The Tor Browser / file comparison
comparison: layout/style/MediaQueryList.cpp
layout/style/MediaQueryList.cpp
- changeset 2
- 7e26c7da4463
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| -1:000000000000 | 0:59596740682f |
|---|---|
| 1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* implements DOM interface for querying and observing media queries */ | |
| 7 | |
| 8 #include "mozilla/dom/MediaQueryList.h" | |
| 9 #include "nsPresContext.h" | |
| 10 #include "nsIMediaList.h" | |
| 11 #include "nsCSSParser.h" | |
| 12 #include "nsIDocument.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 namespace dom { | |
| 16 | |
| 17 MediaQueryList::MediaQueryList(nsPresContext *aPresContext, | |
| 18 const nsAString &aMediaQueryList) | |
| 19 : mPresContext(aPresContext), | |
| 20 mMediaList(new nsMediaList), | |
| 21 mMatchesValid(false) | |
| 22 { | |
| 23 PR_INIT_CLIST(this); | |
| 24 | |
| 25 SetIsDOMBinding(); | |
| 26 | |
| 27 nsCSSParser parser; | |
| 28 parser.ParseMediaList(aMediaQueryList, nullptr, 0, mMediaList, false); | |
| 29 } | |
| 30 | |
| 31 MediaQueryList::~MediaQueryList() | |
| 32 { | |
| 33 if (mPresContext) { | |
| 34 PR_REMOVE_LINK(this); | |
| 35 } | |
| 36 } | |
| 37 | |
| 38 NS_IMPL_CYCLE_COLLECTION_CLASS(MediaQueryList) | |
| 39 | |
| 40 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(MediaQueryList) | |
| 41 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPresContext) | |
| 42 NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallbacks) | |
| 43 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS | |
| 44 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END | |
| 45 | |
| 46 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(MediaQueryList) | |
| 47 if (tmp->mPresContext) { | |
| 48 PR_REMOVE_LINK(tmp); | |
| 49 NS_IMPL_CYCLE_COLLECTION_UNLINK(mPresContext) | |
| 50 } | |
| 51 tmp->RemoveAllListeners(); | |
| 52 NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER | |
| 53 NS_IMPL_CYCLE_COLLECTION_UNLINK_END | |
| 54 | |
| 55 NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(MediaQueryList) | |
| 56 | |
| 57 NS_INTERFACE_MAP_BEGIN(MediaQueryList) | |
| 58 NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY | |
| 59 NS_INTERFACE_MAP_ENTRY(nsISupports) | |
| 60 NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(MediaQueryList) | |
| 61 NS_INTERFACE_MAP_END | |
| 62 | |
| 63 NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaQueryList) | |
| 64 NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaQueryList) | |
| 65 | |
| 66 void | |
| 67 MediaQueryList::GetMedia(nsAString &aMedia) | |
| 68 { | |
| 69 mMediaList->GetText(aMedia); | |
| 70 } | |
| 71 | |
| 72 bool | |
| 73 MediaQueryList::Matches() | |
| 74 { | |
| 75 if (!mMatchesValid) { | |
| 76 NS_ABORT_IF_FALSE(!HasListeners(), | |
| 77 "when listeners present, must keep mMatches current"); | |
| 78 RecomputeMatches(); | |
| 79 } | |
| 80 | |
| 81 return mMatches; | |
| 82 } | |
| 83 | |
| 84 void | |
| 85 MediaQueryList::AddListener(MediaQueryListListener& aListener) | |
| 86 { | |
| 87 if (!HasListeners()) { | |
| 88 // When we have listeners, the pres context owns a reference to | |
| 89 // this. This is a cyclic reference that can only be broken by | |
| 90 // cycle collection. | |
| 91 NS_ADDREF_THIS(); | |
| 92 } | |
| 93 | |
| 94 if (!mMatchesValid) { | |
| 95 NS_ABORT_IF_FALSE(!HasListeners(), | |
| 96 "when listeners present, must keep mMatches current"); | |
| 97 RecomputeMatches(); | |
| 98 } | |
| 99 | |
| 100 for (uint32_t i = 0; i < mCallbacks.Length(); ++i) { | |
| 101 if (aListener == *mCallbacks[i]) { | |
| 102 // Already registered | |
| 103 return; | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 mCallbacks.AppendElement(&aListener); | |
| 108 if (!HasListeners()) { | |
| 109 // Append failed; undo the AddRef above. | |
| 110 NS_RELEASE_THIS(); | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 void | |
| 115 MediaQueryList::RemoveListener(MediaQueryListListener& aListener) | |
| 116 { | |
| 117 for (uint32_t i = 0; i < mCallbacks.Length(); ++i) { | |
| 118 if (aListener == *mCallbacks[i]) { | |
| 119 mCallbacks.RemoveElementAt(i); | |
| 120 if (!HasListeners()) { | |
| 121 // See NS_ADDREF_THIS() in AddListener. | |
| 122 NS_RELEASE_THIS(); | |
| 123 } | |
| 124 break; | |
| 125 } | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 void | |
| 130 MediaQueryList::RemoveAllListeners() | |
| 131 { | |
| 132 bool hadListeners = HasListeners(); | |
| 133 mCallbacks.Clear(); | |
| 134 if (hadListeners) { | |
| 135 // See NS_ADDREF_THIS() in AddListener. | |
| 136 NS_RELEASE_THIS(); | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 void | |
| 141 MediaQueryList::RecomputeMatches() | |
| 142 { | |
| 143 if (!mPresContext) { | |
| 144 return; | |
| 145 } | |
| 146 | |
| 147 mMatches = mMediaList->Matches(mPresContext, nullptr); | |
| 148 mMatchesValid = true; | |
| 149 } | |
| 150 | |
| 151 void | |
| 152 MediaQueryList::MediumFeaturesChanged(NotifyList &aListenersToNotify) | |
| 153 { | |
| 154 mMatchesValid = false; | |
| 155 | |
| 156 if (HasListeners()) { | |
| 157 bool oldMatches = mMatches; | |
| 158 RecomputeMatches(); | |
| 159 if (mMatches != oldMatches) { | |
| 160 for (uint32_t i = 0, i_end = mCallbacks.Length(); i != i_end; ++i) { | |
| 161 HandleChangeData *d = aListenersToNotify.AppendElement(); | |
| 162 if (d) { | |
| 163 d->mql = this; | |
| 164 d->callback = mCallbacks[i]; | |
| 165 } | |
| 166 } | |
| 167 } | |
| 168 } | |
| 169 } | |
| 170 | |
| 171 nsISupports* | |
| 172 MediaQueryList::GetParentObject() const | |
| 173 { | |
| 174 if (!mPresContext) { | |
| 175 return nullptr; | |
| 176 } | |
| 177 return mPresContext->Document(); | |
| 178 } | |
| 179 | |
| 180 JSObject* | |
| 181 MediaQueryList::WrapObject(JSContext* aCx) | |
| 182 { | |
| 183 return MediaQueryListBinding::Wrap(aCx, this); | |
| 184 } | |
| 185 | |
| 186 } // namespace dom | |
| 187 } // namespace mozilla |
