/**
 * @class Ext.grid.column.Action
 * @extends Ext.grid.column.Column
 * <p>A Grid header type which renders an icon, or a series of icons in a grid cell, and offers a scoped click
 * handler for each icon.</p>
 *
 * {@img Ext.grid.column.Action/Ext.grid.column.Action.png Ext.grid.column.Action grid column}
 *  
 * ## Code
 *     Ext.create('Ext.data.Store', {
 *         storeId:'employeeStore',
 *         fields:['firstname', 'lastname', 'senority', 'dep', 'hired'],
 *         data:[
 *             {firstname:"Michael", lastname:"Scott"},
 *             {firstname:"Dwight", lastname:"Schrute"},
 *             {firstname:"Jim", lastname:"Halpert"},
 *             {firstname:"Kevin", lastname:"Malone"},
 *             {firstname:"Angela", lastname:"Martin"}                        
 *         ]
 *     });
 *     
 *     Ext.create('Ext.grid.Panel', {
 *         title: 'Action Column Demo',
 *         store: Ext.data.StoreManager.lookup('employeeStore'),
 *         columns: [
 *             {text: 'First Name',  dataIndex:'firstname'},
 *             {text: 'Last Name',  dataIndex:'lastname'},
 *             {
 *                 xtype:'actioncolumn', 
 *                 width:50,
 *                 items: [{
 *                     icon: 'images/edit.png',  // Use a URL in the icon config
 *                     tooltip: 'Edit',
 *                     handler: function(grid, rowIndex, colIndex) {
 *                         var rec = grid.getStore().getAt(rowIndex);
 *                         alert("Edit " + rec.get('firstname'));
 *                     }
 *                 },{
 *                     icon: 'images/delete.png',
 *                     tooltip: 'Delete',
 *                     handler: function(grid, rowIndex, colIndex) {
 *                         var rec = grid.getStore().getAt(rowIndex);
 *                         alert("Terminate " + rec.get('firstname'));
 *                     }                
 *                 }]
 *             }
 *         ],
 *         width: 250,
 *         renderTo: Ext.getBody()
 *     });
 * <p>The action column can be at any index in the columns array, and a grid can have any number of
 * action columns. </p>
 */
Ext.define('Ext.grid.column.Action', {
    extend: 'Ext.grid.column.Column',
    alias: ['widget.actioncolumn'],
    alternateClassName: 'Ext.grid.ActionColumn',

    /**
     * @cfg {String} icon
     * The URL of an image to display as the clickable element in the column. 
     * Optional - defaults to <code>{@link Ext#BLANK_IMAGE_URL Ext.BLANK_IMAGE_URL}</code>.
     */
    /**
     * @cfg {String} iconCls
     * A CSS class to apply to the icon image. To determine the class dynamically, configure the Column with a <code>{@link #getClass}</code> function.
     */
    /**
     * @cfg {Function} handler A function called when the icon is clicked.
     * The handler is passed the following parameters:<div class="mdetail-params"><ul>
     * <li><code>view</code> : TableView<div class="sub-desc">The owning TableView.</div></li>
     * <li><code>rowIndex</code> : Number<div class="sub-desc">The row index clicked on.</div></li>
     * <li><code>colIndex</code> : Number<div class="sub-desc">The column index clicked on.</div></li>
     * <li><code>item</code> : Object<div class="sub-desc">The clicked item (or this Column if multiple 
     * {@link #items} were not configured).</div></li>
     * <li><code>e</code> : Event<div class="sub-desc">The click event.</div></li>
     * </ul></div>
     */
    /**
     * @cfg {Object} scope The scope (<tt><b>this</b></tt> reference) in which the <code>{@link #handler}</code>
     * and <code>{@link #getClass}</code> fuctions are executed. Defaults to this Column.
     */
    /**
     * @cfg {String} tooltip A tooltip message to be displayed on hover. {@link Ext.tip.QuickTipManager#init Ext.tip.QuickTipManager} must have 
     * been initialized.
     */
    /**
     * @cfg {Boolean} stopSelection Defaults to <code>true</code>. Prevent grid <i>row</i> selection upon mousedown.
     */
    /**
     * @cfg {Function} getClass A function which returns the CSS class to apply to the icon image.
     * The function is passed the following parameters:<ul>
     *     <li><b>v</b> : Object<p class="sub-desc">The value of the column's configured field (if any).</p></li>
     *     <li><b>metadata</b> : Object<p class="sub-desc">An object in which you may set the following attributes:<ul>
     *         <li><b>css</b> : String<p class="sub-desc">A CSS class name to add to the cell's TD element.</p></li>
     *         <li><b>attr</b> : String<p class="sub-desc">An HTML attribute definition string to apply to the data container element <i>within</i> the table cell
     *         (e.g. 'style="color:red;"').</p></li>
     *     </ul></p></li>
     *     <li><b>r</b> : Ext.data.Record<p class="sub-desc">The Record providing the data.</p></li>
     *     <li><b>rowIndex</b> : Number<p class="sub-desc">The row index..</p></li>
     *     <li><b>colIndex</b> : Number<p class="sub-desc">The column index.</p></li>
     *     <li><b>store</b> : Ext.data.Store<p class="sub-desc">The Store which is providing the data Model.</p></li>
     * </ul>
     */
    /**
     * @cfg {Array} items An Array which may contain multiple icon definitions, each element of which may contain:
     * <div class="mdetail-params"><ul>
     * <li><code>icon</code> : String<div class="sub-desc">The url of an image to display as the clickable element 
     * in the column.</div></li>
     * <li><code>iconCls</code> : String<div class="sub-desc">A CSS class to apply to the icon image.
     * To determine the class dynamically, configure the item with a <code>getClass</code> function.</div></li>
     * <li><code>getClass</code> : Function<div class="sub-desc">A function which returns the CSS class to apply to the icon image.
     * The function is passed the following parameters:<ul>
     *     <li><b>v</b> : Object<p class="sub-desc">The value of the column's configured field (if any).</p></li>
     *     <li><b>metadata</b> : Object<p class="sub-desc">An object in which you may set the following attributes:<ul>
     *         <li><b>css</b> : String<p class="sub-desc">A CSS class name to add to the cell's TD element.</p></li>
     *         <li><b>attr</b> : String<p class="sub-desc">An HTML attribute definition string to apply to the data container element <i>within</i> the table cell
     *         (e.g. 'style="color:red;"').</p></li>
     *     </ul></p></li>
     *     <li><b>r</b> : Ext.data.Record<p class="sub-desc">The Record providing the data.</p></li>
     *     <li><b>rowIndex</b> : Number<p class="sub-desc">The row index..</p></li>
     *     <li><b>colIndex</b> : Number<p class="sub-desc">The column index.</p></li>
     *     <li><b>store</b> : Ext.data.Store<p class="sub-desc">The Store which is providing the data Model.</p></li>
     * </ul></div></li>
     * <li><code>handler</code> : Function<div class="sub-desc">A function called when the icon is clicked.</div></li>
     * <li><code>scope</code> : Scope<div class="sub-desc">The scope (<code><b>this</b></code> reference) in which the 
     * <code>handler</code> and <code>getClass</code> functions are executed. Fallback defaults are this Column's
     * configured scope, then this Column.</div></li>
     * <li><code>tooltip</code> : String<div class="sub-desc">A tooltip message to be displayed on hover. 
     * {@link Ext.tip.QuickTipManager#init Ext.tip.QuickTipManager} must have been initialized.</div></li>
     * </ul></div>
     */
    header: '&#160;',

    actionIdRe: /x-action-col-(\d+)/,

    /**
     * @cfg {String} altText The alt text to use for the image element. Defaults to <tt>''</tt>.
     */
    altText: '',
    
    sortable: false,

    constructor: function(config) {
        var me = this,
            cfg = Ext.apply({}, config),
            items = cfg.items || [me],
            l = items.length,
            i,
            item;

        // This is a Container. Delete the items config to be reinstated after construction.
        delete cfg.items;
        me.callParent([cfg]);

        // Items is an array property of ActionColumns
        me.items = items;

//      Renderer closure iterates through items creating an <img> element for each and tagging with an identifying 
//      class name x-action-col-{n}
        me.renderer = function(v, meta) {
//          Allow a configured renderer to create initial value (And set the other values in the "metadata" argument!)
            v = Ext.isFunction(cfg.renderer) ? cfg.renderer.apply(this, arguments)||'' : '';

            meta.tdCls += ' ' + Ext.baseCSSPrefix + 'action-col-cell';
            for (i = 0; i < l; i++) {
                item = items[i];
                v += '<img alt="' + (item.altText || me.altText) + '" src="' + (item.icon || Ext.BLANK_IMAGE_URL) +
                    '" class="' + Ext.baseCSSPrefix + 'action-col-icon ' + Ext.baseCSSPrefix + 'action-col-' + String(i) + ' ' +  (item.iconCls || '') + 
                    ' ' + (Ext.isFunction(item.getClass) ? item.getClass.apply(item.scope||me.scope||me, arguments) : (me.iconCls || '')) + '"' +
                    ((item.tooltip) ? ' data-qtip="' + item.tooltip + '"' : '') + ' />';
            }
            return v;
        };
    },

    destroy: function() {
        delete this.items;
        delete this.renderer;
        return this.callParent(arguments);
    },

    /**
     * @private
     * Process and refire events routed from the GridView's processEvent method.
     * Also fires any configured click handlers. By default, cancels the mousedown event to prevent selection.
     * Returns the event handler's status to allow canceling of GridView's bubbling process.
     */
    processEvent : function(type, view, cell, recordIndex, cellIndex, e){
        var me = this,
            match = e.getTarget().className.match(me.actionIdRe),
            item, fn;
        if (match) {
            item = me.items[parseInt(match[1], 10)];
            if (item) {
                if (type == 'click') {
                    fn = item.handler || me.handler;
                    if (fn) {
                        fn.call(item.scope || me.scope || me, view, recordIndex, cellIndex, item, e);
                    }
                } else if (type == 'mousedown' && item.stopSelection !== false) {
                    return false;
                }
            }
        }
        return me.callParent(arguments);
    },

    cascade: function(fn, scope) {
        fn.call(scope||this, this);
    },

    // Private override because this cannot function as a Container, and it has an items property which is an Array, NOT a MixedCollection.
    getRefItems: function() {
        return [];
    }
});