sure we'll try scrolling to restored position
|
|
PresContext()->PresShell()->PostReflowCallback(&mHelper);
|
|
mHelper.mPostedReflowCallback = true;
|
|
}
|
|
|
|
bool didHaveHScrollbar = mHelper.mHasHorizontalScrollbar;
|
|
bool didHaveVScrollbar = mHelper.mHasVerticalScrollbar;
|
|
mHelper.mHasHorizontalScrollbar = state.mShowHScrollbar;
|
|
mHelper.mHasVerticalScrollbar = state.mShowVScrollbar;
|
|
nsRect newScrollAreaBounds = mHelper.mScrollPort;
|
|
nsRect newScrolledAreaBounds =
|
|
mHelper.mScrolledFrame->GetScrollableOverflowRectRelativeToParent();
|
|
if (mHelper.mSkippedScrollbarLayout ||
|
|
reflowHScrollbar || reflowVScrollbar || reflowScrollCorner ||
|
|
(GetStateBits() & NS_FRAME_IS_DIRTY) ||
|
|
didHaveHScrollbar != state.mShowHScrollbar ||
|
|
didHaveVScrollbar != state.mShowVScrollbar ||
|
|
!oldScrollAreaBounds.IsEqualEdges(newScrollAreaBounds) ||
|
|
!oldScrolledAreaBounds.IsEqualEdges(newScrolledAreaBounds)) {
|
|
if (!mHelper.mSupppressScrollbarUpdate) {
|
|
mHelper.mSkippedScrollbarLayout = false;
|
|
mHelper.SetScrollbarVisibility(mHelper.mHScrollbarBox, state.mShowHScrollbar);
|
|
mHelper.SetScrollbarVisibility(mHelper.mVScrollbarBox, state.mShowVScrollbar);
|
|
// place and reflow scrollbars
|
|
nsRect insideBorderArea =
|
|
nsRect(nsPoint(state.mComputedBorder.left, state.mComputedBorder.top),
|
|
state.mInsideBorderSize);
|
|
mHelper.LayoutScrollbars(state.mBoxState, insideBorderArea,
|
|
oldScrollAreaBounds);
|
|
} else {
|
|
mHelper.mSkippedScrollbarLayout = true;
|
|
}
|
|
}
|
|
|
|
aDesiredSize.Width() = state.mInsideBorderSize.width +
|
|
state.mComputedBorder.LeftRight();
|
|
aDesiredSize.Height() = state.mInsideBorderSize.height +
|
|
state.mComputedBorder.TopBottom();
|
|
|
|
aDesiredSize.SetOverflowAreasToDesiredBounds();
|
|
if (mHelper.IsIgnoringViewportClipping()) {
|
|
aDesiredSize.mOverflowAreas.UnionWith(
|
|
state.mContentsOverflowAreas + mHelper.mScrolledFrame->GetPosition());
|
|
}
|
|
|
|
mHelper.UpdateSticky();
|
|
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowState, aStatus);
|
|
|
|
if (!InInitialReflow() && !mHelper.mHadNonInitialReflow) {
|
|
mHelper.mHadNonInitialReflow = true;
|
|
}
|
|
|
|
if (mHelper.mIsRoot && !oldScrolledAreaBounds.IsEqualEdges(newScrolledAreaBounds)) {
|
|
mHelper.PostScrolledAreaEvent();
|
|
}
|
|
|
|
mHelper.UpdatePrevScrolledRect();
|
|
|
|
aStatus = NS_FRAME_COMPLETE;
|
|
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
|
|
mHelper.PostOverflowEvent();
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
nsresult
|
|
nsHTMLScrollFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("HTMLScroll"), aResult);
|
|
}
|
|
#endif
|
|
|
|
#ifdef ACCESSIBILITY
|
|
a11y::AccType
|
|
nsHTMLScrollFrame::AccessibleType()
|
|
{
|
|
if (IsTableCaption()) {
|
|
return GetRect().IsEmpty() ? a11y::eNoType : a11y::eHTMLCaptionType;
|
|
}
|
|
|
|
// Create an accessible regardless of focusable state because the state can be
|
|
// changed during frame life cycle without any notifications to accessibility.
|
|
if (mContent->IsRootOfNativeAnonymousSubtree() ||
|
|
GetScrollbarStyles().IsHiddenInBothDirections()) {
|
|
return a11y::eNoType;
|
|
}
|
|
|
|
return a11y::eHyperTextType;
|
|
}
|
|
#endif
|
|
|
|
NS_QUERYFRAME_HEAD(nsHTMLScrollFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
|
|
NS_QUERYFRAME_ENTRY(nsIScrollableFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIStatefulFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIScrollbarMediator)
|
|
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
|
|
|
|
//----------nsXULScrollFrame-------------------------------------------
|
|
|
|
nsXULScrollFrame*
|
|
NS_NewXULScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
|
|
bool aIsRoot, bool aClipAllDescendants)
|
|
{
|
|
return new (aPresShell) nsXULScrollFrame(aContext, aIsRoot,
|
|
aClipAllDescendants);
|
|
}
|
|
|
|
NS_IMPL_FRAMEARENA_HELPERS(nsXULScrollFrame)
|
|
|
|
nsXULScrollFrame::nsXULScrollFrame(nsStyleContext* aContext,
|
|
bool aIsRoot, bool aClipAllDescendants)
|
|
: nsBoxFrame(aContext, aIsRoot),
|
|
mHelper(ALLOW_THIS_IN_INITIALIZER_LIST(this), aIsRoot)
|
|
{
|
|
SetLayoutManager(nullptr);
|
|
mHelper.mClipAllDescendants = aClipAllDescendants;
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::ScrollbarActivityStarted() const
|
|
{
|
|
if (mHelper.mScrollbarActivity) {
|
|
mHelper.mScrollbarActivity->ActivityStarted();
|
|
}
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::ScrollbarActivityStopped() const
|
|
{
|
|
if (mHelper.mScrollbarActivity) {
|
|
mHelper.mScrollbarActivity->ActivityStopped();
|
|
}
|
|
}
|
|
|
|
nsMargin
|
|
ScrollFrameHelper::GetDesiredScrollbarSizes(nsBoxLayoutState* aState)
|
|
{
|
|
NS_ASSERTION(aState && aState->GetRenderingContext(),
|
|
"Must have rendering context in layout state for size "
|
|
"computations");
|
|
|
|
nsMargin result(0, 0, 0, 0);
|
|
|
|
if (mVScrollbarBox) {
|
|
nsSize size = mVScrollbarBox->GetPrefSize(*aState);
|
|
nsBox::AddMargin(mVScrollbarBox, size);
|
|
if (IsScrollbarOnRight())
|
|
result.left = size.width;
|
|
else
|
|
result.right = size.width;
|
|
}
|
|
|
|
if (mHScrollbarBox) {
|
|
nsSize size = mHScrollbarBox->GetPrefSize(*aState);
|
|
nsBox::AddMargin(mHScrollbarBox, size);
|
|
// We don't currently support any scripts that would require a scrollbar
|
|
// at the top. (Are there any?)
|
|
result.bottom = size.height;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
nscoord
|
|
ScrollFrameHelper::GetNondisappearingScrollbarWidth(nsBoxLayoutState* aState,
|
|
WritingMode aWM)
|
|
{
|
|
NS_ASSERTION(aState && aState->GetRenderingContext(),
|
|
"Must have rendering context in layout state for size "
|
|
"computations");
|
|
|
|
bool verticalWM = aWM.IsVertical();
|
|
if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
|
|
// We're using overlay scrollbars, so we need to get the width that
|
|
// non-disappearing scrollbars would have.
|
|
nsITheme* theme = aState->PresContext()->GetTheme();
|
|
if (theme &&
|
|
theme->ThemeSupportsWidget(aState->PresContext(),
|
|
verticalWM ? mHScrollbarBox
|
|
: mVScrollbarBox,
|
|
NS_THEME_SCROLLBAR_NON_DISAPPEARING)) {
|
|
LayoutDeviceIntSize size;
|
|
bool canOverride = true;
|
|
theme->GetMinimumWidgetSize(aState->PresContext(),
|
|
verticalWM ? mHScrollbarBox
|
|
: mVScrollbarBox,
|
|
NS_THEME_SCROLLBAR_NON_DISAPPEARING,
|
|
&size,
|
|
&canOverride);
|
|
return aState->PresContext()->
|
|
DevPixelsToAppUnits(verticalWM ? size.height : size.width);
|
|
}
|
|
}
|
|
|
|
nsMargin sizes(GetDesiredScrollbarSizes(aState));
|
|
return verticalWM ? sizes.TopBottom() : sizes.LeftRight();
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::HandleScrollbarStyleSwitching()
|
|
{
|
|
// Check if we switched between scrollbar styles.
|
|
if (mScrollbarActivity &&
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) == 0) {
|
|
mScrollbarActivity->Destroy();
|
|
mScrollbarActivity = nullptr;
|
|
mOuter->PresContext()->ThemeChanged();
|
|
}
|
|
else if (!mScrollbarActivity &&
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
|
|
mScrollbarActivity = new ScrollbarActivity(do_QueryFrame(mOuter));
|
|
mOuter->PresContext()->ThemeChanged();
|
|
}
|
|
}
|
|
|
|
#if defined(MOZ_B2G) || (defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ))
|
|
static bool IsFocused(nsIContent* aContent)
|
|
{
|
|
// Some content elements, like the GetContent() of a scroll frame
|
|
// for a text input field, are inside anonymous subtrees, but the focus
|
|
// manager always reports a non-anonymous element as the focused one, so
|
|
// walk up the tree until we reach a non-anonymous element.
|
|
while (aContent && aContent->IsInAnonymousSubtree()) {
|
|
aContent = aContent->GetParent();
|
|
}
|
|
|
|
return aContent ? nsContentUtils::IsFocusedContent(aContent) : false;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ScrollFrameHelper::SetZoomableByAPZ(bool aZoomable)
|
|
{
|
|
if (mZoomableByAPZ != aZoomable) {
|
|
// We might be changing the result of WantAsyncScroll() so schedule a
|
|
// paint to make sure we pick up the result of that change.
|
|
mZoomableByAPZ = aZoomable;
|
|
mOuter->SchedulePaint();
|
|
}
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::WantAsyncScroll() const
|
|
{
|
|
// If zooming is allowed, and this is a frame that's allowed to zoom, then
|
|
// we want it to be async-scrollable or zooming will not be permitted.
|
|
if (mZoomableByAPZ) {
|
|
return true;
|
|
}
|
|
|
|
ScrollbarStyles styles = GetScrollbarStylesFromFrame();
|
|
uint32_t directions = mOuter->GetScrollTargetFrame()->GetPerceivedScrollingDirections();
|
|
bool isVScrollable = !!(directions & nsIScrollableFrame::VERTICAL) &&
|
|
(styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN);
|
|
bool isHScrollable = !!(directions & nsIScrollableFrame::HORIZONTAL) &&
|
|
(styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN);
|
|
|
|
#if defined(MOZ_B2G) || (defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ))
|
|
// Mobile platforms need focus to scroll.
|
|
bool canScrollWithoutScrollbars = IsFocused(mOuter->GetContent());
|
|
#else
|
|
bool canScrollWithoutScrollbars = true;
|
|
#endif
|
|
|
|
// The check for scroll bars was added in bug 825692 to prevent layerization
|
|
// of text inputs for performance reasons.
|
|
bool isVAsyncScrollable = isVScrollable && (mVScrollbarBox || canScrollWithoutScrollbars);
|
|
bool isHAsyncScrollable = isHScrollable && (mHScrollbarBox || canScrollWithoutScrollbars);
|
|
return isVAsyncScrollable || isHAsyncScrollable;
|
|
}
|
|
|
|
static nsRect
|
|
GetOnePixelRangeAroundPoint(nsPoint aPoint, bool aIsHorizontal)
|
|
{
|
|
nsRect allowedRange(aPoint, nsSize());
|
|
nscoord halfPixel = nsPresContext::CSSPixelsToAppUnits(0.5f);
|
|
if (aIsHorizontal) {
|
|
allowedRange.x = aPoint.x - halfPixel;
|
|
allowedRange.width = halfPixel*2 - 1;
|
|
} else {
|
|
allowedRange.y = aPoint.y - halfPixel;
|
|
allowedRange.height = halfPixel*2 - 1;
|
|
}
|
|
return allowedRange;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
ScrollByUnit(aScrollbar, nsIScrollableFrame::SMOOTH, aDirection,
|
|
nsIScrollableFrame::PAGES, aSnap);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
ScrollByUnit(aScrollbar, nsIScrollableFrame::INSTANT, aDirection,
|
|
nsIScrollableFrame::WHOLE, aSnap);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
bool isHorizontal = aScrollbar->IsHorizontal();
|
|
nsIntPoint delta;
|
|
if (isHorizontal) {
|
|
const double kScrollMultiplier =
|
|
Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
|
|
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
|
|
delta.x = aDirection * kScrollMultiplier;
|
|
if (GetLineScrollAmount().width * delta.x > GetPageScrollAmount().width) {
|
|
// The scroll frame is so small that the delta would be more
|
|
// than an entire page. Scroll by one page instead to maintain
|
|
// context.
|
|
ScrollByPage(aScrollbar, aDirection);
|
|
return;
|
|
}
|
|
} else {
|
|
const double kScrollMultiplier =
|
|
Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
|
|
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
|
|
delta.y = aDirection * kScrollMultiplier;
|
|
if (GetLineScrollAmount().height * delta.y > GetPageScrollAmount().height) {
|
|
// The scroll frame is so small that the delta would be more
|
|
// than an entire page. Scroll by one page instead to maintain
|
|
// context.
|
|
ScrollByPage(aScrollbar, aDirection);
|
|
return;
|
|
}
|
|
}
|
|
|
|
nsIntPoint overflow;
|
|
ScrollBy(delta, nsIScrollableFrame::LINES, nsIScrollableFrame::SMOOTH,
|
|
&overflow, nsGkAtoms::other, nsIScrollableFrame::NOT_MOMENTUM,
|
|
aSnap);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::RepeatButtonScroll(nsScrollbarFrame* aScrollbar)
|
|
{
|
|
aScrollbar->MoveToNewPosition();
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ThumbMoved(nsScrollbarFrame* aScrollbar,
|
|
nscoord aOldPos,
|
|
nscoord aNewPos)
|
|
{
|
|
MOZ_ASSERT(aScrollbar != nullptr);
|
|
bool isHorizontal = aScrollbar->IsHorizontal();
|
|
nsPoint current = GetScrollPosition();
|
|
nsPoint dest = current;
|
|
if (isHorizontal) {
|
|
dest.x = IsLTR() ? aNewPos : aNewPos - GetScrollRange().width;
|
|
} else {
|
|
dest.y = aNewPos;
|
|
}
|
|
nsRect allowedRange = GetOnePixelRangeAroundPoint(dest, isHorizontal);
|
|
|
|
// Don't try to scroll if we're already at an acceptable place.
|
|
// Don't call Contains here since Contains returns false when the point is
|
|
// on the bottom or right edge of the rectangle.
|
|
if (allowedRange.ClampPoint(current) == current) {
|
|
return;
|
|
}
|
|
|
|
ScrollTo(dest, nsIScrollableFrame::INSTANT, &allowedRange);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollbarReleased(nsScrollbarFrame* aScrollbar)
|
|
{
|
|
// Scrollbar scrolling does not result in fling gestures, clear any
|
|
// accumulated velocity
|
|
mVelocityQueue.Reset();
|
|
|
|
// Perform scroll snapping, if needed. Scrollbar movement uses the same
|
|
// smooth scrolling animation as keyboard scrolling.
|
|
ScrollSnap(mDestination, nsIScrollableFrame::SMOOTH);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollByUnit(nsScrollbarFrame* aScrollbar,
|
|
nsIScrollableFrame::ScrollMode aMode,
|
|
int32_t aDirection,
|
|
nsIScrollableFrame::ScrollUnit aUnit,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
MOZ_ASSERT(aScrollbar != nullptr);
|
|
bool isHorizontal = aScrollbar->IsHorizontal();
|
|
nsIntPoint delta;
|
|
if (isHorizontal) {
|
|
delta.x = aDirection;
|
|
} else {
|
|
delta.y = aDirection;
|
|
}
|
|
nsIntPoint overflow;
|
|
ScrollBy(delta, aUnit, aMode, &overflow, nsGkAtoms::other,
|
|
nsIScrollableFrame::NOT_MOMENTUM, aSnap);
|
|
}
|
|
|
|
nsresult
|
|
nsXULScrollFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
|
|
{
|
|
return mHelper.CreateAnonymousContent(aElements);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
|
|
uint32_t aFilter)
|
|
{
|
|
mHelper.AppendAnonymousContentTo(aElements, aFilter);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::DestroyFrom(nsIFrame* aDestructRoot)
|
|
{
|
|
mHelper.Destroy();
|
|
nsBoxFrame::DestroyFrom(aDestructRoot);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::SetInitialChildList(ChildListID aListID,
|
|
nsFrameList& aChildList)
|
|
{
|
|
nsBoxFrame::SetInitialChildList(aListID, aChildList);
|
|
mHelper.ReloadChildFrames();
|
|
}
|
|
|
|
|
|
void
|
|
nsXULScrollFrame::AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList)
|
|
{
|
|
nsBoxFrame::AppendFrames(aListID, aFrameList);
|
|
mHelper.ReloadChildFrames();
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::InsertFrames(ChildListID aListID,
|
|
nsIFrame* aPrevFrame,
|
|
nsFrameList& aFrameList)
|
|
{
|
|
nsBoxFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
|
|
mHelper.ReloadChildFrames();
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::RemoveFrame(ChildListID aListID,
|
|
nsIFrame* aOldFrame)
|
|
{
|
|
nsBoxFrame::RemoveFrame(aListID, aOldFrame);
|
|
mHelper.ReloadChildFrames();
|
|
}
|
|
|
|
nsSplittableType
|
|
nsXULScrollFrame::GetSplittableType() const
|
|
{
|
|
return NS_FRAME_NOT_SPLITTABLE;
|
|
}
|
|
|
|
nsresult
|
|
nsXULScrollFrame::GetPadding(nsMargin& aMargin)
|
|
{
|
|
aMargin.SizeTo(0,0,0,0);
|
|
return NS_OK;
|
|
}
|
|
|
|
nsIAtom*
|
|
nsXULScrollFrame::GetType() const
|
|
{
|
|
return nsGkAtoms::scrollFrame;
|
|
}
|
|
|
|
nscoord
|
|
nsXULScrollFrame::GetBoxAscent(nsBoxLayoutState& aState)
|
|
{
|
|
if (!mHelper.mScrolledFrame)
|
|
return 0;
|
|
|
|
nscoord ascent = mHelper.mScrolledFrame->GetBoxAscent(aState);
|
|
nsMargin m(0,0,0,0);
|
|
GetBorderAndPadding(m);
|
|
ascent += m.top;
|
|
GetMargin(m);
|
|
ascent += m.top;
|
|
|
|
return ascent;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetPrefSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize pref = mHelper.mScrolledFrame->GetPrefSize(aState);
|
|
|
|
ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
// scrolled frames don't have their own margins
|
|
|
|
if (mHelper.mVScrollbarBox &&
|
|
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize vSize = mHelper.mVScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mHelper.mVScrollbarBox, vSize);
|
|
pref.width += vSize.width;
|
|
}
|
|
|
|
if (mHelper.mHScrollbarBox &&
|
|
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize hSize = mHelper.mHScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mHelper.mHScrollbarBox, hSize);
|
|
pref.height += hSize.height;
|
|
}
|
|
|
|
AddBorderAndPadding(pref);
|
|
bool widthSet, heightSet;
|
|
nsIFrame::AddCSSPrefSize(this, pref, widthSet, heightSet);
|
|
return pref;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetMinSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize min = mHelper.mScrolledFrame->GetMinSizeForScrollArea(aState);
|
|
|
|
ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
if (mHelper.mVScrollbarBox &&
|
|
styles.mVertical == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize vSize = mHelper.mVScrollbarBox->GetMinSize(aState);
|
|
AddMargin(mHelper.mVScrollbarBox, vSize);
|
|
min.width += vSize.width;
|
|
if (min.height < vSize.height)
|
|
min.height = vSize.height;
|
|
}
|
|
|
|
if (mHelper.mHScrollbarBox &&
|
|
styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL) {
|
|
nsSize hSize = mHelper.mHScrollbarBox->GetMinSize(aState);
|
|
AddMargin(mHelper.mHScrollbarBox, hSize);
|
|
min.height += hSize.height;
|
|
if (min.width < hSize.width)
|
|
min.width = hSize.width;
|
|
}
|
|
|
|
AddBorderAndPadding(min);
|
|
bool widthSet, heightSet;
|
|
nsIFrame::AddCSSMinSize(aState, this, min, widthSet, heightSet);
|
|
return min;
|
|
}
|
|
|
|
nsSize
|
|
nsXULScrollFrame::GetMaxSize(nsBoxLayoutState& aState)
|
|
{
|
|
#ifdef DEBUG_LAYOUT
|
|
PropagateDebug(aState);
|
|
#endif
|
|
|
|
nsSize maxSize(NS_INTRINSICSIZE, NS_INTRINSICSIZE);
|
|
|
|
AddBorderAndPadding(maxSize);
|
|
bool widthSet, heightSet;
|
|
nsIFrame::AddCSSMaxSize(this, maxSize, widthSet, heightSet);
|
|
return maxSize;
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
nsresult
|
|
nsXULScrollFrame::GetFrameName(nsAString& aResult) const
|
|
{
|
|
return MakeFrameName(NS_LITERAL_STRING("XULScroll"), aResult);
|
|
}
|
|
#endif
|
|
|
|
NS_IMETHODIMP
|
|
nsXULScrollFrame::DoLayout(nsBoxLayoutState& aState)
|
|
{
|
|
uint32_t flags = aState.LayoutFlags();
|
|
nsresult rv = Layout(aState);
|
|
aState.SetLayoutFlags(flags);
|
|
|
|
nsBox::DoLayout(aState);
|
|
return rv;
|
|
}
|
|
|
|
NS_QUERYFRAME_HEAD(nsXULScrollFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
|
|
NS_QUERYFRAME_ENTRY(nsIScrollableFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIStatefulFrame)
|
|
NS_QUERYFRAME_ENTRY(nsIScrollbarMediator)
|
|
NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
|
|
|
|
//-------------------- Helper ----------------------
|
|
|
|
#define SMOOTH_SCROLL_PREF_NAME "general.smoothScroll"
|
|
|
|
// AsyncSmoothMSDScroll has ref counting.
|
|
class ScrollFrameHelper::AsyncSmoothMSDScroll final : public nsARefreshObserver {
|
|
public:
|
|
AsyncSmoothMSDScroll(const nsPoint &aInitialPosition,
|
|
const nsPoint &aInitialDestination,
|
|
const nsSize &aInitialVelocity,
|
|
const nsRect &aRange,
|
|
const mozilla::TimeStamp &aStartTime,
|
|
nsPresContext* aPresContext)
|
|
: mXAxisModel(aInitialPosition.x, aInitialDestination.x,
|
|
aInitialVelocity.width,
|
|
gfxPrefs::ScrollBehaviorSpringConstant(),
|
|
gfxPrefs::ScrollBehaviorDampingRatio())
|
|
, mYAxisModel(aInitialPosition.y, aInitialDestination.y,
|
|
aInitialVelocity.height,
|
|
gfxPrefs::ScrollBehaviorSpringConstant(),
|
|
gfxPrefs::ScrollBehaviorDampingRatio())
|
|
, mRange(aRange)
|
|
, mLastRefreshTime(aStartTime)
|
|
, mCallee(nullptr)
|
|
, mOneDevicePixelInAppUnits(aPresContext->DevPixelsToAppUnits(1))
|
|
{
|
|
}
|
|
|
|
NS_INLINE_DECL_REFCOUNTING(AsyncSmoothMSDScroll, override)
|
|
|
|
nsSize GetVelocity() {
|
|
// In nscoords per second
|
|
return nsSize(mXAxisModel.GetVelocity(), mYAxisModel.GetVelocity());
|
|
}
|
|
|
|
nsPoint GetPosition() {
|
|
// In nscoords
|
|
return nsPoint(NSToCoordRound(mXAxisModel.GetPosition()), NSToCoordRound(mYAxisModel.GetPosition()));
|
|
}
|
|
|
|
void SetDestination(const nsPoint &aDestination) {
|
|
mXAxisModel.SetDestination(static_cast<int32_t>(aDestination.x));
|
|
mYAxisModel.SetDestination(static_cast<int32_t>(aDestination.y));
|
|
}
|
|
|
|
void SetRange(const nsRect &aRange)
|
|
{
|
|
mRange = aRange;
|
|
}
|
|
|
|
nsRect GetRange()
|
|
{
|
|
return mRange;
|
|
}
|
|
|
|
void Simulate(const TimeDuration& aDeltaTime)
|
|
{
|
|
mXAxisModel.Simulate(aDeltaTime);
|
|
mYAxisModel.Simulate(aDeltaTime);
|
|
|
|
nsPoint desired = GetPosition();
|
|
nsPoint clamped = mRange.ClampPoint(desired);
|
|
if(desired.x != clamped.x) {
|
|
// The scroll has hit the "wall" at the left or right edge of the allowed
|
|
// scroll range.
|
|
// Absorb the impact to avoid bounceback effect.
|
|
mXAxisModel.SetVelocity(0.0);
|
|
mXAxisModel.SetPosition(clamped.x);
|
|
}
|
|
|
|
if(desired.y != clamped.y) {
|
|
// The scroll has hit the "wall" at the left or right edge of the allowed
|
|
// scroll range.
|
|
// Absorb the impact to avoid bounceback effect.
|
|
mYAxisModel.SetVelocity(0.0);
|
|
mYAxisModel.SetPosition(clamped.y);
|
|
}
|
|
}
|
|
|
|
bool IsFinished()
|
|
{
|
|
return mXAxisModel.IsFinished(mOneDevicePixelInAppUnits) &&
|
|
mYAxisModel.IsFinished(mOneDevicePixelInAppUnits);
|
|
}
|
|
|
|
virtual void WillRefresh(mozilla::TimeStamp aTime) override {
|
|
mozilla::TimeDuration deltaTime = aTime - mLastRefreshTime;
|
|
mLastRefreshTime = aTime;
|
|
|
|
// The callback may release "this".
|
|
// We don't access members after returning, so no need for KungFuDeathGrip.
|
|
ScrollFrameHelper::AsyncSmoothMSDScrollCallback(mCallee, deltaTime);
|
|
}
|
|
|
|
/*
|
|
* Set a refresh observer for smooth scroll iterations (and start observing).
|
|
* Should be used at most once during the lifetime of this object.
|
|
* Return value: true on success, false otherwise.
|
|
*/
|
|
bool SetRefreshObserver(ScrollFrameHelper *aCallee) {
|
|
NS_ASSERTION(aCallee && !mCallee, "AsyncSmoothMSDScroll::SetRefreshObserver - Invalid usage.");
|
|
|
|
if (!RefreshDriver(aCallee)->AddRefreshObserver(this, Flush_Style)) {
|
|
return false;
|
|
}
|
|
|
|
mCallee = aCallee;
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
// Private destructor, to discourage deletion outside of Release():
|
|
~AsyncSmoothMSDScroll() {
|
|
RemoveObserver();
|
|
}
|
|
|
|
nsRefreshDriver* RefreshDriver(ScrollFrameHelper* aCallee) {
|
|
return aCallee->mOuter->PresContext()->RefreshDriver();
|
|
}
|
|
|
|
/*
|
|
* The refresh driver doesn't hold a reference to its observers,
|
|
* so releasing this object can (and is) used to remove the observer on DTOR.
|
|
* Currently, this object is released once the scrolling ends.
|
|
*/
|
|
void RemoveObserver() {
|
|
if (mCallee) {
|
|
RefreshDriver(mCallee)->RemoveRefreshObserver(this, Flush_Style);
|
|
}
|
|
}
|
|
|
|
mozilla::layers::AxisPhysicsMSDModel mXAxisModel, mYAxisModel;
|
|
nsRect mRange;
|
|
mozilla::TimeStamp mLastRefreshTime;
|
|
ScrollFrameHelper *mCallee;
|
|
nscoord mOneDevicePixelInAppUnits;
|
|
};
|
|
|
|
// AsyncScroll has ref counting.
|
|
class ScrollFrameHelper::AsyncScroll final
|
|
: public nsARefreshObserver,
|
|
public AsyncScrollBase
|
|
{
|
|
public:
|
|
typedef mozilla::TimeStamp TimeStamp;
|
|
typedef mozilla::TimeDuration TimeDuration;
|
|
|
|
explicit AsyncScroll(nsPoint aStartPos)
|
|
: AsyncScrollBase(aStartPos)
|
|
, mCallee(nullptr)
|
|
{}
|
|
|
|
private:
|
|
// Private destructor, to discourage deletion outside of Release():
|
|
~AsyncScroll() {
|
|
RemoveObserver();
|
|
}
|
|
|
|
public:
|
|
void InitSmoothScroll(TimeStamp aTime, nsPoint aDestination,
|
|
nsIAtom *aOrigin, const nsRect& aRange,
|
|
const nsSize& aCurrentVelocity);
|
|
void Init(const nsRect& aRange) {
|
|
mRange = aRange;
|
|
}
|
|
|
|
// Most recent scroll origin.
|
|
nsCOMPtr<nsIAtom> mOrigin;
|
|
|
|
// Allowed destination positions around mDestination
|
|
nsRect mRange;
|
|
bool mIsSmoothScroll;
|
|
|
|
private:
|
|
void InitPreferences(TimeStamp aTime, nsIAtom *aOrigin);
|
|
|
|
// The next section is observer/callback management
|
|
// Bodies of WillRefresh and RefreshDriver contain ScrollFrameHelper specific code.
|
|
public:
|
|
NS_INLINE_DECL_REFCOUNTING(AsyncScroll, override)
|
|
|
|
/*
|
|
* Set a refresh observer for smooth scroll iterations (and start observing).
|
|
* Should be used at most once during the lifetime of this object.
|
|
* Return value: true on success, false otherwise.
|
|
*/
|
|
bool SetRefreshObserver(ScrollFrameHelper *aCallee) {
|
|
NS_ASSERTION(aCallee && !mCallee, "AsyncScroll::SetRefreshObserver - Invalid usage.");
|
|
|
|
if (!RefreshDriver(aCallee)->AddRefreshObserver(this, Flush_Style)) {
|
|
return false;
|
|
}
|
|
|
|
mCallee = aCallee;
|
|
return true;
|
|
}
|
|
|
|
virtual void WillRefresh(mozilla::TimeStamp aTime) override {
|
|
// The callback may release "this".
|
|
// We don't access members after returning, so no need for KungFuDeathGrip.
|
|
ScrollFrameHelper::AsyncScrollCallback(mCallee, aTime);
|
|
}
|
|
|
|
private:
|
|
ScrollFrameHelper *mCallee;
|
|
|
|
nsRefreshDriver* RefreshDriver(ScrollFrameHelper* aCallee) {
|
|
return aCallee->mOuter->PresContext()->RefreshDriver();
|
|
}
|
|
|
|
/*
|
|
* The refresh driver doesn't hold a reference to its observers,
|
|
* so releasing this object can (and is) used to remove the observer on DTOR.
|
|
* Currently, this object is released once the scrolling ends.
|
|
*/
|
|
void RemoveObserver() {
|
|
if (mCallee) {
|
|
RefreshDriver(mCallee)->RemoveRefreshObserver(this, Flush_Style);
|
|
}
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Calculate duration, possibly dynamically according to events rate and event origin.
|
|
* (also maintain previous timestamps - which are only used here).
|
|
*/
|
|
void
|
|
ScrollFrameHelper::AsyncScroll::InitPreferences(TimeStamp aTime, nsIAtom *aOrigin)
|
|
{
|
|
if (!aOrigin){
|
|
aOrigin = nsGkAtoms::other;
|
|
}
|
|
|
|
// Read preferences only on first iteration or for a different event origin.
|
|
if (!mIsFirstIteration && aOrigin == mOrigin) {
|
|
return;
|
|
}
|
|
|
|
mOrigin = aOrigin;
|
|
mOriginMinMS = mOriginMaxMS = 0;
|
|
bool isOriginSmoothnessEnabled = false;
|
|
mIntervalRatio = 1;
|
|
|
|
// Default values for all preferences are defined in all.js
|
|
static const int32_t kDefaultMinMS = 150, kDefaultMaxMS = 150;
|
|
static const bool kDefaultIsSmoothEnabled = true;
|
|
|
|
nsAutoCString originName;
|
|
aOrigin->ToUTF8String(originName);
|
|
nsAutoCString prefBase = NS_LITERAL_CSTRING("general.smoothScroll.") + originName;
|
|
|
|
isOriginSmoothnessEnabled = Preferences::GetBool(prefBase.get(), kDefaultIsSmoothEnabled);
|
|
if (isOriginSmoothnessEnabled) {
|
|
nsAutoCString prefMin = prefBase + NS_LITERAL_CSTRING(".durationMinMS");
|
|
nsAutoCString prefMax = prefBase + NS_LITERAL_CSTRING(".durationMaxMS");
|
|
mOriginMinMS = Preferences::GetInt(prefMin.get(), kDefaultMinMS);
|
|
mOriginMaxMS = Preferences::GetInt(prefMax.get(), kDefaultMaxMS);
|
|
|
|
static const int32_t kSmoothScrollMaxAllowedAnimationDurationMS = 10000;
|
|
mOriginMaxMS = clamped(mOriginMaxMS, 0, kSmoothScrollMaxAllowedAnimationDurationMS);
|
|
mOriginMinMS = clamped(mOriginMinMS, 0, mOriginMaxMS);
|
|
}
|
|
|
|
// Keep the animation duration longer than the average event intervals
|
|
// (to "connect" consecutive scroll animations before the scroll comes to a stop).
|
|
static const double kDefaultDurationToIntervalRatio = 2; // Duplicated at all.js
|
|
mIntervalRatio = Preferences::GetInt("general.smoothScroll.durationToIntervalRatio",
|
|
kDefaultDurationToIntervalRatio * 100) / 100.0;
|
|
|
|
// Duration should be at least as long as the intervals -> ratio is at least 1
|
|
mIntervalRatio = std::max(1.0, mIntervalRatio);
|
|
|
|
if (mIsFirstIteration) {
|
|
InitializeHistory(aTime);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::AsyncScroll::InitSmoothScroll(TimeStamp aTime,
|
|
nsPoint aDestination,
|
|
nsIAtom *aOrigin,
|
|
const nsRect& aRange,
|
|
const nsSize& aCurrentVelocity)
|
|
{
|
|
InitPreferences(aTime, aOrigin);
|
|
mRange = aRange;
|
|
|
|
Update(aTime, aDestination, aCurrentVelocity);
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsSmoothScrollingEnabled()
|
|
{
|
|
return Preferences::GetBool(SMOOTH_SCROLL_PREF_NAME, false);
|
|
}
|
|
|
|
class ScrollFrameActivityTracker final : public nsExpirationTracker<ScrollFrameHelper,4> {
|
|
public:
|
|
// Wait for 3-4s between scrolls before we remove our layers.
|
|
// That's 4 generations of 1s each.
|
|
enum { TIMEOUT_MS = 1000 };
|
|
ScrollFrameActivityTracker()
|
|
: nsExpirationTracker<ScrollFrameHelper,4>(TIMEOUT_MS,
|
|
"ScrollFrameActivityTracker")
|
|
{}
|
|
~ScrollFrameActivityTracker() {
|
|
AgeAllGenerations();
|
|
}
|
|
|
|
virtual void NotifyExpired(ScrollFrameHelper *aObject) {
|
|
RemoveObject(aObject);
|
|
aObject->MarkNotRecentlyScrolled();
|
|
}
|
|
};
|
|
|
|
static ScrollFrameActivityTracker *gScrollFrameActivityTracker = nullptr;
|
|
|
|
// There are situations when a scroll frame is destroyed and then re-created
|
|
// for the same content element. In this case we want to increment the scroll
|
|
// generation between the old and new scrollframes. If the new one knew about
|
|
// the old one then it could steal the old generation counter and increment it
|
|
// but it doesn't have that reference so instead we use a static global to
|
|
// ensure the new one gets a fresh value.
|
|
static uint32_t sScrollGenerationCounter = 0;
|
|
|
|
ScrollFrameHelper::ScrollFrameHelper(nsContainerFrame* aOuter,
|
|
bool aIsRoot)
|
|
: mHScrollbarBox(nullptr)
|
|
, mVScrollbarBox(nullptr)
|
|
, mScrolledFrame(nullptr)
|
|
, mScrollCornerBox(nullptr)
|
|
, mResizerBox(nullptr)
|
|
, mOuter(aOuter)
|
|
, mAsyncScroll(nullptr)
|
|
, mAsyncSmoothMSDScroll(nullptr)
|
|
, mLastScrollOrigin(nsGkAtoms::other)
|
|
, mLastSmoothScrollOrigin(nullptr)
|
|
, mScrollGeneration(++sScrollGenerationCounter)
|
|
, mDestination(0, 0)
|
|
, mScrollPosAtLastPaint(0, 0)
|
|
, mRestorePos(-1, -1)
|
|
, mLastPos(-1, -1)
|
|
, mResolution(1.0)
|
|
, mScrollPosForLayerPixelAlignment(-1, -1)
|
|
, mLastUpdateImagesPos(-1, -1)
|
|
, mNeverHasVerticalScrollbar(false)
|
|
, mNeverHasHorizontalScrollbar(false)
|
|
, mHasVerticalScrollbar(false)
|
|
, mHasHorizontalScrollbar(false)
|
|
, mFrameIsUpdatingScrollbar(false)
|
|
, mDidHistoryRestore(false)
|
|
, mIsRoot(aIsRoot)
|
|
, mClipAllDescendants(aIsRoot)
|
|
, mSupppressScrollbarUpdate(false)
|
|
, mSkippedScrollbarLayout(false)
|
|
, mHadNonInitialReflow(false)
|
|
, mHorizontalOverflow(false)
|
|
, mVerticalOverflow(false)
|
|
, mPostedReflowCallback(false)
|
|
, mMayHaveDirtyFixedChildren(false)
|
|
, mUpdateScrollbarAttributes(false)
|
|
, mHasBeenScrolledRecently(false)
|
|
, mCollapsedResizer(false)
|
|
, mWillBuildScrollableLayer(false)
|
|
, mIsScrollableLayerInRootContainer(false)
|
|
, mHasBeenScrolled(false)
|
|
, mIsResolutionSet(false)
|
|
, mIgnoreMomentumScroll(false)
|
|
, mScaleToResolution(false)
|
|
, mTransformingByAPZ(false)
|
|
, mZoomableByAPZ(false)
|
|
, mVelocityQueue(aOuter->PresContext())
|
|
, mAsyncScrollEvent(END_DOM)
|
|
{
|
|
if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
|
|
mScrollbarActivity = new ScrollbarActivity(do_QueryFrame(aOuter));
|
|
}
|
|
|
|
EnsureImageVisPrefsCached();
|
|
|
|
if (IsAlwaysActive() &&
|
|
gfxPrefs::LayersTilesEnabled() &&
|
|
!nsLayoutUtils::UsesAsyncScrolling(mOuter) &&
|
|
mOuter->GetContent()) {
|
|
// If we have tiling but no APZ, then set a 0-margin display port on
|
|
// active scroll containers so that we paint by whole tile increments
|
|
// when scrolling.
|
|
nsLayoutUtils::SetDisplayPortMargins(mOuter->GetContent(),
|
|
mOuter->PresContext()->PresShell(),
|
|
ScreenMargin(),
|
|
0,
|
|
nsLayoutUtils::RepaintMode::DoNotRepaint);
|
|
}
|
|
|
|
}
|
|
|
|
ScrollFrameHelper::~ScrollFrameHelper()
|
|
{
|
|
if (mActivityExpirationState.IsTracked()) {
|
|
gScrollFrameActivityTracker->RemoveObject(this);
|
|
}
|
|
if (gScrollFrameActivityTracker &&
|
|
gScrollFrameActivityTracker->IsEmpty()) {
|
|
delete gScrollFrameActivityTracker;
|
|
gScrollFrameActivityTracker = nullptr;
|
|
}
|
|
|
|
if (mScrollActivityTimer) {
|
|
mScrollActivityTimer->Cancel();
|
|
mScrollActivityTimer = nullptr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Callback function from AsyncSmoothMSDScroll, used in ScrollFrameHelper::ScrollTo
|
|
*/
|
|
void
|
|
ScrollFrameHelper::AsyncSmoothMSDScrollCallback(ScrollFrameHelper* aInstance,
|
|
mozilla::TimeDuration aDeltaTime)
|
|
{
|
|
NS_ASSERTION(aInstance != nullptr, "aInstance must not be null");
|
|
NS_ASSERTION(aInstance->mAsyncSmoothMSDScroll,
|
|
"Did not expect AsyncSmoothMSDScrollCallback without an active MSD scroll.");
|
|
|
|
nsRect range = aInstance->mAsyncSmoothMSDScroll->GetRange();
|
|
aInstance->mAsyncSmoothMSDScroll->Simulate(aDeltaTime);
|
|
|
|
if (!aInstance->mAsyncSmoothMSDScroll->IsFinished()) {
|
|
nsPoint destination = aInstance->mAsyncSmoothMSDScroll->GetPosition();
|
|
// Allow this scroll operation to land on any pixel boundary within the
|
|
// allowed scroll range for this frame.
|
|
// If the MSD is under-dampened or the destination is changed rapidly,
|
|
// it is expected (and desired) that the scrolling may overshoot.
|
|
nsRect intermediateRange =
|
|
nsRect(destination, nsSize()).UnionEdges(range);
|
|
aInstance->ScrollToImpl(destination, intermediateRange);
|
|
// 'aInstance' might be destroyed here
|
|
return;
|
|
}
|
|
|
|
aInstance->CompleteAsyncScroll(range);
|
|
}
|
|
|
|
/*
|
|
* Callback function from AsyncScroll, used in ScrollFrameHelper::ScrollTo
|
|
*/
|
|
void
|
|
ScrollFrameHelper::AsyncScrollCallback(ScrollFrameHelper* aInstance,
|
|
mozilla::TimeStamp aTime)
|
|
{
|
|
MOZ_ASSERT(aInstance != nullptr, "aInstance must not be null");
|
|
MOZ_ASSERT(aInstance->mAsyncScroll,
|
|
"Did not expect AsyncScrollCallback without an active async scroll.");
|
|
|
|
if (!aInstance || !aInstance->mAsyncScroll) {
|
|
return; // XXX wallpaper bug 1107353 for now.
|
|
}
|
|
|
|
nsRect range = aInstance->mAsyncScroll->mRange;
|
|
if (aInstance->mAsyncScroll->mIsSmoothScroll) {
|
|
if (!aInstance->mAsyncScroll->IsFinished(aTime)) {
|
|
nsPoint destination = aInstance->mAsyncScroll->PositionAt(aTime);
|
|
// Allow this scroll operation to land on any pixel boundary between the
|
|
// current position and the final allowed range. (We don't want
|
|
// intermediate steps to be more constrained than the final step!)
|
|
nsRect intermediateRange =
|
|
nsRect(aInstance->GetScrollPosition(), nsSize()).UnionEdges(range);
|
|
aInstance->ScrollToImpl(destination, intermediateRange);
|
|
// 'aInstance' might be destroyed here
|
|
return;
|
|
}
|
|
}
|
|
|
|
aInstance->CompleteAsyncScroll(range);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::CompleteAsyncScroll(const nsRect &aRange, nsIAtom* aOrigin)
|
|
{
|
|
NotifyPluginFrames(END_DOM);
|
|
|
|
// Apply desired destination range since this is the last step of scrolling.
|
|
mAsyncSmoothMSDScroll = nullptr;
|
|
mAsyncScroll = nullptr;
|
|
nsWeakFrame weakFrame(mOuter);
|
|
ScrollToImpl(mDestination, aRange, aOrigin);
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
// We are done scrolling, set our destination to wherever we actually ended
|
|
// up scrolling to.
|
|
mDestination = GetScrollPosition();
|
|
}
|
|
|
|
#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
|
|
static void
|
|
NotifyPluginFramesCallback(nsISupports* aSupports, void* aFlag)
|
|
{
|
|
nsCOMPtr<nsIContent> content = do_QueryInterface(aSupports);
|
|
if (content) {
|
|
nsIFrame *frame = content->GetPrimaryFrame();
|
|
if (frame) {
|
|
nsPluginFrame* plugin = do_QueryFrame(frame);
|
|
if (plugin) {
|
|
plugin->SetScrollVisibility(aFlag != nullptr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ScrollFrameHelper::NotifyPluginFrames(AsyncScrollEventType aEvent)
|
|
{
|
|
#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
|
|
if (!gfxPrefs::HidePluginsForScroll()) {
|
|
return;
|
|
}
|
|
if (XRE_IsContentProcess()) {
|
|
// Ignore 'inner' dom events triggered by apz transformations
|
|
if (mAsyncScrollEvent == BEGIN_APZ && aEvent != END_APZ) {
|
|
return;
|
|
}
|
|
if (aEvent != mAsyncScrollEvent) {
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
bool begin = (aEvent == BEGIN_APZ || aEvent == BEGIN_DOM);
|
|
presContext->Document()->EnumerateActivityObservers(NotifyPluginFramesCallback,
|
|
(void*)begin);
|
|
mAsyncScrollEvent = aEvent;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
|
|
nsIScrollableFrame::ScrollMode aMode)
|
|
{
|
|
nsPoint current = GetScrollPosition();
|
|
CSSIntPoint currentCSSPixels = GetScrollPositionCSSPixels();
|
|
nsPoint pt = CSSPoint::ToAppUnits(aScrollPosition);
|
|
nscoord halfPixel = nsPresContext::CSSPixelsToAppUnits(0.5f);
|
|
nsRect range(pt.x - halfPixel, pt.y - halfPixel, 2*halfPixel - 1, 2*halfPixel - 1);
|
|
// XXX I don't think the following blocks are needed anymore, now that
|
|
// ScrollToImpl simply tries to scroll an integer number of layer
|
|
// pixels from the current position
|
|
if (currentCSSPixels.x == aScrollPosition.x) {
|
|
pt.x = current.x;
|
|
range.x = pt.x;
|
|
range.width = 0;
|
|
}
|
|
if (currentCSSPixels.y == aScrollPosition.y) {
|
|
pt.y = current.y;
|
|
range.y = pt.y;
|
|
range.height = 0;
|
|
}
|
|
ScrollTo(pt, aMode, &range);
|
|
// 'this' might be destroyed here
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollToCSSPixelsApproximate(const CSSPoint& aScrollPosition,
|
|
nsIAtom *aOrigin)
|
|
{
|
|
nsPoint pt = CSSPoint::ToAppUnits(aScrollPosition);
|
|
nscoord halfRange = nsPresContext::CSSPixelsToAppUnits(1000);
|
|
nsRect range(pt.x - halfRange, pt.y - halfRange, 2*halfRange - 1, 2*halfRange - 1);
|
|
ScrollToWithOrigin(pt, nsIScrollableFrame::INSTANT, aOrigin, &range);
|
|
// 'this' might be destroyed here
|
|
}
|
|
|
|
CSSIntPoint
|
|
ScrollFrameHelper::GetScrollPositionCSSPixels()
|
|
{
|
|
return CSSIntPoint::FromAppUnitsRounded(GetScrollPosition());
|
|
}
|
|
|
|
/*
|
|
* this method wraps calls to ScrollToImpl(), either in one shot or incrementally,
|
|
* based on the setting of the smoothness scroll pref
|
|
*/
|
|
void
|
|
ScrollFrameHelper::ScrollToWithOrigin(nsPoint aScrollPosition,
|
|
nsIScrollableFrame::ScrollMode aMode,
|
|
nsIAtom *aOrigin,
|
|
const nsRect* aRange,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
|
|
if (aSnap == nsIScrollableFrame::ENABLE_SNAP) {
|
|
GetSnapPointForDestination(nsIScrollableFrame::DEVICE_PIXELS,
|
|
mDestination,
|
|
aScrollPosition);
|
|
}
|
|
|
|
nsRect scrollRange = GetScrollRangeForClamping();
|
|
mDestination = scrollRange.ClampPoint(aScrollPosition);
|
|
|
|
nsRect range = aRange ? *aRange : nsRect(aScrollPosition, nsSize(0, 0));
|
|
|
|
if (aMode == nsIScrollableFrame::INSTANT) {
|
|
// Asynchronous scrolling is not allowed, so we'll kill any existing
|
|
// async-scrolling process and do an instant scroll.
|
|
CompleteAsyncScroll(range, aOrigin);
|
|
return;
|
|
}
|
|
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
TimeStamp now = presContext->RefreshDriver()->MostRecentRefresh();
|
|
bool isSmoothScroll = (aMode == nsIScrollableFrame::SMOOTH) &&
|
|
IsSmoothScrollingEnabled();
|
|
|
|
nsSize currentVelocity(0, 0);
|
|
|
|
if (gfxPrefs::ScrollBehaviorEnabled()) {
|
|
if (aMode == nsIScrollableFrame::SMOOTH_MSD) {
|
|
mIgnoreMomentumScroll = true;
|
|
if (!mAsyncSmoothMSDScroll) {
|
|
nsPoint sv = mVelocityQueue.GetVelocity();
|
|
currentVelocity.width = sv.x;
|
|
currentVelocity.height = sv.y;
|
|
if (mAsyncScroll) {
|
|
if (mAsyncScroll->mIsSmoothScroll) {
|
|
currentVelocity = mAsyncScroll->VelocityAt(now);
|
|
}
|
|
mAsyncScroll = nullptr;
|
|
}
|
|
|
|
if (nsLayoutUtils::AsyncPanZoomEnabled(mOuter)) {
|
|
// The animation will be handled in the compositor, pass the
|
|
// information needed to start the animation and skip the main-thread
|
|
// animation for this scroll.
|
|
mLastSmoothScrollOrigin = aOrigin;
|
|
mScrollGeneration = ++sScrollGenerationCounter;
|
|
|
|
if (!nsLayoutUtils::GetDisplayPort(mOuter->GetContent())) {
|
|
// If this frame doesn't have a displayport then there won't be an
|
|
// APZC instance for it and so there won't be anything to process
|
|
// this smooth scroll request. We should set a displayport on this
|
|
// frame to force an APZC which can handle the request.
|
|
nsLayoutUtils::CalculateAndSetDisplayPortMargins(
|
|
mOuter->GetScrollTargetFrame(),
|
|
nsLayoutUtils::RepaintMode::DoNotRepaint);
|
|
}
|
|
|
|
// Schedule a paint to ensure that the frame metrics get updated on
|
|
// the compositor thread.
|
|
mOuter->SchedulePaint();
|
|
return;
|
|
}
|
|
|
|
mAsyncSmoothMSDScroll =
|
|
new AsyncSmoothMSDScroll(GetScrollPosition(), mDestination,
|
|
currentVelocity, GetScrollRangeForClamping(),
|
|
now, presContext);
|
|
|
|
if (!mAsyncSmoothMSDScroll->SetRefreshObserver(this)) {
|
|
// Observer setup failed. Scroll the normal way.
|
|
CompleteAsyncScroll(range, aOrigin);
|
|
return;
|
|
}
|
|
} else {
|
|
// A previous smooth MSD scroll is still in progress, so we just need to
|
|
// update its destination.
|
|
mAsyncSmoothMSDScroll->SetDestination(mDestination);
|
|
}
|
|
|
|
return;
|
|
} else {
|
|
if (mAsyncSmoothMSDScroll) {
|
|
currentVelocity = mAsyncSmoothMSDScroll->GetVelocity();
|
|
mAsyncSmoothMSDScroll = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!mAsyncScroll) {
|
|
mAsyncScroll = new AsyncScroll(GetScrollPosition());
|
|
if (!mAsyncScroll->SetRefreshObserver(this)) {
|
|
// Observer setup failed. Scroll the normal way.
|
|
CompleteAsyncScroll(range, aOrigin);
|
|
return;
|
|
}
|
|
}
|
|
|
|
mAsyncScroll->mIsSmoothScroll = isSmoothScroll;
|
|
|
|
if (isSmoothScroll) {
|
|
NotifyPluginFrames(BEGIN_DOM);
|
|
mAsyncScroll->InitSmoothScroll(now, mDestination, aOrigin, range, currentVelocity);
|
|
} else {
|
|
mAsyncScroll->Init(range);
|
|
}
|
|
}
|
|
|
|
// We can't use nsContainerFrame::PositionChildViews here because
|
|
// we don't want to invalidate views that have moved.
|
|
static void AdjustViews(nsIFrame* aFrame)
|
|
{
|
|
nsView* view = aFrame->GetView();
|
|
if (view) {
|
|
nsPoint pt;
|
|
aFrame->GetParent()->GetClosestView(&pt);
|
|
pt += aFrame->GetPosition();
|
|
view->SetPosition(pt.x, pt.y);
|
|
|
|
return;
|
|
}
|
|
|
|
if (!(aFrame->GetStateBits() & NS_FRAME_HAS_CHILD_WITH_VIEW)) {
|
|
return;
|
|
}
|
|
|
|
// Call AdjustViews recursively for all child frames except the popup list as
|
|
// the views for popups are not scrolled.
|
|
nsIFrame::ChildListIterator lists(aFrame);
|
|
for (; !lists.IsDone(); lists.Next()) {
|
|
if (lists.CurrentID() == nsIFrame::kPopupList) {
|
|
continue;
|
|
}
|
|
nsFrameList::Enumerator childFrames(lists.CurrentList());
|
|
for (; !childFrames.AtEnd(); childFrames.Next()) {
|
|
AdjustViews(childFrames.get());
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool
|
|
NeedToInvalidateOnScroll(nsIFrame* aFrame)
|
|
{
|
|
return (aFrame->GetStateBits() & NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL) != 0;
|
|
}
|
|
|
|
bool ScrollFrameHelper::IsIgnoringViewportClipping() const
|
|
{
|
|
if (!mIsRoot)
|
|
return false;
|
|
nsSubDocumentFrame* subdocFrame = static_cast<nsSubDocumentFrame*>
|
|
(nsLayoutUtils::GetCrossDocParentFrame(mOuter->PresContext()->PresShell()->GetRootFrame()));
|
|
return subdocFrame && !subdocFrame->ShouldClipSubdocument();
|
|
}
|
|
|
|
void ScrollFrameHelper::MarkScrollbarsDirtyForReflow() const
|
|
{
|
|
nsIPresShell* presShell = mOuter->PresContext()->PresShell();
|
|
if (mVScrollbarBox) {
|
|
presShell->FrameNeedsReflow(mVScrollbarBox, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
|
|
}
|
|
if (mHScrollbarBox) {
|
|
presShell->FrameNeedsReflow(mHScrollbarBox, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
|
|
}
|
|
}
|
|
|
|
bool ScrollFrameHelper::ShouldClampScrollPosition() const
|
|
{
|
|
if (!mIsRoot)
|
|
return true;
|
|
nsSubDocumentFrame* subdocFrame = static_cast<nsSubDocumentFrame*>
|
|
(nsLayoutUtils::GetCrossDocParentFrame(mOuter->PresContext()->PresShell()->GetRootFrame()));
|
|
return !subdocFrame || subdocFrame->ShouldClampScrollPosition();
|
|
}
|
|
|
|
bool ScrollFrameHelper::IsAlwaysActive() const
|
|
{
|
|
if (nsDisplayItem::ForceActiveLayers()) {
|
|
return true;
|
|
}
|
|
|
|
// Unless this is the root scrollframe for a non-chrome document
|
|
// which is the direct child of a chrome document, we default to not
|
|
// being "active".
|
|
if (!(mIsRoot && mOuter->PresContext()->IsRootContentDocument())) {
|
|
return false;
|
|
}
|
|
|
|
// If we have scrolled before, then we should stay active.
|
|
if (mHasBeenScrolled) {
|
|
return true;
|
|
}
|
|
|
|
// If we're overflow:hidden, then start as inactive until
|
|
// we get scrolled manually.
|
|
ScrollbarStyles styles = GetScrollbarStylesFromFrame();
|
|
return (styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
|
|
styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN);
|
|
}
|
|
|
|
void ScrollFrameHelper::MarkNotRecentlyScrolled()
|
|
{
|
|
if (!mHasBeenScrolledRecently)
|
|
return;
|
|
|
|
mHasBeenScrolledRecently = false;
|
|
mOuter->SchedulePaint();
|
|
}
|
|
|
|
void ScrollFrameHelper::MarkRecentlyScrolled()
|
|
{
|
|
mHasBeenScrolledRecently = true;
|
|
if (IsAlwaysActive())
|
|
return;
|
|
|
|
if (mActivityExpirationState.IsTracked()) {
|
|
gScrollFrameActivityTracker->MarkUsed(this);
|
|
} else {
|
|
if (!gScrollFrameActivityTracker) {
|
|
gScrollFrameActivityTracker = new ScrollFrameActivityTracker();
|
|
}
|
|
gScrollFrameActivityTracker->AddObject(this);
|
|
}
|
|
}
|
|
|
|
void ScrollFrameHelper::ScrollVisual()
|
|
{
|
|
// Mark this frame as having been scrolled. If this is the root
|
|
// scroll frame of a content document, then IsAlwaysActive()
|
|
// will return true from now on and MarkNotRecentlyScrolled() won't
|
|
// have any effect.
|
|
mHasBeenScrolled = true;
|
|
|
|
AdjustViews(mScrolledFrame);
|
|
// We need to call this after fixing up the view positions
|
|
// to be consistent with the frame hierarchy.
|
|
bool needToInvalidateOnScroll = NeedToInvalidateOnScroll(mOuter);
|
|
mOuter->RemoveStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL);
|
|
if (needToInvalidateOnScroll) {
|
|
MarkNotRecentlyScrolled();
|
|
} else {
|
|
MarkRecentlyScrolled();
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Clamp desired scroll position aDesired and range [aDestLower, aDestUpper]
|
|
* to [aBoundLower, aBoundUpper] and then select the appunit value from among
|
|
* aBoundLower, aBoundUpper and those such that (aDesired - aCurrent) *
|
|
* aRes/aAppUnitsPerPixel is an integer (or as close as we can get
|
|
* modulo rounding to appunits) that is in [aDestLower, aDestUpper] and
|
|
* closest to aDesired. If no such value exists, return the nearest in
|
|
* [aDestLower, aDestUpper].
|
|
*/
|
|
static nscoord
|
|
ClampAndAlignWithPixels(nscoord aDesired,
|
|
nscoord aBoundLower, nscoord aBoundUpper,
|
|
nscoord aDestLower, nscoord aDestUpper,
|
|
nscoord aAppUnitsPerPixel, double aRes,
|
|
nscoord aCurrent)
|
|
{
|
|
// Intersect scroll range with allowed range, by clamping the ends
|
|
// of aRange to be within bounds
|
|
nscoord destLower = clamped(aDestLower, aBoundLower, aBoundUpper);
|
|
nscoord destUpper = clamped(aDestUpper, aBoundLower, aBoundUpper);
|
|
|
|
nscoord desired = clamped(aDesired, destLower, destUpper);
|
|
|
|
double currentLayerVal = (aRes*aCurrent)/aAppUnitsPerPixel;
|
|
double desiredLayerVal = (aRes*desired)/aAppUnitsPerPixel;
|
|
double delta = desiredLayerVal - currentLayerVal;
|
|
double nearestLayerVal = NS_round(delta) + currentLayerVal;
|
|
|
|
// Convert back from PaintedLayer space to appunits relative to the top-left
|
|
// of the scrolled frame.
|
|
nscoord aligned =
|
|
NSToCoordRoundWithClamp(nearestLayerVal*aAppUnitsPerPixel/aRes);
|
|
|
|
// Use a bound if it is within the allowed range and closer to desired than
|
|
// the nearest pixel-aligned value.
|
|
if (aBoundUpper == destUpper &&
|
|
static_cast<decltype(Abs(desired))>(aBoundUpper - desired) <
|
|
Abs(desired - aligned))
|
|
return aBoundUpper;
|
|
|
|
if (aBoundLower == destLower &&
|
|
static_cast<decltype(Abs(desired))>(desired - aBoundLower) <
|
|
Abs(aligned - desired))
|
|
return aBoundLower;
|
|
|
|
// Accept the nearest pixel-aligned value if it is within the allowed range.
|
|
if (aligned >= destLower && aligned <= destUpper)
|
|
return aligned;
|
|
|
|
// Check if opposite pixel boundary fits into allowed range.
|
|
double oppositeLayerVal =
|
|
nearestLayerVal + ((nearestLayerVal < desiredLayerVal) ? 1.0 : -1.0);
|
|
nscoord opposite =
|
|
NSToCoordRoundWithClamp(oppositeLayerVal*aAppUnitsPerPixel/aRes);
|
|
if (opposite >= destLower && opposite <= destUpper) {
|
|
return opposite;
|
|
}
|
|
|
|
// No alignment available.
|
|
return desired;
|
|
}
|
|
|
|
/**
|
|
* Clamp desired scroll position aPt to aBounds and then snap
|
|
* it to the same layer pixel edges as aCurrent, keeping it within aRange
|
|
* during snapping. aCurrent is the current scroll position.
|
|
*/
|
|
static nsPoint
|
|
ClampAndAlignWithLayerPixels(const nsPoint& aPt,
|
|
const nsRect& aBounds,
|
|
const nsRect& aRange,
|
|
const nsPoint& aCurrent,
|
|
nscoord aAppUnitsPerPixel,
|
|
const gfxSize& aScale)
|
|
{
|
|
return nsPoint(ClampAndAlignWithPixels(aPt.x, aBounds.x, aBounds.XMost(),
|
|
aRange.x, aRange.XMost(),
|
|
aAppUnitsPerPixel, aScale.width,
|
|
aCurrent.x),
|
|
ClampAndAlignWithPixels(aPt.y, aBounds.y, aBounds.YMost(),
|
|
aRange.y, aRange.YMost(),
|
|
aAppUnitsPerPixel, aScale.height,
|
|
aCurrent.y));
|
|
}
|
|
|
|
/* static */ void
|
|
ScrollFrameHelper::ScrollActivityCallback(nsITimer *aTimer, void* anInstance)
|
|
{
|
|
ScrollFrameHelper* self = static_cast<ScrollFrameHelper*>(anInstance);
|
|
|
|
// Fire the synth mouse move.
|
|
self->mScrollActivityTimer->Cancel();
|
|
self->mScrollActivityTimer = nullptr;
|
|
self->mOuter->PresContext()->PresShell()->SynthesizeMouseMove(true);
|
|
}
|
|
|
|
|
|
void
|
|
ScrollFrameHelper::ScheduleSyntheticMouseMove()
|
|
{
|
|
if (!mScrollActivityTimer) {
|
|
mScrollActivityTimer = do_CreateInstance("@mozilla.org/timer;1");
|
|
if (!mScrollActivityTimer)
|
|
return;
|
|
}
|
|
|
|
mScrollActivityTimer->InitWithFuncCallback(
|
|
ScrollActivityCallback, this, 100, nsITimer::TYPE_ONE_SHOT);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollToImpl(nsPoint aPt, const nsRect& aRange, nsIAtom* aOrigin)
|
|
{
|
|
if (aOrigin == nullptr) {
|
|
// If no origin was specified, we still want to set it to something that's
|
|
// non-null, so that we can use nullness to distinguish if the frame was scrolled
|
|
// at all. Default it to some generic placeholder.
|
|
aOrigin = nsGkAtoms::other;
|
|
}
|
|
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
nscoord appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
|
|
// 'scale' is our estimate of the scale factor that will be applied
|
|
// when rendering the scrolled content to its own PaintedLayer.
|
|
gfxSize scale = FrameLayerBuilder::GetPaintedLayerScaleForFrame(mScrolledFrame);
|
|
nsPoint curPos = GetScrollPosition();
|
|
nsPoint alignWithPos = mScrollPosForLayerPixelAlignment == nsPoint(-1,-1)
|
|
? curPos : mScrollPosForLayerPixelAlignment;
|
|
// Try to align aPt with curPos so they have an integer number of layer
|
|
// pixels between them. This gives us the best chance of scrolling without
|
|
// having to invalidate due to changes in subpixel rendering.
|
|
// Note that when we actually draw into a PaintedLayer, the coordinates
|
|
// that get mapped onto the layer buffer pixels are from the display list,
|
|
// which are relative to the display root frame's top-left increasing down,
|
|
// whereas here our coordinates are scroll positions which increase upward
|
|
// and are relative to the scrollport top-left. This difference doesn't actually
|
|
// matter since all we are about is that there be an integer number of
|
|
// layer pixels between pt and curPos.
|
|
nsPoint pt =
|
|
ClampAndAlignWithLayerPixels(aPt,
|
|
GetScrollRangeForClamping(),
|
|
aRange,
|
|
alignWithPos,
|
|
appUnitsPerDevPixel,
|
|
scale);
|
|
if (pt == curPos) {
|
|
return;
|
|
}
|
|
|
|
bool needImageVisibilityUpdate = (mLastUpdateImagesPos == nsPoint(-1,-1));
|
|
|
|
nsPoint dist(std::abs(pt.x - mLastUpdateImagesPos.x),
|
|
std::abs(pt.y - mLastUpdateImagesPos.y));
|
|
nsSize scrollPortSize = GetScrollPositionClampingScrollPortSize();
|
|
nscoord horzAllowance = std::max(scrollPortSize.width / std::max(sHorzScrollFraction, 1),
|
|
nsPresContext::AppUnitsPerCSSPixel());
|
|
nscoord vertAllowance = std::max(scrollPortSize.height / std::max(sVertScrollFraction, 1),
|
|
nsPresContext::AppUnitsPerCSSPixel());
|
|
if (dist.x >= horzAllowance || dist.y >= vertAllowance) {
|
|
needImageVisibilityUpdate = true;
|
|
}
|
|
|
|
if (needImageVisibilityUpdate) {
|
|
presContext->PresShell()->ScheduleImageVisibilityUpdate();
|
|
}
|
|
|
|
// notify the listeners.
|
|
for (uint32_t i = 0; i < mListeners.Length(); i++) {
|
|
mListeners[i]->ScrollPositionWillChange(pt.x, pt.y);
|
|
}
|
|
|
|
nsRect oldDisplayPort;
|
|
nsLayoutUtils::GetDisplayPort(mOuter->GetContent(), &oldDisplayPort);
|
|
oldDisplayPort.MoveBy(-mScrolledFrame->GetPosition());
|
|
|
|
// Update frame position for scrolling
|
|
mScrolledFrame->SetPosition(mScrollPort.TopLeft() - pt);
|
|
mLastScrollOrigin = aOrigin;
|
|
mLastSmoothScrollOrigin = nullptr;
|
|
mScrollGeneration = ++sScrollGenerationCounter;
|
|
|
|
ScrollVisual();
|
|
|
|
if (LastScrollOrigin() == nsGkAtoms::apz) {
|
|
// If this was an apz scroll and the displayport (relative to the
|
|
// scrolled frame) hasn't changed, then this won't trigger
|
|
// any painting, so no need to schedule one.
|
|
nsRect displayPort;
|
|
DebugOnly<bool> usingDisplayPort =
|
|
nsLayoutUtils::GetDisplayPort(mOuter->GetContent(), &displayPort);
|
|
NS_ASSERTION(usingDisplayPort, "Must have a displayport for apz scrolls!");
|
|
|
|
displayPort.MoveBy(-mScrolledFrame->GetPosition());
|
|
|
|
if (!displayPort.IsEqualEdges(oldDisplayPort)) {
|
|
mOuter->SchedulePaint();
|
|
}
|
|
} else {
|
|
mOuter->SchedulePaint();
|
|
}
|
|
|
|
if (mOuter->ChildrenHavePerspective()) {
|
|
// The overflow areas of descendants may depend on the scroll position,
|
|
// so ensure they get updated.
|
|
mOuter->RecomputePerspectiveChildrenOverflow(mOuter, nullptr);
|
|
}
|
|
|
|
ScheduleSyntheticMouseMove();
|
|
nsWeakFrame weakFrame(mOuter);
|
|
UpdateScrollbarPosition();
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
PostScrollEvent();
|
|
|
|
// notify the listeners.
|
|
for (uint32_t i = 0; i < mListeners.Length(); i++) {
|
|
mListeners[i]->ScrollPositionDidChange(pt.x, pt.y);
|
|
}
|
|
|
|
nsCOMPtr<nsIDocShell> docShell = presContext->GetDocShell();
|
|
if (docShell) {
|
|
docShell->NotifyScrollObservers();
|
|
}
|
|
}
|
|
|
|
static int32_t
|
|
MaxZIndexInList(nsDisplayList* aList, nsDisplayListBuilder* aBuilder)
|
|
{
|
|
int32_t maxZIndex = 0;
|
|
for (nsDisplayItem* item = aList->GetBottom(); item; item = item->GetAbove()) {
|
|
maxZIndex = std::max(maxZIndex, item->ZIndex());
|
|
}
|
|
return maxZIndex;
|
|
}
|
|
|
|
// Finds the max z-index of the items in aList that meet the following conditions
|
|
// 1) have z-index auto or z-index >= 0.
|
|
// 2) aFrame is a proper ancestor of the item's frame.
|
|
// Returns -1 if there is no such item.
|
|
static int32_t
|
|
MaxZIndexInListOfItemsContainedInFrame(nsDisplayList* aList, nsIFrame* aFrame)
|
|
{
|
|
int32_t maxZIndex = -1;
|
|
for (nsDisplayItem* item = aList->GetBottom(); item; item = item->GetAbove()) {
|
|
if (nsLayoutUtils::IsProperAncestorFrame(aFrame, item->Frame())) {
|
|
maxZIndex = std::max(maxZIndex, item->ZIndex());
|
|
}
|
|
}
|
|
return maxZIndex;
|
|
}
|
|
|
|
static const uint32_t APPEND_OWN_LAYER = 0x1;
|
|
static const uint32_t APPEND_POSITIONED = 0x2;
|
|
static const uint32_t APPEND_SCROLLBAR_CONTAINER = 0x4;
|
|
|
|
static void
|
|
AppendToTop(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists,
|
|
nsDisplayList* aSource, nsIFrame* aSourceFrame, uint32_t aFlags)
|
|
{
|
|
if (aSource->IsEmpty())
|
|
return;
|
|
|
|
nsDisplayWrapList* newItem;
|
|
if (aFlags & APPEND_OWN_LAYER) {
|
|
uint32_t flags = (aFlags & APPEND_SCROLLBAR_CONTAINER)
|
|
? nsDisplayOwnLayer::SCROLLBAR_CONTAINER
|
|
: 0;
|
|
newItem = new (aBuilder) nsDisplayOwnLayer(aBuilder, aSourceFrame, aSource, flags);
|
|
} else {
|
|
newItem = new (aBuilder) nsDisplayWrapList(aBuilder, aSourceFrame, aSource);
|
|
}
|
|
|
|
if (aFlags & APPEND_POSITIONED) {
|
|
// We want overlay scrollbars to always be on top of the scrolled content,
|
|
// but we don't want them to unnecessarily cover overlapping elements from
|
|
// outside our scroll frame.
|
|
nsDisplayList* positionedDescendants = aLists.PositionedDescendants();
|
|
if (!positionedDescendants->IsEmpty()) {
|
|
newItem->SetOverrideZIndex(MaxZIndexInList(positionedDescendants, aBuilder));
|
|
positionedDescendants->AppendNewToTop(newItem);
|
|
} else {
|
|
aLists.Outlines()->AppendNewToTop(newItem);
|
|
}
|
|
} else {
|
|
aLists.BorderBackground()->AppendNewToTop(newItem);
|
|
}
|
|
}
|
|
|
|
struct HoveredStateComparator
|
|
{
|
|
bool Equals(nsIFrame* A, nsIFrame* B) const {
|
|
bool aHovered = A->GetContent()->HasAttr(kNameSpaceID_None,
|
|
nsGkAtoms::hover);
|
|
bool bHovered = B->GetContent()->HasAttr(kNameSpaceID_None,
|
|
nsGkAtoms::hover);
|
|
return aHovered == bHovered;
|
|
}
|
|
bool LessThan(nsIFrame* A, nsIFrame* B) const {
|
|
bool aHovered = A->GetContent()->HasAttr(kNameSpaceID_None,
|
|
nsGkAtoms::hover);
|
|
bool bHovered = B->GetContent()->HasAttr(kNameSpaceID_None,
|
|
nsGkAtoms::hover);
|
|
return !aHovered && bHovered;
|
|
}
|
|
};
|
|
|
|
void
|
|
ScrollFrameHelper::AppendScrollPartsTo(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists,
|
|
bool aUsingDisplayPort,
|
|
bool aCreateLayer,
|
|
bool aPositioned)
|
|
{
|
|
nsITheme* theme = mOuter->PresContext()->GetTheme();
|
|
if (theme &&
|
|
theme->ShouldHideScrollbars()) {
|
|
return;
|
|
}
|
|
|
|
bool overlayScrollbars =
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0;
|
|
|
|
nsAutoTArray<nsIFrame*, 3> scrollParts;
|
|
for (nsIFrame* kid : mOuter->PrincipalChildList()) {
|
|
if (kid == mScrolledFrame ||
|
|
(kid->IsAbsPosContaininingBlock() || overlayScrollbars) != aPositioned)
|
|
continue;
|
|
|
|
scrollParts.AppendElement(kid);
|
|
}
|
|
if (scrollParts.IsEmpty()) {
|
|
return;
|
|
}
|
|
|
|
// We can't check will-change budget during display list building phase.
|
|
// This means that we will build scroll bar layers for out of budget
|
|
// will-change: scroll position.
|
|
mozilla::layers::FrameMetrics::ViewID scrollTargetId = IsMaybeScrollingActive()
|
|
? nsLayoutUtils::FindOrCreateIDFor(mScrolledFrame->GetContent())
|
|
: mozilla::layers::FrameMetrics::NULL_SCROLL_ID;
|
|
|
|
scrollParts.Sort(HoveredStateComparator());
|
|
|
|
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
|
|
// Don't let scrollparts extent outside our frame's border-box, if these are
|
|
// viewport scrollbars. They would create layerization problems. This wouldn't
|
|
// normally be an issue but themes can add overflow areas to scrollbar parts.
|
|
if (mIsRoot) {
|
|
clipState.ClipContentDescendants(
|
|
mOuter->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(mOuter));
|
|
}
|
|
|
|
for (uint32_t i = 0; i < scrollParts.Length(); ++i) {
|
|
uint32_t flags = 0;
|
|
uint32_t appendToTopFlags = 0;
|
|
if (scrollParts[i] == mVScrollbarBox) {
|
|
flags |= nsDisplayOwnLayer::VERTICAL_SCROLLBAR;
|
|
appendToTopFlags |= APPEND_SCROLLBAR_CONTAINER;
|
|
}
|
|
if (scrollParts[i] == mHScrollbarBox) {
|
|
flags |= nsDisplayOwnLayer::HORIZONTAL_SCROLLBAR;
|
|
appendToTopFlags |= APPEND_SCROLLBAR_CONTAINER;
|
|
}
|
|
|
|
// The display port doesn't necessarily include the scrollbars, so just
|
|
// include all of the scrollbars if we have a display port.
|
|
nsRect dirty = aUsingDisplayPort ?
|
|
scrollParts[i]->GetVisualOverflowRectRelativeToParent() : aDirtyRect;
|
|
nsDisplayListBuilder::AutoBuildingDisplayList
|
|
buildingForChild(aBuilder, scrollParts[i],
|
|
dirty + mOuter->GetOffsetTo(scrollParts[i]), true);
|
|
nsDisplayListBuilder::AutoCurrentScrollbarInfoSetter
|
|
infoSetter(aBuilder, scrollTargetId, flags);
|
|
nsDisplayListCollection partList;
|
|
mOuter->BuildDisplayListForChild(
|
|
aBuilder, scrollParts[i], dirty, partList,
|
|
nsIFrame::DISPLAY_CHILD_FORCE_STACKING_CONTEXT);
|
|
|
|
// Always create layers for overlay scrollbars so that we don't create a
|
|
// giant layer covering the whole scrollport if both scrollbars are visible.
|
|
bool isOverlayScrollbar = (flags != 0) && overlayScrollbars;
|
|
if (aCreateLayer || isOverlayScrollbar) {
|
|
appendToTopFlags |= APPEND_OWN_LAYER;
|
|
}
|
|
if (aPositioned) {
|
|
appendToTopFlags |= APPEND_POSITIONED;
|
|
}
|
|
|
|
// DISPLAY_CHILD_FORCE_STACKING_CONTEXT put everything into
|
|
// partList.PositionedDescendants().
|
|
::AppendToTop(aBuilder, aLists,
|
|
partList.PositionedDescendants(), scrollParts[i],
|
|
appendToTopFlags);
|
|
}
|
|
}
|
|
|
|
/* static */ bool ScrollFrameHelper::sImageVisPrefsCached = false;
|
|
/* static */ uint32_t ScrollFrameHelper::sHorzExpandScrollPort = 0;
|
|
/* static */ uint32_t ScrollFrameHelper::sVertExpandScrollPort = 1;
|
|
/* static */ int32_t ScrollFrameHelper::sHorzScrollFraction = 2;
|
|
/* static */ int32_t ScrollFrameHelper::sVertScrollFraction = 2;
|
|
|
|
/* static */ void
|
|
ScrollFrameHelper::EnsureImageVisPrefsCached()
|
|
{
|
|
if (!sImageVisPrefsCached) {
|
|
Preferences::AddUintVarCache(&sHorzExpandScrollPort,
|
|
"layout.imagevisibility.numscrollportwidths", (uint32_t)0);
|
|
Preferences::AddUintVarCache(&sVertExpandScrollPort,
|
|
"layout.imagevisibility.numscrollportheights", 1);
|
|
|
|
Preferences::AddIntVarCache(&sHorzScrollFraction,
|
|
"layout.imagevisibility.amountscrollbeforeupdatehorizontal", 2);
|
|
Preferences::AddIntVarCache(&sVertScrollFraction,
|
|
"layout.imagevisibility.amountscrollbeforeupdatevertical", 2);
|
|
|
|
sImageVisPrefsCached = true;
|
|
}
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::ExpandRectToNearlyVisible(const nsRect& aRect) const
|
|
{
|
|
// We don't want to expand a rect in a direction that we can't scroll, so we
|
|
// check the scroll range.
|
|
nsRect scrollRange = GetScrollRangeForClamping();
|
|
nsPoint scrollPos = GetScrollPosition();
|
|
nsMargin expand(0, 0, 0, 0);
|
|
|
|
nscoord vertShift = sVertExpandScrollPort * aRect.height;
|
|
if (scrollRange.y < scrollPos.y) {
|
|
expand.top = vertShift;
|
|
}
|
|
if (scrollPos.y < scrollRange.YMost()) {
|
|
expand.bottom = vertShift;
|
|
}
|
|
|
|
nscoord horzShift = sHorzExpandScrollPort * aRect.width;
|
|
if (scrollRange.x < scrollPos.x) {
|
|
expand.left = horzShift;
|
|
}
|
|
if (scrollPos.x < scrollRange.XMost()) {
|
|
expand.right = horzShift;
|
|
}
|
|
|
|
nsRect rect = aRect;
|
|
rect.Inflate(expand);
|
|
return rect;
|
|
}
|
|
|
|
static bool
|
|
ShouldBeClippedByFrame(nsIFrame* aClipFrame, nsIFrame* aClippedFrame)
|
|
{
|
|
return nsLayoutUtils::IsProperAncestorFrame(aClipFrame, aClippedFrame);
|
|
}
|
|
|
|
static void
|
|
ClipItemsExceptCaret(nsDisplayList* aList,
|
|
nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aClipFrame,
|
|
const DisplayItemClip& aNonCaretClip,
|
|
bool aUsingDisplayPort)
|
|
{
|
|
for (nsDisplayItem* i = aList->GetBottom(); i; i = i->GetAbove()) {
|
|
if (!ShouldBeClippedByFrame(aClipFrame, i->Frame())) {
|
|
continue;
|
|
}
|
|
|
|
bool isCaret = i->GetType() == nsDisplayItem::TYPE_CARET;
|
|
if (aUsingDisplayPort && isCaret) {
|
|
static_cast<nsDisplayCaret*>(i)->SetNeedsCustomScrollClip();
|
|
}
|
|
if (!aUsingDisplayPort && !isCaret) {
|
|
bool unused;
|
|
nsRect bounds = i->GetBounds(aBuilder, &unused);
|
|
if (aNonCaretClip.IsRectAffectedByClip(bounds)) {
|
|
DisplayItemClip newClip;
|
|
newClip.IntersectWith(i->GetClip());
|
|
newClip.IntersectWith(aNonCaretClip);
|
|
i->SetClip(aBuilder, newClip);
|
|
}
|
|
}
|
|
nsDisplayList* children = i->GetSameCoordinateSystemChildren();
|
|
if (children) {
|
|
ClipItemsExceptCaret(children, aBuilder, aClipFrame, aNonCaretClip,
|
|
aUsingDisplayPort);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
ClipListsExceptCaret(nsDisplayListCollection* aLists,
|
|
nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aClipFrame,
|
|
const nsRect& aNonCaretClip,
|
|
bool aUsingDisplayPort)
|
|
{
|
|
DisplayItemClip clip;
|
|
clip.SetTo(aNonCaretClip);
|
|
ClipItemsExceptCaret(aLists->BorderBackground(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
ClipItemsExceptCaret(aLists->BlockBorderBackgrounds(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
ClipItemsExceptCaret(aLists->Floats(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
ClipItemsExceptCaret(aLists->PositionedDescendants(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
ClipItemsExceptCaret(aLists->Outlines(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
ClipItemsExceptCaret(aLists->Content(), aBuilder, aClipFrame, clip, aUsingDisplayPort);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsRect& aDirtyRect,
|
|
const nsDisplayListSet& aLists)
|
|
{
|
|
if (aBuilder->IsForImageVisibility()) {
|
|
mLastUpdateImagesPos = GetScrollPosition();
|
|
}
|
|
|
|
mOuter->DisplayBorderBackgroundOutline(aBuilder, aLists);
|
|
|
|
if (aBuilder->IsPaintingToWindow()) {
|
|
mScrollPosAtLastPaint = GetScrollPosition();
|
|
if (IsMaybeScrollingActive() && NeedToInvalidateOnScroll(mOuter)) {
|
|
MarkNotRecentlyScrolled();
|
|
}
|
|
if (IsMaybeScrollingActive()) {
|
|
if (mScrollPosForLayerPixelAlignment == nsPoint(-1,-1)) {
|
|
mScrollPosForLayerPixelAlignment = mScrollPosAtLastPaint;
|
|
}
|
|
} else {
|
|
mScrollPosForLayerPixelAlignment = nsPoint(-1,-1);
|
|
}
|
|
}
|
|
|
|
// Clear the scroll port clip that was set during the last paint.
|
|
mAncestorClip = Nothing();
|
|
mAncestorClipForCaret = Nothing();
|
|
|
|
// We put non-overlay scrollbars in their own layers when this is the root
|
|
// scroll frame and we are a toplevel content document. In this situation,
|
|
// the scrollbar(s) would normally be assigned their own layer anyway, since
|
|
// they're not scrolled with the rest of the document. But when both
|
|
// scrollbars are visible, the layer's visible rectangle would be the size
|
|
// of the viewport, so most layer implementations would create a layer buffer
|
|
// that's much larger than necessary. Creating independent layers for each
|
|
// scrollbar works around the problem.
|
|
bool createLayersForScrollbars = mIsRoot &&
|
|
mOuter->PresContext()->IsRootContentDocument();
|
|
|
|
if (aBuilder->GetIgnoreScrollFrame() == mOuter || IsIgnoringViewportClipping()) {
|
|
bool usingDisplayPort = aBuilder->IsPaintingToWindow() &&
|
|
nsLayoutUtils::GetDisplayPort(mOuter->GetContent());
|
|
|
|
// Root scrollframes have FrameMetrics and clipping on their container
|
|
// layers, so don't apply clipping again.
|
|
mAddClipRectToLayer = false;
|
|
|
|
// If we are a root scroll frame that has a display port we want to add
|
|
// scrollbars, they will be children of the scrollable layer, but they get
|
|
// adjusted by the APZC automatically.
|
|
bool addScrollBars = mIsRoot && usingDisplayPort && !aBuilder->IsForEventDelivery();
|
|
|
|
if (addScrollBars) {
|
|
// Add classic scrollbars.
|
|
AppendScrollPartsTo(aBuilder, aDirtyRect, aLists, usingDisplayPort,
|
|
createLayersForScrollbars, false);
|
|
}
|
|
|
|
// Don't clip the scrolled child, and don't paint scrollbars/scrollcorner.
|
|
// The scrolled frame shouldn't have its own background/border, so we
|
|
// can just pass aLists directly.
|
|
mOuter->BuildDisplayListForChild(aBuilder, mScrolledFrame,
|
|
aDirtyRect, aLists);
|
|
|
|
if (addScrollBars) {
|
|
// Add overlay scrollbars.
|
|
AppendScrollPartsTo(aBuilder, aDirtyRect, aLists, usingDisplayPort,
|
|
createLayersForScrollbars, true);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// Root scrollframes have FrameMetrics and clipping on their container
|
|
// layers, so don't apply clipping again.
|
|
mAddClipRectToLayer =
|
|
!(mIsRoot && mOuter->PresContext()->PresShell()->GetIsViewportOverridden());
|
|
|
|
// Overflow clipping can never clip frames outside our subtree, so there
|
|
// is no need to worry about whether we are a moving frame that might clip
|
|
// non-moving frames.
|
|
// Not all our descendants will be clipped by overflow clipping, but all
|
|
// the ones that aren't clipped will be out of flow frames that have already
|
|
// had dirty rects saved for them by their parent frames calling
|
|
// MarkOutOfFlowChildrenForDisplayList, so it's safe to restrict our
|
|
// dirty rect here.
|
|
nsRect dirtyRect = aDirtyRect.Intersect(mScrollPort);
|
|
|
|
unused << DecideScrollableLayer(aBuilder, &dirtyRect,
|
|
/* aAllowCreateDisplayPort = */ !mIsRoot);
|
|
|
|
bool usingDisplayPort = aBuilder->IsPaintingToWindow() &&
|
|
nsLayoutUtils::GetDisplayPort(mOuter->GetContent());
|
|
|
|
// Whether we might want to build a scrollable layer for this scroll frame
|
|
// at some point in the future. This controls whether we add the information
|
|
// to the layer tree (a scroll info layer if necessary, and add the right
|
|
// area to the dispatch to content layer event regions) necessary to activate
|
|
// a scroll frame so it creates a scrollable layer.
|
|
bool couldBuildLayer = false;
|
|
if (mWillBuildScrollableLayer) {
|
|
couldBuildLayer = true;
|
|
} else {
|
|
couldBuildLayer =
|
|
nsLayoutUtils::AsyncPanZoomEnabled(mOuter) &&
|
|
WantAsyncScroll() &&
|
|
// If we are using containers for root frames, and we are the root
|
|
// scroll frame for the display root, then we don't need a scroll
|
|
// info layer. nsDisplayList::PaintForFrame already calls
|
|
// ComputeFrameMetrics for us.
|
|
(!(gfxPrefs::LayoutUseContainersForRootFrames() && mIsRoot) ||
|
|
(aBuilder->RootReferenceFrame()->PresContext() != mOuter->PresContext()));
|
|
}
|
|
|
|
// Now display the scrollbars and scrollcorner. These parts are drawn
|
|
// in the border-background layer, on top of our own background and
|
|
// borders and underneath borders and backgrounds of later elements
|
|
// in the tree.
|
|
// Note that this does not apply for overlay scrollbars; those are drawn
|
|
// in the positioned-elements layer on top of everything else by the call
|
|
// to AppendScrollPartsTo(..., true) further down.
|
|
AppendScrollPartsTo(aBuilder, aDirtyRect, aLists, usingDisplayPort,
|
|
createLayersForScrollbars, false);
|
|
|
|
if (aBuilder->IsForImageVisibility()) {
|
|
// We expand the dirty rect to catch images just outside of the scroll port.
|
|
// We use the dirty rect instead of the whole scroll port to prevent
|
|
// too much expansion in the presence of very large (bigger than the
|
|
// viewport) scroll ports.
|
|
dirtyRect = ExpandRectToNearlyVisible(dirtyRect);
|
|
}
|
|
|
|
const nsStyleDisplay* disp = mOuter->StyleDisplay();
|
|
if (disp && (disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_SCROLL)) {
|
|
aBuilder->AddToWillChangeBudget(mOuter, GetScrollPositionClampingScrollPortSize());
|
|
}
|
|
|
|
mScrollParentID = aBuilder->GetCurrentScrollParentId();
|
|
|
|
Maybe<nsRect> contentBoxClipForCaret;
|
|
Maybe<nsRect> contentBoxClipForNonCaretContent;
|
|
if (MOZ_UNLIKELY(mOuter->StyleDisplay()->mOverflowClipBox ==
|
|
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX)) {
|
|
// We only clip if there is *scrollable* overflow, to avoid clipping
|
|
// *visual* overflow unnecessarily.
|
|
nsRect clipRect = mScrollPort + aBuilder->ToReferenceFrame(mOuter);
|
|
nsRect so = mScrolledFrame->GetScrollableOverflowRect();
|
|
if (clipRect.width != so.width || clipRect.height != so.height ||
|
|
so.x < 0 || so.y < 0) {
|
|
clipRect.Deflate(mOuter->GetUsedPadding());
|
|
contentBoxClipForNonCaretContent = Some(clipRect);
|
|
if (nsIFrame* caretFrame = aBuilder->GetCaretFrame()) {
|
|
// Avoid clipping it in a zero-height line box (heuristic only).
|
|
if (caretFrame->GetRect().height != 0) {
|
|
nsRect caretRect = aBuilder->GetCaretRect();
|
|
// Allow the caret to stick out of the content box clip by half the
|
|
// caret height on the top, and its full width on the right.
|
|
clipRect.Inflate(nsMargin(caretRect.height / 2, caretRect.width, 0, 0));
|
|
contentBoxClipForCaret = Some(clipRect);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
nsDisplayListCollection scrolledContent;
|
|
{
|
|
// Note that setting the current scroll parent id here means that positioned children
|
|
// of this scroll info layer will pick up the scroll info layer as their scroll handoff
|
|
// parent. This is intentional because that is what happens for positioned children
|
|
// of scroll layers, and we want to maintain consistent behaviour between scroll layers
|
|
// and scroll info layers.
|
|
nsDisplayListBuilder::AutoCurrentScrollParentIdSetter idSetter(
|
|
aBuilder,
|
|
couldBuildLayer && mScrolledFrame->GetContent()
|
|
? nsLayoutUtils::FindOrCreateIDFor(mScrolledFrame->GetContent())
|
|
: aBuilder->GetCurrentScrollParentId());
|
|
|
|
// We need to apply at least one clip, potentially more, and each needs to be applied
|
|
// through a separate DisplayListClipState::AutoSaveRestore object.
|
|
// clipStatePtr will always point to the innermost used one.
|
|
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
|
|
DisplayListClipState::AutoSaveRestore* clipStatePtr = &clipState;
|
|
if (!mIsRoot || !usingDisplayPort) {
|
|
nsRect clip = mScrollPort + aBuilder->ToReferenceFrame(mOuter);
|
|
nscoord radii[8];
|
|
bool haveRadii = mOuter->GetPaddingBoxBorderRadii(radii);
|
|
// Our override of GetBorderRadii ensures we never have a radius at
|
|
// the corners where we have a scrollbar.
|
|
if (mClipAllDescendants) {
|
|
clipState.ClipContentDescendants(clip, haveRadii ? radii : nullptr);
|
|
} else {
|
|
clipState.ClipContainingBlockDescendants(clip, haveRadii ? radii : nullptr);
|
|
}
|
|
}
|
|
|
|
Maybe<DisplayListClipState::AutoSaveRestore> clipStateCaret;
|
|
if (contentBoxClipForCaret) {
|
|
clipStateCaret.emplace(aBuilder);
|
|
clipStatePtr = &*clipStateCaret;
|
|
if (mClipAllDescendants) {
|
|
clipStateCaret->ClipContentDescendants(*contentBoxClipForCaret);
|
|
} else {
|
|
clipStateCaret->ClipContainingBlockDescendants(*contentBoxClipForCaret);
|
|
}
|
|
}
|
|
|
|
Maybe<DisplayListClipState::AutoSaveRestore> clipStateNonCaret;
|
|
if (usingDisplayPort) {
|
|
// Capture the clip state of the parent scroll frame. This will be saved
|
|
// on FrameMetrics for layers with this frame as their animated geoemetry
|
|
// root.
|
|
mAncestorClipForCaret = ToMaybe(aBuilder->ClipState().GetCurrentCombinedClip(aBuilder));
|
|
|
|
// Add the non-caret content box clip here so that it gets picked up by
|
|
// mAncestorClip.
|
|
if (contentBoxClipForNonCaretContent) {
|
|
clipStateNonCaret.emplace(aBuilder);
|
|
clipStatePtr = &*clipStateNonCaret;
|
|
if (mClipAllDescendants) {
|
|
clipStateNonCaret->ClipContentDescendants(*contentBoxClipForNonCaretContent);
|
|
} else {
|
|
clipStateNonCaret->ClipContainingBlockDescendants(*contentBoxClipForNonCaretContent);
|
|
}
|
|
}
|
|
mAncestorClip = ToMaybe(aBuilder->ClipState().GetCurrentCombinedClip(aBuilder));
|
|
|
|
// If we are using a display port, then ignore any pre-existing clip
|
|
// passed down from our parents. The pre-existing clip would just defeat
|
|
// the purpose of a display port which is to paint regions that are not
|
|
// currently visible so that they can be brought into view asynchronously.
|
|
// Notes:
|
|
// - The pre-existing clip state will be restored when the
|
|
// AutoSaveRestore goes out of scope, so there is no permanent change
|
|
// to this clip state.
|
|
// - We still set a clip to the scroll port further below where we
|
|
// build the scroll wrapper. This doesn't prevent us from painting
|
|
// the entire displayport, but it lets the compositor know to
|
|
// clip to the scroll port after compositing.
|
|
clipStatePtr->Clear();
|
|
}
|
|
|
|
aBuilder->StoreDirtyRectForScrolledContents(mOuter, dirtyRect);
|
|
mOuter->BuildDisplayListForChild(aBuilder, mScrolledFrame, dirtyRect, scrolledContent);
|
|
|
|
if (idSetter.ShouldForceLayerForScrollParent() &&
|
|
!gfxPrefs::LayoutUseContainersForRootFrames())
|
|
{
|
|
// Note that forcing layerization of scroll parents follows the scroll
|
|
// handoff chain which is subject to the out-of-flow-frames caveat noted
|
|
// above (where the idSetter variable is created).
|
|
//
|
|
// This is not compatible when using containes for root scrollframes.
|
|
MOZ_ASSERT(couldBuildLayer && mScrolledFrame->GetContent());
|
|
mWillBuildScrollableLayer = true;
|
|
}
|
|
}
|
|
|
|
if (mWillBuildScrollableLayer && !gfxPrefs::LayoutUseContainersForRootFrames()) {
|
|
aBuilder->ForceLayerForScrollParent();
|
|
}
|
|
|
|
if (contentBoxClipForNonCaretContent) {
|
|
ClipListsExceptCaret(&scrolledContent, aBuilder, mScrolledFrame,
|
|
*contentBoxClipForNonCaretContent, usingDisplayPort);
|
|
}
|
|
|
|
if (couldBuildLayer) {
|
|
// Make sure that APZ will dispatch events back to content so we can create
|
|
// a displayport for this frame. We'll add the item later on.
|
|
nsDisplayLayerEventRegions* inactiveRegionItem = nullptr;
|
|
if (aBuilder->IsPaintingToWindow() &&
|
|
!mWillBuildScrollableLayer &&
|
|
aBuilder->IsBuildingLayerEventRegions())
|
|
{
|
|
inactiveRegionItem = new (aBuilder) nsDisplayLayerEventRegions(aBuilder, mScrolledFrame);
|
|
inactiveRegionItem->AddInactiveScrollPort(mScrollPort + aBuilder->ToReferenceFrame(mOuter));
|
|
}
|
|
|
|
if (inactiveRegionItem) {
|
|
nsDisplayList* positionedDescendants = scrolledContent.PositionedDescendants();
|
|
nsDisplayList* destinationList = nullptr;
|
|
int32_t zindex =
|
|
MaxZIndexInListOfItemsContainedInFrame(positionedDescendants, mOuter);
|
|
if (zindex >= 0) {
|
|
destinationList = positionedDescendants;
|
|
} else {
|
|
destinationList = scrolledContent.Outlines();
|
|
}
|
|
destinationList->AppendNewToTop(inactiveRegionItem);
|
|
}
|
|
|
|
if (aBuilder->ShouldBuildScrollInfoItemsForHoisting()) {
|
|
aBuilder->AppendNewScrollInfoItemForHoisting(
|
|
new (aBuilder) nsDisplayScrollInfoLayer(aBuilder, mScrolledFrame,
|
|
mOuter));
|
|
}
|
|
}
|
|
// Now display overlay scrollbars and the resizer, if we have one.
|
|
AppendScrollPartsTo(aBuilder, aDirtyRect, scrolledContent, usingDisplayPort,
|
|
createLayersForScrollbars, true);
|
|
scrolledContent.MoveTo(aLists);
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
|
|
nsRect* aDirtyRect,
|
|
bool aAllowCreateDisplayPort)
|
|
{
|
|
bool usingDisplayPort = false;
|
|
nsIContent* content = mOuter->GetContent();
|
|
if (aBuilder->IsPaintingToWindow()) {
|
|
bool wasUsingDisplayPort = nsLayoutUtils::GetDisplayPort(content);
|
|
|
|
nsRect displayportBase = *aDirtyRect;
|
|
nsPresContext* pc = mOuter->PresContext();
|
|
if (mIsRoot && (pc->IsRootContentDocument() || !pc->GetParentPresContext())) {
|
|
displayportBase =
|
|
nsRect(nsPoint(0, 0), nsLayoutUtils::CalculateCompositionSizeForFrame(mOuter));
|
|
}
|
|
|
|
nsRect displayPort;
|
|
if (aAllowCreateDisplayPort) {
|
|
// Provide the value of the display port base rect, and possibly create a
|
|
// display port if there isn't one already.
|
|
usingDisplayPort = nsLayoutUtils::GetOrMaybeCreateDisplayPort(
|
|
*aBuilder, mOuter, displayportBase, &displayPort);
|
|
} else {
|
|
// We should have already been called with aAllowCreateDisplayPort == true
|
|
// which should have set a displayport base.
|
|
MOZ_ASSERT(content->GetProperty(nsGkAtoms::DisplayPortBase));
|
|
usingDisplayPort = nsLayoutUtils::GetDisplayPort(content, &displayPort);
|
|
}
|
|
|
|
// Override the dirty rectangle if the displayport has been set.
|
|
if (usingDisplayPort) {
|
|
*aDirtyRect = displayPort;
|
|
|
|
// The cached animated geometry root for the display builder is out of
|
|
// date if we just introduced a new animated geometry root.
|
|
if (!wasUsingDisplayPort) {
|
|
aBuilder->RecomputeCurrentAnimatedGeometryRoot();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Since making new layers is expensive, only create a scrollable layer
|
|
// for some scroll frames.
|
|
// When a displayport is being used, force building of a layer so that
|
|
// the compositor can find the scrollable layer for async scrolling.
|
|
// If the element is marked 'scrollgrab', also force building of a layer
|
|
// so that APZ can implement scroll grabbing.
|
|
mWillBuildScrollableLayer = usingDisplayPort || nsContentUtils::HasScrollgrab(content);
|
|
|
|
if (gfxPrefs::LayoutUseContainersForRootFrames() && mWillBuildScrollableLayer && mIsRoot) {
|
|
mIsScrollableLayerInRootContainer = true;
|
|
}
|
|
|
|
return mWillBuildScrollableLayer;
|
|
}
|
|
|
|
|
|
Maybe<DisplayItemClip>
|
|
ScrollFrameHelper::ComputeScrollClip(bool aIsForCaret) const
|
|
{
|
|
const Maybe<DisplayItemClip>& ancestorClip = aIsForCaret ? mAncestorClipForCaret : mAncestorClip;
|
|
if (!mWillBuildScrollableLayer || mIsScrollableLayerInRootContainer) {
|
|
return Nothing();
|
|
}
|
|
|
|
return ancestorClip;
|
|
}
|
|
|
|
Maybe<FrameMetricsAndClip>
|
|
ScrollFrameHelper::ComputeFrameMetrics(Layer* aLayer,
|
|
nsIFrame* aContainerReferenceFrame,
|
|
const ContainerLayerParameters& aParameters,
|
|
bool aIsForCaret) const
|
|
{
|
|
if (!mWillBuildScrollableLayer || mIsScrollableLayerInRootContainer) {
|
|
return Nothing();
|
|
}
|
|
|
|
bool needsParentLayerClip = true;
|
|
if (gfxPrefs::LayoutUseContainersForRootFrames() && !mAddClipRectToLayer) {
|
|
// For containerful frames, the clip is on the container frame.
|
|
needsParentLayerClip = false;
|
|
}
|
|
|
|
const Maybe<DisplayItemClip>& ancestorClip = aIsForCaret ? mAncestorClipForCaret : mAncestorClip;
|
|
|
|
nsPoint toReferenceFrame = mOuter->GetOffsetToCrossDoc(aContainerReferenceFrame);
|
|
bool isRootContent = mIsRoot && mOuter->PresContext()->IsRootContentDocument();
|
|
|
|
Maybe<nsRect> parentLayerClip;
|
|
if (needsParentLayerClip) {
|
|
nsRect clip = nsRect(mScrollPort.TopLeft() + toReferenceFrame,
|
|
nsLayoutUtils::CalculateCompositionSizeForFrame(mOuter));
|
|
if (isRootContent) {
|
|
double res = mOuter->PresContext()->PresShell()->GetResolution();
|
|
clip.width = NSToCoordRound(clip.width / res);
|
|
clip.height = NSToCoordRound(clip.height / res);
|
|
}
|
|
|
|
if (ancestorClip && ancestorClip->HasClip()) {
|
|
clip = ancestorClip->GetClipRect().Intersect(clip);
|
|
}
|
|
|
|
parentLayerClip = Some(clip);
|
|
}
|
|
|
|
bool thisScrollFrameUsesAsyncScrolling = nsLayoutUtils::UsesAsyncScrolling(mOuter);
|
|
#if defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ)
|
|
// Android without apzc (aka the java pan zoom code) only uses async scrolling
|
|
// for the root scroll frame of the root content document.
|
|
if (!isRootContent) {
|
|
thisScrollFrameUsesAsyncScrolling = false;
|
|
}
|
|
#endif
|
|
if (!thisScrollFrameUsesAsyncScrolling) {
|
|
if (parentLayerClip) {
|
|
// If APZ is not enabled, we still need the displayport to be clipped
|
|
// in the compositor.
|
|
ParentLayerIntRect displayportClip =
|
|
ViewAs<ParentLayerPixel>(
|
|
parentLayerClip->ScaleToNearestPixels(
|
|
aParameters.mXScale,
|
|
aParameters.mYScale,
|
|
mScrolledFrame->PresContext()->AppUnitsPerDevPixel()));
|
|
|
|
ParentLayerIntRect layerClip;
|
|
if (const ParentLayerIntRect* origClip = aLayer->GetClipRect().ptrOr(nullptr)) {
|
|
layerClip = displayportClip.Intersect(*origClip);
|
|
} else {
|
|
layerClip = displayportClip;
|
|
}
|
|
aLayer->SetClipRect(Some(layerClip));
|
|
}
|
|
|
|
// Return early, since if we don't use APZ we don't need FrameMetrics.
|
|
return Nothing();
|
|
}
|
|
|
|
MOZ_ASSERT(mScrolledFrame->GetContent());
|
|
|
|
FrameMetricsAndClip result;
|
|
|
|
nsRect scrollport = mScrollPort + toReferenceFrame;
|
|
result.metrics = nsLayoutUtils::ComputeFrameMetrics(
|
|
mScrolledFrame, mOuter, mOuter->GetContent(),
|
|
aContainerReferenceFrame, aLayer, mScrollParentID,
|
|
scrollport, parentLayerClip, isRootContent, aParameters);
|
|
result.clip = ancestorClip;
|
|
|
|
return Some(result);
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsRectNearlyVisible(const nsRect& aRect) const
|
|
{
|
|
// Use the right rect depending on if a display port is set.
|
|
nsRect displayPort;
|
|
bool usingDisplayport = nsLayoutUtils::GetDisplayPort(mOuter->GetContent(), &displayPort);
|
|
return aRect.Intersects(ExpandRectToNearlyVisible(usingDisplayport ? displayPort : mScrollPort));
|
|
}
|
|
|
|
static void HandleScrollPref(nsIScrollable *aScrollable, int32_t aOrientation,
|
|
uint8_t& aValue)
|
|
{
|
|
int32_t pref;
|
|
aScrollable->GetDefaultScrollbarPreferences(aOrientation, &pref);
|
|
switch (pref) {
|
|
case nsIScrollable::Scrollbar_Auto:
|
|
// leave |aValue| untouched
|
|
break;
|
|
case nsIScrollable::Scrollbar_Never:
|
|
aValue = NS_STYLE_OVERFLOW_HIDDEN;
|
|
break;
|
|
case nsIScrollable::Scrollbar_Always:
|
|
aValue = NS_STYLE_OVERFLOW_SCROLL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ScrollbarStyles
|
|
ScrollFrameHelper::GetScrollbarStylesFromFrame() const
|
|
{
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
if (!presContext->IsDynamic() &&
|
|
!(mIsRoot && presContext->HasPaginatedScrolling())) {
|
|
return ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN, NS_STYLE_OVERFLOW_HIDDEN);
|
|
}
|
|
|
|
if (!mIsRoot) {
|
|
const nsStyleDisplay* disp = mOuter->StyleDisplay();
|
|
return ScrollbarStyles(disp);
|
|
}
|
|
|
|
ScrollbarStyles result = presContext->GetViewportScrollbarStylesOverride();
|
|
nsCOMPtr<nsISupports> container = presContext->GetContainerWeak();
|
|
nsCOMPtr<nsIScrollable> scrollable = do_QueryInterface(container);
|
|
if (scrollable) {
|
|
HandleScrollPref(scrollable, nsIScrollable::ScrollOrientation_X,
|
|
result.mHorizontal);
|
|
HandleScrollPref(scrollable, nsIScrollable::ScrollOrientation_Y,
|
|
result.mVertical);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::GetScrollRange() const
|
|
{
|
|
return GetScrollRange(mScrollPort.width, mScrollPort.height);
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::GetScrollRange(nscoord aWidth, nscoord aHeight) const
|
|
{
|
|
nsRect range = GetScrolledRect();
|
|
range.width = std::max(range.width - aWidth, 0);
|
|
range.height = std::max(range.height - aHeight, 0);
|
|
return range;
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::GetScrollRangeForClamping() const
|
|
{
|
|
if (!ShouldClampScrollPosition()) {
|
|
return nsRect(nscoord_MIN/2, nscoord_MIN/2,
|
|
nscoord_MAX - nscoord_MIN/2, nscoord_MAX - nscoord_MIN/2);
|
|
}
|
|
nsSize scrollPortSize = GetScrollPositionClampingScrollPortSize();
|
|
return GetScrollRange(scrollPortSize.width, scrollPortSize.height);
|
|
}
|
|
|
|
nsSize
|
|
ScrollFrameHelper::GetScrollPositionClampingScrollPortSize() const
|
|
{
|
|
nsIPresShell* presShell = mOuter->PresContext()->PresShell();
|
|
if (mIsRoot && presShell->IsScrollPositionClampingScrollPortSizeSet()) {
|
|
return presShell->GetScrollPositionClampingScrollPortSize();
|
|
}
|
|
return mScrollPort.Size();
|
|
}
|
|
|
|
float
|
|
ScrollFrameHelper::GetResolution() const
|
|
{
|
|
return mResolution;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::SetResolution(float aResolution)
|
|
{
|
|
mResolution = aResolution;
|
|
mIsResolutionSet = true;
|
|
mScaleToResolution = false;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::SetResolutionAndScaleTo(float aResolution)
|
|
{
|
|
MOZ_ASSERT(mIsRoot); // This API should only be called on root scroll frames.
|
|
mResolution = aResolution;
|
|
mIsResolutionSet = true;
|
|
mScaleToResolution = true;
|
|
}
|
|
|
|
static void
|
|
AdjustForWholeDelta(int32_t aDelta, nscoord* aCoord)
|
|
{
|
|
if (aDelta < 0) {
|
|
*aCoord = nscoord_MIN;
|
|
} else if (aDelta > 0) {
|
|
*aCoord = nscoord_MAX;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculate lower/upper scrollBy range in given direction.
|
|
* @param aDelta specifies scrollBy direction, if 0 then range will be 0 size
|
|
* @param aPos desired destination in AppUnits
|
|
* @param aNeg/PosTolerance defines relative range distance
|
|
* below and above of aPos point
|
|
* @param aMultiplier used for conversion of tolerance into appUnis
|
|
*/
|
|
static void
|
|
CalcRangeForScrollBy(int32_t aDelta, nscoord aPos,
|
|
float aNegTolerance,
|
|
float aPosTolerance,
|
|
nscoord aMultiplier,
|
|
nscoord* aLower, nscoord* aUpper)
|
|
{
|
|
if (!aDelta) {
|
|
*aLower = *aUpper = aPos;
|
|
return;
|
|
}
|
|
*aLower = aPos - NSToCoordRound(aMultiplier * (aDelta > 0 ? aNegTolerance : aPosTolerance));
|
|
*aUpper = aPos + NSToCoordRound(aMultiplier * (aDelta > 0 ? aPosTolerance : aNegTolerance));
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollBy(nsIntPoint aDelta,
|
|
nsIScrollableFrame::ScrollUnit aUnit,
|
|
nsIScrollableFrame::ScrollMode aMode,
|
|
nsIntPoint* aOverflow,
|
|
nsIAtom *aOrigin,
|
|
nsIScrollableFrame::ScrollMomentum aMomentum,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap)
|
|
{
|
|
// When a smooth scroll is being processed on a frame, mouse wheel and trackpad
|
|
// momentum scroll event updates must notcancel the SMOOTH or SMOOTH_MSD
|
|
// scroll animations, enabling Javascript that depends on them to be responsive
|
|
// without forcing the user to wait for the fling animations to completely stop.
|
|
switch (aMomentum) {
|
|
case nsIScrollableFrame::NOT_MOMENTUM:
|
|
mIgnoreMomentumScroll = false;
|
|
break;
|
|
case nsIScrollableFrame::SYNTHESIZED_MOMENTUM_EVENT:
|
|
if (mIgnoreMomentumScroll) {
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (mAsyncSmoothMSDScroll != nullptr) {
|
|
// When CSSOM-View scroll-behavior smooth scrolling is interrupted,
|
|
// the scroll is not completed to avoid non-smooth snapping to the
|
|
// prior smooth scroll's destination.
|
|
mDestination = GetScrollPosition();
|
|
}
|
|
|
|
nsSize deltaMultiplier;
|
|
float negativeTolerance;
|
|
float positiveTolerance;
|
|
if (!aOrigin){
|
|
aOrigin = nsGkAtoms::other;
|
|
}
|
|
bool isGenericOrigin = (aOrigin == nsGkAtoms::other);
|
|
switch (aUnit) {
|
|
case nsIScrollableFrame::DEVICE_PIXELS: {
|
|
nscoord appUnitsPerDevPixel =
|
|
mOuter->PresContext()->AppUnitsPerDevPixel();
|
|
deltaMultiplier = nsSize(appUnitsPerDevPixel, appUnitsPerDevPixel);
|
|
if (isGenericOrigin){
|
|
aOrigin = nsGkAtoms::pixels;
|
|
}
|
|
negativeTolerance = positiveTolerance = 0.5f;
|
|
break;
|
|
}
|
|
case nsIScrollableFrame::LINES: {
|
|
deltaMultiplier = GetLineScrollAmount();
|
|
if (isGenericOrigin){
|
|
aOrigin = nsGkAtoms::lines;
|
|
}
|
|
negativeTolerance = positiveTolerance = 0.1f;
|
|
break;
|
|
}
|
|
case nsIScrollableFrame::PAGES: {
|
|
deltaMultiplier = GetPageScrollAmount();
|
|
if (isGenericOrigin){
|
|
aOrigin = nsGkAtoms::pages;
|
|
}
|
|
negativeTolerance = 0.05f;
|
|
positiveTolerance = 0;
|
|
break;
|
|
}
|
|
case nsIScrollableFrame::WHOLE: {
|
|
nsPoint pos = GetScrollPosition();
|
|
AdjustForWholeDelta(aDelta.x, &pos.x);
|
|
AdjustForWholeDelta(aDelta.y, &pos.y);
|
|
if (aSnap == nsIScrollableFrame::ENABLE_SNAP) {
|
|
GetSnapPointForDestination(aUnit, mDestination, pos);
|
|
}
|
|
ScrollTo(pos, aMode);
|
|
// 'this' might be destroyed here
|
|
if (aOverflow) {
|
|
*aOverflow = nsIntPoint(0, 0);
|
|
}
|
|
return;
|
|
}
|
|
default:
|
|
NS_ERROR("Invalid scroll mode");
|
|
return;
|
|
}
|
|
|
|
nsPoint newPos = mDestination + nsPoint(aDelta.x*deltaMultiplier.width, aDelta.y*deltaMultiplier.height);
|
|
|
|
if (aSnap == nsIScrollableFrame::ENABLE_SNAP) {
|
|
ScrollbarStyles styles = GetScrollbarStylesFromFrame();
|
|
if (styles.mScrollSnapTypeY != NS_STYLE_SCROLL_SNAP_TYPE_NONE ||
|
|
styles.mScrollSnapTypeX != NS_STYLE_SCROLL_SNAP_TYPE_NONE) {
|
|
nscoord appUnitsPerDevPixel = mOuter->PresContext()->AppUnitsPerDevPixel();
|
|
deltaMultiplier = nsSize(appUnitsPerDevPixel, appUnitsPerDevPixel);
|
|
negativeTolerance = 0.1f;
|
|
positiveTolerance = 0;
|
|
nsIScrollableFrame::ScrollUnit snapUnit = aUnit;
|
|
if (aOrigin == nsGkAtoms::mouseWheel) {
|
|
// When using a clicky scroll wheel, snap point selection works the same
|
|
// as keyboard up/down/left/right navigation, but with varying amounts
|
|
// of scroll delta.
|
|
snapUnit = nsIScrollableFrame::LINES;
|
|
}
|
|
GetSnapPointForDestination(snapUnit, mDestination, newPos);
|
|
}
|
|
}
|
|
|
|
// Calculate desired range values.
|
|
nscoord rangeLowerX, rangeUpperX, rangeLowerY, rangeUpperY;
|
|
CalcRangeForScrollBy(aDelta.x, newPos.x, negativeTolerance, positiveTolerance,
|
|
deltaMultiplier.width, &rangeLowerX, &rangeUpperX);
|
|
CalcRangeForScrollBy(aDelta.y, newPos.y, negativeTolerance, positiveTolerance,
|
|
deltaMultiplier.height, &rangeLowerY, &rangeUpperY);
|
|
nsRect range(rangeLowerX,
|
|
rangeLowerY,
|
|
rangeUpperX - rangeLowerX,
|
|
rangeUpperY - rangeLowerY);
|
|
nsWeakFrame weakFrame(mOuter);
|
|
ScrollToWithOrigin(newPos, aMode, aOrigin, &range);
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
|
|
if (aOverflow) {
|
|
nsPoint clampAmount = newPos - mDestination;
|
|
float appUnitsPerDevPixel = mOuter->PresContext()->AppUnitsPerDevPixel();
|
|
*aOverflow = nsIntPoint(
|
|
NSAppUnitsToIntPixels(clampAmount.x, appUnitsPerDevPixel),
|
|
NSAppUnitsToIntPixels(clampAmount.y, appUnitsPerDevPixel));
|
|
}
|
|
|
|
if (aUnit == nsIScrollableFrame::DEVICE_PIXELS &&
|
|
!nsLayoutUtils::AsyncPanZoomEnabled(mOuter))
|
|
{
|
|
// When APZ is disabled, we must track the velocity
|
|
// on the main thread; otherwise, the APZC will manage this.
|
|
mVelocityQueue.Sample(GetScrollPosition());
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollSnap(nsIScrollableFrame::ScrollMode aMode)
|
|
{
|
|
float flingSensitivity = gfxPrefs::ScrollSnapPredictionSensitivity();
|
|
int maxVelocity = gfxPrefs::ScrollSnapPredictionMaxVelocity();
|
|
maxVelocity = nsPresContext::CSSPixelsToAppUnits(maxVelocity);
|
|
int maxOffset = maxVelocity * flingSensitivity;
|
|
nsPoint velocity = mVelocityQueue.GetVelocity();
|
|
// Multiply each component individually to avoid integer multiply
|
|
nsPoint predictedOffset = nsPoint(velocity.x * flingSensitivity,
|
|
velocity.y * flingSensitivity);
|
|
predictedOffset.Clamp(maxOffset);
|
|
nsPoint pos = GetScrollPosition();
|
|
nsPoint destinationPos = pos + predictedOffset;
|
|
ScrollSnap(destinationPos, aMode);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::FlingSnap(const mozilla::CSSPoint& aDestination)
|
|
{
|
|
ScrollSnap(CSSPoint::ToAppUnits(aDestination));
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ScrollSnap(const nsPoint &aDestination,
|
|
nsIScrollableFrame::ScrollMode aMode)
|
|
{
|
|
nsRect scrollRange = GetScrollRangeForClamping();
|
|
nsPoint pos = GetScrollPosition();
|
|
nsPoint snapDestination = scrollRange.ClampPoint(aDestination);
|
|
if (GetSnapPointForDestination(nsIScrollableFrame::DEVICE_PIXELS,
|
|
pos,
|
|
snapDestination)) {
|
|
ScrollTo(snapDestination, aMode);
|
|
}
|
|
}
|
|
|
|
nsSize
|
|
ScrollFrameHelper::GetLineScrollAmount() const
|
|
{
|
|
nsRefPtr<nsFontMetrics> fm;
|
|
nsLayoutUtils::GetFontMetricsForFrame(mOuter, getter_AddRefs(fm),
|
|
nsLayoutUtils::FontSizeInflationFor(mOuter));
|
|
NS_ASSERTION(fm, "FontMetrics is null, assuming fontHeight == 1 appunit");
|
|
static nscoord sMinLineScrollAmountInPixels = -1;
|
|
if (sMinLineScrollAmountInPixels < 0) {
|
|
Preferences::AddIntVarCache(&sMinLineScrollAmountInPixels,
|
|
"mousewheel.min_line_scroll_amount", 1);
|
|
}
|
|
int32_t appUnitsPerDevPixel = mOuter->PresContext()->AppUnitsPerDevPixel();
|
|
nscoord minScrollAmountInAppUnits =
|
|
std::max(1, sMinLineScrollAmountInPixels) * appUnitsPerDevPixel;
|
|
nscoord horizontalAmount = fm ? fm->AveCharWidth() : 0;
|
|
nscoord verticalAmount = fm ? fm->MaxHeight() : 0;
|
|
return nsSize(std::max(horizontalAmount, minScrollAmountInAppUnits),
|
|
std::max(verticalAmount, minScrollAmountInAppUnits));
|
|
}
|
|
|
|
/**
|
|
* Compute the scrollport size excluding any fixed-pos headers and
|
|
* footers. A header or footer is an box that spans that entire width
|
|
* of the viewport and touches the top (or bottom, respectively) of the
|
|
* viewport. We also want to consider fixed elements that stack or overlap
|
|
* to effectively create a larger header or footer. Headers and footers that
|
|
* cover more than a third of the the viewport are ignored since they
|
|
* probably aren't true headers and footers and we don't want to restrict
|
|
* scrolling too much in such cases. This is a bit conservative --- some
|
|
* pages use elements as headers or footers that don't span the entire width
|
|
* of the viewport --- but it should be a good start.
|
|
*/
|
|
struct TopAndBottom
|
|
{
|
|
TopAndBottom(nscoord aTop, nscoord aBottom) : top(aTop), bottom(aBottom) {}
|
|
|
|
nscoord top, bottom;
|
|
};
|
|
struct TopComparator
|
|
{
|
|
bool Equals(const TopAndBottom& A, const TopAndBottom& B) const {
|
|
return A.top == B.top;
|
|
}
|
|
bool LessThan(const TopAndBottom& A, const TopAndBottom& B) const {
|
|
return A.top < B.top;
|
|
}
|
|
};
|
|
struct ReverseBottomComparator
|
|
{
|
|
bool Equals(const TopAndBottom& A, const TopAndBottom& B) const {
|
|
return A.bottom == B.bottom;
|
|
}
|
|
bool LessThan(const TopAndBottom& A, const TopAndBottom& B) const {
|
|
return A.bottom > B.bottom;
|
|
}
|
|
};
|
|
static nsSize
|
|
GetScrollPortSizeExcludingHeadersAndFooters(nsIFrame* aViewportFrame,
|
|
const nsRect& aScrollPort)
|
|
{
|
|
nsTArray<TopAndBottom> list;
|
|
nsFrameList fixedFrames = aViewportFrame->GetChildList(nsIFrame::kFixedList);
|
|
for (nsFrameList::Enumerator iterator(fixedFrames); !iterator.AtEnd();
|
|
iterator.Next()) {
|
|
nsIFrame* f = iterator.get();
|
|
nsRect r = f->GetRect().Intersect(aScrollPort);
|
|
if (r.x == 0 && r.width == aScrollPort.width &&
|
|
r.height <= aScrollPort.height/3) {
|
|
list.AppendElement(TopAndBottom(r.y, r.YMost()));
|
|
}
|
|
}
|
|
|
|
list.Sort(TopComparator());
|
|
nscoord headerBottom = 0;
|
|
for (uint32_t i = 0; i < list.Length(); ++i) {
|
|
if (list[i].top <= headerBottom) {
|
|
headerBottom = std::max(headerBottom, list[i].bottom);
|
|
}
|
|
}
|
|
|
|
list.Sort(ReverseBottomComparator());
|
|
nscoord footerTop = aScrollPort.height;
|
|
for (uint32_t i = 0; i < list.Length(); ++i) {
|
|
if (list[i].bottom >= footerTop) {
|
|
footerTop = std::min(footerTop, list[i].top);
|
|
}
|
|
}
|
|
|
|
headerBottom = std::min(aScrollPort.height/3, headerBottom);
|
|
footerTop = std::max(aScrollPort.height - aScrollPort.height/3, footerTop);
|
|
|
|
return nsSize(aScrollPort.width, footerTop - headerBottom);
|
|
}
|
|
|
|
nsSize
|
|
ScrollFrameHelper::GetPageScrollAmount() const
|
|
{
|
|
nsSize lineScrollAmount = GetLineScrollAmount();
|
|
nsSize effectiveScrollPortSize;
|
|
if (mIsRoot) {
|
|
// Reduce effective scrollport height by the height of any fixed-pos
|
|
// headers or footers
|
|
nsIFrame* root = mOuter->PresContext()->PresShell()->GetRootFrame();
|
|
effectiveScrollPortSize =
|
|
GetScrollPortSizeExcludingHeadersAndFooters(root, mScrollPort);
|
|
} else {
|
|
effectiveScrollPortSize = mScrollPort.Size();
|
|
}
|
|
// The page increment is the size of the page, minus the smaller of
|
|
// 10% of the size or 2 lines.
|
|
return nsSize(
|
|
effectiveScrollPortSize.width -
|
|
std::min(effectiveScrollPortSize.width/10, 2*lineScrollAmount.width),
|
|
effectiveScrollPortSize.height -
|
|
std::min(effectiveScrollPortSize.height/10, 2*lineScrollAmount.height));
|
|
}
|
|
|
|
/**
|
|
* this code is resposible for restoring the scroll position back to some
|
|
* saved position. if the user has not moved the scroll position manually
|
|
* we keep scrolling down until we get to our original position. keep in
|
|
* mind that content could incrementally be coming in. we only want to stop
|
|
* when we reach our new position.
|
|
*/
|
|
void
|
|
ScrollFrameHelper::ScrollToRestoredPosition()
|
|
{
|
|
if (mRestorePos.y == -1 || mLastPos.x == -1 || mLastPos.y == -1) {
|
|
return;
|
|
}
|
|
// make sure our scroll position did not change for where we last put
|
|
// it. if it does then the user must have moved it, and we no longer
|
|
// need to restore.
|
|
//
|
|
// In the RTL case, we check whether the scroll position changed using the
|
|
// logical scroll position, but we scroll to the physical scroll position in
|
|
// all cases
|
|
|
|
// if we didn't move, we still need to restore
|
|
if (GetLogicalScrollPosition() == mLastPos) {
|
|
// if our desired position is different to the scroll position, scroll.
|
|
// remember that we could be incrementally loading so we may enter
|
|
// and scroll many times.
|
|
if (mRestorePos != mLastPos /* GetLogicalScrollPosition() */) {
|
|
nsPoint scrollToPos = mRestorePos;
|
|
if (!IsLTR())
|
|
// convert from logical to physical scroll position
|
|
scrollToPos.x = mScrollPort.x -
|
|
(mScrollPort.XMost() - scrollToPos.x - mScrolledFrame->GetRect().width);
|
|
nsWeakFrame weakFrame(mOuter);
|
|
ScrollTo(scrollToPos, nsIScrollableFrame::INSTANT);
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
// Re-get the scroll position, it might not be exactly equal to
|
|
// mRestorePos due to rounding and clamping.
|
|
mLastPos = GetLogicalScrollPosition();
|
|
} else {
|
|
// if we reached the position then stop
|
|
mRestorePos.y = -1;
|
|
mLastPos.x = -1;
|
|
mLastPos.y = -1;
|
|
}
|
|
} else {
|
|
// user moved the position, so we won't need to restore
|
|
mLastPos.x = -1;
|
|
mLastPos.y = -1;
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
ScrollFrameHelper::FireScrollPortEvent()
|
|
{
|
|
mAsyncScrollPortEvent.Forget();
|
|
|
|
// Keep this in sync with PostOverflowEvent().
|
|
nsSize scrollportSize = mScrollPort.Size();
|
|
nsSize childSize = GetScrolledRect().Size();
|
|
|
|
bool newVerticalOverflow = childSize.height > scrollportSize.height;
|
|
bool vertChanged = mVerticalOverflow != newVerticalOverflow;
|
|
|
|
bool newHorizontalOverflow = childSize.width > scrollportSize.width;
|
|
bool horizChanged = mHorizontalOverflow != newHorizontalOverflow;
|
|
|
|
if (!vertChanged && !horizChanged) {
|
|
return NS_OK;
|
|
}
|
|
|
|
// If both either overflowed or underflowed then we dispatch only one
|
|
// DOM event.
|
|
bool both = vertChanged && horizChanged &&
|
|
newVerticalOverflow == newHorizontalOverflow;
|
|
InternalScrollPortEvent::orientType orient;
|
|
if (both) {
|
|
orient = InternalScrollPortEvent::both;
|
|
mHorizontalOverflow = newHorizontalOverflow;
|
|
mVerticalOverflow = newVerticalOverflow;
|
|
}
|
|
else if (vertChanged) {
|
|
orient = InternalScrollPortEvent::vertical;
|
|
mVerticalOverflow = newVerticalOverflow;
|
|
if (horizChanged) {
|
|
// We need to dispatch a separate horizontal DOM event. Do that the next
|
|
// time around since dispatching the vertical DOM event might destroy
|
|
// the frame.
|
|
PostOverflowEvent();
|
|
}
|
|
}
|
|
else {
|
|
orient = InternalScrollPortEvent::horizontal;
|
|
mHorizontalOverflow = newHorizontalOverflow;
|
|
}
|
|
|
|
InternalScrollPortEvent event(true,
|
|
(orient == InternalScrollPortEvent::horizontal ? mHorizontalOverflow :
|
|
mVerticalOverflow) ?
|
|
eScrollPortOverflow : eScrollPortUnderflow, nullptr);
|
|
event.orient = orient;
|
|
return EventDispatcher::Dispatch(mOuter->GetContent(),
|
|
mOuter->PresContext(), &event);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ReloadChildFrames()
|
|
{
|
|
mScrolledFrame = nullptr;
|
|
mHScrollbarBox = nullptr;
|
|
mVScrollbarBox = nullptr;
|
|
mScrollCornerBox = nullptr;
|
|
mResizerBox = nullptr;
|
|
|
|
nsIFrame* frame = mOuter->GetFirstPrincipalChild();
|
|
while (frame) {
|
|
nsIContent* content = frame->GetContent();
|
|
if (content == mOuter->GetContent()) {
|
|
NS_ASSERTION(!mScrolledFrame, "Already found the scrolled frame");
|
|
mScrolledFrame = frame;
|
|
} else {
|
|
nsAutoString value;
|
|
content->GetAttr(kNameSpaceID_None, nsGkAtoms::orient, value);
|
|
if (!value.IsEmpty()) {
|
|
// probably a scrollbar then
|
|
if (value.LowerCaseEqualsLiteral("horizontal")) {
|
|
NS_ASSERTION(!mHScrollbarBox, "Found multiple horizontal scrollbars?");
|
|
mHScrollbarBox = frame;
|
|
} else {
|
|
NS_ASSERTION(!mVScrollbarBox, "Found multiple vertical scrollbars?");
|
|
mVScrollbarBox = frame;
|
|
}
|
|
} else if (content->IsXULElement(nsGkAtoms::resizer)) {
|
|
NS_ASSERTION(!mResizerBox, "Found multiple resizers");
|
|
mResizerBox = frame;
|
|
} else if (content->IsXULElement(nsGkAtoms::scrollcorner)) {
|
|
// probably a scrollcorner
|
|
NS_ASSERTION(!mScrollCornerBox, "Found multiple scrollcorners");
|
|
mScrollCornerBox = frame;
|
|
}
|
|
}
|
|
|
|
frame = frame->GetNextSibling();
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
ScrollFrameHelper::CreateAnonymousContent(
|
|
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements)
|
|
{
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
nsIFrame* parent = mOuter->GetParent();
|
|
|
|
// Don't create scrollbars if we're an SVG document being used as an image,
|
|
// or if we're printing/print previewing.
|
|
// (In the printing case, we allow scrollbars if this is the child of the
|
|
// viewport & paginated scrolling is enabled, because then we must be the
|
|
// scroll frame for the print preview window, & that does need scrollbars.)
|
|
if (presContext->Document()->IsBeingUsedAsImage() ||
|
|
(!presContext->IsDynamic() &&
|
|
!(mIsRoot && presContext->HasPaginatedScrolling()))) {
|
|
mNeverHasVerticalScrollbar = mNeverHasHorizontalScrollbar = true;
|
|
return NS_OK;
|
|
}
|
|
|
|
// Check if the frame is resizable.
|
|
int8_t resizeStyle = mOuter->StyleDisplay()->mResize;
|
|
bool isResizable = resizeStyle != NS_STYLE_RESIZE_NONE;
|
|
|
|
nsIScrollableFrame *scrollable = do_QueryFrame(mOuter);
|
|
|
|
// If we're the scrollframe for the root, then we want to construct
|
|
// our scrollbar frames no matter what. That way later dynamic
|
|
// changes to propagated overflow styles will show or hide
|
|
// scrollbars on the viewport without requiring frame reconstruction
|
|
// of the viewport (good!).
|
|
bool canHaveHorizontal;
|
|
bool canHaveVertical;
|
|
if (!mIsRoot) {
|
|
ScrollbarStyles styles = scrollable->GetScrollbarStyles();
|
|
canHaveHorizontal = styles.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN;
|
|
canHaveVertical = styles.mVertical != NS_STYLE_OVERFLOW_HIDDEN;
|
|
if (!canHaveHorizontal && !canHaveVertical && !isResizable) {
|
|
// Nothing to do.
|
|
return NS_OK;
|
|
}
|
|
} else {
|
|
canHaveHorizontal = true;
|
|
canHaveVertical = true;
|
|
}
|
|
|
|
// The anonymous <div> used by <inputs> never gets scrollbars.
|
|
nsITextControlFrame* textFrame = do_QueryFrame(parent);
|
|
if (textFrame) {
|
|
// Make sure we are not a text area.
|
|
nsCOMPtr<nsIDOMHTMLTextAreaElement> textAreaElement(do_QueryInterface(parent->GetContent()));
|
|
if (!textAreaElement) {
|
|
mNeverHasVerticalScrollbar = mNeverHasHorizontalScrollbar = true;
|
|
return NS_OK;
|
|
}
|
|
}
|
|
|
|
nsNodeInfoManager *nodeInfoManager =
|
|
presContext->Document()->NodeInfoManager();
|
|
nsRefPtr<NodeInfo> nodeInfo;
|
|
nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::scrollbar, nullptr,
|
|
kNameSpaceID_XUL,
|
|
nsIDOMNode::ELEMENT_NODE);
|
|
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
|
|
|
|
if (canHaveHorizontal) {
|
|
nsRefPtr<NodeInfo> ni = nodeInfo;
|
|
NS_TrustedNewXULElement(getter_AddRefs(mHScrollbarContent), ni.forget());
|
|
#ifdef DEBUG
|
|
// Scrollbars can get restyled by theme changes. Whether such a restyle
|
|
// will actually reconstruct them correctly if it involves a frame
|
|
// reconstruct... I don't know. :(
|
|
mHScrollbarContent->SetProperty(nsGkAtoms::restylableAnonymousNode,
|
|
reinterpret_cast<void*>(true));
|
|
#endif // DEBUG
|
|
|
|
mHScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orient,
|
|
NS_LITERAL_STRING("horizontal"), false);
|
|
mHScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::clickthrough,
|
|
NS_LITERAL_STRING("always"), false);
|
|
if (mIsRoot) {
|
|
mHScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::root_,
|
|
NS_LITERAL_STRING("true"), false);
|
|
}
|
|
if (!aElements.AppendElement(mHScrollbarContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if (canHaveVertical) {
|
|
nsRefPtr<NodeInfo> ni = nodeInfo;
|
|
NS_TrustedNewXULElement(getter_AddRefs(mVScrollbarContent), ni.forget());
|
|
#ifdef DEBUG
|
|
// Scrollbars can get restyled by theme changes. Whether such a restyle
|
|
// will actually reconstruct them correctly if it involves a frame
|
|
// reconstruct... I don't know. :(
|
|
mVScrollbarContent->SetProperty(nsGkAtoms::restylableAnonymousNode,
|
|
reinterpret_cast<void*>(true));
|
|
#endif // DEBUG
|
|
|
|
mVScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orient,
|
|
NS_LITERAL_STRING("vertical"), false);
|
|
mVScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::clickthrough,
|
|
NS_LITERAL_STRING("always"), false);
|
|
if (mIsRoot) {
|
|
mVScrollbarContent->SetAttr(kNameSpaceID_None, nsGkAtoms::root_,
|
|
NS_LITERAL_STRING("true"), false);
|
|
}
|
|
if (!aElements.AppendElement(mVScrollbarContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if (isResizable) {
|
|
nsRefPtr<NodeInfo> nodeInfo;
|
|
nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::resizer, nullptr,
|
|
kNameSpaceID_XUL,
|
|
nsIDOMNode::ELEMENT_NODE);
|
|
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
|
|
|
|
NS_TrustedNewXULElement(getter_AddRefs(mResizerContent), nodeInfo.forget());
|
|
|
|
nsAutoString dir;
|
|
switch (resizeStyle) {
|
|
case NS_STYLE_RESIZE_HORIZONTAL:
|
|
if (IsScrollbarOnRight()) {
|
|
dir.AssignLiteral("right");
|
|
}
|
|
else {
|
|
dir.AssignLiteral("left");
|
|
}
|
|
break;
|
|
case NS_STYLE_RESIZE_VERTICAL:
|
|
dir.AssignLiteral("bottom");
|
|
break;
|
|
case NS_STYLE_RESIZE_BOTH:
|
|
dir.AssignLiteral("bottomend");
|
|
break;
|
|
default:
|
|
NS_WARNING("only resizable types should have resizers");
|
|
}
|
|
mResizerContent->SetAttr(kNameSpaceID_None, nsGkAtoms::dir, dir, false);
|
|
|
|
if (mIsRoot) {
|
|
nsIContent* browserRoot = GetBrowserRoot(mOuter->GetContent());
|
|
mCollapsedResizer = !(browserRoot &&
|
|
browserRoot->HasAttr(kNameSpaceID_None, nsGkAtoms::showresizer));
|
|
}
|
|
else {
|
|
mResizerContent->SetAttr(kNameSpaceID_None, nsGkAtoms::element,
|
|
NS_LITERAL_STRING("_parent"), false);
|
|
}
|
|
|
|
mResizerContent->SetAttr(kNameSpaceID_None, nsGkAtoms::clickthrough,
|
|
NS_LITERAL_STRING("always"), false);
|
|
|
|
if (!aElements.AppendElement(mResizerContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if (canHaveHorizontal && canHaveVertical) {
|
|
nodeInfo = nodeInfoManager->GetNodeInfo(nsGkAtoms::scrollcorner, nullptr,
|
|
kNameSpaceID_XUL,
|
|
nsIDOMNode::ELEMENT_NODE);
|
|
NS_TrustedNewXULElement(getter_AddRefs(mScrollCornerContent), nodeInfo.forget());
|
|
if (!aElements.AppendElement(mScrollCornerContent))
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
|
|
uint32_t aFilter)
|
|
{
|
|
if (mHScrollbarContent) {
|
|
aElements.AppendElement(mHScrollbarContent);
|
|
}
|
|
|
|
if (mVScrollbarContent) {
|
|
aElements.AppendElement(mVScrollbarContent);
|
|
}
|
|
|
|
if (mScrollCornerContent) {
|
|
aElements.AppendElement(mScrollCornerContent);
|
|
}
|
|
|
|
if (mResizerContent) {
|
|
aElements.AppendElement(mResizerContent);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::Destroy()
|
|
{
|
|
if (mScrollbarActivity) {
|
|
mScrollbarActivity->Destroy();
|
|
mScrollbarActivity = nullptr;
|
|
}
|
|
|
|
// Unbind any content created in CreateAnonymousContent from the tree
|
|
nsContentUtils::DestroyAnonymousContent(&mHScrollbarContent);
|
|
nsContentUtils::DestroyAnonymousContent(&mVScrollbarContent);
|
|
nsContentUtils::DestroyAnonymousContent(&mScrollCornerContent);
|
|
nsContentUtils::DestroyAnonymousContent(&mResizerContent);
|
|
|
|
if (mPostedReflowCallback) {
|
|
mOuter->PresContext()->PresShell()->CancelReflowCallback(this);
|
|
mPostedReflowCallback = false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called when we want to update the scrollbar position, either because scrolling happened
|
|
* or the user moved the scrollbar position and we need to undo that (e.g., when the user
|
|
* clicks to scroll and we're using smooth scrolling, so we need to put the thumb back
|
|
* to its initial position for the start of the smooth sequence).
|
|
*/
|
|
void
|
|
ScrollFrameHelper::UpdateScrollbarPosition()
|
|
{
|
|
nsWeakFrame weakFrame(mOuter);
|
|
mFrameIsUpdatingScrollbar = true;
|
|
|
|
nsPoint pt = GetScrollPosition();
|
|
if (mVScrollbarBox) {
|
|
SetCoordAttribute(mVScrollbarBox->GetContent(), nsGkAtoms::curpos,
|
|
pt.y - GetScrolledRect().y);
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
}
|
|
if (mHScrollbarBox) {
|
|
SetCoordAttribute(mHScrollbarBox->GetContent(), nsGkAtoms::curpos,
|
|
pt.x - GetScrolledRect().x);
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
mFrameIsUpdatingScrollbar = false;
|
|
}
|
|
|
|
void ScrollFrameHelper::CurPosAttributeChanged(nsIContent* aContent)
|
|
{
|
|
NS_ASSERTION(aContent, "aContent must not be null");
|
|
NS_ASSERTION((mHScrollbarBox && mHScrollbarBox->GetContent() == aContent) ||
|
|
(mVScrollbarBox && mVScrollbarBox->GetContent() == aContent),
|
|
"unexpected child");
|
|
|
|
// Attribute changes on the scrollbars happen in one of three ways:
|
|
// 1) The scrollbar changed the attribute in response to some user event
|
|
// 2) We changed the attribute in response to a ScrollPositionDidChange
|
|
// callback from the scrolling view
|
|
// 3) We changed the attribute to adjust the scrollbars for the start
|
|
// of a smooth scroll operation
|
|
//
|
|
// In cases 2 and 3 we do not need to scroll because we're just
|
|
// updating our scrollbar.
|
|
if (mFrameIsUpdatingScrollbar)
|
|
return;
|
|
|
|
nsRect scrolledRect = GetScrolledRect();
|
|
|
|
nsPoint current = GetScrollPosition() - scrolledRect.TopLeft();
|
|
nsPoint dest;
|
|
nsRect allowedRange;
|
|
dest.x = GetCoordAttribute(mHScrollbarBox, nsGkAtoms::curpos, current.x,
|
|
&allowedRange.x, &allowedRange.width);
|
|
dest.y = GetCoordAttribute(mVScrollbarBox, nsGkAtoms::curpos, current.y,
|
|
&allowedRange.y, &allowedRange.height);
|
|
current += scrolledRect.TopLeft();
|
|
dest += scrolledRect.TopLeft();
|
|
allowedRange += scrolledRect.TopLeft();
|
|
|
|
// Don't try to scroll if we're already at an acceptable place.
|
|
// Don't call Contains here since Contains returns false when the point is
|
|
// on the bottom or right edge of the rectangle.
|
|
if (allowedRange.ClampPoint(current) == current) {
|
|
return;
|
|
}
|
|
|
|
if (mScrollbarActivity) {
|
|
nsRefPtr<ScrollbarActivity> scrollbarActivity(mScrollbarActivity);
|
|
scrollbarActivity->ActivityOccurred();
|
|
}
|
|
|
|
bool isSmooth = aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::smooth);
|
|
if (isSmooth) {
|
|
// Make sure an attribute-setting callback occurs even if the view
|
|
// didn't actually move yet. We need to make sure other listeners
|
|
// see that the scroll position is not (yet) what they thought it
|
|
// was.
|
|
nsWeakFrame weakFrame(mOuter);
|
|
UpdateScrollbarPosition();
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
}
|
|
ScrollToWithOrigin(dest,
|
|
isSmooth ? nsIScrollableFrame::SMOOTH : nsIScrollableFrame::INSTANT,
|
|
nsGkAtoms::scrollbars, &allowedRange);
|
|
// 'this' might be destroyed here
|
|
}
|
|
|
|
/* ============= Scroll events ========== */
|
|
|
|
NS_IMETHODIMP
|
|
ScrollFrameHelper::ScrollEvent::Run()
|
|
{
|
|
if (mHelper)
|
|
mHelper->FireScrollEvent();
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::FireScrollEvent()
|
|
{
|
|
mScrollEvent.Forget();
|
|
|
|
WidgetGUIEvent event(true, eScroll, nullptr);
|
|
nsEventStatus status = nsEventStatus_eIgnore;
|
|
nsIContent* content = mOuter->GetContent();
|
|
nsPresContext* prescontext = mOuter->PresContext();
|
|
// Fire viewport scroll events at the document (where they
|
|
// will bubble to the window)
|
|
if (mIsRoot) {
|
|
nsIDocument* doc = content->GetCurrentDoc();
|
|
if (doc) {
|
|
EventDispatcher::Dispatch(doc, prescontext, &event, nullptr, &status);
|
|
}
|
|
} else {
|
|
// scroll events fired at elements don't bubble (although scroll events
|
|
// fired at documents do, to the window)
|
|
event.mFlags.mBubbles = false;
|
|
EventDispatcher::Dispatch(content, prescontext, &event, nullptr, &status);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::PostScrollEvent()
|
|
{
|
|
if (mScrollEvent.IsPending())
|
|
return;
|
|
|
|
nsRootPresContext* rpc = mOuter->PresContext()->GetRootPresContext();
|
|
if (!rpc)
|
|
return;
|
|
mScrollEvent = new ScrollEvent(this);
|
|
rpc->AddWillPaintObserver(mScrollEvent.get());
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
ScrollFrameHelper::AsyncScrollPortEvent::Run()
|
|
{
|
|
if (mHelper) {
|
|
mHelper->mOuter->PresContext()->GetPresShell()->
|
|
FlushPendingNotifications(Flush_InterruptibleLayout);
|
|
}
|
|
return mHelper ? mHelper->FireScrollPortEvent() : NS_OK;
|
|
}
|
|
|
|
bool
|
|
nsXULScrollFrame::AddHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom)
|
|
{
|
|
if (!mHelper.mHScrollbarBox)
|
|
return true;
|
|
|
|
return AddRemoveScrollbar(aState, aOnBottom, true, true);
|
|
}
|
|
|
|
bool
|
|
nsXULScrollFrame::AddVerticalScrollbar(nsBoxLayoutState& aState, bool aOnRight)
|
|
{
|
|
if (!mHelper.mVScrollbarBox)
|
|
return true;
|
|
|
|
return AddRemoveScrollbar(aState, aOnRight, false, true);
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::RemoveHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom)
|
|
{
|
|
// removing a scrollbar should always fit
|
|
DebugOnly<bool> result = AddRemoveScrollbar(aState, aOnBottom, true, false);
|
|
NS_ASSERTION(result, "Removing horizontal scrollbar failed to fit??");
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::RemoveVerticalScrollbar(nsBoxLayoutState& aState, bool aOnRight)
|
|
{
|
|
// removing a scrollbar should always fit
|
|
DebugOnly<bool> result = AddRemoveScrollbar(aState, aOnRight, false, false);
|
|
NS_ASSERTION(result, "Removing vertical scrollbar failed to fit??");
|
|
}
|
|
|
|
bool
|
|
nsXULScrollFrame::AddRemoveScrollbar(nsBoxLayoutState& aState,
|
|
bool aOnRightOrBottom, bool aHorizontal, bool aAdd)
|
|
{
|
|
if (aHorizontal) {
|
|
if (mHelper.mNeverHasHorizontalScrollbar || !mHelper.mHScrollbarBox)
|
|
return false;
|
|
|
|
nsSize hSize = mHelper.mHScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mHelper.mHScrollbarBox, hSize);
|
|
|
|
mHelper.SetScrollbarVisibility(mHelper.mHScrollbarBox, aAdd);
|
|
|
|
bool hasHorizontalScrollbar;
|
|
bool fit = AddRemoveScrollbar(hasHorizontalScrollbar,
|
|
mHelper.mScrollPort.y,
|
|
mHelper.mScrollPort.height,
|
|
hSize.height, aOnRightOrBottom, aAdd);
|
|
mHelper.mHasHorizontalScrollbar = hasHorizontalScrollbar; // because mHasHorizontalScrollbar is a bool
|
|
if (!fit)
|
|
mHelper.SetScrollbarVisibility(mHelper.mHScrollbarBox, !aAdd);
|
|
|
|
return fit;
|
|
} else {
|
|
if (mHelper.mNeverHasVerticalScrollbar || !mHelper.mVScrollbarBox)
|
|
return false;
|
|
|
|
nsSize vSize = mHelper.mVScrollbarBox->GetPrefSize(aState);
|
|
nsBox::AddMargin(mHelper.mVScrollbarBox, vSize);
|
|
|
|
mHelper.SetScrollbarVisibility(mHelper.mVScrollbarBox, aAdd);
|
|
|
|
bool hasVerticalScrollbar;
|
|
bool fit = AddRemoveScrollbar(hasVerticalScrollbar,
|
|
mHelper.mScrollPort.x,
|
|
mHelper.mScrollPort.width,
|
|
vSize.width, aOnRightOrBottom, aAdd);
|
|
mHelper.mHasVerticalScrollbar = hasVerticalScrollbar; // because mHasVerticalScrollbar is a bool
|
|
if (!fit)
|
|
mHelper.SetScrollbarVisibility(mHelper.mVScrollbarBox, !aAdd);
|
|
|
|
return fit;
|
|
}
|
|
}
|
|
|
|
bool
|
|
nsXULScrollFrame::AddRemoveScrollbar(bool& aHasScrollbar, nscoord& aXY,
|
|
nscoord& aSize, nscoord aSbSize,
|
|
bool aOnRightOrBottom, bool aAdd)
|
|
{
|
|
nscoord size = aSize;
|
|
nscoord xy = aXY;
|
|
|
|
if (size != NS_INTRINSICSIZE) {
|
|
if (aAdd) {
|
|
size -= aSbSize;
|
|
if (!aOnRightOrBottom && size >= 0)
|
|
xy += aSbSize;
|
|
} else {
|
|
size += aSbSize;
|
|
if (!aOnRightOrBottom)
|
|
xy -= aSbSize;
|
|
}
|
|
}
|
|
|
|
// not enough room? Yes? Return true.
|
|
if (size >= 0) {
|
|
aHasScrollbar = aAdd;
|
|
aSize = size;
|
|
aXY = xy;
|
|
return true;
|
|
}
|
|
|
|
aHasScrollbar = false;
|
|
return false;
|
|
}
|
|
|
|
void
|
|
nsXULScrollFrame::LayoutScrollArea(nsBoxLayoutState& aState,
|
|
const nsPoint& aScrollPosition)
|
|
{
|
|
uint32_t oldflags = aState.LayoutFlags();
|
|
nsRect childRect = nsRect(mHelper.mScrollPort.TopLeft() - aScrollPosition,
|
|
mHelper.mScrollPort.Size());
|
|
int32_t flags = NS_FRAME_NO_MOVE_VIEW;
|
|
|
|
nsSize minSize = mHelper.mScrolledFrame->GetMinSize(aState);
|
|
|
|
if (minSize.height > childRect.height)
|
|
childRect.height = minSize.height;
|
|
|
|
if (minSize.width > childRect.width)
|
|
childRect.width = minSize.width;
|
|
|
|
aState.SetLayoutFlags(flags);
|
|
ClampAndSetBounds(aState, childRect, aScrollPosition);
|
|
mHelper.mScrolledFrame->Layout(aState);
|
|
|
|
childRect = mHelper.mScrolledFrame->GetRect();
|
|
|
|
if (childRect.width < mHelper.mScrollPort.width ||
|
|
childRect.height < mHelper.mScrollPort.height)
|
|
{
|
|
childRect.width = std::max(childRect.width, mHelper.mScrollPort.width);
|
|
childRect.height = std::max(childRect.height, mHelper.mScrollPort.height);
|
|
|
|
// remove overflow areas when we update the bounds,
|
|
// because we've already accounted for it
|
|
// REVIEW: Have we accounted for both?
|
|
ClampAndSetBounds(aState, childRect, aScrollPosition, true);
|
|
}
|
|
|
|
aState.SetLayoutFlags(oldflags);
|
|
|
|
}
|
|
|
|
void ScrollFrameHelper::PostOverflowEvent()
|
|
{
|
|
if (mAsyncScrollPortEvent.IsPending())
|
|
return;
|
|
|
|
// Keep this in sync with FireScrollPortEvent().
|
|
nsSize scrollportSize = mScrollPort.Size();
|
|
nsSize childSize = GetScrolledRect().Size();
|
|
|
|
bool newVerticalOverflow = childSize.height > scrollportSize.height;
|
|
bool vertChanged = mVerticalOverflow != newVerticalOverflow;
|
|
|
|
bool newHorizontalOverflow = childSize.width > scrollportSize.width;
|
|
bool horizChanged = mHorizontalOverflow != newHorizontalOverflow;
|
|
|
|
if (!vertChanged && !horizChanged) {
|
|
return;
|
|
}
|
|
|
|
nsRootPresContext* rpc = mOuter->PresContext()->GetRootPresContext();
|
|
if (!rpc)
|
|
return;
|
|
|
|
mAsyncScrollPortEvent = new AsyncScrollPortEvent(this);
|
|
rpc->AddWillPaintObserver(mAsyncScrollPortEvent.get());
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsLTR() const
|
|
{
|
|
//TODO make bidi code set these from preferences
|
|
|
|
nsIFrame *frame = mOuter;
|
|
// XXX This is a bit on the slow side.
|
|
if (mIsRoot) {
|
|
// If we're the root scrollframe, we need the root element's style data.
|
|
nsPresContext *presContext = mOuter->PresContext();
|
|
nsIDocument *document = presContext->Document();
|
|
Element *root = document->GetRootElement();
|
|
|
|
// But for HTML and XHTML we want the body element.
|
|
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
|
|
if (htmlDoc) {
|
|
Element *bodyElement = document->GetBodyElement();
|
|
if (bodyElement)
|
|
root = bodyElement; // we can trust the document to hold on to it
|
|
}
|
|
|
|
if (root) {
|
|
nsIFrame *rootsFrame = root->GetPrimaryFrame();
|
|
if (rootsFrame)
|
|
frame = rootsFrame;
|
|
}
|
|
}
|
|
|
|
WritingMode wm = frame->GetWritingMode();
|
|
return wm.IsVertical() ? wm.IsVerticalLR() : wm.IsBidiLTR();
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsScrollbarOnRight() const
|
|
{
|
|
nsPresContext *presContext = mOuter->PresContext();
|
|
|
|
// The position of the scrollbar in top-level windows depends on the pref
|
|
// layout.scrollbar.side. For non-top-level elements, it depends only on the
|
|
// directionaliy of the element (equivalent to a value of "1" for the pref).
|
|
if (!mIsRoot)
|
|
return IsLTR();
|
|
switch (presContext->GetCachedIntPref(kPresContext_ScrollbarSide)) {
|
|
default:
|
|
case 0: // UI directionality
|
|
return presContext->GetCachedIntPref(kPresContext_BidiDirection)
|
|
== IBMBIDI_TEXTDIRECTION_LTR;
|
|
case 1: // Document / content directionality
|
|
return IsLTR();
|
|
case 2: // Always right
|
|
return true;
|
|
case 3: // Always left
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsMaybeScrollingActive() const
|
|
{
|
|
const nsStyleDisplay* disp = mOuter->StyleDisplay();
|
|
if (disp && (disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_SCROLL)) {
|
|
return true;
|
|
}
|
|
|
|
return mHasBeenScrolledRecently ||
|
|
IsAlwaysActive() ||
|
|
mWillBuildScrollableLayer;
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::IsScrollingActive(nsDisplayListBuilder* aBuilder) const
|
|
{
|
|
const nsStyleDisplay* disp = mOuter->StyleDisplay();
|
|
if (disp && (disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_SCROLL) &&
|
|
aBuilder->IsInWillChangeBudget(mOuter, GetScrollPositionClampingScrollPortSize())) {
|
|
return true;
|
|
}
|
|
|
|
return mHasBeenScrolledRecently ||
|
|
IsAlwaysActive() ||
|
|
mWillBuildScrollableLayer;
|
|
}
|
|
|
|
/**
|
|
* Reflow the scroll area if it needs it and return its size. Also determine if the reflow will
|
|
* cause any of the scrollbars to need to be reflowed.
|
|
*/
|
|
nsresult
|
|
nsXULScrollFrame::Layout(nsBoxLayoutState& aState)
|
|
{
|
|
bool scrollbarRight = IsScrollbarOnRight();
|
|
bool scrollbarBottom = true;
|
|
|
|
// get the content rect
|
|
nsRect clientRect(0,0,0,0);
|
|
GetClientRect(clientRect);
|
|
|
|
nsRect oldScrollAreaBounds = mHelper.mScrollPort;
|
|
nsPoint oldScrollPosition = mHelper.GetLogicalScrollPosition();
|
|
|
|
// the scroll area size starts off as big as our content area
|
|
mHelper.mScrollPort = clientRect;
|
|
|
|
/**************
|
|
Our basic strategy here is to first try laying out the content with
|
|
the scrollbars in their current state. We're hoping that that will
|
|
just "work"; the content will overflow wherever there's a scrollbar
|
|
already visible. If that does work, then there's no need to lay out
|
|
the scrollarea. Otherwise we fix up the scrollbars; first we add a
|
|
vertical one to scroll the content if necessary, or remove it if
|
|
it's not needed. Then we reflow the content if the scrollbar
|
|
changed. Then we add a horizontal scrollbar if necessary (or
|
|
remove if not needed), and if that changed, we reflow the content
|
|
again. At this point, any scrollbars that are needed to scroll the
|
|
content have been added.
|
|
|
|
In the second phase we check to see if any scrollbars are too small
|
|
to display, and if so, we remove them. We check the horizontal
|
|
scrollbar first; removing it might make room for the vertical
|
|
scrollbar, and if we have room for just one scrollbar we'll save
|
|
the vertical one.
|
|
|
|
Finally we position and size the scrollbars and scrollcorner (the
|
|
square that is needed in the corner of the window when two
|
|
scrollbars are visible), and reflow any fixed position views
|
|
(if we're the viewport and we added or removed a scrollbar).
|
|
**************/
|
|
|
|
ScrollbarStyles styles = GetScrollbarStyles();
|
|
|
|
// Look at our style do we always have vertical or horizontal scrollbars?
|
|
if (styles.mHorizontal == NS_STYLE_OVERFLOW_SCROLL)
|
|
mHelper.mHasHorizontalScrollbar = true;
|
|
if (styles.mVertical == NS_STYLE_OVERFLOW_SCROLL)
|
|
mHelper.mHasVerticalScrollbar = true;
|
|
|
|
if (mHelper.mHasHorizontalScrollbar)
|
|
AddHorizontalScrollbar(aState, scrollbarBottom);
|
|
|
|
if (mHelper.mHasVerticalScrollbar)
|
|
AddVerticalScrollbar(aState, scrollbarRight);
|
|
|
|
// layout our the scroll area
|
|
LayoutScrollArea(aState, oldScrollPosition);
|
|
|
|
// now look at the content area and see if we need scrollbars or not
|
|
bool needsLayout = false;
|
|
|
|
// if we have 'auto' scrollbars look at the vertical case
|
|
if (styles.mVertical != NS_STYLE_OVERFLOW_SCROLL) {
|
|
// These are only good until the call to LayoutScrollArea.
|
|
nsRect scrolledRect = mHelper.GetScrolledRect();
|
|
|
|
// There are two cases to consider
|
|
if (scrolledRect.height <= mHelper.mScrollPort.height
|
|
|| styles.mVertical != NS_STYLE_OVERFLOW_AUTO) {
|
|
if (mHelper.mHasVerticalScrollbar) {
|
|
// We left room for the vertical scrollbar, but it's not needed;
|
|
// remove it.
|
|
RemoveVerticalScrollbar(aState, scrollbarRight);
|
|
needsLayout = true;
|
|
}
|
|
} else {
|
|
if (!mHelper.mHasVerticalScrollbar) {
|
|
// We didn't leave room for the vertical scrollbar, but it turns
|
|
// out we needed it
|
|
if (AddVerticalScrollbar(aState, scrollbarRight))
|
|
needsLayout = true;
|
|
}
|
|
}
|
|
|
|
// ok layout at the right size
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, oldScrollPosition);
|
|
needsLayout = false;
|
|
}
|
|
}
|
|
|
|
|
|
// if scrollbars are auto look at the horizontal case
|
|
if (styles.mHorizontal != NS_STYLE_OVERFLOW_SCROLL)
|
|
{
|
|
// These are only good until the call to LayoutScrollArea.
|
|
nsRect scrolledRect = mHelper.GetScrolledRect();
|
|
|
|
// if the child is wider that the scroll area
|
|
// and we don't have a scrollbar add one.
|
|
if ((scrolledRect.width > mHelper.mScrollPort.width)
|
|
&& styles.mHorizontal == NS_STYLE_OVERFLOW_AUTO) {
|
|
|
|
if (!mHelper.mHasHorizontalScrollbar) {
|
|
// no scrollbar?
|
|
if (AddHorizontalScrollbar(aState, scrollbarBottom))
|
|
needsLayout = true;
|
|
|
|
// if we added a horizontal scrollbar and we did not have a vertical
|
|
// there is a chance that by adding the horizontal scrollbar we will
|
|
// suddenly need a vertical scrollbar. Is a special case but its
|
|
// important.
|
|
//if (!mHasVerticalScrollbar && scrolledRect.height > scrollAreaRect.height - sbSize.height)
|
|
// printf("****Gfx Scrollbar Special case hit!!*****\n");
|
|
|
|
}
|
|
} else {
|
|
// if the area is smaller or equal to and we have a scrollbar then
|
|
// remove it.
|
|
if (mHelper.mHasHorizontalScrollbar) {
|
|
RemoveHorizontalScrollbar(aState, scrollbarBottom);
|
|
needsLayout = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// we only need to set the rect. The inner child stays the same size.
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, oldScrollPosition);
|
|
needsLayout = false;
|
|
}
|
|
|
|
// get the preferred size of the scrollbars
|
|
nsSize hMinSize(0, 0);
|
|
if (mHelper.mHScrollbarBox && mHelper.mHasHorizontalScrollbar) {
|
|
GetScrollbarMetrics(aState, mHelper.mHScrollbarBox, &hMinSize, nullptr, false);
|
|
}
|
|
nsSize vMinSize(0, 0);
|
|
if (mHelper.mVScrollbarBox && mHelper.mHasVerticalScrollbar) {
|
|
GetScrollbarMetrics(aState, mHelper.mVScrollbarBox, &vMinSize, nullptr, true);
|
|
}
|
|
|
|
// Disable scrollbars that are too small
|
|
// Disable horizontal scrollbar first. If we have to disable only one
|
|
// scrollbar, we'd rather keep the vertical scrollbar.
|
|
// Note that we always give horizontal scrollbars their preferred height,
|
|
// never their min-height. So check that there's room for the preferred height.
|
|
if (mHelper.mHasHorizontalScrollbar &&
|
|
(hMinSize.width > clientRect.width - vMinSize.width
|
|
|| hMinSize.height > clientRect.height)) {
|
|
RemoveHorizontalScrollbar(aState, scrollbarBottom);
|
|
needsLayout = true;
|
|
}
|
|
// Now disable vertical scrollbar if necessary
|
|
if (mHelper.mHasVerticalScrollbar &&
|
|
(vMinSize.height > clientRect.height - hMinSize.height
|
|
|| vMinSize.width > clientRect.width)) {
|
|
RemoveVerticalScrollbar(aState, scrollbarRight);
|
|
needsLayout = true;
|
|
}
|
|
|
|
// we only need to set the rect. The inner child stays the same size.
|
|
if (needsLayout) {
|
|
nsBoxLayoutState resizeState(aState);
|
|
LayoutScrollArea(resizeState, oldScrollPosition);
|
|
}
|
|
|
|
if (!mHelper.mSupppressScrollbarUpdate) {
|
|
mHelper.LayoutScrollbars(aState, clientRect, oldScrollAreaBounds);
|
|
}
|
|
if (!mHelper.mPostedReflowCallback) {
|
|
// Make sure we'll try scrolling to restored position
|
|
PresContext()->PresShell()->PostReflowCallback(&mHelper);
|
|
mHelper.mPostedReflowCallback = true;
|
|
}
|
|
if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
|
|
mHelper.mHadNonInitialReflow = true;
|
|
}
|
|
|
|
mHelper.UpdateSticky();
|
|
|
|
// Set up overflow areas for block frames for the benefit of
|
|
// text-overflow.
|
|
nsIFrame* f = mHelper.mScrolledFrame->GetContentInsertionFrame();
|
|
if (nsLayoutUtils::GetAsBlock(f)) {
|
|
nsRect origRect = f->GetRect();
|
|
nsRect clippedRect = origRect;
|
|
clippedRect.MoveBy(mHelper.mScrollPort.TopLeft());
|
|
clippedRect.IntersectRect(clippedRect, mHelper.mScrollPort);
|
|
nsOverflowAreas overflow = f->GetOverflowAreas();
|
|
f->FinishAndStoreOverflow(overflow, clippedRect.Size());
|
|
clippedRect.MoveTo(origRect.TopLeft());
|
|
f->SetRect(clippedRect);
|
|
}
|
|
|
|
mHelper.UpdatePrevScrolledRect();
|
|
|
|
mHelper.PostOverflowEvent();
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::FinishReflowForScrollbar(nsIContent* aContent,
|
|
nscoord aMinXY, nscoord aMaxXY,
|
|
nscoord aCurPosXY,
|
|
nscoord aPageIncrement,
|
|
nscoord aIncrement)
|
|
{
|
|
// Scrollbars assume zero is the minimum position, so translate for them.
|
|
SetCoordAttribute(aContent, nsGkAtoms::curpos, aCurPosXY - aMinXY);
|
|
SetScrollbarEnabled(aContent, aMaxXY - aMinXY);
|
|
SetCoordAttribute(aContent, nsGkAtoms::maxpos, aMaxXY - aMinXY);
|
|
SetCoordAttribute(aContent, nsGkAtoms::pageincrement, aPageIncrement);
|
|
SetCoordAttribute(aContent, nsGkAtoms::increment, aIncrement);
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::ReflowFinished()
|
|
{
|
|
nsAutoScriptBlocker scriptBlocker;
|
|
mPostedReflowCallback = false;
|
|
|
|
ScrollToRestoredPosition();
|
|
|
|
// Clamp current scroll position to new bounds. Normally this won't
|
|
// do anything.
|
|
nsPoint currentScrollPos = GetScrollPosition();
|
|
ScrollToImpl(currentScrollPos, nsRect(currentScrollPos, nsSize(0, 0)));
|
|
if (!mAsyncScroll && !mAsyncSmoothMSDScroll) {
|
|
// We need to have mDestination track the current scroll position,
|
|
// in case it falls outside the new reflow area. mDestination is used
|
|
// by ScrollBy as its starting position.
|
|
mDestination = GetScrollPosition();
|
|
}
|
|
|
|
if (NS_SUBTREE_DIRTY(mOuter) || !mUpdateScrollbarAttributes)
|
|
return false;
|
|
|
|
mUpdateScrollbarAttributes = false;
|
|
|
|
// Update scrollbar attributes.
|
|
nsPresContext* presContext = mOuter->PresContext();
|
|
|
|
if (mMayHaveDirtyFixedChildren) {
|
|
mMayHaveDirtyFixedChildren = false;
|
|
nsIFrame* parentFrame = mOuter->GetParent();
|
|
for (nsIFrame* fixedChild =
|
|
parentFrame->GetFirstChild(nsIFrame::kFixedList);
|
|
fixedChild; fixedChild = fixedChild->GetNextSibling()) {
|
|
// force a reflow of the fixed child
|
|
presContext->PresShell()->
|
|
FrameNeedsReflow(fixedChild, nsIPresShell::eResize,
|
|
NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
}
|
|
}
|
|
|
|
nsRect scrolledContentRect = GetScrolledRect();
|
|
nsSize scrollClampingScrollPort = GetScrollPositionClampingScrollPortSize();
|
|
nscoord minX = scrolledContentRect.x;
|
|
nscoord maxX = scrolledContentRect.XMost() - scrollClampingScrollPort.width;
|
|
nscoord minY = scrolledContentRect.y;
|
|
nscoord maxY = scrolledContentRect.YMost() - scrollClampingScrollPort.height;
|
|
|
|
// Suppress handling of the curpos attribute changes we make here.
|
|
NS_ASSERTION(!mFrameIsUpdatingScrollbar, "We shouldn't be reentering here");
|
|
mFrameIsUpdatingScrollbar = true;
|
|
|
|
nsCOMPtr<nsIContent> vScroll =
|
|
mVScrollbarBox ? mVScrollbarBox->GetContent() : nullptr;
|
|
nsCOMPtr<nsIContent> hScroll =
|
|
mHScrollbarBox ? mHScrollbarBox->GetContent() : nullptr;
|
|
|
|
// Note, in some cases mOuter may get deleted while finishing reflow
|
|
// for scrollbars. XXXmats is this still true now that we have a script
|
|
// blocker in this scope? (if not, remove the weak frame checks below).
|
|
if (vScroll || hScroll) {
|
|
nsWeakFrame weakFrame(mOuter);
|
|
nsPoint scrollPos = GetScrollPosition();
|
|
nsSize lineScrollAmount = GetLineScrollAmount();
|
|
if (vScroll) {
|
|
const double kScrollMultiplier =
|
|
Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
|
|
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
|
|
nscoord increment = lineScrollAmount.height * kScrollMultiplier;
|
|
// We normally use (scrollArea.height - increment) for height
|
|
// of page scrolling. However, it is too small when
|
|
// increment is very large. (If increment is larger than
|
|
// scrollArea.height, direction of scrolling will be opposite).
|
|
// To avoid it, we use (float(scrollArea.height) * 0.8) as
|
|
// lower bound value of height of page scrolling. (bug 383267)
|
|
// XXX shouldn't we use GetPageScrollAmount here?
|
|
nscoord pageincrement = nscoord(scrollClampingScrollPort.height - increment);
|
|
nscoord pageincrementMin = nscoord(float(scrollClampingScrollPort.height) * 0.8);
|
|
FinishReflowForScrollbar(vScroll, minY, maxY, scrollPos.y,
|
|
std::max(pageincrement, pageincrementMin),
|
|
increment);
|
|
}
|
|
if (hScroll) {
|
|
const double kScrollMultiplier =
|
|
Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
|
|
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
|
|
nscoord increment = lineScrollAmount.width * kScrollMultiplier;
|
|
FinishReflowForScrollbar(hScroll, minX, maxX, scrollPos.x,
|
|
nscoord(float(scrollClampingScrollPort.width) * 0.8),
|
|
increment);
|
|
}
|
|
NS_ENSURE_TRUE(weakFrame.IsAlive(), false);
|
|
}
|
|
|
|
mFrameIsUpdatingScrollbar = false;
|
|
// We used to rely on the curpos attribute changes above to scroll the
|
|
// view. However, for scrolling to the left of the viewport, we
|
|
// rescale the curpos attribute, which means that operations like
|
|
// resizing the window while it is scrolled all the way to the left
|
|
// hold the curpos attribute constant at 0 while still requiring
|
|
// scrolling. So we suppress the effect of the changes above with
|
|
// mFrameIsUpdatingScrollbar and call CurPosAttributeChanged here.
|
|
// (It actually even works some of the time without this, thanks to
|
|
// nsSliderFrame::AttributeChanged's handling of maxpos, but not when
|
|
// we hide the scrollbar on a large size change, such as
|
|
// maximization.)
|
|
if (!mHScrollbarBox && !mVScrollbarBox)
|
|
return false;
|
|
CurPosAttributeChanged(mVScrollbarBox ? mVScrollbarBox->GetContent()
|
|
: mHScrollbarBox->GetContent());
|
|
return true;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::ReflowCallbackCanceled()
|
|
{
|
|
mPostedReflowCallback = false;
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::UpdateOverflow()
|
|
{
|
|
nsIScrollableFrame* sf = do_QueryFrame(mOuter);
|
|
ScrollbarStyles ss = sf->GetScrollbarStyles();
|
|
|
|
// Reflow when the change in overflow leads to one of our scrollbars
|
|
// changing or might require repositioning the scrolled content due to
|
|
// reduced extents.
|
|
nsRect scrolledRect = GetScrolledRect();
|
|
uint32_t overflowChange = GetOverflowChange(scrolledRect, mPrevScrolledRect);
|
|
mPrevScrolledRect = scrolledRect;
|
|
|
|
bool needReflow = false;
|
|
nsPoint scrollPosition = GetScrollPosition();
|
|
if (overflowChange & nsIScrollableFrame::HORIZONTAL) {
|
|
if (ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN || scrollPosition.x) {
|
|
needReflow = true;
|
|
}
|
|
}
|
|
if (overflowChange & nsIScrollableFrame::VERTICAL) {
|
|
if (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN || scrollPosition.y) {
|
|
needReflow = true;
|
|
}
|
|
}
|
|
|
|
if (needReflow) {
|
|
// If there are scrollbars, or we're not at the beginning of the pane,
|
|
// the scroll position may change. In this case, mark the frame as
|
|
// needing reflow. Don't use NS_FRAME_IS_DIRTY as dirty as that means
|
|
// we have to reflow the frame and all its descendants, and we don't
|
|
// have to do that here. Only this frame needs to be reflowed.
|
|
mOuter->PresContext()->PresShell()->FrameNeedsReflow(
|
|
mOuter, nsIPresShell::eResize, NS_FRAME_HAS_DIRTY_CHILDREN);
|
|
// Ensure that next time nsHTMLScrollFrame::Reflow runs, we don't skip
|
|
// updating the scrollbars. (Because the overflow area of the scrolled
|
|
// frame has probably just been updated, Reflow won't see it change.)
|
|
mSkippedScrollbarLayout = true;
|
|
return false; // reflowing will update overflow
|
|
}
|
|
PostOverflowEvent();
|
|
return mOuter->nsContainerFrame::UpdateOverflow();
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::UpdateSticky()
|
|
{
|
|
StickyScrollContainer* ssc = StickyScrollContainer::
|
|
GetStickyScrollContainerForScrollFrame(mOuter);
|
|
if (ssc) {
|
|
nsIScrollableFrame* scrollFrame = do_QueryFrame(mOuter);
|
|
ssc->UpdatePositions(scrollFrame->GetScrollPosition(), mOuter);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::UpdatePrevScrolledRect()
|
|
{
|
|
mPrevScrolledRect = GetScrolledRect();
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::AdjustScrollbarRectForResizer(
|
|
nsIFrame* aFrame, nsPresContext* aPresContext,
|
|
nsRect& aRect, bool aHasResizer, bool aVertical)
|
|
{
|
|
if ((aVertical ? aRect.width : aRect.height) == 0)
|
|
return;
|
|
|
|
// if a content resizer is present, use its size. Otherwise, check if the
|
|
// widget has a resizer.
|
|
nsRect resizerRect;
|
|
if (aHasResizer) {
|
|
resizerRect = mResizerBox->GetRect();
|
|
}
|
|
else {
|
|
nsPoint offset;
|
|
nsIWidget* widget = aFrame->GetNearestWidget(offset);
|
|
nsIntRect widgetRect;
|
|
if (!widget || !widget->ShowsResizeIndicator(&widgetRect))
|
|
return;
|
|
|
|
resizerRect = nsRect(aPresContext->DevPixelsToAppUnits(widgetRect.x) - offset.x,
|
|
aPresContext->DevPixelsToAppUnits(widgetRect.y) - offset.y,
|
|
aPresContext->DevPixelsToAppUnits(widgetRect.width),
|
|
aPresContext->DevPixelsToAppUnits(widgetRect.height));
|
|
}
|
|
|
|
if (resizerRect.Contains(aRect.BottomRight() - nsPoint(1, 1))) {
|
|
if (aVertical) {
|
|
aRect.height = std::max(0, resizerRect.y - aRect.y);
|
|
} else {
|
|
aRect.width = std::max(0, resizerRect.x - aRect.x);
|
|
}
|
|
} else if (resizerRect.Contains(aRect.BottomLeft() + nsPoint(1, -1))) {
|
|
if (aVertical) {
|
|
aRect.height = std::max(0, resizerRect.y - aRect.y);
|
|
} else {
|
|
nscoord xmost = aRect.XMost();
|
|
aRect.x = std::max(aRect.x, resizerRect.XMost());
|
|
aRect.width = xmost - aRect.x;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
AdjustOverlappingScrollbars(nsRect& aVRect, nsRect& aHRect)
|
|
{
|
|
if (aVRect.IsEmpty() || aHRect.IsEmpty())
|
|
return;
|
|
|
|
const nsRect oldVRect = aVRect;
|
|
const nsRect oldHRect = aHRect;
|
|
if (oldVRect.Contains(oldHRect.BottomRight() - nsPoint(1, 1))) {
|
|
aHRect.width = std::max(0, oldVRect.x - oldHRect.x);
|
|
} else if (oldVRect.Contains(oldHRect.BottomLeft() - nsPoint(0, 1))) {
|
|
nscoord overlap = std::min(oldHRect.width, oldVRect.XMost() - oldHRect.x);
|
|
aHRect.x += overlap;
|
|
aHRect.width -= overlap;
|
|
}
|
|
if (oldHRect.Contains(oldVRect.BottomRight() - nsPoint(1, 1))) {
|
|
aVRect.height = std::max(0, oldHRect.y - oldVRect.y);
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::LayoutScrollbars(nsBoxLayoutState& aState,
|
|
const nsRect& aContentArea,
|
|
const nsRect& aOldScrollArea)
|
|
{
|
|
NS_ASSERTION(!mSupppressScrollbarUpdate,
|
|
"This should have been suppressed");
|
|
|
|
nsIPresShell* presShell = mOuter->PresContext()->PresShell();
|
|
|
|
bool hasResizer = HasResizer();
|
|
bool scrollbarOnLeft = !IsScrollbarOnRight();
|
|
bool overlayScrollBarsWithZoom =
|
|
mIsRoot && LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) &&
|
|
presShell->IsScrollPositionClampingScrollPortSizeSet();
|
|
|
|
nsSize scrollPortClampingSize = mScrollPort.Size();
|
|
double res = 1.0;
|
|
if (overlayScrollBarsWithZoom) {
|
|
scrollPortClampingSize = presShell->GetScrollPositionClampingScrollPortSize();
|
|
res = presShell->GetCumulativeResolution();
|
|
}
|
|
|
|
// place the scrollcorner
|
|
if (mScrollCornerBox || mResizerBox) {
|
|
NS_PRECONDITION(!mScrollCornerBox || mScrollCornerBox->IsBoxFrame(), "Must be a box frame!");
|
|
|
|
nsRect r(0, 0, 0, 0);
|
|
if (aContentArea.x != mScrollPort.x || scrollbarOnLeft) {
|
|
// scrollbar (if any) on left
|
|
r.x = aContentArea.x;
|
|
r.width = mScrollPort.x - aContentArea.x;
|
|
NS_ASSERTION(r.width >= 0, "Scroll area should be inside client rect");
|
|
} else {
|
|
// scrollbar (if any) on right
|
|
r.width = aContentArea.XMost() - mScrollPort.XMost();
|
|
r.x = aContentArea.XMost() - r.width;
|
|
NS_ASSERTION(r.width >= 0, "Scroll area should be inside client rect");
|
|
}
|
|
if (aContentArea.y != mScrollPort.y) {
|
|
NS_ERROR("top scrollbars not supported");
|
|
} else {
|
|
// scrollbar (if any) on bottom
|
|
r.height = aContentArea.YMost() - mScrollPort.YMost();
|
|
r.y = aContentArea.YMost() - r.height;
|
|
NS_ASSERTION(r.height >= 0, "Scroll area should be inside client rect");
|
|
}
|
|
|
|
if (mScrollCornerBox) {
|
|
nsBoxFrame::LayoutChildAt(aState, mScrollCornerBox, r);
|
|
}
|
|
|
|
if (hasResizer) {
|
|
// if a resizer is present, get its size. Assume a default size of 15 pixels.
|
|
nscoord defaultSize = nsPresContext::CSSPixelsToAppUnits(15);
|
|
nsSize resizerMinSize = mResizerBox->GetMinSize(aState);
|
|
|
|
nscoord vScrollbarWidth = mVScrollbarBox ?
|
|
mVScrollbarBox->GetPrefSize(aState).width : defaultSize;
|
|
r.width = std::max(std::max(r.width, vScrollbarWidth), resizerMinSize.width);
|
|
if (aContentArea.x == mScrollPort.x && !scrollbarOnLeft) {
|
|
r.x = aContentArea.XMost() - r.width;
|
|
}
|
|
|
|
nscoord hScrollbarHeight = mHScrollbarBox ?
|
|
mHScrollbarBox->GetPrefSize(aState).height : defaultSize;
|
|
r.height = std::max(std::max(r.height, hScrollbarHeight), resizerMinSize.height);
|
|
if (aContentArea.y == mScrollPort.y) {
|
|
r.y = aContentArea.YMost() - r.height;
|
|
}
|
|
|
|
nsBoxFrame::LayoutChildAt(aState, mResizerBox, r);
|
|
}
|
|
else if (mResizerBox) {
|
|
// otherwise lay out the resizer with an empty rectangle
|
|
nsBoxFrame::LayoutChildAt(aState, mResizerBox, nsRect());
|
|
}
|
|
}
|
|
|
|
nsPresContext* presContext = mScrolledFrame->PresContext();
|
|
nsRect vRect;
|
|
if (mVScrollbarBox) {
|
|
NS_PRECONDITION(mVScrollbarBox->IsBoxFrame(), "Must be a box frame!");
|
|
vRect = mScrollPort;
|
|
if (overlayScrollBarsWithZoom) {
|
|
vRect.height = NSToCoordRound(res * scrollPortClampingSize.height);
|
|
}
|
|
vRect.width = aContentArea.width - mScrollPort.width;
|
|
vRect.x = scrollbarOnLeft ? aContentArea.x : mScrollPort.x + NSToCoordRound(res * scrollPortClampingSize.width);
|
|
if (mHasVerticalScrollbar) {
|
|
nsMargin margin;
|
|
mVScrollbarBox->GetMargin(margin);
|
|
vRect.Deflate(margin);
|
|
}
|
|
AdjustScrollbarRectForResizer(mOuter, presContext, vRect, hasResizer, true);
|
|
}
|
|
|
|
nsRect hRect;
|
|
if (mHScrollbarBox) {
|
|
NS_PRECONDITION(mHScrollbarBox->IsBoxFrame(), "Must be a box frame!");
|
|
hRect = mScrollPort;
|
|
if (overlayScrollBarsWithZoom) {
|
|
hRect.width = NSToCoordRound(res * scrollPortClampingSize.width);
|
|
}
|
|
hRect.height = aContentArea.height - mScrollPort.height;
|
|
hRect.y = mScrollPort.y + NSToCoordRound(res * scrollPortClampingSize.height);
|
|
if (mHasHorizontalScrollbar) {
|
|
nsMargin margin;
|
|
mHScrollbarBox->GetMargin(margin);
|
|
hRect.Deflate(margin);
|
|
}
|
|
AdjustScrollbarRectForResizer(mOuter, presContext, hRect, hasResizer, false);
|
|
}
|
|
|
|
if (!LookAndFeel::GetInt(LookAndFeel::eIntID_AllowOverlayScrollbarsOverlap)) {
|
|
AdjustOverlappingScrollbars(vRect, hRect);
|
|
}
|
|
if (mVScrollbarBox) {
|
|
nsBoxFrame::LayoutChildAt(aState, mVScrollbarBox, vRect);
|
|
}
|
|
if (mHScrollbarBox) {
|
|
nsBoxFrame::LayoutChildAt(aState, mHScrollbarBox, hRect);
|
|
}
|
|
|
|
// may need to update fixed position children of the viewport,
|
|
// if the client area changed size because of an incremental
|
|
// reflow of a descendant. (If the outer frame is dirty, the fixed
|
|
// children will be re-laid out anyway)
|
|
if (aOldScrollArea.Size() != mScrollPort.Size() &&
|
|
!(mOuter->GetStateBits() & NS_FRAME_IS_DIRTY) &&
|
|
mIsRoot) {
|
|
mMayHaveDirtyFixedChildren = true;
|
|
}
|
|
|
|
// post reflow callback to modify scrollbar attributes
|
|
mUpdateScrollbarAttributes = true;
|
|
if (!mPostedReflowCallback) {
|
|
aState.PresContext()->PresShell()->PostReflowCallback(this);
|
|
mPostedReflowCallback = true;
|
|
}
|
|
}
|
|
|
|
#if DEBUG
|
|
static bool ShellIsAlive(nsWeakPtr& aWeakPtr)
|
|
{
|
|
nsCOMPtr<nsIPresShell> shell(do_QueryReferent(aWeakPtr));
|
|
return !!shell;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ScrollFrameHelper::SetScrollbarEnabled(nsIContent* aContent, nscoord aMaxPos)
|
|
{
|
|
DebugOnly<nsWeakPtr> weakShell(
|
|
do_GetWeakReference(mOuter->PresContext()->PresShell()));
|
|
if (aMaxPos) {
|
|
aContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::disabled, true);
|
|
} else {
|
|
aContent->SetAttr(kNameSpaceID_None, nsGkAtoms::disabled,
|
|
NS_LITERAL_STRING("true"), true);
|
|
}
|
|
MOZ_ASSERT(ShellIsAlive(weakShell), "pres shell was destroyed by scrolling");
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::SetCoordAttribute(nsIContent* aContent, nsIAtom* aAtom,
|
|
nscoord aSize)
|
|
{
|
|
DebugOnly<nsWeakPtr> weakShell(
|
|
do_GetWeakReference(mOuter->PresContext()->PresShell()));
|
|
// convert to pixels
|
|
int32_t pixelSize = nsPresContext::AppUnitsToIntCSSPixels(aSize);
|
|
|
|
// only set the attribute if it changed.
|
|
|
|
nsAutoString newValue;
|
|
newValue.AppendInt(pixelSize);
|
|
|
|
if (aContent->AttrValueIs(kNameSpaceID_None, aAtom, newValue, eCaseMatters))
|
|
return;
|
|
|
|
nsWeakFrame weakFrame(mOuter);
|
|
nsCOMPtr<nsIContent> kungFuDeathGrip = aContent;
|
|
aContent->SetAttr(kNameSpaceID_None, aAtom, newValue, true);
|
|
MOZ_ASSERT(ShellIsAlive(weakShell), "pres shell was destroyed by scrolling");
|
|
if (!weakFrame.IsAlive()) {
|
|
return;
|
|
}
|
|
|
|
if (mScrollbarActivity) {
|
|
nsRefPtr<ScrollbarActivity> scrollbarActivity(mScrollbarActivity);
|
|
scrollbarActivity->ActivityOccurred();
|
|
}
|
|
}
|
|
|
|
static void
|
|
ReduceRadii(nscoord aXBorder, nscoord aYBorder,
|
|
nscoord& aXRadius, nscoord& aYRadius)
|
|
{
|
|
// In order to ensure that the inside edge of the border has no
|
|
// curvature, we need at least one of its radii to be zero.
|
|
if (aXRadius <= aXBorder || aYRadius <= aYBorder)
|
|
return;
|
|
|
|
// For any corner where we reduce the radii, preserve the corner's shape.
|
|
double ratio = std::max(double(aXBorder) / aXRadius,
|
|
double(aYBorder) / aYRadius);
|
|
aXRadius *= ratio;
|
|
aYRadius *= ratio;
|
|
}
|
|
|
|
/**
|
|
* Implement an override for nsIFrame::GetBorderRadii to ensure that
|
|
* the clipping region for the border radius does not clip the scrollbars.
|
|
*
|
|
* In other words, we require that the border radius be reduced until the
|
|
* inner border radius at the inner edge of the border is 0 wherever we
|
|
* have scrollbars.
|
|
*/
|
|
bool
|
|
ScrollFrameHelper::GetBorderRadii(const nsSize& aFrameSize,
|
|
const nsSize& aBorderArea,
|
|
Sides aSkipSides,
|
|
nscoord aRadii[8]) const
|
|
{
|
|
if (!mOuter->nsContainerFrame::GetBorderRadii(aFrameSize, aBorderArea,
|
|
aSkipSides, aRadii)) {
|
|
return false;
|
|
}
|
|
|
|
// Since we can use GetActualScrollbarSizes (rather than
|
|
// GetDesiredScrollbarSizes) since this doesn't affect reflow, we
|
|
// probably should.
|
|
nsMargin sb = GetActualScrollbarSizes();
|
|
nsMargin border = mOuter->GetUsedBorder();
|
|
|
|
if (sb.left > 0 || sb.top > 0) {
|
|
ReduceRadii(border.left, border.top,
|
|
aRadii[NS_CORNER_TOP_LEFT_X],
|
|
aRadii[NS_CORNER_TOP_LEFT_Y]);
|
|
}
|
|
|
|
if (sb.top > 0 || sb.right > 0) {
|
|
ReduceRadii(border.right, border.top,
|
|
aRadii[NS_CORNER_TOP_RIGHT_X],
|
|
aRadii[NS_CORNER_TOP_RIGHT_Y]);
|
|
}
|
|
|
|
if (sb.right > 0 || sb.bottom > 0) {
|
|
ReduceRadii(border.right, border.bottom,
|
|
aRadii[NS_CORNER_BOTTOM_RIGHT_X],
|
|
aRadii[NS_CORNER_BOTTOM_RIGHT_Y]);
|
|
}
|
|
|
|
if (sb.bottom > 0 || sb.left > 0) {
|
|
ReduceRadii(border.left, border.bottom,
|
|
aRadii[NS_CORNER_BOTTOM_LEFT_X],
|
|
aRadii[NS_CORNER_BOTTOM_LEFT_Y]);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::GetScrolledRect() const
|
|
{
|
|
nsRect result =
|
|
GetScrolledRectInternal(mScrolledFrame->GetScrollableOverflowRect(),
|
|
mScrollPort.Size());
|
|
|
|
if (result.width < mScrollPort.width) {
|
|
NS_WARNING("Scrolled rect smaller than scrollport?");
|
|
}
|
|
if (result.height < mScrollPort.height) {
|
|
NS_WARNING("Scrolled rect smaller than scrollport?");
|
|
}
|
|
return result;
|
|
}
|
|
|
|
nsRect
|
|
ScrollFrameHelper::GetScrolledRectInternal(const nsRect& aScrolledFrameOverflowArea,
|
|
const nsSize& aScrollPortSize) const
|
|
{
|
|
uint8_t frameDir = IsLTR() ? NS_STYLE_DIRECTION_LTR : NS_STYLE_DIRECTION_RTL;
|
|
|
|
// If the scrolled frame has unicode-bidi: plaintext, the paragraph
|
|
// direction set by the text content overrides the direction of the frame
|
|
if (mScrolledFrame->StyleTextReset()->mUnicodeBidi &
|
|
NS_STYLE_UNICODE_BIDI_PLAINTEXT) {
|
|
nsIFrame* childFrame = mScrolledFrame->GetFirstPrincipalChild();
|
|
if (childFrame) {
|
|
frameDir =
|
|
(nsBidiPresUtils::ParagraphDirection(childFrame) == NSBIDI_LTR)
|
|
? NS_STYLE_DIRECTION_LTR : NS_STYLE_DIRECTION_RTL;
|
|
}
|
|
}
|
|
|
|
return nsLayoutUtils::GetScrolledRect(mScrolledFrame,
|
|
aScrolledFrameOverflowArea,
|
|
aScrollPortSize, frameDir);
|
|
}
|
|
|
|
nsMargin
|
|
ScrollFrameHelper::GetActualScrollbarSizes() const
|
|
{
|
|
nsRect r = mOuter->GetPaddingRect() - mOuter->GetPosition();
|
|
|
|
return nsMargin(mScrollPort.y - r.y,
|
|
r.XMost() - mScrollPort.XMost(),
|
|
r.YMost() - mScrollPort.YMost(),
|
|
mScrollPort.x - r.x);
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible)
|
|
{
|
|
nsScrollbarFrame* scrollbar = do_QueryFrame(aScrollbar);
|
|
if (scrollbar) {
|
|
// See if we have a mediator.
|
|
nsIScrollbarMediator* mediator = scrollbar->GetScrollbarMediator();
|
|
if (mediator) {
|
|
// Inform the mediator of the visibility change.
|
|
mediator->VisibilityChanged(aVisible);
|
|
}
|
|
}
|
|
}
|
|
|
|
nscoord
|
|
ScrollFrameHelper::GetCoordAttribute(nsIFrame* aBox, nsIAtom* aAtom,
|
|
nscoord aDefaultValue,
|
|
nscoord* aRangeStart,
|
|
nscoord* aRangeLength)
|
|
{
|
|
if (aBox) {
|
|
nsIContent* content = aBox->GetContent();
|
|
|
|
nsAutoString value;
|
|
content->GetAttr(kNameSpaceID_None, aAtom, value);
|
|
if (!value.IsEmpty())
|
|
{
|
|
nsresult error;
|
|
// convert it to appunits
|
|
nscoord result = nsPresContext::CSSPixelsToAppUnits(value.ToInteger(&error));
|
|
nscoord halfPixel = nsPresContext::CSSPixelsToAppUnits(0.5f);
|
|
// Any nscoord value that would round to the attribute value when converted
|
|
// to CSS pixels is allowed.
|
|
*aRangeStart = result - halfPixel;
|
|
*aRangeLength = halfPixel*2 - 1;
|
|
return result;
|
|
}
|
|
}
|
|
|
|
// Only this exact default value is allowed.
|
|
*aRangeStart = aDefaultValue;
|
|
*aRangeLength = 0;
|
|
return aDefaultValue;
|
|
}
|
|
|
|
nsPresState*
|
|
ScrollFrameHelper::SaveState() const
|
|
{
|
|
nsIScrollbarMediator* mediator = do_QueryFrame(GetScrolledFrame());
|
|
if (mediator) {
|
|
// child handles its own scroll state, so don't bother saving state here
|
|
return nullptr;
|
|
}
|
|
|
|
// Don't store a scroll state if we never have been scrolled or restored
|
|
// a previous scroll state.
|
|
if (!mHasBeenScrolled && !mDidHistoryRestore) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsPresState* state = new nsPresState();
|
|
// Save mRestorePos instead of our actual current scroll position, if it's
|
|
// valid and we haven't moved since the last update of mLastPos (same check
|
|
// that ScrollToRestoredPosition uses). This ensures if a reframe occurs
|
|
// while we're in the process of loading content to scroll to a restored
|
|
// position, we'll keep trying after the reframe.
|
|
nsPoint pt = GetLogicalScrollPosition();
|
|
if (mRestorePos.y != -1 && pt == mLastPos) {
|
|
pt = mRestorePos;
|
|
}
|
|
state->SetScrollState(pt);
|
|
state->SetResolution(mResolution);
|
|
state->SetScaleToResolution(mScaleToResolution);
|
|
return state;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::RestoreState(nsPresState* aState)
|
|
{
|
|
mRestorePos = aState->GetScrollState();
|
|
mDidHistoryRestore = true;
|
|
mLastPos = mScrolledFrame ? GetLogicalScrollPosition() : nsPoint(0,0);
|
|
mResolution = aState->GetResolution();
|
|
mIsResolutionSet = true;
|
|
mScaleToResolution = aState->GetScaleToResolution();
|
|
|
|
// Scaling-to-resolution should only be used on root scroll frames.
|
|
MOZ_ASSERT(mIsRoot || !mScaleToResolution);
|
|
|
|
if (mIsRoot) {
|
|
nsIPresShell* presShell = mOuter->PresContext()->PresShell();
|
|
if (mScaleToResolution) {
|
|
presShell->SetResolutionAndScaleTo(mResolution);
|
|
} else {
|
|
presShell->SetResolution(mResolution);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::PostScrolledAreaEvent()
|
|
{
|
|
if (mScrolledAreaEvent.IsPending()) {
|
|
return;
|
|
}
|
|
mScrolledAreaEvent = new ScrolledAreaEvent(this);
|
|
nsContentUtils::AddScriptRunner(mScrolledAreaEvent.get());
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// ScrolledArea change event dispatch
|
|
|
|
NS_IMETHODIMP
|
|
ScrollFrameHelper::ScrolledAreaEvent::Run()
|
|
{
|
|
if (mHelper) {
|
|
mHelper->FireScrolledAreaEvent();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
ScrollFrameHelper::FireScrolledAreaEvent()
|
|
{
|
|
mScrolledAreaEvent.Forget();
|
|
|
|
InternalScrollAreaEvent event(true, eScrolledAreaChanged, nullptr);
|
|
nsPresContext *prescontext = mOuter->PresContext();
|
|
nsIContent* content = mOuter->GetContent();
|
|
|
|
event.mArea = mScrolledFrame->GetScrollableOverflowRectRelativeToParent();
|
|
|
|
nsIDocument *doc = content->GetCurrentDoc();
|
|
if (doc) {
|
|
EventDispatcher::Dispatch(doc, prescontext, &event, nullptr);
|
|
}
|
|
}
|
|
|
|
uint32_t
|
|
nsIScrollableFrame::GetPerceivedScrollingDirections() const
|
|
{
|
|
nscoord oneDevPixel = GetScrolledFrame()->PresContext()->AppUnitsPerDevPixel();
|
|
uint32_t directions = GetScrollbarVisibility();
|
|
nsRect scrollRange = GetScrollRange();
|
|
if (scrollRange.width >= oneDevPixel) {
|
|
directions |= HORIZONTAL;
|
|
}
|
|
if (scrollRange.height >= oneDevPixel) {
|
|
directions |= VERTICAL;
|
|
}
|
|
return directions;
|
|
}
|
|
|
|
/**
|
|
* Stores candidate snapping edges.
|
|
*/
|
|
class SnappingEdgeCallback {
|
|
public:
|
|
virtual void AddHorizontalEdge(nscoord aEdge) = 0;
|
|
virtual void AddVerticalEdge(nscoord aEdge) = 0;
|
|
virtual void AddHorizontalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval,
|
|
nscoord aOffset) = 0;
|
|
virtual void AddVerticalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval,
|
|
nscoord aOffset) = 0;
|
|
};
|
|
|
|
/**
|
|
* Keeps track of the current best edge to snap to. The criteria for
|
|
* adding an edge depends on the scrolling unit.
|
|
*/
|
|
class CalcSnapPoints : public SnappingEdgeCallback {
|
|
public:
|
|
CalcSnapPoints(nsIScrollableFrame::ScrollUnit aUnit,
|
|
const nsPoint& aDestination,
|
|
const nsPoint& aStartPos);
|
|
virtual void AddHorizontalEdge(nscoord aEdge) override;
|
|
virtual void AddVerticalEdge(nscoord aEdge) override;
|
|
virtual void AddHorizontalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval, nscoord aOffset)
|
|
override;
|
|
virtual void AddVerticalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval, nscoord aOffset)
|
|
override;
|
|
void AddEdge(nscoord aEdge,
|
|
nscoord aDestination,
|
|
nscoord aStartPos,
|
|
nscoord aScrollingDirection,
|
|
nscoord* aBestEdge,
|
|
bool* aEdgeFound);
|
|
void AddEdgeInterval(nscoord aInterval,
|
|
nscoord aMinPos,
|
|
nscoord aMaxPos,
|
|
nscoord aOffset,
|
|
nscoord aDestination,
|
|
nscoord aStartPos,
|
|
nscoord aScrollingDirection,
|
|
nscoord* aBestEdge,
|
|
bool* aEdgeFound);
|
|
nsPoint GetBestEdge() const;
|
|
protected:
|
|
nsIScrollableFrame::ScrollUnit mUnit;
|
|
nsPoint mDestination; // gives the position after scrolling but before snapping
|
|
nsPoint mStartPos; // gives the position before scrolling
|
|
nsIntPoint mScrollingDirection; // always -1, 0, or 1
|
|
nsPoint mBestEdge; // keeps track of the position of the current best edge
|
|
bool mHorizontalEdgeFound; // true if mBestEdge.x is storing a valid horizontal edge
|
|
bool mVerticalEdgeFound; // true if mBestEdge.y is storing a valid vertical edge
|
|
};
|
|
|
|
CalcSnapPoints::CalcSnapPoints(nsIScrollableFrame::ScrollUnit aUnit,
|
|
const nsPoint& aDestination,
|
|
const nsPoint& aStartPos)
|
|
{
|
|
mUnit = aUnit;
|
|
mDestination = aDestination;
|
|
mStartPos = aStartPos;
|
|
|
|
nsPoint direction = aDestination - aStartPos;
|
|
mScrollingDirection = nsIntPoint(0,0);
|
|
if (direction.x < 0) {
|
|
mScrollingDirection.x = -1;
|
|
}
|
|
if (direction.x > 0) {
|
|
mScrollingDirection.x = 1;
|
|
}
|
|
if (direction.y < 0) {
|
|
mScrollingDirection.y = -1;
|
|
}
|
|
if (direction.y > 0) {
|
|
mScrollingDirection.y = 1;
|
|
}
|
|
mBestEdge = aDestination;
|
|
mHorizontalEdgeFound = false;
|
|
mVerticalEdgeFound = false;
|
|
}
|
|
|
|
nsPoint
|
|
CalcSnapPoints::GetBestEdge() const
|
|
{
|
|
return nsPoint(mVerticalEdgeFound ? mBestEdge.x : mStartPos.x,
|
|
mHorizontalEdgeFound ? mBestEdge.y : mStartPos.y);
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddHorizontalEdge(nscoord aEdge)
|
|
{
|
|
AddEdge(aEdge, mDestination.y, mStartPos.y, mScrollingDirection.y, &mBestEdge.y,
|
|
&mHorizontalEdgeFound);
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddVerticalEdge(nscoord aEdge)
|
|
{
|
|
AddEdge(aEdge, mDestination.x, mStartPos.x, mScrollingDirection.x, &mBestEdge.x,
|
|
&mVerticalEdgeFound);
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddHorizontalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval, nscoord aOffset)
|
|
{
|
|
AddEdgeInterval(aInterval, aScrollRange.y, aScrollRange.YMost(), aOffset,
|
|
mDestination.y, mStartPos.y, mScrollingDirection.y,
|
|
&mBestEdge.y, &mHorizontalEdgeFound);
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddVerticalEdgeInterval(const nsRect &aScrollRange,
|
|
nscoord aInterval, nscoord aOffset)
|
|
{
|
|
AddEdgeInterval(aInterval, aScrollRange.x, aScrollRange.XMost(), aOffset,
|
|
mDestination.x, mStartPos.x, mScrollingDirection.x,
|
|
&mBestEdge.x, &mVerticalEdgeFound);
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddEdge(nscoord aEdge, nscoord aDestination, nscoord aStartPos,
|
|
nscoord aScrollingDirection, nscoord* aBestEdge,
|
|
bool *aEdgeFound)
|
|
{
|
|
// nsIScrollableFrame::DEVICE_PIXELS indicates that we are releasing a drag
|
|
// gesture or any other user input event that sets an absolute scroll
|
|
// position. In this case, scroll snapping is expected to travel in any
|
|
// direction. Otherwise, we will restrict the direction of the scroll
|
|
// snapping movement based on aScrollingDirection.
|
|
if (mUnit != nsIScrollableFrame::DEVICE_PIXELS) {
|
|
// Unless DEVICE_PIXELS, we only want to snap to points ahead of the
|
|
// direction we are scrolling
|
|
if (aScrollingDirection == 0) {
|
|
// The scroll direction is neutral - will not hit a snap point.
|
|
return;
|
|
}
|
|
// nsIScrollableFrame::WHOLE indicates that we are navigating to "home" or
|
|
// "end". In this case, we will always select the first or last snap point
|
|
// regardless of the direction of the scroll. Otherwise, we will select
|
|
// scroll snapping points only in the direction specified by
|
|
// aScrollingDirection.
|
|
if (mUnit != nsIScrollableFrame::WHOLE) {
|
|
// Direction of the edge from the current position (before scrolling) in
|
|
// the direction of scrolling
|
|
nscoord direction = (aEdge - aStartPos) * aScrollingDirection;
|
|
if (direction <= 0) {
|
|
// The edge is not in the direction we are scrolling, skip it.
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
if (!*aEdgeFound) {
|
|
*aBestEdge = aEdge;
|
|
*aEdgeFound = true;
|
|
return;
|
|
}
|
|
if (mUnit == nsIScrollableFrame::DEVICE_PIXELS ||
|
|
mUnit == nsIScrollableFrame::LINES) {
|
|
if (std::abs(aEdge - aDestination) < std::abs(*aBestEdge - aDestination)) {
|
|
*aBestEdge = aEdge;
|
|
}
|
|
} else if (mUnit == nsIScrollableFrame::PAGES) {
|
|
// distance to the edge from the scrolling destination in the direction of scrolling
|
|
nscoord overshoot = (aEdge - aDestination) * aScrollingDirection;
|
|
// distance to the current best edge from the scrolling destination in the direction of scrolling
|
|
nscoord curOvershoot = (*aBestEdge - aDestination) * aScrollingDirection;
|
|
|
|
// edges between the current position and the scrolling destination are favoured
|
|
// to preserve context
|
|
if (overshoot < 0 && (overshoot > curOvershoot || curOvershoot >= 0)) {
|
|
*aBestEdge = aEdge;
|
|
}
|
|
// if there are no edges between the current position and the scrolling destination
|
|
// the closest edge beyond the destination is used
|
|
if (overshoot > 0 && overshoot < curOvershoot) {
|
|
*aBestEdge = aEdge;
|
|
}
|
|
} else if (mUnit == nsIScrollableFrame::WHOLE) {
|
|
// the edge closest to the top/bottom/left/right is used, depending on scrolling direction
|
|
if (aScrollingDirection > 0 && aEdge > *aBestEdge) {
|
|
*aBestEdge = aEdge;
|
|
} else if (aScrollingDirection < 0 && aEdge < *aBestEdge) {
|
|
*aBestEdge = aEdge;
|
|
}
|
|
} else {
|
|
NS_ERROR("Invalid scroll mode");
|
|
return;
|
|
}
|
|
}
|
|
|
|
void
|
|
CalcSnapPoints::AddEdgeInterval(nscoord aInterval, nscoord aMinPos,
|
|
nscoord aMaxPos, nscoord aOffset,
|
|
nscoord aDestination, nscoord aStartPos,
|
|
nscoord aScrollingDirection,
|
|
nscoord* aBestEdge, bool *aEdgeFound)
|
|
{
|
|
if (aInterval == 0) {
|
|
// When interval is 0, there are no scroll snap points.
|
|
// Avoid division by zero and bail.
|
|
return;
|
|
}
|
|
|
|
// The only possible candidate interval snap points are the edges immediately
|
|
// surrounding aDestination.
|
|
|
|
// aDestination must be clamped to the scroll
|
|
// range in order to handle cases where the best matching snap point would
|
|
// result in scrolling out of bounds. This clamping must be prior to
|
|
// selecting the two interval edges.
|
|
nscoord clamped = std::max(std::min(aDestination, aMaxPos), aMinPos);
|
|
|
|
// Add each edge in the interval immediately before aTarget and after aTarget
|
|
// Do not add edges that are out of range.
|
|
nscoord r = (clamped + aOffset) % aInterval;
|
|
if (r < aMinPos) {
|
|
r += aInterval;
|
|
}
|
|
nscoord edge = clamped - r;
|
|
if (edge >= aMinPos && edge <= aMaxPos) {
|
|
AddEdge(edge, aDestination, aStartPos, aScrollingDirection, aBestEdge,
|
|
aEdgeFound);
|
|
}
|
|
edge += aInterval;
|
|
if (edge >= aMinPos && edge <= aMaxPos) {
|
|
AddEdge(edge, aDestination, aStartPos, aScrollingDirection, aBestEdge,
|
|
aEdgeFound);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ScrollSnapHelper(SnappingEdgeCallback& aCallback, nsIFrame* aFrame,
|
|
nsIFrame* aScrolledFrame,
|
|
const nsPoint &aScrollSnapDestination) {
|
|
nsIFrame::ChildListIterator childLists(aFrame);
|
|
for (; !childLists.IsDone(); childLists.Next()) {
|
|
nsFrameList::Enumerator childFrames(childLists.CurrentList());
|
|
for (; !childFrames.AtEnd(); childFrames.Next()) {
|
|
nsIFrame* f = childFrames.get();
|
|
|
|
const nsStyleDisplay* styleDisplay = f->StyleDisplay();
|
|
size_t coordCount = styleDisplay->mScrollSnapCoordinate.Length();
|
|
|
|
if (coordCount) {
|
|
nsRect frameRect = f->GetRect();
|
|
nsPoint offset = f->GetOffsetTo(aScrolledFrame);
|
|
nsRect edgesRect = nsRect(offset, frameRect.Size());
|
|
for (size_t coordNum = 0; coordNum < coordCount; coordNum++) {
|
|
const nsStyleBackground::Position &coordPosition =
|
|
f->StyleDisplay()->mScrollSnapCoordinate[coordNum];
|
|
nsPoint coordPoint = edgesRect.TopLeft() - aScrollSnapDestination;
|
|
coordPoint += nsPoint(coordPosition.mXPosition.mLength,
|
|
coordPosition.mYPosition.mLength);
|
|
if (coordPosition.mXPosition.mHasPercent) {
|
|
coordPoint.x += NSToCoordRound(coordPosition.mXPosition.mPercent *
|
|
frameRect.width);
|
|
}
|
|
if (coordPosition.mYPosition.mHasPercent) {
|
|
coordPoint.y += NSToCoordRound(coordPosition.mYPosition.mPercent *
|
|
frameRect.height);
|
|
}
|
|
|
|
aCallback.AddVerticalEdge(coordPoint.x);
|
|
aCallback.AddHorizontalEdge(coordPoint.y);
|
|
}
|
|
}
|
|
|
|
ScrollSnapHelper(aCallback, f, aScrolledFrame, aScrollSnapDestination);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::GetSnapPointForDestination(nsIScrollableFrame::ScrollUnit aUnit,
|
|
nsPoint aStartPos,
|
|
nsPoint &aDestination)
|
|
{
|
|
ScrollbarStyles styles = GetScrollbarStylesFromFrame();
|
|
if (styles.mScrollSnapTypeY == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
|
|
styles.mScrollSnapTypeX == NS_STYLE_SCROLL_SNAP_TYPE_NONE) {
|
|
return false;
|
|
}
|
|
|
|
nsSize scrollPortSize = mScrollPort.Size();
|
|
nsRect scrollRange = GetScrollRangeForClamping();
|
|
|
|
nsPoint destPos = nsPoint(styles.mScrollSnapDestinationX.mLength,
|
|
styles.mScrollSnapDestinationY.mLength);
|
|
if (styles.mScrollSnapDestinationX.mHasPercent) {
|
|
destPos.x += NSToCoordFloorClamped(styles.mScrollSnapDestinationX.mPercent
|
|
* scrollPortSize.width);
|
|
}
|
|
|
|
if (styles.mScrollSnapDestinationY.mHasPercent) {
|
|
destPos.y += NSToCoordFloorClamped(styles.mScrollSnapDestinationY.mPercent
|
|
* scrollPortSize.height);
|
|
}
|
|
|
|
CalcSnapPoints calcSnapPoints(aUnit, aDestination, aStartPos);
|
|
|
|
if (styles.mScrollSnapPointsX.GetUnit() != eStyleUnit_None) {
|
|
nscoord interval = nsRuleNode::ComputeCoordPercentCalc(styles.mScrollSnapPointsX,
|
|
scrollPortSize.width);
|
|
calcSnapPoints.AddVerticalEdgeInterval(scrollRange, interval, destPos.x);
|
|
}
|
|
if (styles.mScrollSnapPointsY.GetUnit() != eStyleUnit_None) {
|
|
nscoord interval = nsRuleNode::ComputeCoordPercentCalc(styles.mScrollSnapPointsY,
|
|
scrollPortSize.height);
|
|
calcSnapPoints.AddHorizontalEdgeInterval(scrollRange, interval, destPos.y);
|
|
}
|
|
|
|
ScrollSnapHelper(calcSnapPoints, mScrolledFrame, mScrolledFrame, destPos);
|
|
bool snapped = false;
|
|
nsPoint finalPos = calcSnapPoints.GetBestEdge();
|
|
nscoord proximityThreshold =
|
|
Preferences::GetInt("layout.css.scroll-snap.proximity-threshold", 0);
|
|
proximityThreshold = nsPresContext::CSSPixelsToAppUnits(proximityThreshold);
|
|
if (styles.mScrollSnapTypeY == NS_STYLE_SCROLL_SNAP_TYPE_PROXIMITY &&
|
|
std::abs(aDestination.y - finalPos.y) > proximityThreshold) {
|
|
finalPos.y = aDestination.y;
|
|
} else {
|
|
snapped = true;
|
|
}
|
|
if (styles.mScrollSnapTypeX == NS_STYLE_SCROLL_SNAP_TYPE_PROXIMITY &&
|
|
std::abs(aDestination.x - finalPos.x) > proximityThreshold) {
|
|
finalPos.x = aDestination.x;
|
|
} else {
|
|
snapped = true;
|
|
}
|
|
if (snapped) {
|
|
aDestination = finalPos;
|
|
}
|
|
return snapped;
|
|
}
|
|
|
|
bool
|
|
ScrollFrameHelper::UsesContainerScrolling() const
|
|
{
|
|
if (gfxPrefs::LayoutUseContainersForRootFrames()) {
|
|
return mIsRoot;
|
|
}
|
|
return false;
|
|
}
|