зеркало из https://github.com/mozilla/gecko-dev.git
107 строки
3.7 KiB
C++
107 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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// Keep in (case-insensitive) order:
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#include "mozilla/PresShell.h"
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#include "mozilla/dom/SVGSVGElement.h"
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#include "mozilla/dom/SVGViewElement.h"
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#include "nsFrame.h"
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#include "nsGkAtoms.h"
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#include "nsSVGOuterSVGFrame.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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/**
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* While views are not directly rendered in SVG they can be linked to
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* and thereby override attributes of an <svg> element via a fragment
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* identifier. The SVGViewFrame class passes on any attribute changes
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* the view receives to the overridden <svg> element (if there is one).
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**/
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class SVGViewFrame final : public nsFrame {
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friend nsIFrame* NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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protected:
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explicit SVGViewFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
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: nsFrame(aStyle, aPresContext, kClassID) {
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AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
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}
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public:
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NS_DECL_FRAMEARENA_HELPERS(SVGViewFrame)
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#ifdef DEBUG
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virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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#endif
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virtual bool IsFrameOfType(uint32_t aFlags) const override {
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if (aFlags & eSupportsContainLayoutAndPaint) {
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return false;
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}
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return nsFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG));
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}
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override {
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return MakeFrameName(NS_LITERAL_STRING("SVGView"), aResult);
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}
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#endif
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override {
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// We don't maintain a visual overflow rect
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return false;
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}
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};
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nsIFrame* NS_NewSVGViewFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
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return new (aPresShell) SVGViewFrame(aStyle, aPresShell->GetPresContext());
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}
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NS_IMPL_FRAMEARENA_HELPERS(SVGViewFrame)
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#ifdef DEBUG
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void SVGViewFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) {
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NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::view),
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"Content is not an SVG view");
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nsFrame::Init(aContent, aParent, aPrevInFlow);
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}
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#endif /* DEBUG */
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nsresult SVGViewFrame::AttributeChanged(int32_t aNameSpaceID,
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nsAtom* aAttribute, int32_t aModType) {
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// Ignore zoomAndPan as it does not cause the <svg> element to re-render
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if (aNameSpaceID == kNameSpaceID_None &&
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(aAttribute == nsGkAtoms::preserveAspectRatio ||
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aAttribute == nsGkAtoms::viewBox)) {
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nsSVGOuterSVGFrame* outerSVGFrame = nsSVGUtils::GetOuterSVGFrame(this);
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NS_ASSERTION(outerSVGFrame->GetContent()->IsSVGElement(nsGkAtoms::svg),
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"Expecting an <svg> element");
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SVGSVGElement* svgElement =
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static_cast<SVGSVGElement*>(outerSVGFrame->GetContent());
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nsAutoString viewID;
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mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::id, viewID);
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if (svgElement->IsOverriddenBy(viewID)) {
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// We're the view that's providing overrides, so pretend that the frame
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// we're overriding was updated.
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outerSVGFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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}
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return nsFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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