/*!
 * Ext JS Library 3.0.0
 * Copyright(c) 2006-2009 Ext JS, LLC
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
/**

 * @class Ext.grid.CheckboxSelectionModel

 * @extends Ext.grid.RowSelectionModel

 * A custom selection model that renders a column of checkboxes that can be toggled to select or deselect rows.

 * @constructor

 * @param {Object} config The configuration options

 */

Ext.grid.CheckboxSelectionModel = Ext.extend(Ext.grid.RowSelectionModel, {



    /**

     * @cfg {Boolean} checkOnly <tt>true</tt> if rows can only be selected by clicking on the

     * checkbox column (defaults to <tt>false</tt>).

     */

    /**

     * @cfg {String} header Any valid text or HTML fragment to display in the header cell for the

     * checkbox column.  Defaults to:<pre><code>

     * '&lt;div class="x-grid3-hd-checker">&#38;#160;&lt;/div>'</tt>

     * </code></pre>

     * The default CSS class of <tt>'x-grid3-hd-checker'</tt> displays a checkbox in the header

     * and provides support for automatic check all/none behavior on header click. This string

     * can be replaced by any valid HTML fragment, including a simple text string (e.g.,

     * <tt>'Select Rows'</tt>), but the automatic check all/none behavior will only work if the

     * <tt>'x-grid3-hd-checker'</tt> class is supplied.

     */

    header: '<div class="x-grid3-hd-checker">&#160;</div>',

    /**

     * @cfg {Number} width The default width in pixels of the checkbox column (defaults to <tt>20</tt>).

     */

    width: 20,

    /**

     * @cfg {Boolean} sortable <tt>true</tt> if the checkbox column is sortable (defaults to

     * <tt>false</tt>).

     */

    sortable: false,



    // private

    menuDisabled:true,

    fixed:true,

    dataIndex: '',

    id: 'checker',



    constructor: function(){

        Ext.grid.CheckboxSelectionModel.superclass.constructor.apply(this, arguments);



        if(this.checkOnly){

            this.handleMouseDown = Ext.emptyFn;

        }

    },



    // private

    initEvents : function(){

        Ext.grid.CheckboxSelectionModel.superclass.initEvents.call(this);

        this.grid.on('render', function(){

            var view = this.grid.getView();

            view.mainBody.on('mousedown', this.onMouseDown, this);

            Ext.fly(view.innerHd).on('mousedown', this.onHdMouseDown, this);



        }, this);

    },



    // private

    onMouseDown : function(e, t){

        if(e.button === 0 && t.className == 'x-grid3-row-checker'){ // Only fire if left-click

            e.stopEvent();

            var row = e.getTarget('.x-grid3-row');

            if(row){

                var index = row.rowIndex;

                if(this.isSelected(index)){

                    this.deselectRow(index);

                }else{

                    this.selectRow(index, true);

                }

            }

        }

    },



    // private

    onHdMouseDown : function(e, t){

        if(t.className == 'x-grid3-hd-checker'){

            e.stopEvent();

            var hd = Ext.fly(t.parentNode);

            var isChecked = hd.hasClass('x-grid3-hd-checker-on');

            if(isChecked){

                hd.removeClass('x-grid3-hd-checker-on');

                this.clearSelections();

            }else{

                hd.addClass('x-grid3-hd-checker-on');

                this.selectAll();

            }

        }

    },



    // private

    renderer : function(v, p, record){

        return '<div class="x-grid3-row-checker">&#160;</div>';

    }

});