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gecko-dev/layout/generic/nsGfxScrollFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* rendering object to wrap rendering objects that should be scrollable */
#ifndef nsGfxScrollFrame_h___
#define nsGfxScrollFrame_h___
#include "mozilla/Attributes.h"
#include "nsContainerFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "nsBoxFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIStatefulFrame.h"
#include "nsThreadUtils.h"
#include "nsIReflowCallback.h"
#include "nsBoxLayoutState.h"
#include "nsQueryFrame.h"
#include "nsExpirationTracker.h"
class nsPresContext;
class nsIPresShell;
class nsIContent;
class nsIAtom;
class nsIScrollFrameInternal;
class nsPresState;
class nsIScrollPositionListener;
struct ScrollReflowState;
namespace mozilla {
namespace layout {
class ScrollbarActivity;
}
}
// When set, the next scroll operation on the scrollframe will invalidate its
// entire contents. Useful for text-overflow.
// This bit is cleared after each time the scrollframe is scrolled. Whoever
// needs to set it should set it again on each paint.
#define NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL NS_FRAME_STATE_BIT(20)
class nsGfxScrollFrameInner : public nsIReflowCallback {
public:
typedef mozilla::CSSIntPoint CSSIntPoint;
typedef mozilla::layout::ScrollbarActivity ScrollbarActivity;
class AsyncScroll;
nsGfxScrollFrameInner(nsContainerFrame* aOuter, bool aIsRoot);
~nsGfxScrollFrameInner();
mozilla::ScrollbarStyles GetScrollbarStylesFromFrame() const;
// If a child frame was added or removed on the scrollframe,
// reload our child frame list.
// We need this if a scrollbar frame is recreated.
void ReloadChildFrames();
nsresult CreateAnonymousContent(
nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements);
void AppendAnonymousContentTo(nsBaseContentList& aElements, uint32_t aFilter);
nsresult FireScrollPortEvent();
void PostOverflowEvent();
void Destroy();
bool ShouldBuildLayer() const;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
void AppendScrollPartsTo(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists,
bool& aCreateLayer,
bool aPositioned);
bool GetBorderRadii(nscoord aRadii[8]) const;
// nsIReflowCallback
virtual bool ReflowFinished() MOZ_OVERRIDE;
virtual void ReflowCallbackCanceled() MOZ_OVERRIDE;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Called when the 'curpos' attribute on one of the scrollbars changes.
*/
void CurPosAttributeChanged(nsIContent* aChild);
void PostScrollEvent();
void FireScrollEvent();
void PostScrolledAreaEvent();
void FireScrolledAreaEvent();
class ScrollEvent : public nsRunnable {
public:
NS_DECL_NSIRUNNABLE
ScrollEvent(nsGfxScrollFrameInner *inner) : mInner(inner) {}
void Revoke() { mInner = nullptr; }
private:
nsGfxScrollFrameInner *mInner;
};
class AsyncScrollPortEvent : public nsRunnable {
public:
NS_DECL_NSIRUNNABLE
AsyncScrollPortEvent(nsGfxScrollFrameInner *inner) : mInner(inner) {}
void Revoke() { mInner = nullptr; }
private:
nsGfxScrollFrameInner *mInner;
};
class ScrolledAreaEvent : public nsRunnable {
public:
NS_DECL_NSIRUNNABLE
ScrolledAreaEvent(nsGfxScrollFrameInner *inner) : mInner(inner) {}
void Revoke() { mInner = nullptr; }
private:
nsGfxScrollFrameInner *mInner;
};
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void FinishReflowForScrollbar(nsIContent* aContent, nscoord aMinXY,
nscoord aMaxXY, nscoord aCurPosXY,
nscoord aPageIncrement,
nscoord aIncrement);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void SetScrollbarEnabled(nsIContent* aContent, nscoord aMaxPos);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void SetCoordAttribute(nsIContent* aContent, nsIAtom* aAtom, nscoord aSize);
nscoord GetCoordAttribute(nsIFrame* aFrame, nsIAtom* aAtom, nscoord aDefaultValue,
nscoord* aRangeStart, nscoord* aRangeLength);
/**
* @note This method might destroy the frame, pres shell and other objects.
* Update scrollbar curpos attributes to reflect current scroll position
*/
void UpdateScrollbarPosition();
nsRect GetScrollPortRect() const { return mScrollPort; }
nsPoint GetScrollPosition() const {
return mScrollPort.TopLeft() - mScrolledFrame->GetPosition();
}
/**
* For LTR frames, the logical scroll position is the offset of the top left
* corner of the frame from the top left corner of the scroll port (same as
* GetScrollPosition).
* For RTL frames, it is the offset of the top right corner of the frame from
* the top right corner of the scroll port
*/
nsPoint GetLogicalScrollPosition() const {
nsPoint pt;
pt.x = IsLTR() ?
mScrollPort.x - mScrolledFrame->GetPosition().x :
mScrollPort.XMost() - mScrolledFrame->GetRect().XMost();
pt.y = mScrollPort.y - mScrolledFrame->GetPosition().y;
return pt;
}
nsRect GetScrollRange() const;
// Get the scroll range assuming the scrollport has size (aWidth, aHeight).
nsRect GetScrollRange(nscoord aWidth, nscoord aHeight) const;
nsSize GetScrollPositionClampingScrollPortSize() const;
protected:
nsRect GetScrollRangeForClamping() const;
public:
static void AsyncScrollCallback(void* anInstance, mozilla::TimeStamp aTime);
/**
* @note This method might destroy the frame, pres shell and other objects.
* aRange is the range of allowable scroll positions around the desired
* aScrollPosition. Null means only aScrollPosition is allowed.
* This is a closed-ended range --- aRange.XMost()/aRange.YMost() are allowed.
*/
void ScrollTo(nsPoint aScrollPosition, nsIScrollableFrame::ScrollMode aMode,
const nsRect* aRange = nullptr) {
ScrollToWithOrigin(aScrollPosition, aMode, nsGkAtoms::other, aRange);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition);
CSSIntPoint GetScrollPositionCSSPixels();
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToImpl(nsPoint aScrollPosition, const nsRect& aRange);
void ScrollVisual(nsPoint aOldScrolledFramePosition);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollBy(nsIntPoint aDelta, nsIScrollableFrame::ScrollUnit aUnit,
nsIScrollableFrame::ScrollMode aMode, nsIntPoint* aOverflow, nsIAtom *aOrigin = nullptr);
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToRestoredPosition();
nsSize GetLineScrollAmount() const;
nsSize GetPageScrollAmount() const;
nsPresState* SaveState();
void RestoreState(nsPresState* aState);
nsIFrame* GetScrolledFrame() const { return mScrolledFrame; }
nsIFrame* GetScrollbarBox(bool aVertical) const {
return aVertical ? mVScrollbarBox : mHScrollbarBox;
}
void AddScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.AppendElement(aListener);
}
void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.RemoveElement(aListener);
}
static void SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible);
/**
* GetScrolledRect is designed to encapsulate deciding which
* directions of overflow should be reachable by scrolling and which
* should not. Callers should NOT depend on it having any particular
* behavior (although nsXULScrollFrame currently does).
*
* This should only be called when the scrolled frame has been
* reflowed with the scroll port size given in mScrollPort.
*
* Currently it allows scrolling down and to the right for
* nsHTMLScrollFrames with LTR directionality and for all
* nsXULScrollFrames, and allows scrolling down and to the left for
* nsHTMLScrollFrames with RTL directionality.
*/
nsRect GetScrolledRect() const;
/**
* GetScrolledRectInternal is designed to encapsulate deciding which
* directions of overflow should be reachable by scrolling and which
* should not. Callers should NOT depend on it having any particular
* behavior (although nsXULScrollFrame currently does).
*
* Currently it allows scrolling down and to the right for
* nsHTMLScrollFrames with LTR directionality and for all
* nsXULScrollFrames, and allows scrolling down and to the left for
* nsHTMLScrollFrames with RTL directionality.
*/
nsRect GetScrolledRectInternal(const nsRect& aScrolledOverflowArea,
const nsSize& aScrollPortSize) const;
uint32_t GetScrollbarVisibility() const {
return (mHasVerticalScrollbar ? nsIScrollableFrame::VERTICAL : 0) |
(mHasHorizontalScrollbar ? nsIScrollableFrame::HORIZONTAL : 0);
}
nsMargin GetActualScrollbarSizes() const;
nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState);
nscoord GetNondisappearingScrollbarWidth(nsBoxLayoutState* aState);
bool IsLTR() const;
bool IsScrollbarOnRight() const;
bool IsScrollingActive() const { return mScrollingActive || ShouldBuildLayer(); }
void ResetScrollPositionForLayerPixelAlignment()
{
mScrollPosForLayerPixelAlignment = GetScrollPosition();
}
bool UpdateOverflow();
// adjust the scrollbar rectangle aRect to account for any visible resizer.
// aHasResizer specifies if there is a content resizer, however this method
// will also check if a widget resizer is present as well.
void AdjustScrollbarRectForResizer(nsIFrame* aFrame, nsPresContext* aPresContext,
nsRect& aRect, bool aHasResizer, bool aVertical);
// returns true if a resizer should be visible
bool HasResizer() { return mResizerBox && !mCollapsedResizer; }
void LayoutScrollbars(nsBoxLayoutState& aState,
const nsRect& aContentArea,
const nsRect& aOldScrollArea);
bool IsIgnoringViewportClipping() const;
bool ShouldClampScrollPosition() const;
bool IsAlwaysActive() const;
void MarkActive();
void MarkInactive();
nsExpirationState* GetExpirationState() { return &mActivityExpirationState; }
void ScheduleSyntheticMouseMove();
static void ScrollActivityCallback(nsITimer *aTimer, void* anInstance);
void HandleScrollbarStyleSwitching();
// owning references to the nsIAnonymousContentCreator-built content
nsCOMPtr<nsIContent> mHScrollbarContent;
nsCOMPtr<nsIContent> mVScrollbarContent;
nsCOMPtr<nsIContent> mScrollCornerContent;
nsCOMPtr<nsIContent> mResizerContent;
nsRevocableEventPtr<ScrollEvent> mScrollEvent;
nsRevocableEventPtr<AsyncScrollPortEvent> mAsyncScrollPortEvent;
nsRevocableEventPtr<ScrolledAreaEvent> mScrolledAreaEvent;
nsIFrame* mHScrollbarBox;
nsIFrame* mVScrollbarBox;
nsIFrame* mScrolledFrame;
nsIFrame* mScrollCornerBox;
nsIFrame* mResizerBox;
nsContainerFrame* mOuter;
nsRefPtr<AsyncScroll> mAsyncScroll;
nsRefPtr<ScrollbarActivity> mScrollbarActivity;
nsTArray<nsIScrollPositionListener*> mListeners;
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 image visibility.
nsPoint mLastUpdateImagesPos;
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 mScrollingActive:1;
// If true, the resizer is collapsed and not displayed
bool mCollapsedResizer:1;
// If true, the layer should always be active because we always build a layer.
// Used for asynchronous scrolling.
bool mShouldBuildLayer:1;
// True if this frame has been scrolled at least once
bool mHasBeenScrolled:1;
protected:
/**
* @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);
};
/**
* 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::CSSIntPoint CSSIntPoint;
friend nsIFrame* NS_NewHTMLScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, bool aIsRoot);
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
// Called to set the child frames. We typically have three: the scroll area,
// the vertical scrollbar, and the horizontal scrollbar.
NS_IMETHOD SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) MOZ_OVERRIDE;
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) MOZ_OVERRIDE {
mInner.BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
bool TryLayout(ScrollReflowState* aState,
nsHTMLReflowMetrics* aKidMetrics,
bool aAssumeVScroll, bool aAssumeHScroll,
bool aForce, nsresult* aResult);
bool ScrolledContentDependsOnHeight(ScrollReflowState* aState);
nsresult ReflowScrolledFrame(ScrollReflowState* aState,
bool aAssumeHScroll,
bool aAssumeVScroll,
nsHTMLReflowMetrics* aMetrics,
bool aFirstPass);
nsresult ReflowContents(ScrollReflowState* aState,
const nsHTMLReflowMetrics& aDesiredSize);
void PlaceScrollArea(const ScrollReflowState& aState,
const nsPoint& aScrollPosition);
nscoord GetIntrinsicVScrollbarWidth(nsRenderingContext *aRenderingContext);
virtual bool GetBorderRadii(nscoord aRadii[8]) const MOZ_OVERRIDE {
return mInner.GetBorderRadii(aRadii);
}
virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
NS_IMETHOD GetPadding(nsMargin& aPadding) MOZ_OVERRIDE;
virtual bool IsCollapsed() MOZ_OVERRIDE;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus) MOZ_OVERRIDE;
virtual bool UpdateOverflow() MOZ_OVERRIDE {
return mInner.UpdateOverflow();
}
// Because there can be only one child frame, these two function return
// NS_ERROR_FAILURE
NS_IMETHOD AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) MOZ_OVERRIDE;
NS_IMETHOD InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList) MOZ_OVERRIDE;
virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
NS_IMETHOD RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame) MOZ_OVERRIDE;
virtual nsIScrollableFrame* GetScrollTargetFrame() MOZ_OVERRIDE {
return this;
}
virtual nsIFrame* GetContentInsertionFrame() MOZ_OVERRIDE {
return mInner.GetScrolledFrame()->GetContentInsertionFrame();
}
virtual bool DoesClipChildren() MOZ_OVERRIDE { return true; }
virtual nsSplittableType GetSplittableType() const MOZ_OVERRIDE;
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild) MOZ_OVERRIDE
{ nsPoint pt = aChild->GetPosition();
if (aChild == mInner.GetScrolledFrame()) pt += GetScrollPosition();
return pt;
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
uint32_t aFilter) MOZ_OVERRIDE;
// nsIScrollbarOwner
virtual nsIFrame* GetScrollbarBox(bool aVertical) MOZ_OVERRIDE {
return mInner.GetScrollbarBox(aVertical);
}
// nsIScrollableFrame
virtual nsIFrame* GetScrolledFrame() const MOZ_OVERRIDE {
return mInner.GetScrolledFrame();
}
virtual mozilla::ScrollbarStyles GetScrollbarStyles() const {
return mInner.GetScrollbarStylesFromFrame();
}
virtual uint32_t GetScrollbarVisibility() const MOZ_OVERRIDE {
return mInner.GetScrollbarVisibility();
}
virtual nsMargin GetActualScrollbarSizes() const MOZ_OVERRIDE {
return mInner.GetActualScrollbarSizes();
}
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) MOZ_OVERRIDE {
return mInner.GetDesiredScrollbarSizes(aState);
}
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
nsRenderingContext* aRC) MOZ_OVERRIDE {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
nsRenderingContext* aRC) MOZ_OVERRIDE {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return mInner.GetNondisappearingScrollbarWidth(&bls);
}
virtual nsRect GetScrolledRect() const MOZ_OVERRIDE {
return mInner.GetScrolledRect();
}
virtual nsRect GetScrollPortRect() const MOZ_OVERRIDE {
return mInner.GetScrollPortRect();
}
virtual nsPoint GetScrollPosition() const MOZ_OVERRIDE {
return mInner.GetScrollPosition();
}
virtual nsPoint GetLogicalScrollPosition() const MOZ_OVERRIDE {
return mInner.GetLogicalScrollPosition();
}
virtual nsRect GetScrollRange() const MOZ_OVERRIDE {
return mInner.GetScrollRange();
}
virtual nsSize GetScrollPositionClampingScrollPortSize() const MOZ_OVERRIDE {
return mInner.GetScrollPositionClampingScrollPortSize();
}
virtual nsSize GetLineScrollAmount() const MOZ_OVERRIDE {
return mInner.GetLineScrollAmount();
}
virtual nsSize GetPageScrollAmount() const MOZ_OVERRIDE {
return mInner.GetPageScrollAmount();
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
const nsRect* aRange = nullptr) MOZ_OVERRIDE {
mInner.ScrollTo(aScrollPosition, aMode, aRange);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition) MOZ_OVERRIDE {
mInner.ScrollToCSSPixels(aScrollPosition);
}
virtual void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition) MOZ_OVERRIDE {
mInner.ScrollToCSSPixelsApproximate(aScrollPosition);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual CSSIntPoint GetScrollPositionCSSPixels() MOZ_OVERRIDE {
return mInner.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) MOZ_OVERRIDE {
mInner.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollToRestoredPosition() MOZ_OVERRIDE {
mInner.ScrollToRestoredPosition();
}
virtual void AddScrollPositionListener(nsIScrollPositionListener* aListener) MOZ_OVERRIDE {
mInner.AddScrollPositionListener(aListener);
}
virtual void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) MOZ_OVERRIDE {
mInner.RemoveScrollPositionListener(aListener);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void CurPosAttributeChanged(nsIContent* aChild) MOZ_OVERRIDE {
mInner.CurPosAttributeChanged(aChild);
}
NS_IMETHOD PostScrolledAreaEventForCurrentArea() MOZ_OVERRIDE {
mInner.PostScrolledAreaEvent();
return NS_OK;
}
virtual bool IsScrollingActive() MOZ_OVERRIDE {
return mInner.IsScrollingActive();
}
virtual void ResetScrollPositionForLayerPixelAlignment() MOZ_OVERRIDE {
mInner.ResetScrollPositionForLayerPixelAlignment();
}
virtual bool DidHistoryRestore() MOZ_OVERRIDE {
return mInner.mDidHistoryRestore;
}
virtual void ClearDidHistoryRestore() MOZ_OVERRIDE {
mInner.mDidHistoryRestore = false;
}
// nsIStatefulFrame
NS_IMETHOD SaveState(nsPresState** aState) MOZ_OVERRIDE {
NS_ENSURE_ARG_POINTER(aState);
*aState = mInner.SaveState();
return NS_OK;
}
NS_IMETHOD RestoreState(nsPresState* aState) MOZ_OVERRIDE {
NS_ENSURE_ARG_POINTER(aState);
mInner.RestoreState(aState);
return NS_OK;
}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::scrollFrame
*/
virtual nsIAtom* GetType() const MOZ_OVERRIDE;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
#endif
#ifdef ACCESSIBILITY
virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
#endif
protected:
nsHTMLScrollFrame(nsIPresShell* aShell, nsStyleContext* aContext, bool aIsRoot);
void SetSuppressScrollbarUpdate(bool aSuppress) {
mInner.mSupppressScrollbarUpdate = aSuppress;
}
bool GuessHScrollbarNeeded(const ScrollReflowState& aState);
bool GuessVScrollbarNeeded(const ScrollReflowState& aState);
bool IsScrollbarUpdateSuppressed() const {
return mInner.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 height/min-height/max-height
* should NOT be propagated to child content.
* nsListControlFrame uses this.
*/
virtual bool ShouldPropagateComputedHeightToScrolledContent() const { return true; }
private:
friend class nsGfxScrollFrameInner;
nsGfxScrollFrameInner mInner;
};
/**
* 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 : public nsBoxFrame,
public nsIScrollableFrame,
public nsIAnonymousContentCreator,
public nsIStatefulFrame {
public:
typedef mozilla::CSSIntPoint CSSIntPoint;
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
friend nsIFrame* NS_NewXULScrollFrame(nsIPresShell* aPresShell, nsStyleContext* aContext,
bool aIsRoot, bool aClipAllDescendants);
// Called to set the child frames. We typically have three: the scroll area,
// the vertical scrollbar, and the horizontal scrollbar.
NS_IMETHOD SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) MOZ_OVERRIDE;
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) MOZ_OVERRIDE {
mInner.BuildDisplayList(aBuilder, aDirtyRect, aLists);
}
// XXXldb Is this actually used?
#if 0
virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
#endif
virtual bool UpdateOverflow() MOZ_OVERRIDE {
return mInner.UpdateOverflow();
}
// Because there can be only one child frame, these two function return
// NS_ERROR_FAILURE
NS_IMETHOD AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) MOZ_OVERRIDE;
NS_IMETHOD InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList) MOZ_OVERRIDE;
virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
NS_IMETHOD RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame) MOZ_OVERRIDE;
virtual nsIScrollableFrame* GetScrollTargetFrame() MOZ_OVERRIDE {
return this;
}
virtual nsIFrame* GetContentInsertionFrame() MOZ_OVERRIDE {
return mInner.GetScrolledFrame()->GetContentInsertionFrame();
}
virtual bool DoesClipChildren() MOZ_OVERRIDE { return true; }
virtual nsSplittableType GetSplittableType() const MOZ_OVERRIDE;
virtual nsPoint GetPositionOfChildIgnoringScrolling(nsIFrame* aChild) MOZ_OVERRIDE
{ nsPoint pt = aChild->GetPosition();
if (aChild == mInner.GetScrolledFrame())
pt += mInner.GetLogicalScrollPosition();
return pt;
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
uint32_t aFilter) MOZ_OVERRIDE;
virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
virtual nscoord GetBoxAscent(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState) MOZ_OVERRIDE;
NS_IMETHOD GetPadding(nsMargin& aPadding) MOZ_OVERRIDE;
virtual bool GetBorderRadii(nscoord aRadii[8]) const MOZ_OVERRIDE {
return mInner.GetBorderRadii(aRadii);
}
nsresult Layout(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 AdjustReflowStateForPrintPreview(nsBoxLayoutState& aState, bool& aSetBack);
static void AdjustReflowStateBack(nsBoxLayoutState& aState, bool aSetBack);
// nsIScrollbarOwner
virtual nsIFrame* GetScrollbarBox(bool aVertical) MOZ_OVERRIDE {
return mInner.GetScrollbarBox(aVertical);
}
// nsIScrollableFrame
virtual nsIFrame* GetScrolledFrame() const MOZ_OVERRIDE {
return mInner.GetScrolledFrame();
}
virtual mozilla::ScrollbarStyles GetScrollbarStyles() const {
return mInner.GetScrollbarStylesFromFrame();
}
virtual uint32_t GetScrollbarVisibility() const MOZ_OVERRIDE {
return mInner.GetScrollbarVisibility();
}
virtual nsMargin GetActualScrollbarSizes() const MOZ_OVERRIDE {
return mInner.GetActualScrollbarSizes();
}
virtual nsMargin GetDesiredScrollbarSizes(nsBoxLayoutState* aState) MOZ_OVERRIDE {
return mInner.GetDesiredScrollbarSizes(aState);
}
virtual nsMargin GetDesiredScrollbarSizes(nsPresContext* aPresContext,
nsRenderingContext* aRC) MOZ_OVERRIDE {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return GetDesiredScrollbarSizes(&bls);
}
virtual nscoord GetNondisappearingScrollbarWidth(nsPresContext* aPresContext,
nsRenderingContext* aRC) MOZ_OVERRIDE {
nsBoxLayoutState bls(aPresContext, aRC, 0);
return mInner.GetNondisappearingScrollbarWidth(&bls);
}
virtual nsRect GetScrolledRect() const MOZ_OVERRIDE {
return mInner.GetScrolledRect();
}
virtual nsRect GetScrollPortRect() const MOZ_OVERRIDE {
return mInner.GetScrollPortRect();
}
virtual nsPoint GetScrollPosition() const MOZ_OVERRIDE {
return mInner.GetScrollPosition();
}
virtual nsPoint GetLogicalScrollPosition() const MOZ_OVERRIDE {
return mInner.GetLogicalScrollPosition();
}
virtual nsRect GetScrollRange() const MOZ_OVERRIDE {
return mInner.GetScrollRange();
}
virtual nsSize GetScrollPositionClampingScrollPortSize() const MOZ_OVERRIDE {
return mInner.GetScrollPositionClampingScrollPortSize();
}
virtual nsSize GetLineScrollAmount() const MOZ_OVERRIDE {
return mInner.GetLineScrollAmount();
}
virtual nsSize GetPageScrollAmount() const MOZ_OVERRIDE {
return mInner.GetPageScrollAmount();
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
const nsRect* aRange = nullptr) MOZ_OVERRIDE {
mInner.ScrollTo(aScrollPosition, aMode, aRange);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition) MOZ_OVERRIDE {
mInner.ScrollToCSSPixels(aScrollPosition);
}
virtual void ScrollToCSSPixelsApproximate(const mozilla::CSSPoint& aScrollPosition) MOZ_OVERRIDE {
mInner.ScrollToCSSPixelsApproximate(aScrollPosition);
}
virtual CSSIntPoint GetScrollPositionCSSPixels() MOZ_OVERRIDE {
return mInner.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) MOZ_OVERRIDE {
mInner.ScrollBy(aDelta, aUnit, aMode, aOverflow, aOrigin);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void ScrollToRestoredPosition() MOZ_OVERRIDE {
mInner.ScrollToRestoredPosition();
}
virtual void AddScrollPositionListener(nsIScrollPositionListener* aListener) MOZ_OVERRIDE {
mInner.AddScrollPositionListener(aListener);
}
virtual void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) MOZ_OVERRIDE {
mInner.RemoveScrollPositionListener(aListener);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
virtual void CurPosAttributeChanged(nsIContent* aChild) MOZ_OVERRIDE {
mInner.CurPosAttributeChanged(aChild);
}
NS_IMETHOD PostScrolledAreaEventForCurrentArea() MOZ_OVERRIDE {
mInner.PostScrolledAreaEvent();
return NS_OK;
}
virtual bool IsScrollingActive() MOZ_OVERRIDE {
return mInner.IsScrollingActive();
}
virtual void ResetScrollPositionForLayerPixelAlignment() MOZ_OVERRIDE {
mInner.ResetScrollPositionForLayerPixelAlignment();
}
virtual bool DidHistoryRestore() MOZ_OVERRIDE {
return mInner.mDidHistoryRestore;
}
virtual void ClearDidHistoryRestore() MOZ_OVERRIDE {
mInner.mDidHistoryRestore = false;
}
// nsIStatefulFrame
NS_IMETHOD SaveState(nsPresState** aState) MOZ_OVERRIDE {
NS_ENSURE_ARG_POINTER(aState);
*aState = mInner.SaveState();
return NS_OK;
}
NS_IMETHOD RestoreState(nsPresState* aState) MOZ_OVERRIDE {
NS_ENSURE_ARG_POINTER(aState);
mInner.RestoreState(aState);
return NS_OK;
}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::scrollFrame
*/
virtual nsIAtom* GetType() const MOZ_OVERRIDE;
virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
{
// Override bogus IsFrameOfType in nsBoxFrame.
if (aFlags & (nsIFrame::eReplacedContainsBlock | nsIFrame::eReplaced))
return false;
return nsBoxFrame::IsFrameOfType(aFlags);
}
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
#endif
protected:
nsXULScrollFrame(nsIPresShell* aShell, 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 (!mInner.IsLTR()) {
aRect.x = mInner.mScrollPort.XMost() - aScrollPosition.x - aRect.width;
}
mInner.mScrolledFrame->SetBounds(aState, aRect, aRemoveOverflowAreas);
}
private:
friend class nsGfxScrollFrameInner;
nsGfxScrollFrameInner mInner;
};
#endif /* nsGfxScrollFrame_h___ */
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