diff options
Diffstat (limited to 'layout/svg/SVGViewFrame.cpp')
-rw-r--r-- | layout/svg/SVGViewFrame.cpp | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/layout/svg/SVGViewFrame.cpp b/layout/svg/SVGViewFrame.cpp new file mode 100644 index 0000000000..d0315b29c5 --- /dev/null +++ b/layout/svg/SVGViewFrame.cpp @@ -0,0 +1,119 @@ +/* -*- 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 "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); + + protected: + explicit SVGViewFrame(ComputedStyle* aStyle, nsPresContext* aPresContext) + : nsIFrame(aStyle, aPresContext, kClassID) { + AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY); + } + + public: + NS_DECL_FRAMEARENA_HELPERS(SVGViewFrame) + +#ifdef DEBUG + virtual void Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; +#endif + + virtual bool IsFrameOfType(uint32_t aFlags) const override { + if (aFlags & eSupportsContainLayoutAndPaint) { + return false; + } + + return nsIFrame::IsFrameOfType(aFlags & ~(nsIFrame::eSVG)); + } + +#ifdef DEBUG_FRAME_DUMP + virtual nsresult GetFrameName(nsAString& aResult) const override { + return MakeFrameName(u"SVGView"_ns, aResult); + } +#endif + + virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, + int32_t aModType) override; + + virtual 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 { + +NS_IMPL_FRAMEARENA_HELPERS(SVGViewFrame) + +#ifdef DEBUG +void SVGViewFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::view), + "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); + NS_ASSERTION(outerSVGFrame->GetContent()->IsSVGElement(nsGkAtoms::svg), + "Expecting an <svg> element"); + + SVGSVGElement* svgElement = + static_cast<SVGSVGElement*>(outerSVGFrame->GetContent()); + + nsAutoString viewID; + mContent->AsElement()->GetAttr(kNameSpaceID_None, 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 |