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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsFrame.h"
#include "nsGkAtoms.h"
#include "nsSVGOuterSVGFrame.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "mozilla/dom/SVGViewElement.h"
using namespace mozilla::dom;
/**
* 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 : public nsFrame
{
friend nsIFrame*
NS_NewSVGViewFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
explicit SVGViewFrame(nsStyleContext* aContext)
: nsFrame(aContext)
{
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS
#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("SVGView"), aResult);
}
#endif
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgFELeafFrame
*/
virtual nsIAtom* GetType() const override;
virtual nsresult AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType) override;
virtual bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override {
// We don't maintain a visual overflow rect
return false;
}
};
nsIFrame*
NS_NewSVGViewFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) SVGViewFrame(aContext);
}
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");
nsFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
SVGViewFrame::GetType() const
{
return nsGkAtoms::svgViewFrame;
}
nsresult
SVGViewFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* 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 ||
aAttribute == nsGkAtoms::viewTarget)) {
nsSVGOuterSVGFrame *outerSVGFrame = nsSVGUtils::GetOuterSVGFrame(this);
NS_ASSERTION(outerSVGFrame->GetContent()->IsSVGElement(nsGkAtoms::svg),
"Expecting an <svg> element");
SVGSVGElement* svgElement =
static_cast<SVGSVGElement*>(outerSVGFrame->GetContent());
nsAutoString viewID;
mContent->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 nsFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
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