air/samples/tasks/js/Importer.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 tx.Importer = function(){\r
  10         function chooseFile(callback){\r
  11                 var file = new air.File(air.File.documentsDirectory.nativePath);\r
  12                 var filter = new air.FileFilter("Tasks XML File", "*.xml");\r
  13                 \r
  14                 file.addEventListener('select', function(e){\r
  15                         doImport(e.target, callback);\r
  16                 });\r
  17                 \r
  18                 file.browseForOpen('Open', [filter]);\r
  19         }\r
  20         \r
  21         \r
  22         /*\r
  23          * This import function used to be clean and simple. The addition of asynchronous import and\r
  24          * a progress bar changed that quickly. :) \r
  25          */\r
  26         function doImport(file, callback){\r
  27                 \r
  28                 Ext.Msg.progress('Import', 'Reading file...');\r
  29                 \r
  30                 var listTable = tx.data.conn.getTable('list', 'listId');\r
  31                 var taskTable = tx.data.conn.getTable('task', 'taskId');\r
  32                 var taskCount = 0;\r
  33                 var visibleIndex = 0;\r
  34                 var doUpdate = true;\r
  35                 var f = String.format;\r
  36                 \r
  37                 function getProgress(index){\r
  38                         if(taskCount > 0){\r
  39                                 return (.8 * index) / taskCount;\r
  40                         }else{\r
  41                                 return .8;\r
  42                         }\r
  43                 }\r
  44                 \r
  45                 function readFile(){\r
  46                         var stream = new air.FileStream();\r
  47                         stream.open(file, air.FileMode.READ);\r
  48                         var xml = stream.readUTFBytes(stream.bytesAvailable);\r
  49                         stream.close();\r
  50                                         \r
  51                         Ext.Msg.updateProgress(.1, 'Parsing...');\r
  52                         parse.defer(10, null, [xml]);\r
  53                 }\r
  54                 \r
  55                 function parse(xml){\r
  56                         try {\r
  57                                 var doc = new runtime.flash.xml.XMLDocument();\r
  58                                 doc.ignoreWhite = true;\r
  59                                 doc.parseXML(xml);\r
  60                                 \r
  61                                 var lists = doc.firstChild.childNodes;\r
  62                                 var count = lists.length;\r
  63                                 \r
  64                                 for (var i = 0; i < count; i++) {\r
  65                                         taskCount += lists[i].childNodes.length;\r
  66                                 }       \r
  67                                 Ext.Msg.updateProgress(.15, '', 'Loading Tasks...');\r
  68                                 loadLists(lists, 0);\r
  69                         }catch(e){\r
  70                                 air.trace(e);\r
  71                                 alert('An error occured while trying to import the selected file.');\r
  72                         }                       \r
  73                 }\r
  74                 \r
  75                 function loadLists(lists, index){\r
  76                         if(index < lists.length){\r
  77                                 var list = lists[index];\r
  78                                 listTable.save(list.attributes);\r
  79                                 nextTask(list.childNodes, 0, lists, index);\r
  80                         }\r
  81                         else {\r
  82                                 Ext.Msg.updateProgress(1, '', 'Completing import...');\r
  83                                 callback.defer(10);\r
  84                         }                               \r
  85                 }               \r
  86                 \r
  87                 function nextTask(tasks, index, lists, listIndex){\r
  88                         if(index < tasks.length){\r
  89                                 Ext.Msg.updateProgress(\r
  90                                         getProgress(++visibleIndex),\r
  91                                         f('{0} of {1}', visibleIndex, taskCount)\r
  92                                 );\r
  93                                 loadTasks.defer(250, window, [tasks, index, lists, listIndex]);\r
  94                         }\r
  95                         else {\r
  96                                 loadLists(lists, ++listIndex);\r
  97                         }\r
  98                 }\r
  99                 \r
 100                 function loadTasks(tasks, index, lists, listIndex){\r
 101                         taskTable.save(tasks[index].attributes);\r
 102                         nextTask(tasks, ++index, lists, listIndex);\r
 103                 }\r
 104                 \r
 105                 readFile.defer(10);\r
 106         }\r
 107         \r
 108         this.doImport = function(callback){\r
 109                 chooseFile(callback);\r
 110         }\r
 111 };\r