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/* -*- 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 */
// Keep in (case-insensitive) order:
#include "mozilla/PresShell.h"
#include "mozilla/SVGOuterSVGFrame.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "mozilla/dom/SVGViewElement.h"
#include "nsIFrame.h"
#include "nsGkAtoms.h"
using namespace mozilla::dom;
nsIFrame* NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle);
namespace mozilla {
* While views are not directly rendered in SVG they can be linked to
* and thereby override attributes of an <svg> element via a fragment
* identifier. The SVGViewFrame class passes on any attribute changes
* the view receives to the overridden <svg> element (if there is one).
class SVGViewFrame final : public nsIFrame {
friend nsIFrame* ::NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle);
explicit SVGViewFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsIFrame(aStyle, aPresContext, kClassID) {
#ifdef DEBUG
void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(u"SVGView"_ns, aResult);
nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) override;
bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
// We don't maintain a ink overflow rect
return false;
} // namespace mozilla
nsIFrame* NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
mozilla::ComputedStyle* aStyle) {
return new (aPresShell)
mozilla::SVGViewFrame(aStyle, aPresShell->GetPresContext());
namespace mozilla {
#ifdef DEBUG
void SVGViewFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
"Content is not an SVG view");
nsIFrame::Init(aContent, aParent, aPrevInFlow);
#endif /* DEBUG */
nsresult SVGViewFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType) {
// Ignore zoomAndPan as it does not cause the <svg> element to re-render
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::preserveAspectRatio ||
aAttribute == nsGkAtoms::viewBox)) {
SVGOuterSVGFrame* outerSVGFrame = SVGUtils::GetOuterSVGFrame(this);
"Expecting an <svg> element");
SVGSVGElement* svgElement =
nsAutoString viewID;
mContent->AsElement()->GetAttr(nsGkAtoms::id, viewID);
if (svgElement->IsOverriddenBy(viewID)) {
// We're the view that's providing overrides, so pretend that the frame
// we're overriding was updated.
outerSVGFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
} // namespace mozilla