LCOV - code coverage report
Current view: directory - content/svg/content/src - DOMSVGLengthList.h (source / functions) Found Hit Coverage
Test: app.info Lines: 25 1 4.0 %
Date: 2012-06-02 Functions: 13 1 7.7 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       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 Mozilla SVG Project code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *
      23                 :  * Alternatively, the contents of this file may be used under the terms of
      24                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      25                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      26                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      27                 :  * of those above. If you wish to allow use of your version of this file only
      28                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      29                 :  * use your version of this file under the terms of the MPL, indicate your
      30                 :  * decision by deleting the provisions above and replace them with the notice
      31                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      32                 :  * the provisions above, a recipient may use your version of this file under
      33                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      34                 :  *
      35                 :  * ***** END LICENSE BLOCK ***** */
      36                 : 
      37                 : #ifndef MOZILLA_DOMSVGLENGTHLIST_H__
      38                 : #define MOZILLA_DOMSVGLENGTHLIST_H__
      39                 : 
      40                 : #include "DOMSVGAnimatedLengthList.h"
      41                 : #include "nsAutoPtr.h"
      42                 : #include "nsCycleCollectionParticipant.h"
      43                 : #include "nsDebug.h"
      44                 : #include "nsIDOMSVGLengthList.h"
      45                 : #include "nsTArray.h"
      46                 : #include "SVGLengthList.h"
      47                 : 
      48                 : class nsIDOMSVGLength;
      49                 : class nsSVGElement;
      50                 : 
      51                 : namespace mozilla {
      52                 : 
      53                 : class DOMSVGLength;
      54                 : 
      55                 : /**
      56                 :  * Class DOMSVGLengthList
      57                 :  *
      58                 :  * This class is used to create the DOM tearoff objects that wrap internal
      59                 :  * SVGLengthList objects.
      60                 :  *
      61                 :  * See the architecture comment in DOMSVGAnimatedLengthList.h.
      62                 :  *
      63                 :  * This class is strongly intertwined with DOMSVGAnimatedLengthList and
      64                 :  * DOMSVGLength. We are a friend of DOMSVGAnimatedLengthList, and are
      65                 :  * responsible for nulling out our DOMSVGAnimatedLengthList's pointer to us
      66                 :  * when we die, essentially making its pointer to us a weak pointer. Similarly,
      67                 :  * our DOMSVGLength items are friends of us and responsible for nulling out our
      68                 :  * pointers to them.
      69                 :  *
      70                 :  * Our DOM items are created lazily on demand as and when script requests them.
      71                 :  */
      72                 : class DOMSVGLengthList : public nsIDOMSVGLengthList,
      73                 :                          public nsWrapperCache
      74                 : {
      75                 :   friend class DOMSVGLength;
      76                 : 
      77                 : public:
      78               0 :   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
      79            1464 :   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMSVGLengthList)
      80                 :   NS_DECL_NSIDOMSVGLENGTHLIST
      81                 : 
      82               0 :   DOMSVGLengthList(DOMSVGAnimatedLengthList *aAList,
      83                 :                    const SVGLengthList &aInternalList)
      84               0 :     : mAList(aAList)
      85                 :   {
      86               0 :     SetIsProxy();
      87                 : 
      88                 :     // aInternalList must be passed in explicitly because we can't use
      89                 :     // InternalList() here. (Because it depends on IsAnimValList, which depends
      90                 :     // on this object having been assigned to aAList's mBaseVal or mAnimVal,
      91                 :     // which hasn't happend yet.)
      92                 :     
      93               0 :     InternalListLengthWillChange(aInternalList.Length()); // Sync mItems
      94               0 :   }
      95                 : 
      96               0 :   ~DOMSVGLengthList() {
      97                 :     // Our mAList's weak ref to us must be nulled out when we die. If GC has
      98                 :     // unlinked us using the cycle collector code, then that has already
      99                 :     // happened, and mAList is null.
     100               0 :     if (mAList) {
     101               0 :       ( IsAnimValList() ? mAList->mAnimVal : mAList->mBaseVal ) = nsnull;
     102                 :     }
     103               0 :   };
     104                 : 
     105                 :   virtual JSObject* WrapObject(JSContext *cx, XPCWrappedNativeScope *scope,
     106                 :                                bool *triedToWrap);
     107                 : 
     108               0 :   nsISupports* GetParentObject()
     109                 :   {
     110               0 :     return static_cast<nsIContent*>(Element());
     111                 :   }
     112                 : 
     113                 :   /**
     114                 :    * This will normally be the same as InternalList().Length(), except if we've
     115                 :    * hit OOM in which case our length will be zero.
     116                 :    */
     117               0 :   PRUint32 Length() const {
     118               0 :     NS_ABORT_IF_FALSE(mItems.Length() == 0 ||
     119                 :                       mItems.Length() == InternalList().Length(),
     120                 :                       "DOM wrapper's list length is out of sync");
     121               0 :     return mItems.Length();
     122                 :   }
     123                 : 
     124                 :   /// Called to notify us to syncronize our length and detach excess items.
     125                 :   void InternalListLengthWillChange(PRUint32 aNewLength);
     126                 : 
     127                 : private:
     128                 : 
     129               0 :   nsSVGElement* Element() const {
     130               0 :     return mAList->mElement;
     131                 :   }
     132                 : 
     133               0 :   PRUint8 AttrEnum() const {
     134               0 :     return mAList->mAttrEnum;
     135                 :   }
     136                 : 
     137               0 :   PRUint8 Axis() const {
     138               0 :     return mAList->mAxis;
     139                 :   }
     140                 : 
     141                 :   /// Used to determine if this list is the baseVal or animVal list.
     142               0 :   bool IsAnimValList() const {
     143               0 :     NS_ABORT_IF_FALSE(this == mAList->mBaseVal || this == mAList->mAnimVal,
     144                 :                       "Calling IsAnimValList() too early?!");
     145               0 :     return this == mAList->mAnimVal;
     146                 :   }
     147                 : 
     148                 :   /**
     149                 :    * Get a reference to this object's corresponding internal SVGLengthList.
     150                 :    *
     151                 :    * To simplify the code we just have this one method for obtaining both
     152                 :    * baseVal and animVal internal lists. This means that animVal lists don't
     153                 :    * get const protection, but our setter methods guard against changing
     154                 :    * animVal lists.
     155                 :    */
     156                 :   SVGLengthList& InternalList() const;
     157                 : 
     158                 :   /// Creates a DOMSVGLength for aIndex, if it doesn't already exist.
     159                 :   void EnsureItemAt(PRUint32 aIndex);
     160                 : 
     161                 :   void MaybeInsertNullInAnimValListAt(PRUint32 aIndex);
     162                 :   void MaybeRemoveItemFromAnimValListAt(PRUint32 aIndex);
     163                 : 
     164                 :   // Weak refs to our DOMSVGLength items. The items are friends and take care
     165                 :   // of clearing our pointer to them when they die.
     166                 :   nsTArray<DOMSVGLength*> mItems;
     167                 : 
     168                 :   nsRefPtr<DOMSVGAnimatedLengthList> mAList;
     169                 : };
     170                 : 
     171                 : } // namespace mozilla
     172                 : 
     173                 : #endif // MOZILLA_DOMSVGLENGTHLIST_H__

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