/*
 * Ext JS Library 3.0 RC1
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */

Ext.grid.RowExpander = Ext.extend(Ext.util.Observable, {
    header: "",
    width: 20,
    sortable: false,
    fixed:true,
    menuDisabled:true,
    dataIndex: '',
    id: 'expander',
    lazyRender : true,
    enableCaching: true,
    
    expandOnEnter: true,
    expandOnDblClick: true,
    
    constructor: function(config){
        Ext.apply(this, config);

        this.addEvents({
            beforeexpand : true,
            expand: true,
            beforecollapse: true,
            collapse: true
        });

        Ext.grid.RowExpander.superclass.constructor.call(this);

        if(this.tpl){
            if(typeof this.tpl == 'string'){
                this.tpl = new Ext.Template(this.tpl);
            }
            this.tpl.compile();
        }

        this.state = {};
        this.bodyContent = {};
    },
    
    getRowClass : function(record, rowIndex, p, ds){
        p.cols = p.cols-1;
        var content = this.bodyContent[record.id];
        if(!content && !this.lazyRender){
            content = this.getBodyContent(record, rowIndex);
        }
        if(content){
            p.body = content;
        }
        return this.state[record.id] ? 'x-grid3-row-expanded' : 'x-grid3-row-collapsed';
    },

    init : function(grid){
        this.grid = grid;

        var view = grid.getView();
        view.getRowClass = this.getRowClass.createDelegate(this);

        view.enableRowBody = true;


        grid.on('render', this.onRender, this);
    },
    
    onRender: function() {
        var grid = this.grid;
        var mainBody = grid.getView().mainBody;
        mainBody.on('mousedown', this.onMouseDown, this, {delegate: '.x-grid3-row-expander'});
        if (this.expandOnEnter) {            
            this.keyNav = new Ext.KeyNav(this.grid.getGridEl(), {
                "enter" : this.onEnter,
                scope: this        
            });    
        }
        if (this.expandOnDblClick) {
            grid.on('rowdblclick', this.onRowDblClick, this);
        }
    },
    
    onRowDblClick: function(grid, rowIdx, e) {
        this.toggleRow(rowIdx);
    },
    
    onEnter: function(e) {
        var g = this.grid;
        var sm = g.getSelectionModel();
        var sels = sm.getSelections();
        for (var i = 0, len = sels.length; i < len; i++) {
            var rowIdx = g.getStore().indexOf(sels[i]);
            this.toggleRow(rowIdx);
        }
    },

    getBodyContent : function(record, index){
        if(!this.enableCaching){
            return this.tpl.apply(record.data);
        }
        var content = this.bodyContent[record.id];
        if(!content){
            content = this.tpl.apply(record.data);
            this.bodyContent[record.id] = content;
        }
        return content;
    },

    onMouseDown : function(e, t){
        e.stopEvent();
        var row = e.getTarget('.x-grid3-row');
        this.toggleRow(row);
    },

    renderer : function(v, p, record){
        p.cellAttr = 'rowspan="2"';
        return '<div class="x-grid3-row-expander">&#160;</div>';
    },

    beforeExpand : function(record, body, rowIndex){
        if(this.fireEvent('beforeexpand', this, record, body, rowIndex) !== false){
            if(this.tpl && this.lazyRender){
                body.innerHTML = this.getBodyContent(record, rowIndex);
            }
            return true;
        }else{
            return false;
        }
    },

    toggleRow : function(row){
        if(typeof row == 'number'){
            row = this.grid.view.getRow(row);
        }
        this[Ext.fly(row).hasClass('x-grid3-row-collapsed') ? 'expandRow' : 'collapseRow'](row);
    },

    expandRow : function(row){
        if(typeof row == 'number'){
            row = this.grid.view.getRow(row);
        }
        var record = this.grid.store.getAt(row.rowIndex);
        var body = Ext.DomQuery.selectNode('tr:nth(2) div.x-grid3-row-body', row);
        if(this.beforeExpand(record, body, row.rowIndex)){
            this.state[record.id] = true;
            Ext.fly(row).replaceClass('x-grid3-row-collapsed', 'x-grid3-row-expanded');
            this.fireEvent('expand', this, record, body, row.rowIndex);
        }
    },

    collapseRow : function(row){
        if(typeof row == 'number'){
            row = this.grid.view.getRow(row);
        }
        var record = this.grid.store.getAt(row.rowIndex);
        var body = Ext.fly(row).child('tr:nth(1) div.x-grid3-row-body', true);
        if(this.fireEvent('beforecollapse', this, record, body, row.rowIndex) !== false){
            this.state[record.id] = false;
            Ext.fly(row).replaceClass('x-grid3-row-expanded', 'x-grid3-row-collapsed');
            this.fireEvent('collapse', this, record, body, row.rowIndex);
        }
    }
});