air/src/FileProvider.js

   1 /*\r
   2  * Ext JS Library 0.30\r
   3  * Copyright(c) 2006-2009, Ext JS, LLC.\r
   4  * licensing@extjs.com\r
   5  * \r
   6  * http://extjs.com/license\r
   7  */\r
   8 \r
   9 /**\r
  10  * @class Ext.air.FileProvider\r
  11  * @extends Ext.state.Provider\r
  12  * \r
  13  * An Ext state provider implementation for Adobe AIR that stores state in the application \r
  14  * storage directory.\r
  15  * \r
  16  * @constructor\r
  17  * @param {Object} config\r
  18  */\r
  19 Ext.air.FileProvider = function(config){\r
  20     Ext.air.FileProvider.superclass.constructor.call(this);\r
  21         \r
  22         this.defaultState = {\r
  23                 mainWindow : {\r
  24                         width:780,\r
  25                         height:580,\r
  26                         x:10,\r
  27                         y:10\r
  28                 }\r
  29         };\r
  30         \r
  31     Ext.apply(this, config);\r
  32     this.state = this.readState();\r
  33         \r
  34         var provider = this;\r
  35         air.NativeApplication.nativeApplication.addEventListener('exiting', function(){\r
  36                 provider.saveState();\r
  37         });\r
  38 };\r
  39 \r
  40 Ext.extend(Ext.air.FileProvider, Ext.state.Provider, {\r
  41         /**\r
  42          * @cfg {String} file\r
  43          * The file name to use for the state file in the application storage directory\r
  44          */\r
  45         file: 'extstate.data',\r
  46         \r
  47         /**\r
  48          * @cfg {Object} defaultState\r
  49          * The default state if no state file can be found\r
  50          */\r
  51         // private\r
  52     readState : function(){\r
  53                 var stateFile = air.File.applicationStorageDirectory.resolvePath(this.file);\r
  54                 if(!stateFile.exists){\r
  55                         return this.defaultState || {};\r
  56                 }\r
  57                 \r
  58                 var stream = new air.FileStream();\r
  59                 stream.open(stateFile, air.FileMode.READ);\r
  60                 \r
  61                 var stateData = stream.readObject();\r
  62                 stream.close();\r
  63                 \r
  64                 return stateData || this.defaultState || {};\r
  65     },\r
  66 \r
  67     // private\r
  68     saveState : function(name, value){\r
  69         var stateFile = air.File.applicationStorageDirectory.resolvePath(this.file);\r
  70                 var stream = new air.FileStream();\r
  71                 stream.open(stateFile, air.FileMode.WRITE);\r
  72                 stream.writeObject(this.state);\r
  73                 stream.close();\r
  74     }\r
  75 });