LCOV - app.info - content/svg/content/src/DOMSVGLengthList.h

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: | 2012-07-07 | 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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