1 files changed, 102 insertions, 0 deletions
diff --git a/layout/svg/SVGAFrame.cpp b/layout/svg/SVGAFrame.cpp
new file mode 100644
index 0000000000..cbfdf69e62
--- /dev/null
+++ b/layout/svg/SVGAFrame.cpp
@@ -0,0 +1,102 @@
+/* -*- 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 "gfxMatrix.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/SVGContainerFrame.h"
+#include "mozilla/dom/SVGAElement.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "SVGLengthList.h"
+
+nsIFrame* NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
+                          mozilla::ComputedStyle* aStyle);
+
+namespace mozilla {
+
+class SVGAFrame final : public SVGDisplayContainerFrame {
+  friend nsIFrame* ::NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
+                                     ComputedStyle* aStyle);
+
+ protected:
+  explicit SVGAFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : SVGDisplayContainerFrame(aStyle, aPresContext, kClassID) {}
+
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(SVGAFrame)
+
+#ifdef DEBUG
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+#endif
+
+  // nsIFrame:
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+#ifdef DEBUG_FRAME_DUMP
+  nsresult GetFrameName(nsAString& aResult) const override {
+    return MakeFrameName(u"SVGA"_ns, aResult);
+  }
+#endif
+};
+
+}  // namespace mozilla
+
+//----------------------------------------------------------------------
+// Implementation
+
+nsIFrame* NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
+                          mozilla::ComputedStyle* aStyle) {
+  return new (aPresShell)
+      mozilla::SVGAFrame(aStyle, aPresShell->GetPresContext());
+}
+
+namespace mozilla {
+
+NS_IMPL_FRAMEARENA_HELPERS(SVGAFrame)
+
+//----------------------------------------------------------------------
+// nsIFrame methods
+#ifdef DEBUG
+void SVGAFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
+                     nsIFrame* aPrevInFlow) {
+  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::a),
+               "Trying to construct an SVGAFrame for a "
+               "content element that doesn't support the right interfaces");
+
+  SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
+}
+#endif /* DEBUG */
+
+nsresult SVGAFrame::AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                     int32_t aModType) {
+  if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::transform) {
+    // We don't invalidate for transform changes (the layers code does that).
+    // Also note that SVGTransformableElement::GetAttributeChangeHint will
+    // return nsChangeHint_UpdateOverflow for "transform" attribute changes
+    // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
+    NotifySVGChanged(TRANSFORM_CHANGED);
+  }
+
+  // Currently our SMIL implementation does not modify the DOM attributes. Once
+  // we implement the SVG 2 SMIL behaviour this can be removed
+  // SVGAElement::SetAttr/UnsetAttr's ResetLinkState() call will be sufficient.
+  if (aModType == dom::MutationEvent_Binding::SMIL &&
+      aAttribute == nsGkAtoms::href &&
+      (aNameSpaceID == kNameSpaceID_None ||
+       aNameSpaceID == kNameSpaceID_XLink)) {
+    auto* content = static_cast<dom::SVGAElement*>(GetContent());
+
+    // SMIL may change whether an <a> element is a link, in which case we will
+    // need to update the link state.
+    content->ResetLinkState(true, content->ElementHasHref());
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla