LCOV - code coverage report
Current view: directory - content/svg/content/src - DOMSVGAnimatedTransformList.h (source / functions) Found Hit Coverage
Test: app.info Lines: 5 1 20.0 %
Date: 2012-06-02 Functions: 6 1 16.7 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is the Mozilla SVG project.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Crocodile Clips Ltd..
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Alex Fritze <alex.fritze@crocodile-clips.com> (original author)
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #ifndef MOZILLA_DOMSVGANIMATEDTRANSFORMLIST_H__
      41                 : #define MOZILLA_DOMSVGANIMATEDTRANSFORMLIST_H__
      42                 : 
      43                 : #include "nsAutoPtr.h"
      44                 : #include "nsCOMPtr.h"
      45                 : #include "nsCycleCollectionParticipant.h"
      46                 : #include "nsIDOMSVGAnimTransformList.h"
      47                 : #include "nsSVGElement.h"
      48                 : 
      49                 : namespace mozilla {
      50                 : 
      51                 : class DOMSVGTransformList;
      52                 : class SVGAnimatedTransformList;
      53                 : 
      54                 : /**
      55                 :  * Class DOMSVGAnimatedTransformList
      56                 :  *
      57                 :  * This class is used to create the DOM tearoff objects that wrap internal
      58                 :  * SVGAnimatedTransformList objects.
      59                 :  *
      60                 :  * See the architecture comment in DOMSVGAnimatedLengthList.h (that's
      61                 :  * LENGTH list). The comment for that class largly applies to this one too
      62                 :  * and will go a long way to helping you understand the architecture here.
      63                 :  *
      64                 :  * This class is strongly intertwined with DOMSVGTransformList and
      65                 :  * DOMSVGTransform.
      66                 :  * Our DOMSVGTransformList base and anim vals are friends and take care of
      67                 :  * nulling out our pointers to them when they die (making our pointers to them
      68                 :  * true weak refs).
      69                 :  */
      70                 : class DOMSVGAnimatedTransformList : public nsIDOMSVGAnimatedTransformList
      71                 : {
      72                 :   friend class DOMSVGTransformList;
      73                 : 
      74                 : public:
      75               0 :   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
      76            1464 :   NS_DECL_CYCLE_COLLECTION_CLASS(DOMSVGAnimatedTransformList)
      77                 :   NS_DECL_NSIDOMSVGANIMATEDTRANSFORMLIST
      78                 : 
      79                 :   /**
      80                 :    * Factory method to create and return a DOMSVGAnimatedTransformList wrapper
      81                 :    * for a given internal SVGAnimatedTransformList object. The factory takes
      82                 :    * care of caching the object that it returns so that the same object can be
      83                 :    * returned for the given SVGAnimatedTransformList each time it is requested.
      84                 :    * The cached object is only removed from the cache when it is destroyed due
      85                 :    * to there being no more references to it or to any of its descendant
      86                 :    * objects. If that happens, any subsequent call requesting the DOM wrapper
      87                 :    * for the SVGAnimatedTransformList will naturally result in a new
      88                 :    * DOMSVGAnimatedTransformList being returned.
      89                 :    */
      90                 :   static already_AddRefed<DOMSVGAnimatedTransformList>
      91                 :     GetDOMWrapper(SVGAnimatedTransformList *aList, nsSVGElement *aElement);
      92                 : 
      93                 :   /**
      94                 :    * This method returns the DOMSVGAnimatedTransformList wrapper for an internal
      95                 :    * SVGAnimatedTransformList object if it currently has a wrapper. If it does
      96                 :    * not, then nsnull is returned.
      97                 :    */
      98                 :   static DOMSVGAnimatedTransformList*
      99                 :     GetDOMWrapperIfExists(SVGAnimatedTransformList *aList);
     100                 : 
     101                 :   /**
     102                 :    * Called by internal code to notify us when we need to sync the length of
     103                 :    * our baseVal DOM list with its internal list. This is called just prior to
     104                 :    * the length of the internal baseVal list being changed so that any DOM list
     105                 :    * items that need to be removed from the DOM list can first get their values
     106                 :    * from their internal counterpart.
     107                 :    *
     108                 :    * The only time this method could fail is on OOM when trying to increase the
     109                 :    * length of the DOM list. If that happens then this method simply clears the
     110                 :    * list and returns. Callers just proceed as normal, and we simply accept
     111                 :    * that the DOM list will be empty (until successfully set to a new value).
     112                 :    */
     113                 :   void InternalBaseValListWillChangeLengthTo(PRUint32 aNewLength);
     114                 :   void InternalAnimValListWillChangeLengthTo(PRUint32 aNewLength);
     115                 : 
     116                 :   /**
     117                 :    * Returns true if our attribute is animating (in which case our animVal is
     118                 :    * not simply a mirror of our baseVal).
     119                 :    */
     120                 :   bool IsAnimating() const;
     121                 : 
     122                 : private:
     123                 : 
     124                 :   /**
     125                 :    * Only our static GetDOMWrapper() factory method may create objects of our
     126                 :    * type.
     127                 :    */
     128               0 :   DOMSVGAnimatedTransformList(nsSVGElement *aElement)
     129                 :     : mBaseVal(nsnull)
     130                 :     , mAnimVal(nsnull)
     131               0 :     , mElement(aElement)
     132               0 :   {}
     133                 : 
     134                 :   ~DOMSVGAnimatedTransformList();
     135                 : 
     136                 :   /// Get a reference to this DOM wrapper object's internal counterpart.
     137                 :   SVGAnimatedTransformList& InternalAList();
     138                 :   const SVGAnimatedTransformList& InternalAList() const;
     139                 : 
     140                 :   // Weak refs to our DOMSVGTransformList baseVal/animVal objects. These objects
     141                 :   // are friends and take care of clearing these pointers when they die, making
     142                 :   // these true weak references.
     143                 :   DOMSVGTransformList *mBaseVal;
     144                 :   DOMSVGTransformList *mAnimVal;
     145                 : 
     146                 :   // Strong ref to our element to keep it alive. We hold this not only for
     147                 :   // ourself, but also for our base/animVal and all of their items.
     148                 :   nsRefPtr<nsSVGElement> mElement;
     149                 : };
     150                 : 
     151                 : } // namespace mozilla
     152                 : 
     153                 : #endif // MOZILLA_DOMSVGANIMATEDTRANSFORMLIST_H__

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