tor-browser

The Tor Browser
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MediaList.cpp (5357B)

      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/ServoBindings.h"
     13 #include "mozilla/ServoStyleSet.h"
     14 #include "mozilla/StyleSheetInlines.h"
     15 #include "mozilla/dom/Document.h"
     16 #include "mozilla/dom/DocumentInlines.h"
     17 #include "mozilla/dom/MediaListBinding.h"
     18 
     19 namespace mozilla::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  return MakeAndAddRef<MediaList>(
     69      Servo_MediaList_DeepClone(mRawList).Consume());
     70 }
     71 
     72 MediaList::MediaList() : mRawList(Servo_MediaList_Create().Consume()) {}
     73 
     74 MediaList::MediaList(const nsACString& aMedia, CallerType aCallerType)
     75    : MediaList() {
     76  SetTextInternal(aMedia, aCallerType);
     77 }
     78 
     79 void MediaList::GetText(nsACString& aMediaText) const {
     80  Servo_MediaList_GetText(mRawList, &aMediaText);
     81 }
     82 
     83 /* static */
     84 already_AddRefed<MediaList> MediaList::Create(const nsACString& aMedia,
     85                                              CallerType aCallerType) {
     86  return do_AddRef(new MediaList(aMedia, aCallerType));
     87 }
     88 
     89 void MediaList::SetText(const nsACString& aMediaText) {
     90  if (IsReadOnly()) {
     91    return;
     92  }
     93 
     94  SetTextInternal(aMediaText, CallerType::NonSystem);
     95 }
     96 
     97 void MediaList::SetTextInternal(const nsACString& aMediaText,
     98                                CallerType aCallerType) {
     99  Servo_MediaList_SetText(mRawList, &aMediaText, aCallerType);
    100 }
    101 
    102 uint32_t MediaList::Length() const {
    103  return Servo_MediaList_GetLength(mRawList);
    104 }
    105 
    106 bool MediaList::IsViewportDependent() const {
    107  return Servo_MediaList_IsViewportDependent(mRawList);
    108 }
    109 
    110 void MediaList::IndexedGetter(uint32_t aIndex, bool& aFound,
    111                              nsACString& aReturn) const {
    112  aFound = Servo_MediaList_GetMediumAt(mRawList, aIndex, &aReturn);
    113  if (!aFound) {
    114    aReturn.SetIsVoid(true);
    115  }
    116 }
    117 
    118 void MediaList::Delete(const nsACString& aOldMedium, ErrorResult& aRv) {
    119  MOZ_ASSERT(!IsReadOnly());
    120  if (Servo_MediaList_DeleteMedium(mRawList, &aOldMedium)) {
    121    return;
    122  }
    123  aRv.ThrowNotFoundError("Medium not in list");
    124 }
    125 
    126 bool MediaList::Matches(const Document& aDocument) const {
    127  const auto* rawData = aDocument.EnsureStyleSet().RawData();
    128  MOZ_ASSERT(rawData, "The per doc data should be valid!");
    129  return Servo_MediaList_Matches(mRawList, rawData);
    130 }
    131 
    132 void MediaList::Append(const nsACString& aNewMedium, ErrorResult& aRv) {
    133  MOZ_ASSERT(!IsReadOnly());
    134  if (aNewMedium.IsEmpty()) {
    135    // XXXbz per spec there should not be an exception here, as far as
    136    // I can tell...
    137    aRv.ThrowNotFoundError("Empty medium");
    138    return;
    139  }
    140  Servo_MediaList_AppendMedium(mRawList, &aNewMedium);
    141 }
    142 
    143 void MediaList::SetMediaText(const nsACString& aMediaText) {
    144  DoMediaChange([&](ErrorResult& aRv) { SetText(aMediaText); }, IgnoreErrors());
    145 }
    146 
    147 void MediaList::Item(uint32_t aIndex, nsACString& aReturn) {
    148  bool dummy;
    149  IndexedGetter(aIndex, dummy, aReturn);
    150 }
    151 
    152 void MediaList::DeleteMedium(const nsACString& aOldMedium, ErrorResult& aRv) {
    153  DoMediaChange([&](ErrorResult& aRv) { Delete(aOldMedium, aRv); }, aRv);
    154 }
    155 
    156 void MediaList::AppendMedium(const nsACString& aNewMedium, ErrorResult& aRv) {
    157  DoMediaChange([&](ErrorResult& aRv) { Append(aNewMedium, aRv); }, aRv);
    158 }
    159 
    160 MOZ_DEFINE_MALLOC_SIZE_OF(ServoMediaListMallocSizeOf)
    161 MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoMediaListMallocEnclosingSizeOf)
    162 
    163 size_t MediaList::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
    164  size_t n = 0;
    165  n += Servo_MediaList_SizeOfIncludingThis(ServoMediaListMallocSizeOf,
    166                                           ServoMediaListMallocEnclosingSizeOf,
    167                                           mRawList);
    168  return n;
    169 }
    170 
    171 bool MediaList::IsReadOnly() const {
    172  return mStyleSheet && mStyleSheet->IsReadOnly();
    173 }
    174 
    175 }  // namespace mozilla::dom