layout/style/MediaList.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 /* base class for representation of media lists */
   8
   9 #include "mozilla/dom/MediaList.h"
  10
  11 #include "mozAutoDocUpdate.h"
  12 #include "mozilla/dom/Document.h"
  13 #include "mozilla/dom/MediaListBinding.h"
  14 #include "mozilla/ServoBindings.h"
  15 #include "mozilla/ServoStyleSet.h"
  16 #include "mozilla/StyleSheetInlines.h"
  17
  18 namespace mozilla {
  19 namespace dom {
  20
  21 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaList)
  22   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  23   NS_INTERFACE_MAP_ENTRY(nsISupports)
  24 NS_INTERFACE_MAP_END
  25
  26 NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaList)
  27 NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaList)
  28
  29 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(MediaList)
  30
  31 JSObject* MediaList::WrapObject(JSContext* aCx,
  32                                 JS::Handle<JSObject*> aGivenProto) {
  33   return MediaList_Binding::Wrap(aCx, this, aGivenProto);
  34 }
  35
  36 void MediaList::SetStyleSheet(StyleSheet* aSheet) {
  37   MOZ_ASSERT(aSheet == mStyleSheet || !aSheet || !mStyleSheet,
  38              "Multiple style sheets competing for one media list");
  39   mStyleSheet = aSheet;
  40 }
  41
  42 nsISupports* MediaList::GetParentObject() const { return mStyleSheet; }
  43
  44 template <typename Func>
  45 void MediaList::DoMediaChange(Func aCallback, ErrorResult& aRv) {
  46   if (IsReadOnly()) {
  47     return;
  48   }
  49
  50   if (mStyleSheet) {
  51     mStyleSheet->WillDirty();
  52   }
  53
  54   aCallback(aRv);
  55   if (aRv.Failed()) {
  56     return;
  57   }
  58
  59   if (mStyleSheet) {
  60     // FIXME(emilio): We should discern between "owned by a rule" (as in @media)
  61     // and "owned by a sheet" (as in <style media>), and then pass something
  62     // meaningful here.
  63     mStyleSheet->RuleChanged(nullptr, StyleRuleChangeKind::Generic);
  64   }
  65 }
  66
  67 already_AddRefed<MediaList> MediaList::Clone() {
  68   RefPtr<MediaList> clone =
  69       new MediaList(Servo_MediaList_DeepClone(mRawList).Consume());
  70   return clone.forget();
  71 }
  72
  73 MediaList::MediaList() : mRawList(Servo_MediaList_Create().Consume()) {}
  74
  75 MediaList::MediaList(const nsACString& aMedia, CallerType aCallerType)
  76     : MediaList() {
  77   SetTextInternal(aMedia, aCallerType);
  78 }
  79
  80 void MediaList::GetText(nsACString& aMediaText) {
  81   Servo_MediaList_GetText(mRawList, &aMediaText);
  82 }
  83
  84 /* static */
  85 already_AddRefed<MediaList> MediaList::Create(const nsACString& aMedia,
  86                                               CallerType aCallerType) {
  87   RefPtr<MediaList> mediaList = new MediaList(aMedia, aCallerType);
  88   return mediaList.forget();
  89 }
  90
  91 void MediaList::SetText(const nsACString& aMediaText) {
  92   if (IsReadOnly()) {
  93     return;
  94   }
  95
  96   SetTextInternal(aMediaText, CallerType::NonSystem);
  97 }
  98
  99 void MediaList::GetMediaText(nsACString& aMediaText) { GetText(aMediaText); }
 100
 101 void MediaList::SetTextInternal(const nsACString& aMediaText,
 102                                 CallerType aCallerType) {
 103   Servo_MediaList_SetText(mRawList, &aMediaText, aCallerType);
 104 }
 105
 106 uint32_t MediaList::Length() { return Servo_MediaList_GetLength(mRawList); }
 107
 108 void MediaList::IndexedGetter(uint32_t aIndex, bool& aFound,
 109                               nsACString& aReturn) {
 110   aFound = Servo_MediaList_GetMediumAt(mRawList, aIndex, &aReturn);
 111   if (!aFound) {
 112     aReturn.SetIsVoid(true);
 113   }
 114 }
 115
 116 void MediaList::Delete(const nsACString& aOldMedium, ErrorResult& aRv) {
 117   MOZ_ASSERT(!IsReadOnly());
 118   if (Servo_MediaList_DeleteMedium(mRawList, &aOldMedium)) {
 119     return;
 120   }
 121   aRv.ThrowNotFoundError("Medium not in list");
 122 }
 123
 124 bool MediaList::Matches(const Document& aDocument) const {
 125   const RawServoStyleSet* rawSet =
 126       aDocument.StyleSetForPresShellOrMediaQueryEvaluation()->RawSet();
 127   MOZ_ASSERT(rawSet, "The RawServoStyleSet should be valid!");
 128   return Servo_MediaList_Matches(mRawList, rawSet);
 129 }
 130
 131 void MediaList::Append(const nsACString& aNewMedium, ErrorResult& aRv) {
 132   MOZ_ASSERT(!IsReadOnly());
 133   if (aNewMedium.IsEmpty()) {
 134     // XXXbz per spec there should not be an exception here, as far as
 135     // I can tell...
 136     aRv.ThrowNotFoundError("Empty medium");
 137     return;
 138   }
 139   Servo_MediaList_AppendMedium(mRawList, &aNewMedium);
 140 }
 141
 142 void MediaList::SetMediaText(const nsACString& aMediaText) {
 143   DoMediaChange([&](ErrorResult& aRv) { SetText(aMediaText); }, IgnoreErrors());
 144 }
 145
 146 void MediaList::Item(uint32_t aIndex, nsACString& aReturn) {
 147   bool dummy;
 148   IndexedGetter(aIndex, dummy, aReturn);
 149 }
 150
 151 void MediaList::DeleteMedium(const nsACString& aOldMedium, ErrorResult& aRv) {
 152   DoMediaChange([&](ErrorResult& aRv) { Delete(aOldMedium, aRv); }, aRv);
 153 }
 154
 155 void MediaList::AppendMedium(const nsACString& aNewMedium, ErrorResult& aRv) {
 156   DoMediaChange([&](ErrorResult& aRv) { Append(aNewMedium, aRv); }, aRv);
 157 }
 158
 159 MOZ_DEFINE_MALLOC_SIZE_OF(ServoMediaListMallocSizeOf)
 160 MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoMediaListMallocEnclosingSizeOf)
 161
 162 size_t MediaList::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
 163   size_t n = 0;
 164   n += Servo_MediaList_SizeOfIncludingThis(ServoMediaListMallocSizeOf,
 165                                            ServoMediaListMallocEnclosingSizeOf,
 166                                            mRawList);
 167   return n;
 168 }
 169
 170 bool MediaList::IsReadOnly() const {
 171   return mStyleSheet && mStyleSheet->IsReadOnly();
 172 }
 173
 174 }  // namespace dom
 175 }  // namespace mozilla