flymis/WebRoot/dojojs/src/widget/TreeCommon.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/


dojo.provide("dojo.widget.TreeCommon");
dojo.require("dojo.widget.*"); // for dojo.widget.manager

dojo.declare(
	"dojo.widget.TreeCommon",
	null,
{
	listenTreeEvents: [],
	listenedTrees: {},
	
	/**
	 * evaluates to false => skip unlistening nodes
	 * provided => use it
	 */	
	listenNodeFilter: null,
	
	listenTree: function(tree) {
		
		//dojo.debug("listenTree in "+this+" tree "+tree);
		
		var _this = this;
		
		if (this.listenedTrees[tree.widgetId]) {
			return; // already listening
		}
		
		dojo.lang.forEach(this.listenTreeEvents, function(event) {
			var eventHandler =  "on" + event.charAt(0).toUpperCase() + event.substr(1);
			//dojo.debug("subscribe: event "+tree.eventNames[event]+" widget "+_this+" handler "+eventHandler);
			dojo.event.topic.subscribe(tree.eventNames[event], _this, eventHandler);
		});
		
		
		var filter;
		
		if (this.listenNodeFilter) {			
			this.processDescendants(tree, this.listenNodeFilter, this.listenNode, true);
		}
		
		/**
		 * remember that I listen to this tree. No unbinding/binding/deselection
		 * needed when transfer between listened trees
		 */
		this.listenedTrees[tree.widgetId] = true;
		
	},			
	
	// interface functions
	listenNode: function() {},
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