/* -*- 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 that goes directly inside the document's scrollbars */ #ifndef nsCanvasFrame_h___ #define nsCanvasFrame_h___ #include "mozilla/Attributes.h" #include "mozilla/EventForwards.h" #include "nsContainerFrame.h" #include "nsIScrollPositionListener.h" #include "nsDisplayList.h" #include "nsIAnonymousContentCreator.h" class nsPresContext; class nsRenderingContext; /** * Root frame class. * * The root frame is the parent frame for the document element's frame. * It only supports having a single child frame which must be an area * frame. * @note nsCanvasFrame keeps overflow container continuations of its child * frame in the main child list. */ class nsCanvasFrame final : public nsContainerFrame, public nsIScrollPositionListener, public nsIAnonymousContentCreator { public: explicit nsCanvasFrame(nsStyleContext* aContext) : nsContainerFrame(aContext), mDoPaintFocus(false), mAddedScrollPositionListener(false) {} NS_DECL_QUERYFRAME_TARGET(nsCanvasFrame) NS_DECL_QUERYFRAME NS_DECL_FRAMEARENA_HELPERS virtual void DestroyFrom(nsIFrame* aDestructRoot) override; virtual mozilla::WritingMode GetWritingMode() const override { nsIContent* rootElem = GetContent(); if (rootElem) { nsIFrame* rootElemFrame = rootElem->GetPrimaryFrame(); if (rootElemFrame) { return rootElemFrame->GetWritingMode(); } } return nsIFrame::GetWritingMode(); } #ifdef DEBUG 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; #endif virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override; virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override; virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) override; virtual bool IsFrameOfType(uint32_t aFlags) const override { return nsContainerFrame::IsFrameOfType(aFlags & ~(nsIFrame::eCanContainOverflowContainers)); } // nsIAnonymousContentCreator virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override; virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, uint32_t aFilter) override; mozilla::dom::Element* GetCustomContentContainer() const { return mCustomContentContainer; } /** * Unhide the CustomContentContainer. This call only has an effect if * mCustomContentContainer is non-null. */ void ShowCustomContentContainer(); /** * Hide the CustomContentContainer. This call only has an effect if * mCustomContentContainer is non-null. */ void HideCustomContentContainer(); /** SetHasFocus tells the CanvasFrame to draw with focus ring * @param aHasFocus true to show focus ring, false to hide it */ NS_IMETHOD SetHasFocus(bool aHasFocus); virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) override; void PaintFocus(mozilla::gfx::DrawTarget* aRenderingContext, nsPoint aPt); // nsIScrollPositionListener virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) override; virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) override {} /** * Get the "type" of the frame * * @see nsGkAtoms::canvasFrame */ virtual nsIAtom* GetType() const override; #ifdef DEBUG_FRAME_DUMP virtual nsresult GetFrameName(nsAString& aResult) const override; #endif virtual nsresult GetContentForEvent(mozilla::WidgetEvent* aEvent, nsIContent** aContent) override; nsRect CanvasArea() const; protected: // Data members bool mDoPaintFocus; bool mAddedScrollPositionListener; nsCOMPtr<mozilla::dom::Element> mCustomContentContainer; }; /** * Override nsDisplayBackground methods so that we pass aBGClipRect to * PaintBackground, covering the whole overflow area. * We can also paint an "extra background color" behind the normal * background. */ class nsDisplayCanvasBackgroundColor : public nsDisplaySolidColorBase { public: nsDisplayCanvasBackgroundColor(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame) : nsDisplaySolidColorBase(aBuilder, aFrame, NS_RGBA(0,0,0,0)) { } virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder, nsRegion* aVisibleRegion) override { return NS_GET_A(mColor) > 0; } virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override { nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame); *aSnap = true; return frame->CanvasArea() + ToReferenceFrame(); } virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect, HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override { // We need to override so we don't consider border-radius. aOutFrames->AppendElement(mFrame); } virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override; void SetExtraBackgroundColor(nscolor aColor) { mColor = aColor; } NS_DISPLAY_DECL_NAME("CanvasBackgroundColor", TYPE_CANVAS_BACKGROUND_COLOR) #ifdef MOZ_DUMP_PAINTING virtual void WriteDebugInfo(std::stringstream& aStream) override; #endif }; class nsDisplayCanvasBackgroundImage : public nsDisplayBackgroundImage { public: nsDisplayCanvasBackgroundImage(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, uint32_t aLayer, const nsStyleBackground* aBg) : nsDisplayBackgroundImage(aBuilder, aFrame, aLayer, aFrame->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(aFrame), aBg) { if (ShouldFixToViewport(aBuilder)) { mAnimatedGeometryRoot = aBuilder->FindAnimatedGeometryRootFor(this); } } virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override; virtual void NotifyRenderingChanged() override { mFrame->DeleteProperty(nsIFrame::CachedBackgroundImageDT()); } virtual bool ShouldFixToViewport(nsDisplayListBuilder* aBuilder) override { // Put background-attachment:fixed canvas background images in their own // compositing layer. Since we know their background painting area can't // change (unless the viewport size itself changes), async scrolling // will work well. return ShouldTreatAsFixed() && !mBackgroundStyle->mImage.mLayers[mLayer].mImage.IsEmpty(); } // We still need to paint a background color as well as an image for this item, // so we can't support this yet. virtual bool SupportsOptimizingToImage() override { return false; } bool IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder, const nsRect& aClipRect, gfxRect* aDestRect); NS_DISPLAY_DECL_NAME("CanvasBackgroundImage", TYPE_CANVAS_BACKGROUND_IMAGE) }; class nsDisplayCanvasThemedBackground : public nsDisplayThemedBackground { public: nsDisplayCanvasThemedBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) : nsDisplayThemedBackground(aBuilder, aFrame, aFrame->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(aFrame)) {} virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override; NS_DISPLAY_DECL_NAME("CanvasThemedBackground", TYPE_CANVAS_THEMED_BACKGROUND) }; #endif /* nsCanvasFrame_h___ */