/*
 * Ext JS Library 1.0.1
 * Copyright(c) 2006-2007, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://www.extjs.com/license
 */

/**
 * @class Ext.grid.EditorGrid
 * @extends Ext.grid.Grid
 * Class for creating and editable grid.
 * @param {String/HTMLElement/Ext.Element} container The element into which this grid will be rendered - 
 * The container MUST have some type of size defined for the grid to fill. The container will be 
 * automatically set to position relative if it isn't already.
 * @param {Object} dataSource The data model to bind to
 * @param {Object} colModel The column model with info about this grid's columns
 */
Ext.grid.EditorGrid = function(container, config){
    Ext.grid.EditorGrid.superclass.constructor.call(this, container, config);
    this.container.addClass("xedit-grid");

    if(!this.selModel){
        this.selModel = new Ext.grid.CellSelectionModel();
    }

    this.activeEditor = null;

	this.addEvents({
	    /**
	     * @event beforeedit
	     * Fires before cell editing is triggered. The edit event object has the following properties <br />
	     * <ul style="padding:5px;padding-left:16px;">
	     * <li>grid - This grid</li>
	     * <li>record - The record being edited</li>
	     * <li>field - The field name being edited</li>
	     * <li>value - The value for the field being edited.</li>
	     * <li>row - The grid row index</li>
	     * <li>column - The grid column index</li>
	     * <li>cancel - Set this to true to cancel the edit or return false from your handler.</li>
	     * </ul>
	     * @param {Object} e An edit event (see above for description)
	     */
	    "beforeedit" : true,
	    /**
	     * @event afteredit
	     * Fires after a cell is edited. <br />
	     * <ul style="padding:5px;padding-left:16px;">
	     * <li>grid - This grid</li>
	     * <li>record - The record being edited</li>
	     * <li>field - The field name being edited</li>
	     * <li>value - The value being set</li>
	     * <li>originalValue - The original value for the field, before the edit.</li>
	     * <li>row - The grid row index</li>
	     * <li>column - The grid column index</li>
	     * </ul>
	     * @param {Object} e An edit event (see above for description)
	     */
	    "afteredit" : true,
	    /**
	     * @event validateedit
	     * Fires after a cell is edited, but before the value is set in the record. Return false
	     * to cancel the change. The edit event object has the following properties <br />
	     * <ul style="padding:5px;padding-left:16px;">
	     * <li>grid - This grid</li>
	     * <li>record - The record being edited</li>
	     * <li>field - The field name being edited</li>
	     * <li>value - The value being set</li>
	     * <li>originalValue - The original value for the field, before the edit.</li>
	     * <li>row - The grid row index</li>
	     * <li>column - The grid column index</li>
	     * <li>cancel - Set this to true to cancel the edit or return false from your handler.</li>
	     * </ul>
	     * @param {Object} e An edit event (see above for description)
	     */
	    "validateedit" : true
	});
    this.on("bodyscroll", this.stopEditing,  this);
    this.on(this.clicksToEdit == 1 ? "cellclick" : "celldblclick", this.onCellDblClick,  this);
};

Ext.extend(Ext.grid.EditorGrid, Ext.grid.Grid, {
    isEditor : true,
    clicksToEdit: 2,
    trackMouseOver: false, // causes very odd FF errors

    onCellDblClick : function(g, row, col){
        this.startEditing(row, col);
    },

    onEditComplete : function(ed, value, startValue){
        this.editing = false;
        this.activeEditor = null;
        ed.un("specialkey", this.selModel.onEditorKey, this.selModel);
        if(String(value) != String(startValue)){
            var r = ed.record;
            var field = this.colModel.getDataIndex(ed.col);
            var e = {
                grid: this,
                record: r,
                field: field,
                originalValue: startValue,
                value: value,
                row: ed.row,
                column: ed.col,
                cancel:false
            };
            if(this.fireEvent("validateedit", e) !== false && !e.cancel){
                r.set(field, e.value);
                delete e.cancel;
                this.fireEvent("afteredit", e);
            }
        }
        this.view.focusCell(ed.row, ed.col);
    },

    /**
     * Starts editing the specified for the specified row/column
     * @param {Number} rowIndex
     * @param {Number} colIndex
     */
    startEditing : function(row, col){
        this.stopEditing();
        if(this.colModel.isCellEditable(col, row)){
            this.view.focusCell(row, col);
            var r = this.dataSource.getAt(row);
            var field = this.colModel.getDataIndex(col);
            var e = {
                grid: this,
                record: r,
                field: field,
                value: r.data[field],
                row: row,
                column: col,
                cancel:false
            };
            if(this.fireEvent("beforeedit", e) !== false && !e.cancel){
                this.editing = true; // flag for buffering of orphan key strokes
                (function(){ // complex but required for focus issues in safari, ie and opera
                    var ed = this.colModel.getCellEditor(col, row);
                    ed.row = row;
                    ed.col = col;
                    ed.record = r;
                    ed.on("complete", this.onEditComplete, this, {single: true});
                    ed.on("specialkey", this.selModel.onEditorKey, this.selModel);
                    this.activeEditor = ed;
                    var v = r.data[field];
                    ed.startEdit(this.view.getCell(row, col), v);
                }).defer(50, this);
            }
        }
    },
        
    /**
     * Stops any active editing
     */
    stopEditing : function(){
        if(this.activeEditor){
            this.activeEditor.completeEdit();
        }
        this.activeEditor = null;
    }
});