# TreeEditor.js

    /**
     * @class Ext.tree.TreeEditor
     * @extends Ext.Editor
     * Provides editor functionality for inline tree node editing.  Any valid {@link Ext.form.Field} can be used
     * as the editor field.
     * @constructor
     * @param {TreePanel} tree
     * @param {Object} config Either a prebuilt {@link Ext.form.Field} instance or a Field config object
     */
    Ext.tree.TreeEditor = function(tree, config){
        config = config || {};
        var field = config.events ? config : new Ext.form.TextField(config);
        Ext.tree.TreeEditor.superclass.constructor.call(this, field);

        this.tree = tree;

        tree.on('beforeclick', this.beforeNodeClick, this);
        tree.getTreeEl().on('mousedown', this.hide, this);
        this.on('complete', this.updateNode, this);
        this.on('beforestartedit', this.fitToTree, this);
        this.on('startedit', this.bindScroll, this, {delay:10});
        this.on('specialkey', this.onSpecialKey, this);
    };

    Ext.extend(Ext.tree.TreeEditor, Ext.Editor, {
        /**
         * @cfg {String} alignment
         * The position to align to (see {@link Ext.Element#alignTo} for more details, defaults to "l-l").
         */
        alignment: "l-l",
        // inherit
        autoSize: false,
        /**
         * @cfg {Boolean} hideEl
         * True to hide the bound element while the editor is displayed (defaults to false)
         */
        hideEl : false,
        /**
         * @cfg {String} cls
         * CSS class to apply to the editor (defaults to "x-small-editor x-tree-editor")
         */
        cls: "x-small-editor x-tree-editor",
        /**
         * @cfg {Boolean} shim
         * True to shim the editor if selects/iframes could be displayed beneath it (defaults to false)
         */
        shim:false,
        // inherit
        shadow:"frame",
        /**
         * @cfg {Number} maxWidth
         * The maximum width in pixels of the editor field (defaults to 250).  Note that if the maxWidth would exceed
         * the containing tree element's size, it will be automatically limited for you to the container width, taking
         * scroll and client offsets into account prior to each edit.
         */
        maxWidth: 250,

        editDelay : 350,

        // private
        fitToTree : function(ed, el){
            var td = this.tree.getTreeEl().dom, nd = el.dom;
            if(td.scrollLeft >  nd.offsetLeft){ // ensure the node left point is visible
                td.scrollLeft = nd.offsetLeft;
            }
            var w = Math.min(
                    this.maxWidth,
                    (td.clientWidth > 20 ? td.clientWidth : td.offsetWidth) - Math.max(0, nd.offsetLeft-td.scrollLeft) - /*cushion*/5);
            this.setSize(w, '');
        },

        // private
        triggerEdit : function(node){
            this.completeEdit();
            this.editNode = node;
            this.startEdit(node.ui.textNode, node.text);
        },

        // private
        bindScroll : function(){
            this.tree.getTreeEl().on('scroll', this.cancelEdit, this);
        },

        // private
        beforeNodeClick : function(node, e){
            var sinceLast = (this.lastClick ? this.lastClick.getElapsed() : 0);
            this.lastClick = new Date();
            if(sinceLast > this.editDelay && this.tree.getSelectionModel().isSelected(node)){
                e.stopEvent();
                this.triggerEdit(node);
                return false;
            }
        },

        // private
        updateNode : function(ed, value){
            this.tree.getTreeEl().un('scroll', this.cancelEdit, this);
            this.editNode.setText(value);
        },

        // private
        onHide : function(){
            Ext.tree.TreeEditor.superclass.onHide.call(this);
            if(this.editNode){
                this.editNode.ui.focus();
            }
        },

        // private
        onSpecialKey : function(field, e){
            var k = e.getKey();
            if(k == e.ESC){
                e.stopEvent();
                this.cancelEdit();
            }else if(k == e.ENTER && !e.hasModifier()){
                e.stopEvent();
                this.completeEdit();
            }
        }
    });

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