0.6.x/js/core/04_XCallback.js

   1 \r
   2 var X = X || {};\r
   3 \r
   4 X.Callback = {\r
   5         _LIVE_LIST : [],\r
   6         _POOL_LIST : [],\r
   7         create : function( arg0, arg1, arg2 /* [ listener || ( context + function ) || function ][ args... ] */ ){\r
   8                 var self  = X.Callback,\r
   9                         live  = self._LIVE_LIST,\r
  10                         f, listener, context, callback;\r
  11                 if( typeof arg1 === 'function' ){\r
  12                         context  = arg0;\r
  13                         callback = arg1;\r
  14                 } else\r
  15                 if( typeof arg0 === 'function' ){\r
  16                         callback = arg0;\r
  17                         arg2     = arg1;\r
  18                 } else\r
  19                 if( arg0 && typeof arg0.handleEvent === 'function' ){\r
  20                         listener = arg0;\r
  21                         arg2     = arg1;\r
  22                 } else {\r
  23                         //throw new Error( 'Callback.create() fail!' );\r
  24                 };\r
  25                 \r
  26                 f = self._POOL_LIST.pop();\r
  27                 if( !f ){\r
  28                         f = new Function( 'var a=arguments,f=a.callee;f.a=a;return f.c()' ); // f.t=this;\r
  29                         f.kill = self._kill;\r
  30                         f.same = self._same;                    \r
  31                 };\r
  32                 live[ live.length ] = f;\r
  33                 if( listener ){\r
  34                         f.c        = self._contextCallback;\r
  35                         f.listener = listener;\r
  36                         f.context  = listener;\r
  37                         f.callback = listener.handleEvent;\r
  38                 } else\r
  39                 if( context ){\r
  40                         f.c        = self._contextCallback;\r
  41                         f.context  = context;\r
  42                         f.callback = callback;\r
  43                 } else {\r
  44                         f.c        = self._generalCallback;\r
  45                         f.callback = callback;\r
  46                 };\r
  47 \r
  48                 if( arg2 && typeof arg2.length === 'number' ){\r
  49                         f.add = arg2;\r
  50                 };\r
  51                 return f;\r
  52         },\r
  53         once : function(){\r
  54                 var f = X.Callback.create.apply( null, arguments );\r
  55                 f.once = true;\r
  56                 return f;\r
  57         },\r
  58         find : function( arg0, arg1 /* [ listener || ( context + function ) || function ] */ ){\r
  59                 var live     = X.Callback._LIVE_LIST,\r
  60                         i        = live.length,\r
  61                         listener, context, callback,\r
  62                         f;\r
  63                 if( typeof arg1 === 'function' ){\r
  64                         context  = arg0;\r
  65                         callback = arg1;\r
  66                 } else\r
  67                 if( typeof arg0 === 'function' ){\r
  68                         callback = arg0;\r
  69                 } else\r
  70                 if( arg0 && typeof arg0.handleEvent === 'function' ){\r
  71                         listener = arg0;\r
  72                 };\r
  73                 \r
  74                 for( ; i; ){\r
  75                         f = live[ --i ];\r
  76                         if( listener && f.listener === listener ){\r
  77                                 return f;\r
  78                         } else\r
  79                         if( context && f.context === context && f.callback === callback ){\r
  80                                 return f;\r
  81                         } else          \r
  82                         if( f.callback === callback ){\r
  83                                 return f;\r
  84                         };\r
  85                 };\r
  86                 return null;\r
  87         },\r
  88         _contextCallback : function(){\r
  89                 var f = this,\r
  90                         a = f.a,\r
  91                         s = f.add,\r
  92                         c = f.callback,\r
  93                         x = f.context,\r
  94                         i = 0, l, r;\r
  95                 s && s.push.apply( a, s );\r
  96                 l = a.length;\r
  97                 r = l === 0 ? c.call( x ) :\r
  98                     l === 1 ? c.call( x, a[ 0 ] ) : c.apply( x, a );\r
  99                 delete f.a;\r
 100                 //delete f.t;\r
 101                 f.once && X.Callback._correct( f );\r
 102                 return r;\r
 103         },\r
 104         _generalCallback : function(){\r
 105                 var f = this,\r
 106                         a = f.a,\r
 107                         s = f.add,\r
 108                         c = f.callback,\r
 109                         i = 0, l, r;\r
 110                 s && s.push.apply( a, s );\r
 111                 l = a.length;\r
 112                 r = l === 0 ? c() :\r
 113                         l === 1 ? c( a[ 0 ] ) : c.apply( null, a );\r
 114                 delete f.a;\r
 115                 //delete f.t;\r
 116                 f.once && X.Callback._correct( f );\r
 117                 return r;\r
 118         },\r
 119         _kill : function(){\r
 120                 X.Callback._correct( this );\r
 121         },\r
 122         _same : function( arg0, arg1, arg2 ){\r
 123                 var listener, context, callback,\r
 124                         f = this;\r
 125                 if( typeof arg1 === 'function' ){\r
 126                         context  = arg0;\r
 127                         callback = arg1;\r
 128                 } else\r
 129                 if( typeof arg0 === 'function' ){\r
 130                         callback = arg0;\r
 131                         arg2     = arg1;\r
 132                 } else\r
 133                 if( arg0 && typeof arg0.handleEvent === 'function' ){\r
 134                         listener = arg0;\r
 135                         arg2     = arg1;\r
 136                 };\r
 137                 \r
 138                 if( arg2 && f.add && f.add !== arg2 ){\r
 139                         return false;\r
 140                 };\r
 141                 \r
 142                 if( listener && f.listener === listener ){\r
 143                         return true;\r
 144                 } else\r
 145                 if( context && f.context === context && f.callback === callback ){\r
 146                         return true;\r
 147                 } else          \r
 148                 if( f.callback === callback ){\r
 149                         return true;\r
 150                 };\r
 151                 return false;\r
 152         },\r
 153         _correct : function( f ){\r
 154                 var self = X.Callback,\r
 155                         i    = self._LIVE_LIST.indexOf( f );\r
 156                 if( f.c ) delete f.c;\r
 157                 if( f.listener ) delete f.listener;\r
 158                 if( f.context  ) delete f.context;\r
 159                 if( f.callback ) delete f.callback;\r
 160                 if( f.once     ) delete f.once;\r
 161                 if( f.add      ) delete f.add;\r
 162                 if( i === -1 ) return;\r
 163                 self._LIVE_LIST.splice( i, 1 );\r
 164                 self._POOL_LIST.push( f );\r
 165         },\r
 166         sys_monitor : function(){\r
 167                 return {\r
 168                         'Live callback' : X.Callback._LIVE_LIST.length,\r
 169                         'Pool callback' : X.Callback._POOL_LIST.length\r
 170                 };\r
 171         },\r
 172         sys_gc : function(){\r
 173                 var self = X.Callback,\r
 174                         list = self._POOL_LIST, f;\r
 175                 while( 0 < list.length ){\r
 176                         f = list.shift();\r
 177                         self._correct( f );\r
 178                         delete f.kill;\r
 179                         delete f.same;\r
 180                 };\r
 181         }\r
 182 };\r