gecko-dev/layout/svg/nsSVGStopFrame.cpp

99 lines
3.4 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 "mozilla/ComputedStyle.h"
#include "SVGObserverUtils.h"
using namespace mozilla;
// This is a very simple frame whose only purpose is to capture style change
// events and propagate them to the parent. Most of the heavy lifting is done
// within the nsSVGGradientFrame, which is the parent for this frame
class nsSVGStopFrame : public nsFrame {
friend nsIFrame* NS_NewSVGStopFrame(nsIPresShell* aPresShell,
ComputedStyle* aStyle);
protected:
explicit nsSVGStopFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsFrame(aStyle, aPresContext, kClassID) {
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS(nsSVGStopFrame)
// nsIFrame interface:
#ifdef DEBUG
virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
#endif
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override {}
virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) override;
virtual bool IsFrameOfType(uint32_t aFlags) const override {
if (aFlags & eSupportsContainLayoutAndPaint) {
return false;
}
return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
}
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(NS_LITERAL_STRING("SVGStop"), aResult);
}
#endif
};
//----------------------------------------------------------------------
// Implementation
NS_IMPL_FRAMEARENA_HELPERS(nsSVGStopFrame)
//----------------------------------------------------------------------
// nsIFrame methods:
#ifdef DEBUG
void nsSVGStopFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::stop),
"Content is not a stop element");
nsFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsresult nsSVGStopFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::offset) {
MOZ_ASSERT(
GetParent()->IsSVGLinearGradientFrame() ||
GetParent()->IsSVGRadialGradientFrame(),
"Observers observe the gradient, so that's what we must invalidate");
SVGObserverUtils::InvalidateDirectRenderingObservers(GetParent());
}
return nsFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
// -------------------------------------------------------------------------
// Public functions
// -------------------------------------------------------------------------
nsIFrame* NS_NewSVGStopFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsSVGStopFrame(aStyle, aPresShell->GetPresContext());
}