layout/svg/SVGAFrame.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 // Keep in (case-insensitive) order:
   8 #include "gfxMatrix.h"
   9 #include "mozilla/PresShell.h"
  10 #include "mozilla/SVGContainerFrame.h"
  11 #include "mozilla/dom/SVGAElement.h"
  12 #include "mozilla/dom/MutationEventBinding.h"
  13 #include "SVGLengthList.h"
  14
  15 nsIFrame* NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
  16                           mozilla::ComputedStyle* aStyle);
  17
  18 namespace mozilla {
  19
  20 class SVGAFrame final : public SVGDisplayContainerFrame {
  21   friend nsIFrame* ::NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
  22                                      ComputedStyle* aStyle);
  23
  24  protected:
  25   explicit SVGAFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
  26       : SVGDisplayContainerFrame(aStyle, aPresContext, kClassID) {}
  27
  28  public:
  29   NS_DECL_FRAMEARENA_HELPERS(SVGAFrame)
  30
  31 #ifdef DEBUG
  32   void Init(nsIContent* aContent, nsContainerFrame* aParent,
  33             nsIFrame* aPrevInFlow) override;
  34 #endif
  35
  36   // nsIFrame:
  37   nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  38                             int32_t aModType) override;
  39
  40 #ifdef DEBUG_FRAME_DUMP
  41   nsresult GetFrameName(nsAString& aResult) const override {
  42     return MakeFrameName(u"SVGA"_ns, aResult);
  43   }
  44 #endif
  45 };
  46
  47 }  // namespace mozilla
  48
  49 //----------------------------------------------------------------------
  50 // Implementation
  51
  52 nsIFrame* NS_NewSVGAFrame(mozilla::PresShell* aPresShell,
  53                           mozilla::ComputedStyle* aStyle) {
  54   return new (aPresShell)
  55       mozilla::SVGAFrame(aStyle, aPresShell->GetPresContext());
  56 }
  57
  58 namespace mozilla {
  59
  60 NS_IMPL_FRAMEARENA_HELPERS(SVGAFrame)
  61
  62 //----------------------------------------------------------------------
  63 // nsIFrame methods
  64 #ifdef DEBUG
  65 void SVGAFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
  66                      nsIFrame* aPrevInFlow) {
  67   NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::a),
  68                "Trying to construct an SVGAFrame for a "
  69                "content element that doesn't support the right interfaces");
  70
  71   SVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
  72 }
  73 #endif /* DEBUG */
  74
  75 nsresult SVGAFrame::AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
  76                                      int32_t aModType) {
  77   if (aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::transform) {
  78     // We don't invalidate for transform changes (the layers code does that).
  79     // Also note that SVGTransformableElement::GetAttributeChangeHint will
  80     // return nsChangeHint_UpdateOverflow for "transform" attribute changes
  81     // and cause DoApplyRenderingChangeToTree to make the SchedulePaint call.
  82     NotifySVGChanged(TRANSFORM_CHANGED);
  83   }
  84
  85   // Currently our SMIL implementation does not modify the DOM attributes. Once
  86   // we implement the SVG 2 SMIL behaviour this can be removed
  87   // SVGAElement::SetAttr/UnsetAttr's ResetLinkState() call will be sufficient.
  88   if (aModType == dom::MutationEvent_Binding::SMIL &&
  89       aAttribute == nsGkAtoms::href &&
  90       (aNameSpaceID == kNameSpaceID_None ||
  91        aNameSpaceID == kNameSpaceID_XLink)) {
  92     auto* content = static_cast<dom::SVGAElement*>(GetContent());
  93
  94     // SMIL may change whether an <a> element is a link, in which case we will
  95     // need to update the link state.
  96     content->ResetLinkState(true, content->ElementHasHref());
  97   }
  98
  99   return NS_OK;
 100 }
 101
 102 }  // namespace mozilla