LCOV - code coverage report
Current view: directory - layout/style - nsDOMMediaQueryList.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 81 2 2.5 %
Date: 2012-06-02 Functions: 17 2 11.8 %

       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                 : #include "nsDOMMediaQueryList.h"
      41                 : #include "nsPresContext.h"
      42                 : #include "nsIMediaList.h"
      43                 : #include "nsCSSParser.h"
      44                 : #include "nsDOMClassInfoID.h" // DOMCI_DATA
      45                 : 
      46               0 : nsDOMMediaQueryList::nsDOMMediaQueryList(nsPresContext *aPresContext,
      47                 :                                          const nsAString &aMediaQueryList)
      48                 :   : mPresContext(aPresContext),
      49               0 :     mMediaList(new nsMediaList),
      50               0 :     mMatchesValid(false)
      51                 : {
      52               0 :   PR_INIT_CLIST(this);
      53                 : 
      54               0 :   nsCSSParser parser;
      55               0 :   parser.ParseMediaList(aMediaQueryList, nsnull, 0, mMediaList, false);
      56               0 : }
      57                 : 
      58               0 : nsDOMMediaQueryList::~nsDOMMediaQueryList()
      59                 : {
      60               0 :   if (mPresContext) {
      61               0 :     PR_REMOVE_LINK(this);
      62                 :   }
      63               0 : }
      64                 : 
      65            1464 : NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMMediaQueryList)
      66                 : 
      67               0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMMediaQueryList)
      68               0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mPresContext)
      69               0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSTARRAY_OF_NSCOMPTR(mListeners)
      70               0 : NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
      71                 : 
      72               0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMMediaQueryList)
      73               0 : if (tmp->mPresContext) {
      74               0 :   PR_REMOVE_LINK(tmp);
      75               0 :   NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mPresContext)
      76                 : }
      77               0 : tmp->RemoveAllListeners();
      78               0 : NS_IMPL_CYCLE_COLLECTION_UNLINK_END
      79                 : 
      80                 : DOMCI_DATA(MediaQueryList, nsDOMMediaQueryList)
      81                 : 
      82               0 : NS_INTERFACE_MAP_BEGIN(nsDOMMediaQueryList)
      83               0 :   NS_INTERFACE_MAP_ENTRY(nsIDOMMediaQueryList)
      84               0 :   NS_INTERFACE_MAP_ENTRY(nsISupports)
      85               0 :   NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMMediaQueryList)
      86               0 :   NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(MediaQueryList)
      87               0 : NS_INTERFACE_MAP_END
      88                 : 
      89               0 : NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMMediaQueryList)
      90               0 : NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMMediaQueryList)
      91                 : 
      92                 : NS_IMETHODIMP
      93               0 : nsDOMMediaQueryList::GetMedia(nsAString &aMedia)
      94                 : {
      95               0 :   mMediaList->GetText(aMedia);
      96               0 :   return NS_OK;
      97                 : }
      98                 : 
      99                 : NS_IMETHODIMP
     100               0 : nsDOMMediaQueryList::GetMatches(bool *aMatches)
     101                 : {
     102               0 :   if (!mMatchesValid) {
     103               0 :     NS_ABORT_IF_FALSE(!HasListeners(),
     104                 :                       "when listeners present, must keep mMatches current");
     105               0 :     RecomputeMatches();
     106                 :   }
     107                 : 
     108               0 :   *aMatches = mMatches;
     109               0 :   return NS_OK;
     110                 : }
     111                 : 
     112                 : NS_IMETHODIMP
     113               0 : nsDOMMediaQueryList::AddListener(nsIDOMMediaQueryListListener *aListener)
     114                 : {
     115               0 :   if (!aListener) {
     116               0 :     return NS_OK;
     117                 :   }
     118                 : 
     119               0 :   if (!HasListeners()) {
     120                 :     // When we have listeners, the pres context owns a reference to
     121                 :     // this.  This is a cyclic reference that can only be broken by
     122                 :     // cycle collection.
     123               0 :     NS_ADDREF_THIS();
     124                 :   }
     125                 : 
     126               0 :   if (!mMatchesValid) {
     127               0 :     NS_ABORT_IF_FALSE(!HasListeners(),
     128                 :                       "when listeners present, must keep mMatches current");
     129               0 :     RecomputeMatches();
     130                 :   }
     131                 : 
     132               0 :   if (!mListeners.Contains(aListener)) {
     133               0 :     mListeners.AppendElement(aListener);
     134               0 :     if (!HasListeners()) {
     135                 :       // Append failed; undo the AddRef above.
     136               0 :       NS_RELEASE_THIS();
     137                 :     }
     138                 :   }
     139               0 :   return NS_OK;
     140                 : }
     141                 : 
     142                 : NS_IMETHODIMP
     143               0 : nsDOMMediaQueryList::RemoveListener(nsIDOMMediaQueryListListener *aListener)
     144                 : {
     145               0 :   bool removed = mListeners.RemoveElement(aListener);
     146               0 :   NS_ABORT_IF_FALSE(!mListeners.Contains(aListener),
     147                 :                     "duplicate occurrence of listeners");
     148                 : 
     149               0 :   if (removed && !HasListeners()) {
     150                 :     // See NS_ADDREF_THIS() in AddListener.
     151               0 :     NS_RELEASE_THIS();
     152                 :   }
     153                 : 
     154               0 :   return NS_OK;
     155                 : }
     156                 : 
     157                 : void
     158               0 : nsDOMMediaQueryList::RemoveAllListeners()
     159                 : {
     160               0 :   bool hadListeners = HasListeners();
     161               0 :   mListeners.Clear();
     162               0 :   if (hadListeners) {
     163                 :     // See NS_ADDREF_THIS() in AddListener.
     164               0 :     NS_RELEASE_THIS();
     165                 :   }
     166               0 : }
     167                 : 
     168                 : void
     169               0 : nsDOMMediaQueryList::RecomputeMatches()
     170                 : {
     171               0 :   if (!mPresContext) {
     172               0 :     return;
     173                 :   }
     174                 : 
     175               0 :   mMatches = mMediaList->Matches(mPresContext, nsnull);
     176               0 :   mMatchesValid = true;
     177                 : }
     178                 : 
     179                 : void
     180               0 : nsDOMMediaQueryList::MediumFeaturesChanged(NotifyList &aListenersToNotify)
     181                 : {
     182               0 :   mMatchesValid = false;
     183                 : 
     184               0 :   if (mListeners.Length()) {
     185               0 :     bool oldMatches = mMatches;
     186               0 :     RecomputeMatches();
     187               0 :     if (mMatches != oldMatches) {
     188               0 :       for (PRUint32 i = 0, i_end = mListeners.Length(); i != i_end; ++i) {
     189               0 :         HandleChangeData *d = aListenersToNotify.AppendElement();
     190               0 :         if (d) {
     191               0 :           d->mql = this;
     192               0 :           d->listener = mListeners[i];
     193                 :         }
     194                 :       }
     195                 :     }
     196                 :   }
     197            4392 : }

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