dom/svg/DOMSVGAnimatedNumberList.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 "DOMSVGAnimatedNumberList.h"
   8
   9 #include "DOMSVGNumberList.h"
  10 #include "SVGAnimatedNumberList.h"
  11 #include "SVGAttrTearoffTable.h"
  12 #include "mozilla/dom/SVGAnimatedNumberListBinding.h"
  13 #include "mozilla/dom/SVGElement.h"
  14 #include "mozilla/RefPtr.h"
  15
  16 // See the architecture comment in this file's header.
  17
  18 namespace mozilla::dom {
  19
  20 static inline SVGAttrTearoffTable<SVGAnimatedNumberList,
  21                                   DOMSVGAnimatedNumberList>&
  22 SVGAnimatedNumberListTearoffTable() {
  23   static SVGAttrTearoffTable<SVGAnimatedNumberList, DOMSVGAnimatedNumberList>
  24       sSVGAnimatedNumberListTearoffTable;
  25   return sSVGAnimatedNumberListTearoffTable;
  26 }
  27
  28 NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGAnimatedNumberList,
  29                                                mElement)
  30
  31 JSObject* DOMSVGAnimatedNumberList::WrapObject(
  32     JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  33   return mozilla::dom::SVGAnimatedNumberList_Binding::Wrap(aCx, this,
  34                                                            aGivenProto);
  35 }
  36
  37 already_AddRefed<DOMSVGNumberList> DOMSVGAnimatedNumberList::BaseVal() {
  38   if (!mBaseVal) {
  39     mBaseVal = new DOMSVGNumberList(this, InternalAList().GetBaseValue());
  40   }
  41   RefPtr<DOMSVGNumberList> baseVal = mBaseVal;
  42   return baseVal.forget();
  43 }
  44
  45 already_AddRefed<DOMSVGNumberList> DOMSVGAnimatedNumberList::AnimVal() {
  46   if (!mAnimVal) {
  47     mAnimVal = new DOMSVGNumberList(this, InternalAList().GetAnimValue());
  48   }
  49   RefPtr<DOMSVGNumberList> animVal = mAnimVal;
  50   return animVal.forget();
  51 }
  52
  53 /* static */
  54 already_AddRefed<DOMSVGAnimatedNumberList>
  55 DOMSVGAnimatedNumberList::GetDOMWrapper(SVGAnimatedNumberList* aList,
  56                                         dom::SVGElement* aElement,
  57                                         uint8_t aAttrEnum) {
  58   RefPtr<DOMSVGAnimatedNumberList> wrapper =
  59       SVGAnimatedNumberListTearoffTable().GetTearoff(aList);
  60   if (!wrapper) {
  61     wrapper = new DOMSVGAnimatedNumberList(aElement, aAttrEnum);
  62     SVGAnimatedNumberListTearoffTable().AddTearoff(aList, wrapper);
  63   }
  64   return wrapper.forget();
  65 }
  66
  67 /* static */
  68 DOMSVGAnimatedNumberList* DOMSVGAnimatedNumberList::GetDOMWrapperIfExists(
  69     SVGAnimatedNumberList* aList) {
  70   return SVGAnimatedNumberListTearoffTable().GetTearoff(aList);
  71 }
  72
  73 DOMSVGAnimatedNumberList::~DOMSVGAnimatedNumberList() {
  74   // Script no longer has any references to us, to our base/animVal objects, or
  75   // to any of their list items.
  76   SVGAnimatedNumberListTearoffTable().RemoveTearoff(&InternalAList());
  77 }
  78
  79 void DOMSVGAnimatedNumberList::InternalBaseValListWillChangeTo(
  80     const SVGNumberList& aNewValue) {
  81   // When the number of items in our internal counterpart's baseVal changes,
  82   // we MUST keep our baseVal in sync. If we don't, script will either see a
  83   // list that is too short and be unable to access indexes that should be
  84   // valid, or else, MUCH WORSE, script will see a list that is too long and be
  85   // able to access "items" at indexes that are out of bounds (read/write to
  86   // bad memory)!!
  87
  88   RefPtr<DOMSVGAnimatedNumberList> kungFuDeathGrip;
  89   if (mBaseVal) {
  90     if (aNewValue.Length() < mBaseVal->LengthNoFlush()) {
  91       // InternalListLengthWillChange might clear last reference to |this|.
  92       // Retain a temporary reference to keep from dying before returning.
  93       kungFuDeathGrip = this;
  94     }
  95     mBaseVal->InternalListLengthWillChange(aNewValue.Length());
  96   }
  97
  98   // If our attribute is not animating, then our animVal mirrors our baseVal
  99   // and we must sync its length too. (If our attribute is animating, then the
 100   // SMIL engine takes care of calling InternalAnimValListWillChangeTo() if
 101   // necessary.)
 102
 103   if (!IsAnimating()) {
 104     InternalAnimValListWillChangeTo(aNewValue);
 105   }
 106 }
 107
 108 void DOMSVGAnimatedNumberList::InternalAnimValListWillChangeTo(
 109     const SVGNumberList& aNewValue) {
 110   if (mAnimVal) {
 111     mAnimVal->InternalListLengthWillChange(aNewValue.Length());
 112   }
 113 }
 114
 115 bool DOMSVGAnimatedNumberList::IsAnimating() const {
 116   return InternalAList().IsAnimating();
 117 }
 118
 119 SVGAnimatedNumberList& DOMSVGAnimatedNumberList::InternalAList() {
 120   return *mElement->GetAnimatedNumberList(mAttrEnum);
 121 }
 122
 123 const SVGAnimatedNumberList& DOMSVGAnimatedNumberList::InternalAList() const {
 124   return *mElement->GetAnimatedNumberList(mAttrEnum);
 125 }
 126
 127 }  // namespace mozilla::dom