/*----------------------------------------------------------------------------\
|                               XLoadTree 1.11                                |
|-----------------------------------------------------------------------------|
|                         Created by Erik Arvidsson                           |
|                  (http://webfx.eae.net/contact.html#erik)                   |
|                      For WebFX (http://webfx.eae.net/)                      |
|-----------------------------------------------------------------------------|
| An extension to xTree that allows sub trees to be loaded at runtime by      |
| reading XML files from the server. Works with IE5+ and Mozilla 1.0+         |
|-----------------------------------------------------------------------------|
|             Copyright (c) 2001, 2002, 2003, 2006 Erik Arvidsson             |
|-----------------------------------------------------------------------------|
| Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| use this file except in compliance with the License.  You may obtain a copy |
| of the License at http://www.apache.org/licenses/LICENSE-2.0                |
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| Unless  required  by  applicable law or  agreed  to  in  writing,  software |
| distributed under the License is distributed on an  "AS IS" BASIS,  WITHOUT |
| WARRANTIES OR  CONDITIONS OF ANY KIND,  either express or implied.  See the |
| License  for the  specific language  governing permissions  and limitations |
| under the License.                                                          |
|-----------------------------------------------------------------------------|
| Dependencies: xtree.js     - original xtree library                         |
|               xtree.css    - simple css styling of xtree                    |
|               xmlextras.js - provides xml http objects and xml document     |
|                              objects                                        |
|-----------------------------------------------------------------------------|
| 2001-09-27 | Original Version Posted.                                       |
| 2002-01-19 | Added some simple error handling and string templates for      |
|            | reporting the errors.                                          |
| 2002-01-28 | Fixed loading issues in IE50 and IE55 that made the tree load  |
|            | twice.                                                         |
| 2002-10-10 | (1.1) Added reload method that reloads the XML file from the   |
|            | server.                                                        |
| 2003-05-06 | Added support for target attribute                             |
| 2006-05-28 | Changed license to Apache Software License 2.0.                |
|-----------------------------------------------------------------------------|
| Created 2001-09-27 | All changes are in the log above. | Updated 2006-05-28 |
\----------------------------------------------------------------------------*/


webFXTreeConfig.loadingText = "Loading...";
webFXTreeConfig.loadErrorTextTemplate = "Error loading \"%1%\"";
webFXTreeConfig.emptyErrorTextTemplate = "Error \"%1%\" does not contain any tree items";

/*
 * WebFXLoadTree class
 */

function WebFXLoadTree(sText, sXmlSrc, sAction, sBehavior, sIcon, sOpenIcon) {
    // call super
    this.WebFXTree = WebFXTree;
    this.WebFXTree(sText, sAction, sBehavior, sIcon, sOpenIcon);

	// setup default property values
    this.src = sXmlSrc;
    this.loading = false;
    this.loaded = false;
    this.errorText = "";

	// check start state and load if open
    if (this.open)
        _startLoadXmlTree(this.src, this);
    else {
        // and create loading item if not
        this._loadingItem = new WebFXTreeItem(webFXTreeConfig.loadingText);
        this.add(this._loadingItem);
    }
}

WebFXLoadTree.prototype = new WebFXTree;

// override the expand method to load the xml file
WebFXLoadTree.prototype._webfxtree_expand = WebFXTree.prototype.expand;
WebFXLoadTree.prototype.expand = function() {
    if (!this.loaded && !this.loading) {
        // load
        _startLoadXmlTree(this.src, this);
    }
    this._webfxtree_expand();
};

/*
 * WebFXLoadTreeItem class
 */

function WebFXLoadTreeItem(sText, sXmlSrc, sAction, eParent, sIcon, sOpenIcon) {
    // call super
    this.WebFXTreeItem = WebFXTreeItem;
    this.WebFXTreeItem(sText, sAction, eParent, sIcon, sOpenIcon);

	// setup default property values
    this.src = sXmlSrc;
    this.loading = false;
    this.loaded = false;
    this.errorText = "";

	// check start state and load if open
    if (this.open)
        _startLoadXmlTree(this.src, this);
    else {
        // and create loading item if not
        this._loadingItem = new WebFXTreeItem(webFXTreeConfig.loadingText);

        this.add(this._loadingItem);
    }
}

WebFXLoadTreeItem.prototype = new WebFXTreeItem;

// override the expand method to load the xml file
WebFXLoadTreeItem.prototype._webfxtreeitem_expand = WebFXTreeItem.prototype.expand;
WebFXLoadTreeItem.prototype.expand = function() {
    if (!this.loaded && !this.loading) {
        // load
        _startLoadXmlTree(this.src, this);
    }
    this._webfxtreeitem_expand();
};

// reloads the src file if already loaded
WebFXLoadTree.prototype.reload =
WebFXLoadTreeItem.prototype.reload = function () {
    // if loading do nothing
    if (this.loaded) {
        var open = this.open;
		// remove
        while (this.childNodes.length > 0)
            this.childNodes[this.childNodes.length - 1].remove();

        this.loaded = false;

        this._loadingItem = new WebFXTreeItem(webFXTreeConfig.loadingText);
        this.add(this._loadingItem);

        if (open)
            this.expand();
    }
    else if (this.open && !this.loading)
        _startLoadXmlTree(this.src, this);
};

/*
 * Helper functions
 */

// creates the xmlhttp object and starts the load of the xml document
function _startLoadXmlTree(sSrc, jsNode) {
    if (jsNode.loading || jsNode.loaded)
        return;
    jsNode.loading = true;
    var xmlHttp = XmlHttp.create();
    xmlHttp.open("GET", sSrc, false);	// async
    xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4) {
            if (xmlHttp.status == 200) {

                _xmlFileLoaded(xmlHttp.responseXML, jsNode);
            }
        }
    };
    xmlHttp.send(null);
    // call in new thread to allow ui to update  修改,使ajax同步提取数据.
    /*window.setTimeout(function () {
        xmlHttp.send(null);
    }, 10);*/
}


// Converts an xml tree to a js tree. See article about xml tree format
function _xmlTreeToJsTree(oNode) {
    // retreive attributes
 
    var text = oNode.getAttribute("text");
    var action = oNode.getAttribute("action");
    var parent = null;
    var icon = oNode.getAttribute("icon");
    var openIcon = oNode.getAttribute("openIcon");
    var src = oNode.getAttribute("src");
    var target = oNode.getAttribute("target");

    // create jsNode
    var jsNode;
    if (src != null && src != "")
        jsNode = new WebFXLoadTreeItem(text, src, action, parent, icon, openIcon);
    else
        jsNode = new WebFXTreeItem(text, action, parent, icon, openIcon);

    if (target != "")
        jsNode.target = target;

	// go through childNOdes
    var cs = oNode.childNodes;
    var l = cs.length;
    for (var i = 0; i < l; i++) {
        if (cs[i].tagName == "tree")
            jsNode.add(_xmlTreeToJsTree(cs[i]), true);
    }

    return jsNode;
}

// Inserts an xml document as a subtree to the provided node
function _xmlFileLoaded(oXmlDoc, jsParentNode) {
    if (jsParentNode.loaded)
        return;

    var bIndent = false;
    var bAnyChildren = false;
    jsParentNode.loaded = true;
    jsParentNode.loading = false;

	// check that the load of the xml file went well
    if (oXmlDoc == null || oXmlDoc.documentElement == null) {

        jsParentNode.errorText = parseTemplateString(webFXTreeConfig.loadErrorTextTemplate,
                jsParentNode.src);
    }
    else {

        // there is one extra level of tree elements
        var root = oXmlDoc.documentElement;

		// loop through all tree children
        var cs = root.childNodes;
        var l = cs.length;
        for (var i = 0; i < l; i++) {
            if (cs[i].tagName == "tree") {
                bAnyChildren = true;
                bIndent = true;
              
                jsParentNode.add(_xmlTreeToJsTree(cs[i]), true);
            }
        }

		// if no children we got an error
        if (!bAnyChildren)
            jsParentNode.errorText = parseTemplateString(webFXTreeConfig.emptyErrorTextTemplate,
                    jsParentNode.src);
    }

	// remove dummy
    if (jsParentNode._loadingItem != null) {
        jsParentNode._loadingItem.remove();
        bIndent = true;
    }

    if (bIndent) {
        // indent now that all items are added
        jsParentNode.indent();
    }

	// show error in status bar
    if (jsParentNode.errorText != "")
        window.status = jsParentNode.errorText;
}

// parses a string and replaces %n% with argument nr n
function parseTemplateString(sTemplate) {
    var args = arguments;
    var s = sTemplate;

    s = s.replace(/\%\%/g, "%");

    for (var i = 1; i < args.length; i++)
        s = s.replace(new RegExp("\%" + i + "\%", "g"), args[i])

    return s;
}