mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
10d96c7e70
Note: This also fixes a crash (when notifications happen) from calling mql.addListeners(null). This also fixes test_media_query_list.html so that the initial set of tests doesn't keep running through the later tests. The test for the null-dereference has been confirmed to crash without the patch and pass with the patch. The test for the gc issue has been confirmed to fail without the patch and pass with the patch.
111 lines
4.0 KiB
C++
111 lines
4.0 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsDOMMediaQueryList.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* implements DOM interface for querying and observing media queries */
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#ifndef nsDOMMediaQueryList_h_
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#define nsDOMMediaQueryList_h_
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#include "nsIDOMMediaQueryList.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "prclist.h"
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class nsPresContext;
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class nsMediaList;
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class nsDOMMediaQueryList : public nsIDOMMediaQueryList,
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public PRCList
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{
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public:
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// The caller who constructs is responsible for calling Evaluate
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// before calling any other methods.
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nsDOMMediaQueryList(nsPresContext *aPresContext,
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const nsAString &aMediaQueryList);
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private:
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~nsDOMMediaQueryList();
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsDOMMediaQueryList)
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NS_DECL_NSIDOMMEDIAQUERYLIST
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struct HandleChangeData {
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nsRefPtr<nsDOMMediaQueryList> mql;
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nsCOMPtr<nsIDOMMediaQueryListListener> listener;
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};
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typedef FallibleTArray< nsCOMPtr<nsIDOMMediaQueryListListener> > ListenerList;
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typedef FallibleTArray<HandleChangeData> NotifyList;
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// Appends listeners that need notification to aListenersToNotify
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void MediumFeaturesChanged(NotifyList &aListenersToNotify);
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bool HasListeners() const { return !mListeners.IsEmpty(); }
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void RemoveAllListeners();
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private:
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void RecomputeMatches();
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// We only need a pointer to the pres context to support lazy
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// reevaluation following dynamic changes. However, this lazy
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// reevaluation is perhaps somewhat important, since some usage
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// patterns may involve the creation of large numbers of
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// MediaQueryList objects which almost immediately become garbage
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// (after a single call to the .matches getter).
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//
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// This pointer does make us a little more dependent on cycle
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// collection.
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//
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// We have a non-null mPresContext for our entire lifetime except
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// after cycle collection unlinking. Having a non-null mPresContext
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// is equivalent to being in that pres context's mDOMMediaQueryLists
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// linked list.
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nsRefPtr<nsPresContext> mPresContext;
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nsRefPtr<nsMediaList> mMediaList;
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bool mMatches;
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bool mMatchesValid;
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ListenerList mListeners;
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};
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#endif /* !defined(nsDOMMediaQueryList_h_) */
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