treecommon.js

初学者

/*
	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.*");
dojo.declare("dojo.widget.TreeCommon", null, {listenTreeEvents:[], listenedTrees:{}, listenNodeFilter:null, listenTree:function (tree) {
	var _this = this;
	if (this.listenedTrees[tree.widgetId]) {
		return;
	}
	dojo.lang.forEach(this.listenTreeEvents, function (event) {
		var eventHandler = "on" + event.charAt(0).toUpperCase() + event.substr(1);
		dojo.event.topic.subscribe(tree.eventNames[event], _this, eventHandler);
	});
	var filter;
	if (this.listenNodeFilter) {
		this.processDescendants(tree, this.listenNodeFilter, this.listenNode, true);
	}
	this.listenedTrees[tree.widgetId] = true;
}, listenNode:function () {
}, unlistenNode:function () {
}, unlistenTree:function (tree, nodeFilter) {
	var _this = this;
	if (!this.listenedTrees[tree.widgetId]) {
		return;
	}
	dojo.lang.forEach(this.listenTreeEvents, function (event) {
		var eventHandler = "on" + event.charAt(0).toUpperCase() + event.substr(1);
		dojo.event.topic.unsubscribe(tree.eventNames[event], _this, eventHandler);
	});
	if (this.listenNodeFilter) {
		this.processDescendants(tree, this.listenNodeFilter, this.unlistenNode, true);
	}
	delete this.listenedTrees[tree.widgetId];
}, checkPathCondition:function (domElement, condition) {
	while (domElement && !domElement.widgetId) {
		if (condition.call(null, domElement)) {
			return true;
		}
		domElement = domElement.parentNode;
	}
	return false;
}, domElement2TreeNode:function (domElement) {
	while (domElement && !domElement.widgetId) {
		domElement = domElement.parentNode;
	}
	if (!domElement) {
		return null;
	}
	var widget = dojo.widget.byId(domElement.widgetId);
	if (!widget.isTreeNode) {
		return null;
	}
	return widget;
}, processDescendants:function (elem, filter, func, skipFirst) {
	var _this = this;
	if (!skipFirst) {
		if (!filter.call(_this, elem)) {
			return;
		}
		func.call(_this, elem);
	}
	var stack = [elem];
	while (elem = stack.pop()) {
		dojo.lang.forEach(elem.children, function (elem) {
			if (filter.call(_this, elem)) {
				func.call(_this, elem);
				stack.push(elem);
			}
		});
	}
}});