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-rw-r--r--layout/svg/SVGViewFrame.cpp127
1 files changed, 127 insertions, 0 deletions
diff --git a/layout/svg/SVGViewFrame.cpp b/layout/svg/SVGViewFrame.cpp
new file mode 100644
index 000000000..7ffa4824f
--- /dev/null
+++ b/layout/svg/SVGViewFrame.cpp
@@ -0,0 +1,127 @@
+/* -*- 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);
+}