dom/svg/SVGTransformableElement.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 #include "SVGTransformableElement.h"
   8
   9 #include "DOMSVGAnimatedTransformList.h"
  10 #include "mozilla/dom/MutationEventBinding.h"
  11 #include "nsContentUtils.h"
  12 #include "nsIFrame.h"
  13
  14 using namespace mozilla::gfx;
  15
  16 namespace mozilla::dom {
  17
  18 already_AddRefed<DOMSVGAnimatedTransformList>
  19 SVGTransformableElement::Transform() {
  20   // We're creating a DOM wrapper, so we must tell GetAnimatedTransformList
  21   // to allocate the DOMSVGAnimatedTransformList if it hasn't already done so:
  22   return DOMSVGAnimatedTransformList::GetDOMWrapper(
  23       GetAnimatedTransformList(DO_ALLOCATE), this);
  24 }
  25
  26 //----------------------------------------------------------------------
  27 // nsIContent methods
  28
  29 bool SVGTransformableElement::IsAttributeMapped(
  30     const nsAtom* aAttribute) const {
  31   return aAttribute == nsGkAtoms::transform ||
  32          SVGElement::IsAttributeMapped(aAttribute);
  33 }
  34
  35 bool SVGTransformableElement::IsEventAttributeNameInternal(nsAtom* aName) {
  36   return nsContentUtils::IsEventAttributeName(aName, EventNameType_SVGGraphic);
  37 }
  38
  39 //----------------------------------------------------------------------
  40 // SVGElement overrides
  41
  42 const gfx::Matrix* SVGTransformableElement::GetAnimateMotionTransform() const {
  43   return mAnimateMotionTransform.get();
  44 }
  45
  46 void SVGTransformableElement::SetAnimateMotionTransform(
  47     const gfx::Matrix* aMatrix) {
  48   if ((!aMatrix && !mAnimateMotionTransform) ||
  49       (aMatrix && mAnimateMotionTransform &&
  50        aMatrix->FuzzyEquals(*mAnimateMotionTransform))) {
  51     return;
  52   }
  53   bool transformSet = mTransforms && mTransforms->IsExplicitlySet();
  54   bool prevSet = mAnimateMotionTransform || transformSet;
  55   mAnimateMotionTransform =
  56       aMatrix ? MakeUnique<gfx::Matrix>(*aMatrix) : nullptr;
  57   bool nowSet = mAnimateMotionTransform || transformSet;
  58   int32_t modType;
  59   if (prevSet && !nowSet) {
  60     modType = MutationEvent_Binding::REMOVAL;
  61   } else if (!prevSet && nowSet) {
  62     modType = MutationEvent_Binding::ADDITION;
  63   } else {
  64     modType = MutationEvent_Binding::MODIFICATION;
  65   }
  66   DidAnimateTransformList(modType);
  67   nsIFrame* frame = GetPrimaryFrame();
  68   if (frame) {
  69     // If the result of this transform and any other transforms on this frame
  70     // is the identity matrix, then DoApplyRenderingChangeToTree won't handle
  71     // our nsChangeHint_UpdateTransformLayer hint since aFrame->IsTransformed()
  72     // will return false. That's fine, but we still need to schedule a repaint,
  73     // and that won't otherwise happen. Since it's cheap to call SchedulePaint,
  74     // we don't bother to check IsTransformed().
  75     frame->SchedulePaint();
  76   }
  77 }
  78
  79 SVGAnimatedTransformList* SVGTransformableElement::GetAnimatedTransformList(
  80     uint32_t aFlags) {
  81   if (!mTransforms && (aFlags & DO_ALLOCATE)) {
  82     mTransforms = MakeUnique<SVGAnimatedTransformList>();
  83   }
  84   return mTransforms.get();
  85 }
  86
  87 }  // namespace mozilla::dom