зеркало из https://github.com/mozilla/gecko-dev.git
269 строки
9.2 KiB
C++
269 строки
9.2 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 that goes directly inside the document's scrollbars */
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#ifndef nsCanvasFrame_h___
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#define nsCanvasFrame_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/EventForwards.h"
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#include "nsContainerFrame.h"
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#include "nsIScrollPositionListener.h"
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#include "nsDisplayList.h"
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#include "nsIAnonymousContentCreator.h"
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class nsPresContext;
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class nsRenderingContext;
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/**
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* Root frame class.
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*
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* The root frame is the parent frame for the document element's frame.
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* It only supports having a single child frame which must be an area
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* frame
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*/
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class nsCanvasFrame MOZ_FINAL : public nsContainerFrame,
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public nsIScrollPositionListener,
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public nsIAnonymousContentCreator
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{
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public:
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explicit nsCanvasFrame(nsStyleContext* aContext)
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: nsContainerFrame(aContext),
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mDoPaintFocus(false),
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mAddedScrollPositionListener(false) {}
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NS_DECL_QUERYFRAME_TARGET(nsCanvasFrame)
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS
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virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
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#ifdef DEBUG
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virtual void SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList) MOZ_OVERRIDE;
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virtual void AppendFrames(ChildListID aListID,
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nsFrameList& aFrameList) MOZ_OVERRIDE;
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virtual void InsertFrames(ChildListID aListID,
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nsIFrame* aPrevFrame,
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nsFrameList& aFrameList) MOZ_OVERRIDE;
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virtual void RemoveFrame(ChildListID aListID,
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nsIFrame* aOldFrame) MOZ_OVERRIDE;
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#endif
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virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
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virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
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virtual void Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus) MOZ_OVERRIDE;
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virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
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{
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return nsContainerFrame::IsFrameOfType(aFlags &
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~(nsIFrame::eCanContainOverflowContainers));
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}
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// nsIAnonymousContentCreator
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virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
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virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, uint32_t aFilter) MOZ_OVERRIDE;
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// Touch caret handle function
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mozilla::dom::Element* GetTouchCaretElement() const
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{
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return mTouchCaretElement;
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}
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// Selection Caret Handle function
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mozilla::dom::Element* GetSelectionCaretsStartElement() const
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{
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return mSelectionCaretsStartElement;
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}
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mozilla::dom::Element* GetSelectionCaretsEndElement() const
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{
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return mSelectionCaretsEndElement;
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}
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mozilla::dom::Element* GetCustomContentContainer() const
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{
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return mCustomContentContainer;
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}
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/** SetHasFocus tells the CanvasFrame to draw with focus ring
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* @param aHasFocus true to show focus ring, false to hide it
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*/
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NS_IMETHOD SetHasFocus(bool aHasFocus);
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists) MOZ_OVERRIDE;
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void PaintFocus(nsRenderingContext& aRenderingContext, nsPoint aPt);
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// nsIScrollPositionListener
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virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) MOZ_OVERRIDE;
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virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) MOZ_OVERRIDE {}
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::canvasFrame
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*/
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virtual nsIAtom* GetType() const MOZ_OVERRIDE;
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virtual nsresult StealFrame(nsIFrame* aChild, bool aForceNormal) MOZ_OVERRIDE
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{
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NS_ASSERTION(!aForceNormal, "No-one should be passing this in here");
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// nsCanvasFrame keeps overflow container continuations of its child
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// frame in main child list
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nsresult rv = nsContainerFrame::StealFrame(aChild, true);
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if (NS_FAILED(rv)) {
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rv = nsContainerFrame::StealFrame(aChild);
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}
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return rv;
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}
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
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#endif
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virtual nsresult GetContentForEvent(mozilla::WidgetEvent* aEvent,
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nsIContent** aContent) MOZ_OVERRIDE;
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nsRect CanvasArea() const;
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protected:
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// Data members
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bool mDoPaintFocus;
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bool mAddedScrollPositionListener;
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nsCOMPtr<mozilla::dom::Element> mTouchCaretElement;
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nsCOMPtr<mozilla::dom::Element> mSelectionCaretsStartElement;
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nsCOMPtr<mozilla::dom::Element> mSelectionCaretsEndElement;
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nsCOMPtr<mozilla::dom::Element> mCustomContentContainer;
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};
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/**
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* Override nsDisplayBackground methods so that we pass aBGClipRect to
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* PaintBackground, covering the whole overflow area.
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* We can also paint an "extra background color" behind the normal
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* background.
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*/
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class nsDisplayCanvasBackgroundColor : public nsDisplayItem {
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public:
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nsDisplayCanvasBackgroundColor(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame)
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: nsDisplayItem(aBuilder, aFrame)
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, mColor(NS_RGBA(0,0,0,0))
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{
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}
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virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
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nsRegion* aVisibleRegion) MOZ_OVERRIDE
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{
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return NS_GET_A(mColor) > 0;
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}
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virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
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bool* aSnap) MOZ_OVERRIDE
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{
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if (NS_GET_A(mColor) == 255) {
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return nsRegion(GetBounds(aBuilder, aSnap));
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}
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return nsRegion();
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}
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virtual bool IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) MOZ_OVERRIDE
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{
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*aColor = mColor;
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return true;
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) MOZ_OVERRIDE
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{
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nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
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*aSnap = true;
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return frame->CanvasArea() + ToReferenceFrame();
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}
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virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
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HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) MOZ_OVERRIDE
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{
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// We need to override so we don't consider border-radius.
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aOutFrames->AppendElement(mFrame);
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}
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virtual nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) MOZ_OVERRIDE
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{
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return new nsDisplayItemBoundsGeometry(this, aBuilder);
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}
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virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
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const nsDisplayItemGeometry* aGeometry,
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nsRegion* aInvalidRegion) MOZ_OVERRIDE
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{
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const nsDisplayItemBoundsGeometry* geometry = static_cast<const nsDisplayItemBoundsGeometry*>(aGeometry);
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ComputeInvalidationRegionDifference(aBuilder, geometry, aInvalidRegion);
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}
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virtual void Paint(nsDisplayListBuilder* aBuilder,
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nsRenderingContext* aCtx) MOZ_OVERRIDE;
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void SetExtraBackgroundColor(nscolor aColor)
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{
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mColor = aColor;
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}
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NS_DISPLAY_DECL_NAME("CanvasBackgroundColor", TYPE_CANVAS_BACKGROUND_COLOR)
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#ifdef MOZ_DUMP_PAINTING
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virtual void WriteDebugInfo(nsACString& aTo) MOZ_OVERRIDE;
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#endif
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private:
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nscolor mColor;
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};
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class nsDisplayCanvasBackgroundImage : public nsDisplayBackgroundImage {
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public:
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nsDisplayCanvasBackgroundImage(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
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uint32_t aLayer, const nsStyleBackground* aBg)
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: nsDisplayBackgroundImage(aBuilder, aFrame, aLayer, aBg)
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{}
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virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) MOZ_OVERRIDE;
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virtual void NotifyRenderingChanged() MOZ_OVERRIDE
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{
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mFrame->Properties().Delete(nsIFrame::CachedBackgroundImage());
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mFrame->Properties().Delete(nsIFrame::CachedBackgroundImageDT());
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}
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virtual bool ShouldFixToViewport(LayerManager* aManager) MOZ_OVERRIDE
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{
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// Put background-attachment:fixed canvas background images in their own
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// compositing layer. Since we know their background painting area can't
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// change (unless the viewport size itself changes), async scrolling
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// will work well.
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return mBackgroundStyle->mLayers[mLayer].mAttachment == NS_STYLE_BG_ATTACHMENT_FIXED &&
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!mBackgroundStyle->mLayers[mLayer].mImage.IsEmpty();
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}
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// We still need to paint a background color as well as an image for this item,
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// so we can't support this yet.
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virtual bool SupportsOptimizingToImage() MOZ_OVERRIDE { return false; }
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NS_DISPLAY_DECL_NAME("CanvasBackgroundImage", TYPE_CANVAS_BACKGROUND_IMAGE)
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};
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class nsDisplayCanvasThemedBackground : public nsDisplayThemedBackground {
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public:
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nsDisplayCanvasThemedBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
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: nsDisplayThemedBackground(aBuilder, aFrame)
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{}
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virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) MOZ_OVERRIDE;
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NS_DISPLAY_DECL_NAME("CanvasThemedBackground", TYPE_CANVAS_THEMED_BACKGROUND)
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};
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#endif /* nsCanvasFrame_h___ */
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