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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 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 nsRect& aDirtyRect,
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->Properties().Delete(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___ */
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