1498 lines
58 KiB
C++
1498 lines
58 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* rendering object to wrap rendering objects that should be scrollable */
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#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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class nsPresContext;
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class nsIPresShell;
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class nsIContent;
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class nsIAtom;
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class nsPresState;
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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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} // 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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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::ScrollStyles GetScrollStylesFromFrame() 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 PostOverflowEvent();
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void Destroy();
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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);
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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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* nsRefreshDriver maintains three lists of refresh observers, one for each
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* flush type: Flush_Style, Flush_Layout, and Flush_Display.
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*
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* During a tick, it runs through each list of observers, in order, and runs
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* them. To iterate over each list, it uses an EndLimitedIterator, which is
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* designed to iterate only over elements present when the iterator was
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* created, not elements added afterwards. This means that, for a given flush
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* type, a refresh observer added during the execution of another refresh
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* observer of that flush type, will not run until the next tick.
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*
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* During main-thread animation-driven scrolling, ScrollEvents are *posted*
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* by AsyncScroll::WillRefresh(). AsyncScroll registers itself as a Flush_Style
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* refresh observer.
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*
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* Posting a scroll event, as of bug 1250550, registers a Flush_Layout
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* refresh observer, which *fires* the event when run. This allows the event
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* to be fired to content in the same refresh driver tick as it is posted.
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* This is an important invariant to maintain to reduce scroll event latency
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* for main-thread scrolling.
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*/
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class ScrollEvent : public nsARefreshObserver {
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public:
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NS_INLINE_DECL_REFCOUNTING(ScrollEvent, override)
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explicit ScrollEvent(ScrollFrameHelper *helper);
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void WillRefresh(mozilla::TimeStamp aTime) override;
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protected:
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virtual ~ScrollEvent();
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private:
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ScrollFrameHelper *mHelper;
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RefPtr<nsRefreshDriver> mDriver;
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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) : mHelper(helper) {}
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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) : mHelper(helper) {}
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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(nsIContent* aContent, nscoord aMinXY,
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nscoord aMaxXY, nscoord aCurPosXY,
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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(nsIContent* aContent, 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(nsIContent* aContent, nsIAtom* aAtom, nscoord aSize);
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nscoord GetCoordAttribute(nsIFrame* aFrame, nsIAtom* 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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nsIAtom* 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, nsIAtom* 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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nsIAtom* 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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bool PageIsStillLoading();
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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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nsPresState* SaveState() const;
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void RestoreState(nsPresState* 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 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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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 SetScrollsClipOnUnscrolledOutOfFlow();
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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* aDirtyRect,
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bool aAllowCreateDisplayPort);
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void NotifyApproximateFrameVisibilityUpdate();
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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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nsIAtom* LastScrollOrigin() const { return mLastScrollOrigin; }
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void AllowScrollOriginDowngrade() { mAllowScrollOriginDowngrade = true; }
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nsIAtom* 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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Layer* aLayer, nsIFrame* aContainerReferenceFrame,
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const ContainerLayerParameters& aParameters,
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const mozilla::DisplayItemClip* aClip) const;
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// nsIScrollbarMediator
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void ScrollByPage(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP);
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void ScrollByWhole(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP);
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void ScrollByLine(nsScrollbarFrame* aScrollbar, int32_t aDirection,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP);
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void RepeatButtonScroll(nsScrollbarFrame* aScrollbar);
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void ThumbMoved(nsScrollbarFrame* aScrollbar,
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nscoord aOldPos,
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nscoord aNewPos);
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void ScrollbarReleased(nsScrollbarFrame* aScrollbar);
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void ScrollByUnit(nsScrollbarFrame* aScrollbar,
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nsIScrollableFrame::ScrollMode aMode,
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int32_t aDirection,
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nsIScrollableFrame::ScrollUnit aUnit,
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nsIScrollbarMediator::ScrollSnapMode aSnap
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= nsIScrollbarMediator::DISABLE_SNAP);
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bool ShouldSuppressScrollbarRepaints() const {
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return mSuppressScrollbarRepaints;
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}
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// owning references to the nsIAnonymousContentCreator-built content
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nsCOMPtr<nsIContent> mHScrollbarContent;
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nsCOMPtr<nsIContent> mVScrollbarContent;
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nsCOMPtr<nsIContent> mScrollCornerContent;
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nsCOMPtr<nsIContent> mResizerContent;
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RefPtr<ScrollEvent> mScrollEvent;
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nsRevocableEventPtr<AsyncScrollPortEvent> mAsyncScrollPortEvent;
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nsRevocableEventPtr<ScrolledAreaEvent> mScrolledAreaEvent;
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nsIFrame* mHScrollbarBox;
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nsIFrame* mVScrollbarBox;
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nsIFrame* mScrolledFrame;
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nsIFrame* mScrollCornerBox;
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nsIFrame* mResizerBox;
|
|
nsContainerFrame* mOuter;
|
|
RefPtr<AsyncScroll> mAsyncScroll;
|
|
RefPtr<AsyncSmoothMSDScroll> mAsyncSmoothMSDScroll;
|
|
RefPtr<ScrollbarActivity> mScrollbarActivity;
|
|
nsTArray<nsIScrollPositionListener*> mListeners;
|
|
nsIAtom* mLastScrollOrigin;
|
|
bool mAllowScrollOriginDowngrade;
|
|
nsIAtom* 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 mSupppressScrollbarUpdate:1;
|
|
// If true, we skipped a scrollbar layout due to mSupppressScrollbarUpdate
|
|
// being set at some point. That means we should lay out scrollbars even if
|
|
// it might not strictly be needed next time mSupppressScrollbarUpdate 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::ComputeFrameMetrics.
|
|
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 we don't want the scrollbar to repaint itself right now.
|
|
bool mSuppressScrollbarRepaints:1;
|
|
|
|
bool mScrollsClipOnUnscrolledOutOfFlow: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,
|
|
nsIAtom *aOrigin, // nullptr indicates "other" origin
|
|
const nsRect* aRange,
|
|
nsIScrollbarMediator::ScrollSnapMode aSnap
|
|
= nsIScrollbarMediator::DISABLE_SNAP);
|
|
|
|
void CompleteAsyncScroll(const nsRect &aRange, nsIAtom* aOrigin = nullptr);
|
|
|
|
bool HasPluginFrames();
|
|
bool HasPerspective() const;
|
|
bool HasBgAttachmentLocal() const;
|
|
uint8_t GetScrolledFrameDir() const;
|
|
|
|
// Removes any RefreshDriver observers we might have registered.
|
|
void RemoveObservers();
|
|
|
|
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,
|
|
nsStyleContext* aContext,
|
|
bool aIsRoot);
|
|
|
|
NS_DECL_QUERYFRAME
|
|
NS_DECL_FRAMEARENA_HELPERS
|
|
|
|
virtual mozilla::WritingMode GetWritingMode() const override
|
|
{
|
|
if (mHelper.mScrolledFrame) {
|
|
return mHelper.mScrolledFrame->GetWritingMode();
|
|
}
|
|
return nsIFrame::GetWritingMode();
|
|
}
|
|
|
|
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(nsRenderingContext *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(nsRenderingContext *aRenderingContext) override;
|
|
virtual nscoord GetPrefISize(nsRenderingContext *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) 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::ScrollStyles GetScrollStyles() const override {
|
|
return mHelper.GetScrollStylesFromFrame();
|
|
}
|
|
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,
|
|
nsRenderingContext* aRC) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return GetDesiredScrollbarSizes(&bls);
|
|
}
|
|
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
|
|
nsRenderingContext* 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,
|
|
nsIAtom* 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, nsIAtom* 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 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 nsIAtom* LastScrollOrigin() override {
|
|
return mHelper.LastScrollOrigin();
|
|
}
|
|
virtual void AllowScrollOriginDowngrade() override {
|
|
mHelper.AllowScrollOriginDowngrade();
|
|
}
|
|
virtual nsIAtom* 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(
|
|
Layer* aLayer, nsIFrame* aContainerReferenceFrame,
|
|
const ContainerLayerParameters& aParameters,
|
|
const mozilla::DisplayItemClip* aClip) const override
|
|
{
|
|
return mHelper.ComputeScrollMetadata(aLayer, aContainerReferenceFrame, aParameters, aClip);
|
|
}
|
|
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* aDirtyRect,
|
|
bool aAllowCreateDisplayPort) override {
|
|
return mHelper.DecideScrollableLayer(aBuilder, aDirtyRect, aAllowCreateDisplayPort);
|
|
}
|
|
virtual void NotifyApproximateFrameVisibilityUpdate() override {
|
|
mHelper.NotifyApproximateFrameVisibilityUpdate();
|
|
}
|
|
virtual bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(nsRect* aDisplayPort) override {
|
|
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(aDisplayPort);
|
|
}
|
|
void TriggerDisplayPortExpiration() override {
|
|
mHelper.TriggerDisplayPortExpiration();
|
|
}
|
|
|
|
// nsIStatefulFrame
|
|
NS_IMETHOD SaveState(nsPresState** aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
*aState = mHelper.SaveState();
|
|
return NS_OK;
|
|
}
|
|
NS_IMETHOD RestoreState(nsPresState* aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
mHelper.RestoreState(aState);
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Get the "type" of the frame
|
|
*
|
|
* @see nsGkAtoms::scrollFrame
|
|
*/
|
|
virtual nsIAtom* GetType() const override;
|
|
|
|
// 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 SetScrollsClipOnUnscrolledOutOfFlow() override {
|
|
mHelper.SetScrollsClipOnUnscrolledOutOfFlow();
|
|
}
|
|
|
|
ScrollSnapInfo GetScrollSnapInfo() const override {
|
|
return mHelper.GetScrollSnapInfo();
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
#ifdef ACCESSIBILITY
|
|
virtual mozilla::a11y::AccType AccessibleType() override;
|
|
#endif
|
|
|
|
protected:
|
|
nsHTMLScrollFrame(nsStyleContext* aContext, bool aIsRoot);
|
|
void SetSuppressScrollbarUpdate(bool aSuppress) {
|
|
mHelper.mSupppressScrollbarUpdate = aSuppress;
|
|
}
|
|
bool GuessHScrollbarNeeded(const ScrollReflowInput& aState);
|
|
bool GuessVScrollbarNeeded(const ScrollReflowInput& aState);
|
|
|
|
bool IsScrollbarUpdateSuppressed() const {
|
|
return mHelper.mSupppressScrollbarUpdate;
|
|
}
|
|
|
|
// 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
|
|
|
|
friend nsXULScrollFrame* NS_NewXULScrollFrame(nsIPresShell* aPresShell,
|
|
nsStyleContext* aContext,
|
|
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(nsRenderingContext *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) 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::ScrollStyles GetScrollStyles() const override {
|
|
return mHelper.GetScrollStylesFromFrame();
|
|
}
|
|
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,
|
|
nsRenderingContext* aRC) override {
|
|
nsBoxLayoutState bls(aPresContext, aRC, 0);
|
|
return GetDesiredScrollbarSizes(&bls);
|
|
}
|
|
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
|
|
nsRenderingContext* 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,
|
|
nsIAtom* 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, nsIAtom* 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 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 nsIAtom* LastScrollOrigin() override {
|
|
return mHelper.LastScrollOrigin();
|
|
}
|
|
virtual void AllowScrollOriginDowngrade() override {
|
|
mHelper.AllowScrollOriginDowngrade();
|
|
}
|
|
virtual nsIAtom* 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(
|
|
Layer* aLayer, nsIFrame* aContainerReferenceFrame,
|
|
const ContainerLayerParameters& aParameters,
|
|
const mozilla::DisplayItemClip* aClip) const override
|
|
{
|
|
return mHelper.ComputeScrollMetadata(aLayer, aContainerReferenceFrame, aParameters, aClip);
|
|
}
|
|
virtual bool IsIgnoringViewportClipping() const override {
|
|
return mHelper.IsIgnoringViewportClipping();
|
|
}
|
|
virtual void MarkScrollbarsDirtyForReflow() const override {
|
|
mHelper.MarkScrollbarsDirtyForReflow();
|
|
}
|
|
|
|
// nsIStatefulFrame
|
|
NS_IMETHOD SaveState(nsPresState** aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
*aState = mHelper.SaveState();
|
|
return NS_OK;
|
|
}
|
|
NS_IMETHOD RestoreState(nsPresState* aState) override {
|
|
NS_ENSURE_ARG_POINTER(aState);
|
|
mHelper.RestoreState(aState);
|
|
return NS_OK;
|
|
}
|
|
|
|
/**
|
|
* Get the "type" of the frame
|
|
*
|
|
* @see nsGkAtoms::scrollFrame
|
|
*/
|
|
virtual nsIAtom* GetType() const override;
|
|
|
|
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 SetScrollsClipOnUnscrolledOutOfFlow() override {
|
|
mHelper.SetScrollsClipOnUnscrolledOutOfFlow();
|
|
}
|
|
virtual bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
|
|
nsRect* aDirtyRect,
|
|
bool aAllowCreateDisplayPort) override {
|
|
return mHelper.DecideScrollableLayer(aBuilder, aDirtyRect, aAllowCreateDisplayPort);
|
|
}
|
|
virtual void NotifyApproximateFrameVisibilityUpdate() override {
|
|
mHelper.NotifyApproximateFrameVisibilityUpdate();
|
|
}
|
|
virtual bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(nsRect* aDisplayPort) override {
|
|
return mHelper.GetDisplayPortAtLastApproximateFrameVisibilityUpdate(aDisplayPort);
|
|
}
|
|
void TriggerDisplayPortExpiration() override {
|
|
mHelper.TriggerDisplayPortExpiration();
|
|
}
|
|
|
|
ScrollSnapInfo GetScrollSnapInfo() const override {
|
|
return mHelper.GetScrollSnapInfo();
|
|
}
|
|
|
|
#ifdef DEBUG_FRAME_DUMP
|
|
virtual nsresult GetFrameName(nsAString& aResult) const override;
|
|
#endif
|
|
|
|
protected:
|
|
nsXULScrollFrame(nsStyleContext* aContext, 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___ */
|