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312 lines
8.7 KiB
C++
312 lines
8.7 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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//
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// Eric Vaughan
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// Netscape Communications
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//
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// See documentation in associated header file
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//
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#include "nsScrollbarFrame.h"
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#include "nsSliderFrame.h"
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#include "nsScrollbarButtonFrame.h"
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#include "nsGkAtoms.h"
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#include "nsIScrollableFrame.h"
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#include "nsIScrollbarMediator.h"
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#include "mozilla/LookAndFeel.h"
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#include "nsThemeConstants.h"
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#include "nsIContent.h"
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#include "nsIDOMMutationEvent.h"
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using namespace mozilla;
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//
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// NS_NewScrollbarFrame
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//
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// Creates a new scrollbar frame and returns it
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//
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nsIFrame*
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NS_NewScrollbarFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsScrollbarFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarFrame)
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NS_QUERYFRAME_HEAD(nsScrollbarFrame)
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NS_QUERYFRAME_ENTRY(nsScrollbarFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
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void
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nsScrollbarFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
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// We want to be a reflow root since we use reflows to move the
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// slider. Any reflow inside the scrollbar frame will be a reflow to
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// move the slider and will thus not change anything outside of the
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// scrollbar or change the size of the scrollbar frame.
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mState |= NS_FRAME_REFLOW_ROOT;
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}
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void
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nsScrollbarFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus)
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{
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nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
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// nsGfxScrollFrame may have told us to shrink to nothing. If so, make sure our
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// desired size agrees.
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if (aReflowInput.AvailableWidth() == 0) {
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aDesiredSize.Width() = 0;
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}
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if (aReflowInput.AvailableHeight() == 0) {
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aDesiredSize.Height() = 0;
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}
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}
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nsIAtom*
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nsScrollbarFrame::GetType() const
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{
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return nsGkAtoms::scrollbarFrame;
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}
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nsresult
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nsScrollbarFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
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aModType);
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// if the current position changes, notify any nsGfxScrollFrame
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// parent we may have
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if (aAttribute != nsGkAtoms::curpos)
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return rv;
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nsIScrollableFrame* scrollable = do_QueryFrame(GetParent());
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if (!scrollable)
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return rv;
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nsCOMPtr<nsIContent> content(mContent);
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scrollable->CurPosAttributeChanged(content);
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return rv;
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}
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NS_IMETHODIMP
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nsScrollbarFrame::HandlePress(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScrollbarFrame::HandleMultiplePress(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus,
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bool aControlHeld)
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScrollbarFrame::HandleDrag(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScrollbarFrame::HandleRelease(nsPresContext* aPresContext,
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WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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return NS_OK;
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}
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void
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nsScrollbarFrame::SetScrollbarMediatorContent(nsIContent* aMediator)
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{
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mScrollbarMediator = aMediator;
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}
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nsIScrollbarMediator*
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nsScrollbarFrame::GetScrollbarMediator()
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{
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if (!mScrollbarMediator) {
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return nullptr;
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}
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nsIFrame* f = mScrollbarMediator->GetPrimaryFrame();
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nsIScrollableFrame* scrollFrame = do_QueryFrame(f);
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nsIScrollbarMediator* sbm;
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if (scrollFrame) {
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nsIFrame* scrolledFrame = scrollFrame->GetScrolledFrame();
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sbm = do_QueryFrame(scrolledFrame);
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if (sbm) {
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return sbm;
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}
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}
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sbm = do_QueryFrame(f);
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if (f && !sbm) {
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f = f->PresContext()->PresShell()->GetRootScrollFrame();
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if (f && f->GetContent() == mScrollbarMediator) {
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return do_QueryFrame(f);
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}
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}
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return sbm;
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}
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nsresult
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nsScrollbarFrame::GetXULMargin(nsMargin& aMargin)
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{
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nsresult rv = NS_ERROR_FAILURE;
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aMargin.SizeTo(0,0,0,0);
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if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
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nsPresContext* presContext = PresContext();
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nsITheme* theme = presContext->GetTheme();
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if (theme) {
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LayoutDeviceIntSize size;
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bool isOverridable;
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theme->GetMinimumWidgetSize(presContext, this, NS_THEME_SCROLLBAR, &size,
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&isOverridable);
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if (IsXULHorizontal()) {
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aMargin.top = -presContext->DevPixelsToAppUnits(size.height);
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}
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else {
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aMargin.left = -presContext->DevPixelsToAppUnits(size.width);
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}
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rv = NS_OK;
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}
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}
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if (NS_FAILED(rv)) {
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rv = nsBox::GetXULMargin(aMargin);
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}
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if (NS_SUCCEEDED(rv) && !IsXULHorizontal()) {
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nsIScrollbarMediator* scrollFrame = GetScrollbarMediator();
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if (scrollFrame && !scrollFrame->IsScrollbarOnRight()) {
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Swap(aMargin.left, aMargin.right);
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}
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}
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return rv;
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}
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void
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nsScrollbarFrame::SetIncrementToLine(int32_t aDirection)
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{
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// get the scrollbar's content node
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nsIContent* content = GetContent();
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mSmoothScroll = true;
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mIncrement = aDirection * nsSliderFrame::GetIncrement(content);
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}
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void
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nsScrollbarFrame::SetIncrementToPage(int32_t aDirection)
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{
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// get the scrollbar's content node
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nsIContent* content = GetContent();
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mSmoothScroll = true;
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mIncrement = aDirection * nsSliderFrame::GetPageIncrement(content);
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}
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void
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nsScrollbarFrame::SetIncrementToWhole(int32_t aDirection)
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{
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// get the scrollbar's content node
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nsIContent* content = GetContent();
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if (aDirection == -1)
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mIncrement = -nsSliderFrame::GetCurrentPosition(content);
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else
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mIncrement = nsSliderFrame::GetMaxPosition(content) -
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nsSliderFrame::GetCurrentPosition(content);
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// Don't repeat or use smooth scrolling if scrolling to beginning or end
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// of a page.
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mSmoothScroll = false;
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}
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int32_t
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nsScrollbarFrame::MoveToNewPosition()
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{
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// get the scrollbar's content node
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nsCOMPtr<nsIContent> content = GetContent();
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// get the current pos
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int32_t curpos = nsSliderFrame::GetCurrentPosition(content);
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// get the max pos
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int32_t maxpos = nsSliderFrame::GetMaxPosition(content);
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// save the old curpos
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int32_t oldCurpos = curpos;
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// increment the given amount
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if (mIncrement) {
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curpos += mIncrement;
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}
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// make sure the current position is between the current and max positions
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if (curpos < 0) {
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curpos = 0;
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} else if (curpos > maxpos) {
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curpos = maxpos;
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}
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// set the current position of the slider.
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nsAutoString curposStr;
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curposStr.AppendInt(curpos);
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nsWeakFrame weakFrame(this);
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if (mSmoothScroll) {
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content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);
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}
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content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, false);
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// notify the nsScrollbarFrame of the change
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AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
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if (!weakFrame.IsAlive()) {
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return curpos;
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}
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// notify all nsSliderFrames of the change
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nsIFrame::ChildListIterator childLists(this);
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for (; !childLists.IsDone(); childLists.Next()) {
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nsFrameList::Enumerator childFrames(childLists.CurrentList());
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for (; !childFrames.AtEnd(); childFrames.Next()) {
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nsIFrame* f = childFrames.get();
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nsSliderFrame* sliderFrame = do_QueryFrame(f);
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if (sliderFrame) {
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sliderFrame->AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
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if (!weakFrame.IsAlive()) {
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return curpos;
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}
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}
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}
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}
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// See if we have appearance information for a theme.
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const nsStyleDisplay* disp = StyleDisplay();
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nsPresContext* presContext = PresContext();
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if (disp->mAppearance) {
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nsITheme *theme = presContext->GetTheme();
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if (theme && theme->ThemeSupportsWidget(presContext, this, disp->mAppearance)) {
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bool repaint;
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nsAttrValue oldValue;
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oldValue.SetTo(oldCurpos);
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theme->WidgetStateChanged(this, disp->mAppearance, nsGkAtoms::curpos,
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&repaint, &oldValue);
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}
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}
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content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
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return curpos;
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}
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