mirror of
https://github.com/mozilla/gecko-dev.git
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e8077ba4d8
Currently in ContainerState::SetupScrollingMetadata we call ComputeScrollMetadata for every layer and for each ASR in the layer's clip chain. If there are many sibling layers with the same clip then this is largely wasted work. This change makes us cache the most recently calculated result, and only recalculate if the ASR or clip is different. There was a small portion of ComputeScrollMetadata that must actually be executed for every layer and ASR in its clip chain. This has been moved to a separate function, ClipLayerToDisplayPort, that is still called every time. MozReview-Commit-ID: 7Zzblmimtc5 --HG-- extra : rebase_source : 85ee310ceaaff5fa8a1ccb513ffaf90904ace19d
1585 lines
61 KiB
C++
1585 lines
61 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#ifndef nsGfxScrollFrame_h___
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#define nsGfxScrollFrame_h___
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#include "mozilla/Attributes.h"
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#include "nsContainerFrame.h"
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#include "nsIAnonymousContentCreator.h"
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#include "nsBoxFrame.h"
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#include "nsIScrollableFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "nsIStatefulFrame.h"
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#include "nsThreadUtils.h"
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#include "nsIReflowCallback.h"
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#include "nsBoxLayoutState.h"
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#include "nsQueryFrame.h"
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#include "nsRefreshDriver.h"
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#include "nsExpirationTracker.h"
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#include "TextOverflow.h"
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#include "ScrollVelocityQueue.h"
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#include "mozilla/PresState.h"
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class nsPresContext;
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class nsIPresShell;
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class nsIContent;
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class nsAtom;
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class nsIScrollPositionListener;
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namespace mozilla {
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struct ScrollReflowInput;
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namespace layers {
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class Layer;
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class LayerManager;
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} // namespace layers
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namespace layout {
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class ScrollbarActivity;
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} // namespace layout
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class ScrollFrameHelper : public nsIReflowCallback {
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public:
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typedef nsIFrame::Sides Sides;
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typedef mozilla::CSSIntPoint CSSIntPoint;
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typedef mozilla::layout::ScrollbarActivity ScrollbarActivity;
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typedef mozilla::layers::FrameMetrics FrameMetrics;
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typedef mozilla::layers::ScrollSnapInfo ScrollSnapInfo;
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typedef mozilla::layers::Layer Layer;
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typedef mozilla::layers::LayerManager LayerManager;
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class AsyncScroll;
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class AsyncSmoothMSDScroll;
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ScrollFrameHelper(nsContainerFrame* aOuter, bool aIsRoot);
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~ScrollFrameHelper();
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mozilla::ScrollbarStyles GetScrollbarStylesFromFrame() const;
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// If a child frame was added or removed on the scrollframe,
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// reload our child frame list.
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// We need this if a scrollbar frame is recreated.
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void ReloadChildFrames();
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nsresult CreateAnonymousContent(
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nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements);
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void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, uint32_t aFilter);
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nsresult FireScrollPortEvent();
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void PostScrollEndEvent();
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void FireScrollEndEvent();
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void PostOverflowEvent();
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using PostDestroyData = nsIFrame::PostDestroyData;
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void Destroy(PostDestroyData& aPostDestroyData);
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists);
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void AppendScrollPartsTo(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists,
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bool aCreateLayer,
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bool aPositioned);
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bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
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Sides aSkipSides, nscoord aRadii[8]) const;
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// nsIReflowCallback
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virtual bool ReflowFinished() override;
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virtual void ReflowCallbackCanceled() override;
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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* Called when the 'curpos' attribute on one of the scrollbars changes.
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*/
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void CurPosAttributeChanged(nsIContent* aChild, bool aDoScroll = true);
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void PostScrollEvent();
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void FireScrollEvent();
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void PostScrolledAreaEvent();
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void FireScrolledAreaEvent();
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bool IsSmoothScrollingEnabled();
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/**
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* This class handles the dispatching of scroll events to content.
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*
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* Scroll events are posted to the refresh driver via
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* nsRefreshDriver::PostScrollEvent(), and they are fired during a refresh
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* driver tick, after running requestAnimationFrame callbacks but before
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* the style flush. This allows rAF callbacks to perform scrolling and have
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* that scrolling be reflected on the same refresh driver tick, while at
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* the same time allowing scroll event listeners to make style changes and
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* have those style changes be reflected on the same refresh driver tick.
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*
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* ScrollEvents cannot be refresh observers, because none of the existing
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* categories of refresh observers (FlushType::Style, FlushType::Layout,
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* and FlushType::Display) are run at the desired time in a refresh driver
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* tick. They behave similarly to refresh observers in that their presence
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* causes the refresh driver to tick.
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*
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* ScrollEvents are one-shot runnables; the refresh driver drops them after
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* running them.
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*/
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class ScrollEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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explicit ScrollEvent(ScrollFrameHelper* aHelper);
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void Revoke() { mHelper = nullptr; }
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private:
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ScrollFrameHelper* mHelper;
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};
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class ScrollEndEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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explicit ScrollEndEvent(ScrollFrameHelper* aHelper);
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void Revoke() { mHelper = nullptr; }
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private:
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ScrollFrameHelper* mHelper;
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};
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class AsyncScrollPortEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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explicit AsyncScrollPortEvent(ScrollFrameHelper* helper)
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: Runnable("ScrollFrameHelper::AsyncScrollPortEvent")
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, mHelper(helper)
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{
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}
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void Revoke() { mHelper = nullptr; }
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private:
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ScrollFrameHelper *mHelper;
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};
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class ScrolledAreaEvent : public Runnable {
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public:
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NS_DECL_NSIRUNNABLE
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explicit ScrolledAreaEvent(ScrollFrameHelper* helper)
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: Runnable("ScrollFrameHelper::ScrolledAreaEvent")
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, mHelper(helper)
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{
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}
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void Revoke() { mHelper = nullptr; }
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private:
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ScrollFrameHelper *mHelper;
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};
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void FinishReflowForScrollbar(mozilla::dom::Element* aElement,
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nscoord aMinXY, nscoord aMaxXY,
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nscoord aCurPosXY, nscoord aPageIncrement,
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nscoord aIncrement);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void SetScrollbarEnabled(mozilla::dom::Element* aElement, nscoord aMaxPos);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void SetCoordAttribute(mozilla::dom::Element* aElement,
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nsAtom* aAtom,
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nscoord aSize);
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nscoord GetCoordAttribute(nsIFrame* aFrame, nsAtom* aAtom, nscoord aDefaultValue,
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nscoord* aRangeStart, nscoord* aRangeLength);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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* Update scrollbar curpos attributes to reflect current scroll position
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*/
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void UpdateScrollbarPosition();
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nsRect GetScrollPortRect() const { return mScrollPort; }
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nsPoint GetScrollPosition() const {
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return mScrollPort.TopLeft() - mScrolledFrame->GetPosition();
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}
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/**
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* For LTR frames, the logical scroll position is the offset of the top left
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* corner of the frame from the top left corner of the scroll port (same as
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* GetScrollPosition).
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* For RTL frames, it is the offset of the top right corner of the frame from
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* the top right corner of the scroll port
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*/
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nsPoint GetLogicalScrollPosition() const {
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nsPoint pt;
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pt.x = IsPhysicalLTR() ?
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mScrollPort.x - mScrolledFrame->GetPosition().x :
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mScrollPort.XMost() - mScrolledFrame->GetRect().XMost();
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pt.y = mScrollPort.y - mScrolledFrame->GetPosition().y;
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return pt;
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}
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nsRect GetScrollRange() const;
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// Get the scroll range assuming the scrollport has size (aWidth, aHeight).
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nsRect GetScrollRange(nscoord aWidth, nscoord aHeight) const;
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nsSize GetScrollPositionClampingScrollPortSize() const;
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void ScrollSnap(nsIScrollableFrame::ScrollMode aMode = nsIScrollableFrame::SMOOTH_MSD);
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void ScrollSnap(const nsPoint &aDestination,
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nsIScrollableFrame::ScrollMode aMode = nsIScrollableFrame::SMOOTH_MSD);
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protected:
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nsRect GetScrollRangeForClamping() const;
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public:
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static void AsyncScrollCallback(ScrollFrameHelper* aInstance,
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mozilla::TimeStamp aTime);
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static void AsyncSmoothMSDScrollCallback(ScrollFrameHelper* aInstance,
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mozilla::TimeDuration aDeltaTime);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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* aRange is the range of allowable scroll positions around the desired
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* aScrollPosition. Null means only aScrollPosition is allowed.
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* This is a closed-ended range --- aRange.XMost()/aRange.YMost() are allowed.
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*/
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void ScrollTo(nsPoint aScrollPosition, nsIScrollableFrame::ScrollMode aMode,
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const nsRect* aRange = nullptr,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP) {
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ScrollToWithOrigin(aScrollPosition, aMode, nsGkAtoms::other, aRange,
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aSnap);
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}
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
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nsIScrollableFrame::ScrollMode aMode
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= nsIScrollableFrame::INSTANT);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition,
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nsAtom* aOrigin = nullptr);
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CSSIntPoint GetScrollPositionCSSPixels();
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToImpl(nsPoint aScrollPosition, const nsRect& aRange, nsAtom* aOrigin = nullptr);
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void ScrollVisual();
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollBy(nsIntPoint aDelta, nsIScrollableFrame::ScrollUnit aUnit,
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nsIScrollableFrame::ScrollMode aMode, nsIntPoint* aOverflow,
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nsAtom* aOrigin = nullptr,
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nsIScrollableFrame::ScrollMomentum aMomentum = nsIScrollableFrame::NOT_MOMENTUM,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP);
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/**
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* @note This method might destroy the frame, pres shell and other objects.
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*/
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void ScrollToRestoredPosition();
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enum class LoadingState {
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Loading,
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Stopped,
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Loaded
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};
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LoadingState GetPageLoadingState();
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/**
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* GetSnapPointForDestination determines which point to snap to after
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* scrolling. aStartPos gives the position before scrolling and aDestination
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* gives the position after scrolling, with no snapping. Behaviour is
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* dependent on the value of aUnit.
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* Returns true if a suitable snap point could be found and aDestination has
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* been updated to a valid snapping position.
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*/
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bool GetSnapPointForDestination(nsIScrollableFrame::ScrollUnit aUnit,
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nsPoint aStartPos,
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nsPoint &aDestination);
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nsSize GetLineScrollAmount() const;
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nsSize GetPageScrollAmount() const;
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mozilla::UniquePtr<mozilla::PresState> SaveState() const;
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void RestoreState(mozilla::PresState* aState);
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nsIFrame* GetScrolledFrame() const { return mScrolledFrame; }
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nsIFrame* GetScrollbarBox(bool aVertical) const {
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return aVertical ? mVScrollbarBox : mHScrollbarBox;
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}
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void AddScrollPositionListener(nsIScrollPositionListener* aListener) {
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mListeners.AppendElement(aListener);
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}
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void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) {
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mListeners.RemoveElement(aListener);
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}
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static void SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible);
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/**
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* GetScrolledRect is designed to encapsulate deciding which
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* directions of overflow should be reachable by scrolling and which
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* should not. Callers should NOT depend on it having any particular
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* behavior (although nsXULScrollFrame currently does).
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*
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* This should only be called when the scrolled frame has been
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* reflowed with the scroll port size given in mScrollPort.
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*
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* Currently it allows scrolling down and to the right for
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* nsHTMLScrollFrames with LTR directionality and for all
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* nsXULScrollFrames, and allows scrolling down and to the left for
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* nsHTMLScrollFrames with RTL directionality.
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*/
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nsRect GetScrolledRect() const;
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/**
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* GetUnsnappedScrolledRectInternal is designed to encapsulate deciding which
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* directions of overflow should be reachable by scrolling and which
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* should not. Callers should NOT depend on it having any particular
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* behavior (although nsXULScrollFrame currently does).
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*
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* Currently it allows scrolling down and to the right for
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* nsHTMLScrollFrames with LTR directionality and for all
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* nsXULScrollFrames, and allows scrolling down and to the left for
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* nsHTMLScrollFrames with RTL directionality.
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*/
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nsRect GetUnsnappedScrolledRectInternal(const nsRect& aScrolledOverflowArea,
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const nsSize& aScrollPortSize) const;
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uint32_t GetScrollbarVisibility() const {
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return (mHasVerticalScrollbar ? nsIScrollableFrame::VERTICAL : 0) |
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(mHasHorizontalScrollbar ? nsIScrollableFrame::HORIZONTAL : 0);
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}
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nsMargin GetActualScrollbarSizes() const;
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nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
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nscoord GetNondisappearingScrollbarWidth(nsBoxLayoutState* aState,
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mozilla::WritingMode aVerticalWM);
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bool IsPhysicalLTR() const {
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WritingMode wm = GetFrameForDir()->GetWritingMode();
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return wm.IsVertical() ? wm.IsVerticalLR() : wm.IsBidiLTR();
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}
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bool IsBidiLTR() const {
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nsIFrame* frame = GetFrameForDir();
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return frame->StyleVisibility()->mDirection == NS_STYLE_DIRECTION_LTR;
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}
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private:
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nsIFrame* GetFrameForDir() const; // helper for Is{Physical,Bidi}LTR to find
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// the frame whose directionality we use
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public:
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bool IsScrollbarOnRight() const;
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bool IsScrollingActive(nsDisplayListBuilder* aBuilder) const;
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bool IsMaybeAsynchronouslyScrolled() const {
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// If this is true, then we'll build an ASR, and that's what we want
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// to know I think.
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return mWillBuildScrollableLayer;
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}
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bool IsMaybeScrollingActive() const;
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bool IsProcessingAsyncScroll() const {
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return mAsyncScroll != nullptr || mAsyncSmoothMSDScroll != nullptr;
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}
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void ResetScrollPositionForLayerPixelAlignment()
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{
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mScrollPosForLayerPixelAlignment = GetScrollPosition();
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}
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bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas);
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void UpdateSticky();
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void UpdatePrevScrolledRect();
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bool IsRectNearlyVisible(const nsRect& aRect) const;
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nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const;
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// adjust the scrollbar rectangle aRect to account for any visible resizer.
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// aHasResizer specifies if there is a content resizer, however this method
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// will also check if a widget resizer is present as well.
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void AdjustScrollbarRectForResizer(nsIFrame* aFrame, nsPresContext* aPresContext,
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nsRect& aRect, bool aHasResizer, bool aVertical);
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// returns true if a resizer should be visible
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bool HasResizer() { return mResizerBox && !mCollapsedResizer; }
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void LayoutScrollbars(nsBoxLayoutState& aState,
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const nsRect& aContentArea,
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const nsRect& aOldScrollArea);
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bool IsIgnoringViewportClipping() const;
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void MarkScrollbarsDirtyForReflow() const;
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bool ShouldClampScrollPosition() const;
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bool IsAlwaysActive() const;
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void MarkRecentlyScrolled();
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void MarkNotRecentlyScrolled();
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nsExpirationState* GetExpirationState() { return &mActivityExpirationState; }
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void SetTransformingByAPZ(bool aTransforming) {
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if (mTransformingByAPZ && !aTransforming) {
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PostScrollEndEvent();
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}
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mTransformingByAPZ = aTransforming;
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if (!mozilla::css::TextOverflow::HasClippedOverflow(mOuter)) {
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// If the block has some text-overflow stuff we should kick off a paint
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// because we have special behaviour for it when APZ scrolling is active.
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mOuter->SchedulePaint();
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}
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}
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bool IsTransformingByAPZ() const {
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return mTransformingByAPZ;
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}
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void SetScrollableByAPZ(bool aScrollable);
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void SetZoomableByAPZ(bool aZoomable);
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void SetHasOutOfFlowContentInsideFilter();
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bool UsesContainerScrolling() const;
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ScrollSnapInfo GetScrollSnapInfo() const;
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bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
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nsRect* aVisibleRect,
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nsRect* aDirtyRect,
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bool aSetBase,
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bool* aDirtyRectHasBeenOverriden = nullptr);
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void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort);
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bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(nsRect* aDisplayPort);
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bool AllowDisplayPortExpiration();
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void TriggerDisplayPortExpiration();
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void ResetDisplayPortExpiryTimer();
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void ScheduleSyntheticMouseMove();
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static void ScrollActivityCallback(nsITimer *aTimer, void* anInstance);
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void HandleScrollbarStyleSwitching();
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nsAtom* LastScrollOrigin() const { return mLastScrollOrigin; }
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void AllowScrollOriginDowngrade() { mAllowScrollOriginDowngrade = true; }
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nsAtom* LastSmoothScrollOrigin() const { return mLastSmoothScrollOrigin; }
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uint32_t CurrentScrollGeneration() const { return mScrollGeneration; }
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nsPoint LastScrollDestination() const { return mDestination; }
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void ResetScrollInfoIfGeneration(uint32_t aGeneration) {
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if (aGeneration == mScrollGeneration) {
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mLastScrollOrigin = nullptr;
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mLastSmoothScrollOrigin = nullptr;
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}
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}
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bool WantAsyncScroll() const;
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Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
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LayerManager* aLayerManager,
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const nsIFrame* aContainerReferenceFrame,
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const ContainerLayerParameters& aParameters,
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const mozilla::DisplayItemClip* aClip) const;
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void ClipLayerToDisplayPort(Layer* aLayer,
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const mozilla::DisplayItemClip* aClip,
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const ContainerLayerParameters& aParameters) const;
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// nsIScrollbarMediator
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void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
void RepeatButtonScroll(nsScrollbarFrame* aScrollbar);
|
|
void ThumbMoved(nsScrollbarFrame* aScrollbar,
|
|
nscoord aOldPos,
|
|
nscoord aNewPos);
|
|
void ScrollbarReleased(nsScrollbarFrame* aScrollbar);
|
|
void ScrollByUnit(nsScrollbarFrame* aScrollbar,
|
|
nsIScrollableFrame::ScrollMode aMode,
|
|
int32_t aDirection,
|
|
nsIScrollableFrame::ScrollUnit aUnit,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
bool ShouldSuppressScrollbarRepaints() const {
|
|
return mSuppressScrollbarRepaints;
|
|
}
|
|
|
|
bool DragScroll(WidgetEvent* aEvent);
|
|
|
|
void AsyncScrollbarDragRejected();
|
|
|
|
bool IsRootScrollFrameOfDocument() const { return mIsRoot; }
|
|
|
|
// owning references to the nsIAnonymousContentCreator-built content
|
|
nsCOMPtr<mozilla::dom::Element> mHScrollbarContent;
|
|
nsCOMPtr<mozilla::dom::Element> mVScrollbarContent;
|
|
nsCOMPtr<mozilla::dom::Element> mScrollCornerContent;
|
|
nsCOMPtr<mozilla::dom::Element> mResizerContent;
|
|
|
|
RefPtr<ScrollEvent> mScrollEvent;
|
|
RefPtr<ScrollEndEvent> mScrollEndEvent;
|
|
nsRevocableEventPtr<AsyncScrollPortEvent> mAsyncScrollPortEvent;
|
|
nsRevocableEventPtr<ScrolledAreaEvent> mScrolledAreaEvent;
|
|
nsIFrame* mHScrollbarBox;
|
|
nsIFrame* mVScrollbarBox;
|
|
nsIFrame* mScrolledFrame;
|
|
nsIFrame* mScrollCornerBox;
|
|
nsIFrame* mResizerBox;
|
|
nsContainerFrame* mOuter;
|
|
const nsIFrame* mReferenceFrameDuringPainting;
|
|
RefPtr<AsyncScroll> mAsyncScroll;
|
|
RefPtr<AsyncSmoothMSDScroll> mAsyncSmoothMSDScroll;
|
|
RefPtr<ScrollbarActivity> mScrollbarActivity;
|
|
nsTArray<nsIScrollPositionListener*> mListeners;
|
|
nsAtom* mLastScrollOrigin;
|
|
bool mAllowScrollOriginDowngrade;
|
|
nsAtom* mLastSmoothScrollOrigin;
|
|
Maybe<nsPoint> mApzSmoothScrollDestination;
|
|
uint32_t mScrollGeneration;
|
|
nsRect mScrollPort;
|
|
// Where we're currently scrolling to, if we're scrolling asynchronously.
|
|
// If we're not in the middle of an asynchronous scroll then this is
|
|
// just the current scroll position. ScrollBy will choose its
|
|
// destination based on this value.
|
|
nsPoint mDestination;
|
|
nsPoint mScrollPosAtLastPaint;
|
|
|
|
// A goal position to try to scroll to as content loads. As long as mLastPos
|
|
// matches the current logical scroll position, we try to scroll to mRestorePos
|
|
// after every reflow --- because after each time content is loaded/added to the
|
|
// scrollable element, there will be a reflow.
|
|
nsPoint mRestorePos;
|
|
// The last logical position we scrolled to while trying to restore mRestorePos, or
|
|
// 0,0 when this is a new frame. Set to -1,-1 once we've scrolled for any reason
|
|
// other than trying to restore mRestorePos.
|
|
nsPoint mLastPos;
|
|
|
|
nsExpirationState mActivityExpirationState;
|
|
|
|
nsCOMPtr<nsITimer> mScrollActivityTimer;
|
|
nsPoint mScrollPosForLayerPixelAlignment;
|
|
|
|
// The scroll position where we last updated frame visibility.
|
|
nsPoint mLastUpdateFramesPos;
|
|
bool mHadDisplayPortAtLastFrameUpdate;
|
|
nsRect mDisplayPortAtLastFrameUpdate;
|
|
|
|
nsRect mPrevScrolledRect;
|
|
|
|
FrameMetrics::ViewID mScrollParentID;
|
|
|
|
// Timer to remove the displayport some time after scrolling has stopped
|
|
nsCOMPtr<nsITimer> mDisplayPortExpiryTimer;
|
|
|
|
bool mNeverHasVerticalScrollbar:1;
|
|
bool mNeverHasHorizontalScrollbar:1;
|
|
bool mHasVerticalScrollbar:1;
|
|
bool mHasHorizontalScrollbar:1;
|
|
bool mFrameIsUpdatingScrollbar:1;
|
|
bool mDidHistoryRestore:1;
|
|
// Is this the scrollframe for the document's viewport?
|
|
bool mIsRoot:1;
|
|
// True if we should clip all descendants, false if we should only clip
|
|
// descendants for which we are the containing block.
|
|
bool mClipAllDescendants:1;
|
|
// If true, don't try to layout the scrollbars in Reflow(). This can be
|
|
// useful if multiple passes are involved, because we don't want to place the
|
|
// scrollbars at the wrong size.
|
|
bool mSuppressScrollbarUpdate:1;
|
|
// If true, we skipped a scrollbar layout due to mSuppressScrollbarUpdate
|
|
// being set at some point. That means we should lay out scrollbars even if
|
|
// it might not strictly be needed next time mSuppressScrollbarUpdate is
|
|
// false.
|
|
bool mSkippedScrollbarLayout:1;
|
|
|
|
bool mHadNonInitialReflow:1;
|
|
// State used only by PostScrollEvents so we know
|
|
// which overflow states have changed.
|
|
bool mHorizontalOverflow:1;
|
|
bool mVerticalOverflow:1;
|
|
bool mPostedReflowCallback:1;
|
|
bool mMayHaveDirtyFixedChildren:1;
|
|
// If true, need to actually update our scrollbar attributes in the
|
|
// reflow callback.
|
|
bool mUpdateScrollbarAttributes:1;
|
|
// If true, we should be prepared to scroll using this scrollframe
|
|
// by placing descendant content into its own layer(s)
|
|
bool mHasBeenScrolledRecently:1;
|
|
// If true, the resizer is collapsed and not displayed
|
|
bool mCollapsedResizer:1;
|
|
|
|
// If true, the scroll frame should always be active because we always build
|
|
// a scrollable layer. Used for asynchronous scrolling.
|
|
bool mWillBuildScrollableLayer:1;
|
|
|
|
// If true, the scroll frame is an ancestor of other scrolling frames, so
|
|
// we shouldn't expire the displayport on this scrollframe unless those
|
|
// descendant scrollframes also have their displayports removed.
|
|
bool mIsScrollParent:1;
|
|
|
|
// Whether we are the root scroll frame that is used for containerful
|
|
// scrolling with a display port. If true, the scrollable frame
|
|
// shouldn't attach frame metrics to its layers because the container
|
|
// will already have the necessary frame metrics.
|
|
bool mIsScrollableLayerInRootContainer:1;
|
|
|
|
// If true, add clipping in ScrollFrameHelper::ClipLayerToDisplayPort.
|
|
bool mAddClipRectToLayer:1;
|
|
|
|
// True if this frame has been scrolled at least once
|
|
bool mHasBeenScrolled:1;
|
|
|
|
// True if the events synthesized by OSX to produce momentum scrolling should
|
|
// be ignored. Reset when the next real, non-synthesized scroll event occurs.
|
|
bool mIgnoreMomentumScroll:1;
|
|
|
|
// True if the APZ is in the process of async-transforming this scrollframe,
|
|
// (as best as we can tell on the main thread, anyway).
|
|
bool mTransformingByAPZ:1;
|
|
|
|
// True if APZ can scroll this frame asynchronously (i.e. it has an APZC
|
|
// set up for this frame and it's not a scrollinfo layer).
|
|
bool mScrollableByAPZ:1;
|
|
|
|
// True if the APZ is allowed to zoom this scrollframe.
|
|
bool mZoomableByAPZ:1;
|
|
|
|
// True if the scroll frame contains out-of-flow content and is inside
|
|
// a CSS filter.
|
|
bool mHasOutOfFlowContentInsideFilter:1;
|
|
|
|
// True if we don't want the scrollbar to repaint itself right now.
|
|
bool mSuppressScrollbarRepaints:1;
|
|
|
|
mozilla::layout::ScrollVelocityQueue mVelocityQueue;
|
|
|
|
protected:
|
|
class AutoScrollbarRepaintSuppression;
|
|
friend class AutoScrollbarRepaintSuppression;
|
|
class AutoScrollbarRepaintSuppression {
|
|
public:
|
|
AutoScrollbarRepaintSuppression(ScrollFrameHelper* aHelper, bool aSuppress)
|
|
: mHelper(aHelper)
|
|
, mOldSuppressValue(aHelper->mSuppressScrollbarRepaints)
|
|
{
|
|
mHelper->mSuppressScrollbarRepaints = aSuppress;
|
|
}
|
|
|
|
~AutoScrollbarRepaintSuppression()
|
|
{
|
|
mHelper->mSuppressScrollbarRepaints = mOldSuppressValue;
|
|
}
|
|
|
|
private:
|
|
ScrollFrameHelper* mHelper;
|
|
bool mOldSuppressValue;
|
|
};
|
|
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
void ScrollToWithOrigin(nsPoint aScrollPosition,
|
|
nsIScrollableFrame::ScrollMode aMode,
|
|
nsAtom *aOrigin, // nullptr indicates "other" origin
|
|
const nsRect* aRange,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
|
|
void CompleteAsyncScroll(const nsRect &aRange, nsAtom* aOrigin = nullptr);
|
|
|
|
bool HasPluginFrames();
|
|
bool HasPerspective() const;
|
|
bool HasBgAttachmentLocal() const;
|
|
uint8_t GetScrolledFrameDir() const;
|
|
|
|
static void EnsureFrameVisPrefsCached();
|
|
static bool sFrameVisPrefsCached;
|
|
// The number of scrollports wide/high to expand when tracking frame visibility.
|
|
static uint32_t sHorzExpandScrollPort;
|
|
static uint32_t sVertExpandScrollPort;
|
|
// The fraction of the scrollport we allow to scroll by before we schedule
|
|
// an update of frame visibility.
|
|
static int32_t sHorzScrollFraction;
|
|
static int32_t sVertScrollFraction;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
/**
|
|
* The scroll frame creates and manages the scrolling view
|
|
*
|
|
* It only supports having a single child frame that typically is an area
|
|
* frame, but doesn't have to be. The child frame must have a view, though
|
|
*
|
|
* Scroll frames don't support incremental changes, i.e. you can't replace
|
|
* or remove the scrolled frame
|
|
*/
|
|
class nsHTMLScrollFrame : public nsContainerFrame,
|
|
public nsIScrollableFrame,
|
|
public nsIAnonymousContentCreator,
|
|
public nsIStatefulFrame {
|
|
public:
|
|
typedef mozilla::ScrollFrameHelper ScrollFrameHelper;
|
|
typedef mozilla::CSSIntPoint CSSIntPoint;
|
|
typedef mozilla::ScrollReflowInput ScrollReflowInput;
|
|
friend nsHTMLScrollFrame* NS_NewHTMLScrollFrame(nsIPresShell* aPresShell,
|
|
ComputedStyle* aStyle,
|
|
bool aIsRoot);
|
|
|
|
NS_DECL_QUERYFRAME
|
|
NS_DECL_FRAMEARENA_HELPERS(nsHTMLScrollFrame)
|
|
|
|
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override {
|
|
mHelper.BuildDisplayList(aBuilder, aLists);
|
|
}
|
|
|
|
bool TryLayout(ScrollReflowInput* aState,
|
|
ReflowOutput* aKidMetrics,
|
|
bool aAssumeVScroll, bool aAssumeHScroll,
|
|
bool aForce);
|
|
bool ScrolledContentDependsOnHeight(ScrollReflowInput* aState);
|
|
void ReflowScrolledFrame(ScrollReflowInput* aState,
|
|
bool aAssumeHScroll,
|
|
bool aAssumeVScroll,
|
|
ReflowOutput* aMetrics,
|
|
bool aFirstPass);
|
|
void ReflowContents(ScrollReflowInput* aState,
|
|
const ReflowOutput& aDesiredSize);
|
|
void PlaceScrollArea(ScrollReflowInput& aState,
|
|
const nsPoint& aScrollPosition);
|
|
nscoord GetIntrinsicVScrollbarWidth(gfxContext *aRenderingContext);
|
|
|
|
virtual bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
|
|
Sides aSkipSides, nscoord aRadii[8]) const override {
|
|
return mHelper.GetBorderRadii(aFrameSize, aBorderArea, aSkipSides, aRadii);
|
|
}
|
|
|
|
virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
|
|
virtual nscoord GetPrefISize(gfxContext *aRenderingContext) override;
|
|
virtual nsresult GetXULPadding(nsMargin& aPadding) override;
|
|
virtual bool IsXULCollapsed() override;
|
|
|
|
virtual void Reflow(nsPresContext* aPresContext,
|
|
ReflowOutput& aDesiredSize,
|
|
const ReflowInput& aReflowInput,
|
|
nsReflowStatus& aStatus) override;
|
|
|
|
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override {
|
|
return mHelper.ComputeCustomOverflow(aOverflowAreas);
|
|
}
|
|
|
|
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
|
|
nscoord* aBaseline) const override {
|
|
*aBaseline = GetLogicalBaseline(aWM);
|
|
return true;
|
|
}
|
|
|
|
// Recomputes the scrollable overflow area we store in the helper to take children
|
|
// that are affected by perpsective set on the outer frame and scroll at different
|
|
// rates.
|
|
void AdjustForPerspective(nsRect& aScrollableOverflow);
|
|
|
|
// Called to set the child frames. We typically have three: the scroll area,
|
|
// the vertical scrollbar, and the horizontal scrollbar.
|
|
virtual void SetInitialChildList(ChildListID aListID,
|
|
nsFrameList& aChildList) override;
|
|
virtual void AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void InsertFrames(ChildListID aListID,
|
|
nsIFrame* aPrevFrame,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void RemoveFrame(ChildListID aListID,
|
|
nsIFrame* aOldFrame) override;
|
|
|
|
virtual void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override;
|
|
|
|
virtual nsIScrollableFrame* GetScrollTargetFrame() override {
|
|
return this;
|
|
}
|
|
|
|
virtual nsContainerFrame* GetContentInsertionFrame() override {
|
|
return mHelper.GetScrolledFrame()->GetContentInsertionFrame();
|
|
}
|
|
|
|
virtual bool DoesClipChildren() override { return true; }
|
|
virtual nsSplittableType GetSplittableType() const override;
|
|
|
|
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild) override
|
|
{ nsPoint pt = aChild->GetPosition();
|
|
if (aChild == mHelper.GetScrolledFrame()) pt += GetScrollPosition();
|
|
return pt;
|
|
}
|
|
|
|
// nsIAnonymousContentCreator
|
|
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
|
|
virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
|
|
uint32_t aFilter) override;
|
|
|
|
// nsIScrollableFrame
|
|
virtual nsIFrame* GetScrolledFrame() const override {
|
|
return mHelper.GetScrolledFrame();
|
|
}
|
|
virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override {
|
|
return mHelper.GetScrollbarStylesFromFrame();
|
|
}
|
|
virtual uint32_t GetScrollbarVisibility() const override {
|
|
return mHelper.GetScrollbarVisibility();
|
|
}
|
|
virtual nsMargin GetActualScrollbarSizes() const override {
|
|
return mHelper.GetActualScrollbarSizes();
|
|
}
|
|
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) override {
|
|
return mHelper.GetDesiredScrollbarSizes(aState);
|
|
}
|
|
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
|
|
gfxContext* aRC) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return GetDesiredScrollbarSizes(&bls);
|
|
}
|
|
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
|
|
gfxContext* aRC, mozilla::WritingMode aWM) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return mHelper.GetNondisappearingScrollbarWidth(&bls, aWM);
|
|
}
|
|
virtual nsRect GetScrolledRect() const override {
|
|
return mHelper.GetScrolledRect();
|
|
}
|
|
virtual nsRect GetScrollPortRect() const override {
|
|
return mHelper.GetScrollPortRect();
|
|
}
|
|
virtual nsPoint GetScrollPosition() const override {
|
|
return mHelper.GetScrollPosition();
|
|
}
|
|
virtual nsPoint GetLogicalScrollPosition() const override {
|
|
return mHelper.GetLogicalScrollPosition();
|
|
}
|
|
virtual nsRect GetScrollRange() const override {
|
|
return mHelper.GetScrollRange();
|
|
}
|
|
virtual nsSize GetScrollPositionClampingScrollPortSize() const override {
|
|
return mHelper.GetScrollPositionClampingScrollPortSize();
|
|
}
|
|
virtual nsSize GetLineScrollAmount() const override {
|
|
return mHelper.GetLineScrollAmount();
|
|
}
|
|
virtual nsSize GetPageScrollAmount() const override {
|
|
return mHelper.GetPageScrollAmount();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
|
|
const nsRect* aRange = nullptr,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP)
|
|
override {
|
|
mHelper.ScrollTo(aScrollPosition, aMode, aRange, aSnap);
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
|
|
nsIScrollableFrame::ScrollMode aMode
|
|
= nsIScrollableFrame::INSTANT) override {
|
|
mHelper.ScrollToCSSPixels(aScrollPosition, aMode);
|
|
}
|
|
virtual void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition,
|
|
nsAtom* aOrigin = nullptr) override {
|
|
mHelper.ScrollToCSSPixelsApproximate(aScrollPosition, aOrigin);
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual CSSIntPoint GetScrollPositionCSSPixels() override {
|
|
return mHelper.GetScrollPositionCSSPixels();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollBy(nsIntPoint aDelta, ScrollUnit aUnit, ScrollMode aMode,
|
|
nsIntPoint* aOverflow, nsAtom* aOrigin = nullptr,
|
|
nsIScrollableFrame::ScrollMomentum aMomentum = nsIScrollableFrame::NOT_MOMENTUM,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP)
|
|
override {
|
|
mHelper.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin, aMomentum, aSnap);
|
|
}
|
|
virtual void ScrollSnap() override {
|
|
mHelper.ScrollSnap();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollToRestoredPosition() override {
|
|
mHelper.ScrollToRestoredPosition();
|
|
}
|
|
virtual void AddScrollPositionListener(nsIScrollPositionListener* aListener) override {
|
|
mHelper.AddScrollPositionListener(aListener);
|
|
}
|
|
virtual void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) override {
|
|
mHelper.RemoveScrollPositionListener(aListener);
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void CurPosAttributeChanged(nsIContent* aChild) override {
|
|
mHelper.CurPosAttributeChanged(aChild);
|
|
}
|
|
NS_IMETHOD PostScrolledAreaEventForCurrentArea() override {
|
|
mHelper.PostScrolledAreaEvent();
|
|
return NS_OK;
|
|
}
|
|
virtual bool IsScrollingActive(nsDisplayListBuilder* aBuilder) override {
|
|
return mHelper.IsScrollingActive(aBuilder);
|
|
}
|
|
virtual bool IsMaybeScrollingActive() const override {
|
|
return mHelper.IsMaybeScrollingActive();
|
|
}
|
|
virtual bool IsMaybeAsynchronouslyScrolled() override {
|
|
return mHelper.IsMaybeAsynchronouslyScrolled();
|
|
}
|
|
virtual bool IsProcessingAsyncScroll() override {
|
|
return mHelper.IsProcessingAsyncScroll();
|
|
}
|
|
virtual void ResetScrollPositionForLayerPixelAlignment() override {
|
|
mHelper.ResetScrollPositionForLayerPixelAlignment();
|
|
}
|
|
virtual bool DidHistoryRestore() const override {
|
|
return mHelper.mDidHistoryRestore;
|
|
}
|
|
virtual void ClearDidHistoryRestore() override {
|
|
mHelper.mDidHistoryRestore = false;
|
|
}
|
|
virtual bool IsRectNearlyVisible(const nsRect& aRect) override {
|
|
return mHelper.IsRectNearlyVisible(aRect);
|
|
}
|
|
virtual nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const override {
|
|
return mHelper.ExpandRectToNearlyVisible(aRect);
|
|
}
|
|
virtual nsAtom* LastScrollOrigin() override {
|
|
return mHelper.LastScrollOrigin();
|
|
}
|
|
virtual void AllowScrollOriginDowngrade() override {
|
|
mHelper.AllowScrollOriginDowngrade();
|
|
}
|
|
virtual nsAtom* LastSmoothScrollOrigin() override {
|
|
return mHelper.LastSmoothScrollOrigin();
|
|
}
|
|
virtual uint32_t CurrentScrollGeneration() override {
|
|
return mHelper.CurrentScrollGeneration();
|
|
}
|
|
virtual nsPoint LastScrollDestination() override {
|
|
return mHelper.LastScrollDestination();
|
|
}
|
|
virtual void ResetScrollInfoIfGeneration(uint32_t aGeneration) override {
|
|
mHelper.ResetScrollInfoIfGeneration(aGeneration);
|
|
}
|
|
virtual bool WantAsyncScroll() const override {
|
|
return mHelper.WantAsyncScroll();
|
|
}
|
|
virtual mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
|
|
LayerManager* aLayerManager,
|
|
const nsIFrame* aContainerReferenceFrame,
|
|
const ContainerLayerParameters& aParameters,
|
|
const mozilla::DisplayItemClip* aClip) const override
|
|
{
|
|
return mHelper.ComputeScrollMetadata(aLayerManager, aContainerReferenceFrame, aParameters, aClip);
|
|
}
|
|
virtual void ClipLayerToDisplayPort(Layer* aLayer,
|
|
const mozilla::DisplayItemClip* aClip,
|
|
const ContainerLayerParameters& aParameters) const override
|
|
{
|
|
mHelper.ClipLayerToDisplayPort(aLayer, aClip, aParameters);
|
|
}
|
|
virtual bool IsIgnoringViewportClipping() const override {
|
|
return mHelper.IsIgnoringViewportClipping();
|
|
}
|
|
virtual void MarkScrollbarsDirtyForReflow() const override {
|
|
mHelper.MarkScrollbarsDirtyForReflow();
|
|
}
|
|
virtual bool UsesContainerScrolling() const override {
|
|
return mHelper.UsesContainerScrolling();
|
|
}
|
|
virtual bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
|
|
nsRect* aVisibleRect,
|
|
nsRect* aDirtyRect,
|
|
bool aSetBase) override {
|
|
return mHelper.DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect, aSetBase);
|
|
}
|
|
virtual void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) override {
|
|
mHelper.NotifyApproximateFrameVisibilityUpdate(aIgnoreDisplayPort);
|
|
}
|
|
virtual bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(nsRect* aDisplayPort) override {
|
|
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(aDisplayPort);
|
|
}
|
|
void TriggerDisplayPortExpiration() override {
|
|
mHelper.TriggerDisplayPortExpiration();
|
|
}
|
|
|
|
// nsIStatefulFrame
|
|
mozilla::UniquePtr<mozilla::PresState> SaveState() override {
|
|
return mHelper.SaveState();
|
|
}
|
|
NS_IMETHOD RestoreState(mozilla::PresState* aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
mHelper.RestoreState(aState);
|
|
return NS_OK;
|
|
}
|
|
|
|
// nsIScrollbarMediator
|
|
virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByPage(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByWhole(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByLine(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override {
|
|
mHelper.RepeatButtonScroll(aScrollbar);
|
|
}
|
|
virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
|
|
nscoord aOldPos,
|
|
nscoord aNewPos) override {
|
|
mHelper.ThumbMoved(aScrollbar, aOldPos, aNewPos);
|
|
}
|
|
virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {
|
|
mHelper.ScrollbarReleased(aScrollbar);
|
|
}
|
|
virtual void VisibilityChanged(bool aVisible) override {}
|
|
virtual nsIFrame* GetScrollbarBox(bool aVertical) override {
|
|
return mHelper.GetScrollbarBox(aVertical);
|
|
}
|
|
virtual void ScrollbarActivityStarted() const override;
|
|
virtual void ScrollbarActivityStopped() const override;
|
|
|
|
virtual bool IsScrollbarOnRight() const override {
|
|
return mHelper.IsScrollbarOnRight();
|
|
}
|
|
|
|
virtual bool ShouldSuppressScrollbarRepaints() const override {
|
|
return mHelper.ShouldSuppressScrollbarRepaints();
|
|
}
|
|
|
|
virtual void SetTransformingByAPZ(bool aTransforming) override {
|
|
mHelper.SetTransformingByAPZ(aTransforming);
|
|
}
|
|
bool IsTransformingByAPZ() const override {
|
|
return mHelper.IsTransformingByAPZ();
|
|
}
|
|
void SetScrollableByAPZ(bool aScrollable) override {
|
|
mHelper.SetScrollableByAPZ(aScrollable);
|
|
}
|
|
void SetZoomableByAPZ(bool aZoomable) override {
|
|
mHelper.SetZoomableByAPZ(aZoomable);
|
|
}
|
|
void SetHasOutOfFlowContentInsideFilter() override {
|
|
mHelper.SetHasOutOfFlowContentInsideFilter();
|
|
}
|
|
|
|
ScrollSnapInfo GetScrollSnapInfo() const override {
|
|
return mHelper.GetScrollSnapInfo();
|
|
}
|
|
|
|
virtual bool DragScroll(mozilla::WidgetEvent* aEvent) override {
|
|
return mHelper.DragScroll(aEvent);
|
|
}
|
|
|
|
virtual void AsyncScrollbarDragRejected() override {
|
|
return mHelper.AsyncScrollbarDragRejected();
|
|
}
|
|
|
|
virtual bool IsRootScrollFrameOfDocument() const override {
|
|
return mHelper.IsRootScrollFrameOfDocument();
|
|
}
|
|
|
|
// Return the scrolled frame.
|
|
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override {
|
|
aResult.AppendElement(OwnedAnonBox(mHelper.GetScrolledFrame()));
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
#ifdef ACCESSIBILITY
|
|
virtual mozilla::a11y::AccType AccessibleType() override;
|
|
#endif
|
|
|
|
protected:
|
|
nsHTMLScrollFrame(ComputedStyle* aStyle, bool aIsRoot)
|
|
: nsHTMLScrollFrame(aStyle, kClassID, aIsRoot)
|
|
{}
|
|
|
|
nsHTMLScrollFrame(ComputedStyle* aStyle,
|
|
nsIFrame::ClassID aID,
|
|
bool aIsRoot);
|
|
void SetSuppressScrollbarUpdate(bool aSuppress) {
|
|
mHelper.mSuppressScrollbarUpdate = aSuppress;
|
|
}
|
|
bool GuessHScrollbarNeeded(const ScrollReflowInput& aState);
|
|
bool GuessVScrollbarNeeded(const ScrollReflowInput& aState);
|
|
|
|
bool IsScrollbarUpdateSuppressed() const {
|
|
return mHelper.mSuppressScrollbarUpdate;
|
|
}
|
|
|
|
// Return whether we're in an "initial" reflow. Some reflows with
|
|
// NS_FRAME_FIRST_REFLOW set are NOT "initial" as far as we're concerned.
|
|
bool InInitialReflow() const;
|
|
|
|
/**
|
|
* Override this to return false if computed bsize/min-bsize/max-bsize
|
|
* should NOT be propagated to child content.
|
|
* nsListControlFrame uses this.
|
|
*/
|
|
virtual bool ShouldPropagateComputedBSizeToScrolledContent() const { return true; }
|
|
|
|
private:
|
|
friend class mozilla::ScrollFrameHelper;
|
|
ScrollFrameHelper mHelper;
|
|
};
|
|
|
|
/**
|
|
* The scroll frame creates and manages the scrolling view
|
|
*
|
|
* It only supports having a single child frame that typically is an area
|
|
* frame, but doesn't have to be. The child frame must have a view, though
|
|
*
|
|
* Scroll frames don't support incremental changes, i.e. you can't replace
|
|
* or remove the scrolled frame
|
|
*/
|
|
class nsXULScrollFrame final : public nsBoxFrame,
|
|
public nsIScrollableFrame,
|
|
public nsIAnonymousContentCreator,
|
|
public nsIStatefulFrame
|
|
{
|
|
public:
|
|
typedef mozilla::ScrollFrameHelper ScrollFrameHelper;
|
|
typedef mozilla::CSSIntPoint CSSIntPoint;
|
|
|
|
NS_DECL_QUERYFRAME
|
|
NS_DECL_FRAMEARENA_HELPERS(nsXULScrollFrame)
|
|
|
|
friend nsXULScrollFrame* NS_NewXULScrollFrame(nsIPresShell* aPresShell,
|
|
ComputedStyle* aStyle,
|
|
bool aIsRoot,
|
|
bool aClipAllDescendants);
|
|
|
|
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
|
|
const nsDisplayListSet& aLists) override {
|
|
mHelper.BuildDisplayList(aBuilder, aLists);
|
|
}
|
|
|
|
// XXXldb Is this actually used?
|
|
#if 0
|
|
virtual nscoord GetMinISize(gfxContext *aRenderingContext) override;
|
|
#endif
|
|
|
|
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override {
|
|
return mHelper.ComputeCustomOverflow(aOverflowAreas);
|
|
}
|
|
|
|
bool GetVerticalAlignBaseline(mozilla::WritingMode aWM,
|
|
nscoord* aBaseline) const override {
|
|
*aBaseline = GetLogicalBaseline(aWM);
|
|
return true;
|
|
}
|
|
|
|
// Called to set the child frames. We typically have three: the scroll area,
|
|
// the vertical scrollbar, and the horizontal scrollbar.
|
|
virtual void SetInitialChildList(ChildListID aListID,
|
|
nsFrameList& aChildList) override;
|
|
virtual void AppendFrames(ChildListID aListID,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void InsertFrames(ChildListID aListID,
|
|
nsIFrame* aPrevFrame,
|
|
nsFrameList& aFrameList) override;
|
|
virtual void RemoveFrame(ChildListID aListID,
|
|
nsIFrame* aOldFrame) override;
|
|
|
|
virtual void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override;
|
|
|
|
|
|
virtual nsIScrollableFrame* GetScrollTargetFrame() override {
|
|
return this;
|
|
}
|
|
|
|
virtual nsContainerFrame* GetContentInsertionFrame() override {
|
|
return mHelper.GetScrolledFrame()->GetContentInsertionFrame();
|
|
}
|
|
|
|
virtual bool DoesClipChildren() override { return true; }
|
|
virtual nsSplittableType GetSplittableType() const override;
|
|
|
|
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild) override
|
|
{ nsPoint pt = aChild->GetPosition();
|
|
if (aChild == mHelper.GetScrolledFrame())
|
|
pt += mHelper.GetLogicalScrollPosition();
|
|
return pt;
|
|
}
|
|
|
|
// nsIAnonymousContentCreator
|
|
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
|
|
virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
|
|
uint32_t aFilter) override;
|
|
|
|
virtual nsSize GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) override;
|
|
virtual nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override;
|
|
virtual nsSize GetXULMaxSize(nsBoxLayoutState& aBoxLayoutState) override;
|
|
virtual nscoord GetXULBoxAscent(nsBoxLayoutState& aBoxLayoutState) override;
|
|
|
|
NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override;
|
|
virtual nsresult GetXULPadding(nsMargin& aPadding) override;
|
|
|
|
virtual bool GetBorderRadii(const nsSize& aFrameSize, const nsSize& aBorderArea,
|
|
Sides aSkipSides, nscoord aRadii[8]) const override {
|
|
return mHelper.GetBorderRadii(aFrameSize, aBorderArea, aSkipSides, aRadii);
|
|
}
|
|
|
|
nsresult XULLayout(nsBoxLayoutState& aState);
|
|
void LayoutScrollArea(nsBoxLayoutState& aState, const nsPoint& aScrollPosition);
|
|
|
|
static bool AddRemoveScrollbar(bool& aHasScrollbar,
|
|
nscoord& aXY,
|
|
nscoord& aSize,
|
|
nscoord aSbSize,
|
|
bool aOnRightOrBottom,
|
|
bool aAdd);
|
|
|
|
bool AddRemoveScrollbar(nsBoxLayoutState& aState,
|
|
bool aOnRightOrBottom,
|
|
bool aHorizontal,
|
|
bool aAdd);
|
|
|
|
bool AddHorizontalScrollbar (nsBoxLayoutState& aState, bool aOnBottom);
|
|
bool AddVerticalScrollbar (nsBoxLayoutState& aState, bool aOnRight);
|
|
void RemoveHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom);
|
|
void RemoveVerticalScrollbar (nsBoxLayoutState& aState, bool aOnRight);
|
|
|
|
static void AdjustReflowInputForPrintPreview(nsBoxLayoutState& aState, bool& aSetBack);
|
|
static void AdjustReflowInputBack(nsBoxLayoutState& aState, bool aSetBack);
|
|
|
|
// nsIScrollableFrame
|
|
virtual nsIFrame* GetScrolledFrame() const override {
|
|
return mHelper.GetScrolledFrame();
|
|
}
|
|
virtual mozilla::ScrollbarStyles GetScrollbarStyles() const override {
|
|
return mHelper.GetScrollbarStylesFromFrame();
|
|
}
|
|
virtual uint32_t GetScrollbarVisibility() const override {
|
|
return mHelper.GetScrollbarVisibility();
|
|
}
|
|
virtual nsMargin GetActualScrollbarSizes() const override {
|
|
return mHelper.GetActualScrollbarSizes();
|
|
}
|
|
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) override {
|
|
return mHelper.GetDesiredScrollbarSizes(aState);
|
|
}
|
|
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
|
|
gfxContext* aRC) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return GetDesiredScrollbarSizes(&bls);
|
|
}
|
|
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
|
|
gfxContext* aRC, mozilla::WritingMode aWM) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return mHelper.GetNondisappearingScrollbarWidth(&bls, aWM);
|
|
}
|
|
virtual nsRect GetScrolledRect() const override {
|
|
return mHelper.GetScrolledRect();
|
|
}
|
|
virtual nsRect GetScrollPortRect() const override {
|
|
return mHelper.GetScrollPortRect();
|
|
}
|
|
virtual nsPoint GetScrollPosition() const override {
|
|
return mHelper.GetScrollPosition();
|
|
}
|
|
virtual nsPoint GetLogicalScrollPosition() const override {
|
|
return mHelper.GetLogicalScrollPosition();
|
|
}
|
|
virtual nsRect GetScrollRange() const override {
|
|
return mHelper.GetScrollRange();
|
|
}
|
|
virtual nsSize GetScrollPositionClampingScrollPortSize() const override {
|
|
return mHelper.GetScrollPositionClampingScrollPortSize();
|
|
}
|
|
virtual nsSize GetLineScrollAmount() const override {
|
|
return mHelper.GetLineScrollAmount();
|
|
}
|
|
virtual nsSize GetPageScrollAmount() const override {
|
|
return mHelper.GetPageScrollAmount();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
|
|
const nsRect* aRange = nullptr,
|
|
ScrollSnapMode aSnap = nsIScrollbarMediator::DISABLE_SNAP)
|
|
override {
|
|
mHelper.ScrollTo(aScrollPosition, aMode, aRange, aSnap);
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
|
|
nsIScrollableFrame::ScrollMode aMode
|
|
= nsIScrollableFrame::INSTANT) override {
|
|
mHelper.ScrollToCSSPixels(aScrollPosition, aMode);
|
|
}
|
|
virtual void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition,
|
|
nsAtom* aOrigin = nullptr) override {
|
|
mHelper.ScrollToCSSPixelsApproximate(aScrollPosition, aOrigin);
|
|
}
|
|
virtual CSSIntPoint GetScrollPositionCSSPixels() override {
|
|
return mHelper.GetScrollPositionCSSPixels();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollBy(nsIntPoint aDelta, ScrollUnit aUnit, ScrollMode aMode,
|
|
nsIntPoint* aOverflow, nsAtom* aOrigin = nullptr,
|
|
nsIScrollableFrame::ScrollMomentum aMomentum = nsIScrollableFrame::NOT_MOMENTUM,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP)
|
|
override {
|
|
mHelper.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin, aMomentum, aSnap);
|
|
}
|
|
virtual void ScrollSnap() override {
|
|
mHelper.ScrollSnap();
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void ScrollToRestoredPosition() override {
|
|
mHelper.ScrollToRestoredPosition();
|
|
}
|
|
virtual void AddScrollPositionListener(nsIScrollPositionListener* aListener) override {
|
|
mHelper.AddScrollPositionListener(aListener);
|
|
}
|
|
virtual void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) override {
|
|
mHelper.RemoveScrollPositionListener(aListener);
|
|
}
|
|
/**
|
|
* @note This method might destroy the frame, pres shell and other objects.
|
|
*/
|
|
virtual void CurPosAttributeChanged(nsIContent* aChild) override {
|
|
mHelper.CurPosAttributeChanged(aChild);
|
|
}
|
|
NS_IMETHOD PostScrolledAreaEventForCurrentArea() override {
|
|
mHelper.PostScrolledAreaEvent();
|
|
return NS_OK;
|
|
}
|
|
virtual bool IsScrollingActive(nsDisplayListBuilder* aBuilder) override {
|
|
return mHelper.IsScrollingActive(aBuilder);
|
|
}
|
|
virtual bool IsMaybeScrollingActive() const override {
|
|
return mHelper.IsMaybeScrollingActive();
|
|
}
|
|
virtual bool IsMaybeAsynchronouslyScrolled() override {
|
|
return mHelper.IsMaybeAsynchronouslyScrolled();
|
|
}
|
|
virtual bool IsProcessingAsyncScroll() override {
|
|
return mHelper.IsProcessingAsyncScroll();
|
|
}
|
|
virtual void ResetScrollPositionForLayerPixelAlignment() override {
|
|
mHelper.ResetScrollPositionForLayerPixelAlignment();
|
|
}
|
|
virtual bool DidHistoryRestore() const override {
|
|
return mHelper.mDidHistoryRestore;
|
|
}
|
|
virtual void ClearDidHistoryRestore() override {
|
|
mHelper.mDidHistoryRestore = false;
|
|
}
|
|
virtual bool IsRectNearlyVisible(const nsRect& aRect) override {
|
|
return mHelper.IsRectNearlyVisible(aRect);
|
|
}
|
|
virtual nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const override {
|
|
return mHelper.ExpandRectToNearlyVisible(aRect);
|
|
}
|
|
virtual nsAtom* LastScrollOrigin() override {
|
|
return mHelper.LastScrollOrigin();
|
|
}
|
|
virtual void AllowScrollOriginDowngrade() override {
|
|
mHelper.AllowScrollOriginDowngrade();
|
|
}
|
|
virtual nsAtom* LastSmoothScrollOrigin() override {
|
|
return mHelper.LastSmoothScrollOrigin();
|
|
}
|
|
virtual uint32_t CurrentScrollGeneration() override {
|
|
return mHelper.CurrentScrollGeneration();
|
|
}
|
|
virtual nsPoint LastScrollDestination() override {
|
|
return mHelper.LastScrollDestination();
|
|
}
|
|
virtual void ResetScrollInfoIfGeneration(uint32_t aGeneration) override {
|
|
mHelper.ResetScrollInfoIfGeneration(aGeneration);
|
|
}
|
|
virtual bool WantAsyncScroll() const override {
|
|
return mHelper.WantAsyncScroll();
|
|
}
|
|
virtual mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
|
|
LayerManager* aLayerManager,
|
|
const nsIFrame* aContainerReferenceFrame,
|
|
const ContainerLayerParameters& aParameters,
|
|
const mozilla::DisplayItemClip* aClip) const override
|
|
{
|
|
return mHelper.ComputeScrollMetadata(aLayerManager, aContainerReferenceFrame, aParameters, aClip);
|
|
}
|
|
virtual void ClipLayerToDisplayPort(Layer* aLayer,
|
|
const mozilla::DisplayItemClip* aClip,
|
|
const ContainerLayerParameters& aParameters) const override {
|
|
mHelper.ClipLayerToDisplayPort(aLayer, aClip, aParameters);
|
|
}
|
|
virtual bool IsIgnoringViewportClipping() const override {
|
|
return mHelper.IsIgnoringViewportClipping();
|
|
}
|
|
virtual void MarkScrollbarsDirtyForReflow() const override {
|
|
mHelper.MarkScrollbarsDirtyForReflow();
|
|
}
|
|
|
|
// nsIStatefulFrame
|
|
mozilla::UniquePtr<mozilla::PresState> SaveState() override {
|
|
return mHelper.SaveState();
|
|
}
|
|
NS_IMETHOD RestoreState(mozilla::PresState* aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
mHelper.RestoreState(aState);
|
|
return NS_OK;
|
|
}
|
|
|
|
virtual bool IsFrameOfType(uint32_t aFlags) const override
|
|
{
|
|
// Override bogus IsFrameOfType in nsBoxFrame.
|
|
if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
|
|
return false;
|
|
return nsBoxFrame::IsFrameOfType(aFlags);
|
|
}
|
|
|
|
virtual void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByPage(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByWhole(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP) override {
|
|
mHelper.ScrollByLine(aScrollbar, aDirection, aSnap);
|
|
}
|
|
virtual void RepeatButtonScroll(nsScrollbarFrame* aScrollbar) override {
|
|
mHelper.RepeatButtonScroll(aScrollbar);
|
|
}
|
|
virtual void ThumbMoved(nsScrollbarFrame* aScrollbar,
|
|
nscoord aOldPos,
|
|
nscoord aNewPos) override {
|
|
mHelper.ThumbMoved(aScrollbar, aOldPos, aNewPos);
|
|
}
|
|
virtual void ScrollbarReleased(nsScrollbarFrame* aScrollbar) override {
|
|
mHelper.ScrollbarReleased(aScrollbar);
|
|
}
|
|
virtual void VisibilityChanged(bool aVisible) override {}
|
|
virtual nsIFrame* GetScrollbarBox(bool aVertical) override {
|
|
return mHelper.GetScrollbarBox(aVertical);
|
|
}
|
|
|
|
virtual void ScrollbarActivityStarted() const override;
|
|
virtual void ScrollbarActivityStopped() const override;
|
|
|
|
virtual bool IsScrollbarOnRight() const override {
|
|
return mHelper.IsScrollbarOnRight();
|
|
}
|
|
|
|
virtual bool ShouldSuppressScrollbarRepaints() const override {
|
|
return mHelper.ShouldSuppressScrollbarRepaints();
|
|
}
|
|
|
|
virtual void SetTransformingByAPZ(bool aTransforming) override {
|
|
mHelper.SetTransformingByAPZ(aTransforming);
|
|
}
|
|
virtual bool UsesContainerScrolling() const override {
|
|
return mHelper.UsesContainerScrolling();
|
|
}
|
|
bool IsTransformingByAPZ() const override {
|
|
return mHelper.IsTransformingByAPZ();
|
|
}
|
|
void SetScrollableByAPZ(bool aScrollable) override {
|
|
mHelper.SetScrollableByAPZ(aScrollable);
|
|
}
|
|
void SetZoomableByAPZ(bool aZoomable) override {
|
|
mHelper.SetZoomableByAPZ(aZoomable);
|
|
}
|
|
void SetHasOutOfFlowContentInsideFilter() override {
|
|
mHelper.SetHasOutOfFlowContentInsideFilter();
|
|
}
|
|
virtual bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
|
|
nsRect* aVisibleRect,
|
|
nsRect* aDirtyRect,
|
|
bool aSetBase) override {
|
|
return mHelper.DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect, aSetBase);
|
|
}
|
|
virtual void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) override {
|
|
mHelper.NotifyApproximateFrameVisibilityUpdate(aIgnoreDisplayPort);
|
|
}
|
|
virtual bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(nsRect* aDisplayPort) override {
|
|
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(aDisplayPort);
|
|
}
|
|
void TriggerDisplayPortExpiration() override {
|
|
mHelper.TriggerDisplayPortExpiration();
|
|
}
|
|
|
|
ScrollSnapInfo GetScrollSnapInfo() const override {
|
|
return mHelper.GetScrollSnapInfo();
|
|
}
|
|
|
|
virtual bool DragScroll(mozilla::WidgetEvent* aEvent) override {
|
|
return mHelper.DragScroll(aEvent);
|
|
}
|
|
|
|
virtual void AsyncScrollbarDragRejected() override {
|
|
return mHelper.AsyncScrollbarDragRejected();
|
|
}
|
|
|
|
virtual bool IsRootScrollFrameOfDocument() const override {
|
|
return mHelper.IsRootScrollFrameOfDocument();
|
|
}
|
|
|
|
// Return the scrolled frame.
|
|
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override {
|
|
aResult.AppendElement(OwnedAnonBox(mHelper.GetScrolledFrame()));
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
protected:
|
|
nsXULScrollFrame(ComputedStyle* aStyle, bool aIsRoot,
|
|
bool aClipAllDescendants);
|
|
|
|
void ClampAndSetBounds(nsBoxLayoutState& aState,
|
|
nsRect& aRect,
|
|
nsPoint aScrollPosition,
|
|
bool aRemoveOverflowAreas = false) {
|
|
/*
|
|
* For RTL frames, restore the original scrolled position of the right
|
|
* edge, then subtract the current width to find the physical position.
|
|
*/
|
|
if (!mHelper.IsPhysicalLTR()) {
|
|
aRect.x = mHelper.mScrollPort.XMost() - aScrollPosition.x - aRect.width;
|
|
}
|
|
mHelper.mScrolledFrame->SetXULBounds(aState, aRect, aRemoveOverflowAreas);
|
|
}
|
|
|
|
private:
|
|
friend class mozilla::ScrollFrameHelper;
|
|
ScrollFrameHelper mHelper;
|
|
};
|
|
|
|
#endif /* nsGfxScrollFrame_h___ */
|