LCOV - app.info - layout/style/nsDOMMediaQueryList.h

LCOV - code coverage report
| Current view: | directory - layout/style - nsDOMMediaQueryList.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 4 | 1 | 25.0 %
| Date: | 2012-04-21 | Functions: | 8 | 1 | 12.5 %

           1                 : /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
           2                 : /* ***** BEGIN LICENSE BLOCK *****
           3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           4                 :  *
           5                 :  * The contents of this file are subject to the Mozilla Public License Version
           6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           7                 :  * the License. You may obtain a copy of the License at
           8                 :  * http://www.mozilla.org/MPL/
           9                 :  *
          10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          12                 :  * for the specific language governing rights and limitations under the
          13                 :  * License.
          14                 :  *
          15                 :  * The Original Code is nsDOMMediaQueryList.
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
          18                 :  * Portions created by the Initial Developer are Copyright (C) 2011
          19                 :  * the Initial Developer. All Rights Reserved.
          20                 :  *
          21                 :  * Contributor(s):
          22                 :  *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
          23                 :  *
          24                 :  * Alternatively, the contents of this file may be used under the terms of
          25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          28                 :  * of those above. If you wish to allow use of your version of this file only
          29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          30                 :  * use your version of this file under the terms of the MPL, indicate your
          31                 :  * decision by deleting the provisions above and replace them with the notice
          32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          33                 :  * the provisions above, a recipient may use your version of this file under
          34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          35                 :  *
          36                 :  * ***** END LICENSE BLOCK ***** */
          37                 :
          38                 : /* implements DOM interface for querying and observing media queries */
          39                 :
          40                 : #ifndef nsDOMMediaQueryList_h_
          41                 : #define nsDOMMediaQueryList_h_
          42                 :
          43                 : #include "nsIDOMMediaQueryList.h"
          44                 : #include "nsCycleCollectionParticipant.h"
          45                 : #include "nsAutoPtr.h"
          46                 : #include "nsCOMPtr.h"
          47                 : #include "nsTArray.h"
          48                 : #include "prclist.h"
          49                 :
          50                 : class nsPresContext;
          51                 : class nsMediaList;
          52                 :
          53                 : class nsDOMMediaQueryList : public nsIDOMMediaQueryList,
          54                 :                             public PRCList
          55                 : {
          56                 : public:
          57                 :   // The caller who constructs is responsible for calling Evaluate
          58                 :   // before calling any other methods.
          59                 :   nsDOMMediaQueryList(nsPresContext *aPresContext,
          60                 :                       const nsAString &aMediaQueryList);
          61                 : private:
          62                 :   ~nsDOMMediaQueryList();
          63                 :
          64                 : public:
          65               0 :   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
          66            1396 :   NS_DECL_CYCLE_COLLECTION_CLASS(nsDOMMediaQueryList)
          67                 :
          68                 :   NS_DECL_NSIDOMMEDIAQUERYLIST
          69                 :
          70               0 :   struct HandleChangeData {
          71                 :     nsRefPtr<nsDOMMediaQueryList> mql;
          72                 :     nsCOMPtr<nsIDOMMediaQueryListListener> listener;
          73                 :   };
          74                 :
          75                 :   typedef FallibleTArray< nsCOMPtr<nsIDOMMediaQueryListListener> > ListenerList;
          76                 :   typedef FallibleTArray<HandleChangeData> NotifyList;
          77                 :
          78                 :   // Appends listeners that need notification to aListenersToNotify
          79                 :   void MediumFeaturesChanged(NotifyList &aListenersToNotify);
          80                 :
          81               0 :   bool HasListeners() const { return !mListeners.IsEmpty(); }
          82                 :
          83                 :   void RemoveAllListeners();
          84                 :
          85                 : private:
          86                 :   void RecomputeMatches();
          87                 :
          88                 :   // We only need a pointer to the pres context to support lazy
          89                 :   // reevaluation following dynamic changes.  However, this lazy
          90                 :   // reevaluation is perhaps somewhat important, since some usage
          91                 :   // patterns may involve the creation of large numbers of
          92                 :   // MediaQueryList objects which almost immediately become garbage
          93                 :   // (after a single call to the .matches getter).
          94                 :   //
          95                 :   // This pointer does make us a little more dependent on cycle
          96                 :   // collection.
          97                 :   //
          98                 :   // We have a non-null mPresContext for our entire lifetime except
          99                 :   // after cycle collection unlinking.  Having a non-null mPresContext
         100                 :   // is equivalent to being in that pres context's mDOMMediaQueryLists
         101                 :   // linked list.
         102                 :   nsRefPtr<nsPresContext> mPresContext;
         103                 :
         104                 :   nsRefPtr<nsMediaList> mMediaList;
         105                 :   bool mMatches;
         106                 :   bool mMatchesValid;
         107                 :   ListenerList mListeners;
         108                 : };
         109                 :
         110                 : #endif /* !defined(nsDOMMediaQueryList_h_) */

Generated by: LCOV version 1.7