treenode.js

一个struts和extjs得源码

/*
 * Ext JS Library 2.2.1
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.tree.TreeNode
 * @extends Ext.data.Node
 * @cfg {String} text The text for this node
 * @cfg {Boolean} expanded true to start the node expanded
 * @cfg {Boolean} allowDrag False to make this node undraggable if {@link #draggable} = true (defaults to true)
 * @cfg {Boolean} allowDrop False if this node cannot have child nodes dropped on it (defaults to true)
 * @cfg {Boolean} disabled true to start the node disabled
 * @cfg {String} icon The path to an icon for the node. The preferred way to do this
 * is to use the cls or iconCls attributes and add the icon via a CSS background image.
 * @cfg {String} cls A css class to be added to the node
 * @cfg {String} iconCls A css class to be added to the nodes icon element for applying css background images
 * @cfg {String} href URL of the link used for the node (defaults to #)
 * @cfg {String} hrefTarget target frame for the link
 * @cfg {String} qtip An Ext QuickTip for the node
 * @cfg {Boolean} expandable If set to true, the node will always show a plus/minus icon, even when empty
 * @cfg {String} qtipCfg An Ext QuickTip config for the node (used instead of qtip)
 * @cfg {Boolean} singleClickExpand True for single click expand on this node
 * @cfg {Function} uiProvider A UI <b>class</b> to use for this node (defaults to Ext.tree.TreeNodeUI)
 * @cfg {Boolean} checked True to render a checked checkbox for this node, false to render an unchecked checkbox
 * (defaults to undefined with no checkbox rendered)
 * @cfg {Boolean} draggable True to make this node draggable (defaults to false)
 * @cfg {Boolean} isTarget False to not allow this node to act as a drop target (defaults to true)
 * @cfg {Boolean} allowChildren False to not allow this node to have child nodes (defaults to true)
 * @constructor
 * @param {Object/String} attributes The attributes/config for the node or just a string with the text for the node
 */
Ext.tree.TreeNode = function(attributes){
    attributes = attributes || {};
    if(typeof attributes == "string"){
        attributes = {text: attributes};
    }
    this.childrenRendered = false;
    this.rendered = false;
    Ext.tree.TreeNode.superclass.constructor.call(this, attributes);
    this.expanded = attributes.expanded === true;
    this.isTarget = attributes.isTarget !== false;
    this.draggable = attributes.draggable !== false && attributes.allowDrag !== false;
    this.allowChildren = attributes.allowChildren !== false && attributes.allowDrop !== false;

    /**
     * Read-only. The text for this node. To change it use setText().
     * @type String
     */
    this.text = attributes.text;
    /**
     * True if this node is disabled.
     * @type Boolean
     */
    this.disabled = attributes.disabled === true;

    this.addEvents(
        /**
        * @event textchange
        * Fires when the text for this node is changed
        * @param {Node} this This node
        * @param {String} text The new text
        * @param {String} oldText The old text
        */
        "textchange",
        /**
        * @event beforeexpand
        * Fires before this node is expanded, return false to cancel.
        * @param {Node} this This node
        * @param {Boolean} deep
        * @param {Boolean} anim
        */
        "beforeexpand",
        /**
        * @event beforecollapse
        * Fires before this node is collapsed, return false to cancel.
        * @param {Node} this This node
        * @param {Boolean} deep
        * @param {Boolean} anim
        */
        "beforecollapse",
        /**
        * @event expand
        * Fires when this node is expanded
        * @param {Node} this This node
        */
        "expand",
        /**
        * @event disabledchange
        * Fires when the disabled status of this node changes
        * @param {Node} this This node
        * @param {Boolean} disabled
        */
        "disabledchange",
        /**
        * @event collapse
        * Fires when this node is collapsed
        * @param {Node} this This node
        */
        "collapse",
        /**
        * @event beforeclick
        * Fires before click processing. Return false to cancel the default action.
        * @param {Node} this This node
        * @param {Ext.EventObject} e The event object
        */
        "beforeclick",
        /**
        * @event click
        * Fires when this node is clicked
        * @param {Node} this This node
        * @param {Ext.EventObject} e The event object
        */
        "click",
        /**
        * @event checkchange
        * Fires when a node with a checkbox's checked property changes
        * @param {Node} this This node
        * @param {Boolean} checked
        */
        "checkchange",
        /**
        * @event dblclick
        * Fires when this node is double clicked
        * @param {Node} this This node
        * @param {Ext.EventObject} e The event object
        */
        "dblclick",
        /**
        * @event contextmenu
        * Fires when this node is right clicked
        * @param {Node} this This node
        * @param {Ext.EventObject} e The event object
        */
        "contextmenu",
        /**
        * @event beforechildrenrendered
        * Fires right before the child nodes for this node are rendered
        * @param {Node} this This node
        */
        "beforechildrenrendered"
    );

    var uiClass = this.attributes.uiProvider || this.defaultUI || Ext.tree.TreeNodeUI;

    /**
     * Read-only. The UI for this node
     * @type TreeNodeUI
     */
    this.ui = new uiClass(this);
};
Ext.extend(Ext.tree.TreeNode, Ext.data.Node, {
    preventHScroll: true,
    /**
     * Returns true if this node is expanded
     * @return {Boolean}
     */
    isExpanded : function(){
        return this.expanded;
    },

/**
 * Returns the UI object for this node.
 * @return {TreeNodeUI} The object which is providing the user interface for this tree
 * node. Unless otherwise specified in the {@link #uiProvider}, this will be an instance
 * of {@link Ext.tree.TreeNodeUI}
 */
    getUI : function(){
        return this.ui;
    },

    getLoader : function(){
        var owner;
        return this.loader || ((owner = this.getOwnerTree()) && owner.loader ? owner.loader : new Ext.tree.TreeLoader());
    },

    // private override
    setFirstChild : function(node){
        var of = this.firstChild;
        Ext.tree.TreeNode.superclass.setFirstChild.call(this, node);
        if(this.childrenRendered && of && node != of){
            of.renderIndent(true, true);
        }
        if(this.rendered){
            this.renderIndent(true, true);
        }
    },

    // private override
    setLastChild : function(node){
        var ol = this.lastChild;
        Ext.tree.TreeNode.superclass.setLastChild.call(this, node);
        if(this.childrenRendered && ol && node != ol){
            ol.renderIndent(true, true);
        }
        if(this.rendered){
            this.renderIndent(true, true);
        }
    },

    // these methods are overridden to provide lazy rendering support
    // private override
    appendChild : function(n){
        if(!n.render && !Ext.isArray(n)){
            n = this.getLoader().createNode(n);
        }
        var node = Ext.tree.TreeNode.superclass.appendChild.call(this, n);
        if(node && this.childrenRendered){
            node.render();
        }
        this.ui.updateExpandIcon();
        return node;
    },

    // private override
    removeChild : function(node){
        this.ownerTree.getSelectionModel().unselect(node);
        Ext.tree.TreeNode.superclass.removeChild.apply(this, arguments);
        // if it's been rendered remove dom node
        if(this.childrenRendered){
            node.ui.remove();
        }
        if(this.childNodes.length < 1){
            this.collapse(false, false);
        }else{
            this.ui.updateExpandIcon();
        }
        if(!this.firstChild && !this.isHiddenRoot()) {
            this.childrenRendered = false;
        }
        return node;
    },

    // private override
    insertBefore : function(node, refNode){
        if(!node.render){ 
            node = this.getLoader().createNode(node);
        }
        var newNode = Ext.tree.TreeNode.superclass.insertBefore.apply(this, arguments);
        if(newNode && refNode && this.childrenRendered){
            node.render();
        }
        this.ui.updateExpandIcon();
        return newNode;
    },

    /**
     * Sets the text for this node
     * @param {String} text
     */
    setText : function(text){
        var oldText = this.text;
        this.text = text;
        this.attributes.text = text;
        if(this.rendered){ // event without subscribing
            this.ui.onTextChange(this, text, oldText);
        }
        this.fireEvent("textchange", this, text, oldText);
    },