gecko-dev/layout/svg/SVGFELeafFrame.cpp

96 строки
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
// Keep in (case-insensitive) order:
#include "nsContainerFrame.h"
#include "nsFrame.h"
#include "nsGkAtoms.h"
#include "SVGObserverUtils.h"
#include "nsSVGFilters.h"
/*
* This frame is used by filter primitive elements that don't
* have special child elements that provide parameters.
*/
class SVGFELeafFrame final : public nsFrame
{
friend nsIFrame*
NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
explicit SVGFELeafFrame(nsStyleContext* aContext)
: nsFrame(aContext, kClassID)
{
AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS(SVGFELeafFrame)
#ifdef DEBUG
virtual void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
#endif
virtual bool IsFrameOfType(uint32_t aFlags) const override
{
return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
}
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override
{
return MakeFrameName(NS_LITERAL_STRING("SVGFELeaf"), aResult);
}
#endif
virtual nsresult AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) override;
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override {
// We don't maintain a visual overflow rect
return false;
}
};
nsIFrame*
NS_NewSVGFELeafFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) SVGFELeafFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(SVGFELeafFrame)
#ifdef DEBUG
void
SVGFELeafFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eFILTER),
"Trying to construct an SVGFELeafFrame for a "
"content element that doesn't support the right interfaces");
nsFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsresult
SVGFELeafFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType)
{
nsSVGFE *element = static_cast<nsSVGFE*>(GetContent());
if (element->AttributeAffectsRendering(aNameSpaceID, aAttribute)) {
MOZ_ASSERT(GetParent()->IsSVGFilterFrame(),
"Observers observe the filter, so that's what we must invalidate");
SVGObserverUtils::InvalidateDirectRenderingObservers(GetParent());
}
return nsFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}