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/*
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* Ext JS Library 2.0.2
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* Copyright(c) 2006-2008, Ext JS, LLC.
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* licensing@extjs.com
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*
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* http://extjs.com/license
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*/
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/**
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* @class Ext.tree.AsyncTreeNode
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* @extends Ext.tree.TreeNode
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* @cfg {TreeLoader} loader A TreeLoader to be used by this node (defaults to the loader defined on the tree)
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* @constructor
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* @param {Object/String} attributes The attributes/config for the node or just a string with the text for the node
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*/
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Ext.tree.AsyncTreeNode = function(config){
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this.loaded = false;
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this.loading = false;
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Ext.tree.AsyncTreeNode.superclass.constructor.apply(this, arguments);
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/**
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* @event beforeload
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* Fires before this node is loaded, return false to cancel
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* @param {Node} this This node
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*/
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this.addEvents('beforeload', 'load');
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/**
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* @event load
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* Fires when this node is loaded
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* @param {Node} this This node
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*/
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/**
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* The loader used by this node (defaults to using the tree's defined loader)
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* @type TreeLoader
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* @property loader
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*/
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};
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Ext.extend(Ext.tree.AsyncTreeNode, Ext.tree.TreeNode, {
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expand : function(deep, anim, callback){
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if(this.loading){ // if an async load is already running, waiting til it's done
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var timer;
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var f = function(){
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if(!this.loading){ // done loading
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clearInterval(timer);
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this.expand(deep, anim, callback);
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}
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}.createDelegate(this);
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timer = setInterval(f, 200);
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return;
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}
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if(!this.loaded){
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if(this.fireEvent("beforeload", this) === false){
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return;
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}
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this.loading = true;
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this.ui.beforeLoad(this);
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var loader = this.loader || this.attributes.loader || this.getOwnerTree().getLoader();
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if(loader){
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loader.load(this, this.loadComplete.createDelegate(this, [deep, anim, callback]));
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return;
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}
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}
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Ext.tree.AsyncTreeNode.superclass.expand.call(this, deep, anim, callback);
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},
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/**
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* Returns true if this node is currently loading
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* @return {Boolean}
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*/
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isLoading : function(){
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return this.loading;
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},
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loadComplete : function(deep, anim, callback){
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this.loading = false;
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this.loaded = true;
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this.ui.afterLoad(this);
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this.fireEvent("load", this);
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this.expand(deep, anim, callback);
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},
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/**
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* Returns true if this node has been loaded
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* @return {Boolean}
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*/
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isLoaded : function(){
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return this.loaded;
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},
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hasChildNodes : function(){
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if(!this.isLeaf() && !this.loaded){
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return true;
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}else{
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return Ext.tree.AsyncTreeNode.superclass.hasChildNodes.call(this);
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}
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},
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/**
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* Trigger a reload for this node
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* @param {Function} callback
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*/
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reload : function(callback){
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this.collapse(false, false);
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while(this.firstChild){
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this.removeChild(this.firstChild);
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}
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this.childrenRendered = false;
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this.loaded = false;
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if(this.isHiddenRoot()){
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this.expanded = false;
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}
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this.expand(false, false, callback);
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}
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});
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