Subversion Repositories eFlore/Applications.cel

/*
 * Ext JS Library 0.20
 * Copyright(c) 2006-2008, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */

tx.Importer = function(){
        function chooseFile(callback){
                var file = new air.File(air.File.documentsDirectory.nativePath);
                var filter = new air.FileFilter("Tasks XML File", "*.xml");
                
                file.addEventListener('select', function(e){
                        doImport(e.target, callback);
                });
                
                file.browseForOpen('Open', [filter]);
        }
        
        
        /*
         * This import function used to be clean and simple. The addition of asynchronous import and
         * a progress bar changed that quickly. :) 
         */
        function doImport(file, callback){
                
                Ext.Msg.progress('Import', 'Reading file...');
                
                var listTable = tx.data.conn.getTable('list', 'listId');
                var taskTable = tx.data.conn.getTable('task', 'taskId');
                var taskCount = 0;
                var visibleIndex = 0;
                var doUpdate = true;
                var f = String.format;
                
                function getProgress(index){
                        if(taskCount > 0){
                                return (.8 * index) / taskCount;
                        }else{
                                return .8;
                        }
                }
                
                function readFile(){
                        var stream = new air.FileStream();
                        stream.open(file, air.FileMode.READ);
                        var xml = stream.readUTFBytes(stream.bytesAvailable);
                        stream.close();
                                        
                        Ext.Msg.updateProgress(.1, 'Parsing...');
                        parse.defer(10, null, [xml]);
                }
                
                function parse(xml){
                        try {
                                var doc = new runtime.flash.xml.XMLDocument();
                                doc.ignoreWhite = true;
                                doc.parseXML(xml);
                                
                                var lists = doc.firstChild.childNodes;
                                var count = lists.length;
                                
                                for (var i = 0; i < count; i++) {
                                        taskCount += lists[i].childNodes.length;
                                }       
                                Ext.Msg.updateProgress(.15, '', 'Loading Tasks...');
                                loadLists(lists, 0);
                        }catch(e){
                                air.trace(e);
                                alert('An error occured while trying to import the selected file.');
                        }                       
                }
                
                function loadLists(lists, index){
                        if(index < lists.length){
                                var list = lists[index];
                                listTable.save(list.attributes);
                                nextTask(list.childNodes, 0, lists, index);
                        }
                        else {
                                Ext.Msg.updateProgress(1, '', 'Completing import...');
                                callback.defer(10);
                        }                               
                }               
                
                function nextTask(tasks, index, lists, listIndex){
                        if(index < tasks.length){
                                Ext.Msg.updateProgress(
                                        getProgress(++visibleIndex),
                                        f('{0} of {1}', visibleIndex, taskCount)
                                );
                                loadTasks.defer(250, window, [tasks, index, lists, listIndex]);
                        }
                        else {
                                loadLists(lists, ++listIndex);
                        }
                }
                
                function loadTasks(tasks, index, lists, listIndex){
                        taskTable.save(tasks[index].attributes);
                        nextTask(tasks, ++index, lists, listIndex);
                }
                
                readFile.defer(10);
        }
        
        this.doImport = function(callback){
                chooseFile(callback);
        }
};