tabpanel.js

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/*
 * Ext JS Library 2.2
 * Copyright(c) 2006-2008, Ext JS, LLC.
 * [e-mail]
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.TabPanel
 * <p>A basic tab container. TabPanels can be used exactly like a standard {@link Ext.Panel} for layout
 * purposes, but also have special support for containing child Components that are managed using a CardLayout
 * layout manager, and displayed as seperate tabs.</p>
 * <p>There is no actual tab class &mdash; each tab is simply an {@link Ext.BoxComponent Component} such
 * as a {@link Ext.Panel Panel}. However, when rendered in a TabPanel, each child Component can fire
 * additional events that only exist for tabs and are not available from other Component. These are:</p>
 * <ul>
 * <li><b>activate</b>: Fires when this Component becomes the active tab.
 * <div class="mdetail-params">
 *      <strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong>
 *      <ul><li><code>tab</code> : Panel<div class="sub-desc">The tab that was activated</div></li></ul>
 *  </div></li>
 * <li><b>deactivate</b>: Fires when the Component that was the active tab becomes deactivated.
 * <div class="mdetail-params">
 *      <strong style="font-weight: normal;">Listeners will be called with the following arguments:</strong>
 *      <ul><li><code>tab</code> : Panel<div class="sub-desc">The tab that was deactivated</div></li></ul>
 *  </div></li>
 * </ul>
 * <p>To add Components to a TabPanel which are generated dynamically on the server, it is necessary to
 * create a server script to generate the Javascript to create the Component required.</p>
 * For example, to add a GridPanel to a TabPanel where the GridPanel is generated by the server
 * based on certain parameters, you would need to execute an Ajax request to invoke your the script,
 * and process the response object to add it to the TabPanel:</p><pre><code>
Ext.Ajax.request({
    url: 'gen-invoice-grid.php',
    params: {
        startDate = Ext.getCmp('start-date').getValue(),
        endDate = Ext.getCmp('end-date').getValue()
    },
    success: function(xhr) {
        var newComponent = eval(xhr.responseText);
        myTabPanel.add(newComponent);
        myTabPanel.setActiveTab(newComponent);
    },
    failure: function() {
    	Ext.Msg.alert("Grid create failed", "Server communication failure");
    }
});
</code></pre>
 * <p>The server script would need to return an executable Javascript statement which, when processed
 * using <tt>eval()</tt> will return either a config object with an {@link Ext.Component#xtype xtype},
 * or an instantiated Component. For example:</p><pre><code>
{function() {
    function formatDate(value){
        return value ? value.dateFormat('M d, Y') : '';
    };

    var store = new Ext.data.Store({
        url: 'get-invoice-data.php',
        baseParams: {
            startDate: '01/01/2008',
            endDate: '01/31/2008'
        }
        reader: new Ext.data.JsonReader({
            record: 'transaction',
            id: 'id',
            totalRecords: 'total'
        }, [
           'customer',
           'invNo',
           {name: 'date', type: 'date', dateFormat: 'm/d/Y'},
           {name: 'value', type: 'float'}
        ])
    });

    var grid = new Ext.grid.GridPanel({
        title: 'Invoice Report',
        bbar: new Ext.PagingToolbar(store),
        store: store,
        columns: [
            {header: "Customer", width: 250, dataIndex: 'customer', sortable: true},
            {header: "Invoice Number", width: 120, dataIndex: 'invNo', sortable: true},
            {header: "Invoice Date", width: 100, dataIndex: 'date', renderer: formatDate, sortable: true},
            {header: "Value", width: 120, dataIndex: 'value', renderer: 'usMoney', sortable: true}
        ],
    });
    store.load();
    return grid;
})();
</code></pre>
 * <p>Since that code is <i>generated</i> by a server script, the <tt>baseParams</tt> for the Store
 * can be configured into the Store. The metadata to allow generation of the Record layout, and the
 * ColumnModel is also known on the server, so these can be generated into the code.</p>
 * <p>When that code fragment is passed through the <tt>eval</tt> function in the success handler
 * of the Ajax request, the code is executed by the Javascript processor, and the anonymous function
 * runs, and returns the grid.</p>
 * <p>There are several other methods available for creating TabPanels. The output of the following
 * examples should produce exactly the same appearance. The tabs can be created and rendered completely
 * in code, as in this example:</p>
 * <pre><code>
var tabs = new Ext.TabPanel({
    renderTo: Ext.getBody(),
    activeTab: 0,
    items: [{
        title: 'Tab 1',
        html: 'A simple tab'
    },{
        title: 'Tab 2',
        html: 'Another one'
    }]
});
</code></pre>
  * <p>TabPanels can also be rendered from pre-existing markup in a couple of ways.  See the {@link #autoTabs} example for
  * rendering entirely from markup that is already structured correctly as a TabPanel (a container div with
  * one or more nested tab divs with class 'x-tab'). You can also render from markup that is not strictly
  * structured by simply specifying by id which elements should be the container and the tabs. Using this method,
  * tab content can be pulled from different elements within the page by id regardless of page structure.  Note
  * that the tab divs in this example contain the class 'x-hide-display' so that they can be rendered deferred
  * without displaying outside the tabs. You could alternately set {@link #deferredRender} to false to render all
  * content tabs on page load. For example:
  * <pre><code>
var tabs = new Ext.TabPanel({
    renderTo: 'my-tabs',
    activeTab: 0,
    items:[
        {contentEl:'tab1', title:'Tab 1'},
        {contentEl:'tab2', title:'Tab 2'}
    ]
});

// Note that the tabs do not have to be nested within the container (although they can be)
&lt;div id="my-tabs">&lt;/div>
&lt;div id="tab1" class="x-hide-display">A simple tab&lt;/div>
&lt;div id="tab2" class="x-hide-display">Another one&lt;/div>
</code></pre>
 * @extends Ext.Panel
 * @constructor
 * @param {Object} config The configuration options
 */
Ext.TabPanel = Ext.extend(Ext.Panel,  {
    /**
     * @cfg {Boolean} layoutOnTabChange Set to true to do a layout of tab items as tabs are changed.
     */
    /**
     * @cfg {Boolean} monitorResize True to automatically monitor window resize events and rerender the layout on
     * browser resize (defaults to true).
     */
    monitorResize : true,
    /**
     * @cfg {Boolean} deferredRender Internally, the TabPanel uses a {@link Ext.layout.CardLayout} to manage its tabs.
     * This property will be passed on to the layout as its {@link Ext.layout.CardLayout#deferredRender} config value,
     * determining whether or not each tab is rendered only when first accessed (defaults to true).
     */
    deferredRender : true,
    /**
     * @cfg {Number} tabWidth The initial width in pixels of each new tab (defaults to 120).
     */
    tabWidth: 120,
    /**
     * @cfg {Number} minTabWidth The minimum width in pixels for each tab when {@link #resizeTabs} = true (defaults to 30).
     */
    minTabWidth: 30,
    /**
     * @cfg {Boolean} resizeTabs True to automatically resize each tab so that the tabs will completely fill the
     * tab strip (defaults to false).  Setting this to true may cause specific widths that might be set per tab to
     * be overridden in order to fit them all into view (although {@link #minTabWidth} will always be honored).
     */
    resizeTabs:false,
    /**
     * @cfg {Boolean} enableTabScroll True to enable scrolling to tabs that may be invisible due to overflowing the
     * overall TabPanel width. Only available with tabPosition:'top' (defaults to false).
     */
    enableTabScroll: false,
    /**
     * @cfg {Number} scrollIncrement The number of pixels to scroll each time a tab scroll button is pressed (defaults
     * to 100, or if {@link #resizeTabs} = true, the calculated tab width).  Only applies when {@link #enableTabScroll} = true.
     */
    scrollIncrement : 0,
    /**
     * @cfg {Number} scrollRepeatInterval Number of milliseconds between each scroll while a tab scroll button is
     * continuously pressed (defaults to 400).
     */
    scrollRepeatInterval : 400,
    /**
     * @cfg {Float} scrollDuration The number of milliseconds that each scroll animation should last (defaults to .35).
     * Only applies when {@link #animScroll} = true.
     */
    scrollDuration : .35,
    /**
     * @cfg {Boolean} animScroll True to animate tab scrolling so that hidden tabs slide smoothly into view (defaults
     * to true).  Only applies when {@link #enableTabScroll} = true.
     */
    animScroll : true,
    /**
     * @cfg {String} tabPosition The position where the tab strip should be rendered (defaults to 'top').  The only
     * other supported value is 'bottom'.  Note that tab scrolling is only supported for position 'top'.
     */
    tabPosition: 'top',
    /**
     * @cfg {String} baseCls The base CSS class applied to the panel (defaults to 'x-tab-panel').
     */
    baseCls: 'x-tab-panel',
    /**
     * @cfg {Boolean} autoTabs
     * <p>True to query the DOM for any divs with a class of 'x-tab' to be automatically converted
     * to tabs and added to this panel (defaults to false).  Note that the query will be executed within the scope of
     * the container element only (so that multiple tab panels from markup can be supported via this method).</p>
     * <p>This method is only possible when the markup is structured correctly as a container with nested
     * divs containing the class 'x-tab'. To create TabPanels without these limitations, or to pull tab content from
     * other elements on the page, see the example at the top of the class for generating tabs from markup.</p>
     * <p>There are a couple of things to note when using this method:<ul>
     * <li>When using the autoTabs config (as opposed to passing individual tab configs in the TabPanel's
     * {@link #items} collection), you must use {@link #applyTo} to correctly use the specified id as the tab container.
     * The autoTabs method <em>replaces</em> existing content with the TabPanel components.</li>
     * <li>Make sure that you set {@link #deferredRender} to false so that the content elements for each tab will be
     * rendered into the TabPanel immediately upon page load, otherwise they will not be transformed until each tab
     * is activated and will be visible outside the TabPanel.</li>
     * </ul>Example usage:</p>
     * <pre><code>
var tabs = new Ext.TabPanel({
    applyTo: 'my-tabs',
    activeTab: 0,
    deferredRender: false,
    autoTabs: true
});

// This markup will be converted to a TabPanel from the code above
&lt;div id="my-tabs">
    &lt;div class="x-tab" title="Tab 1">A simple tab&lt;/div>
    &lt;div class="x-tab" title="Tab 2">Another one&lt;/div>
&lt;/div>
</code></pre>
     */
    autoTabs : false,
    /**
     * @cfg {String} autoTabSelector The CSS selector used to search for tabs in existing markup when {@link #autoTabs}
     * = true (defaults to 'div.x-tab').  This can be any valid selector supported by {@link Ext.DomQuery#select}.
     * Note that the query will be executed within the scope of this tab panel only (so that multiple tab panels from
     * markup can be supported on a page).
     */
    autoTabSelector:'div.x-tab',
    /**
     * @cfg {String/Number} activeTab A string id or the numeric index of the tab that should be initially
     * activated on render (defaults to none).
     */
    activeTab : null,
    /**
     * @cfg {Number} tabMargin The number of pixels of space to calculate into the sizing and scrolling of tabs. If you
     * change the margin in CSS, you will need to update this value so calculations are correct with either resizeTabs
     * or scrolling tabs. (defaults to 2)
     */
    tabMargin : 2,
    /**
     * @cfg {Boolean} plain True to render the tab strip without a background container image (defaults to false).
     */
    plain: false,
    /**
     * @cfg {Number} wheelIncrement For scrolling tabs, the number of pixels to increment on mouse wheel scrolling (defaults to 20).
     */
    wheelIncrement : 20,

    /*
     * This is a protected property used when concatenating tab ids to the TabPanel id for internal uniqueness.
     * It does not generally need to be changed, but can be if external code also uses an id scheme that can
     * potentially clash with this one.
     */
    idDelimiter : '__',

    // private
    itemCls : 'x-tab-item',

    // private config overrides
    elements: 'body',
    headerAsText: false,
    frame: false,
    hideBorders:true,

    // private
    initComponent : function(){
        this.frame = false;
        Ext.TabPanel.superclass.initComponent.call(this);
        this.addEvents(
            /**
             * @event beforetabchange
             * Fires before the active tab changes. Handlers can return false to cancel the tab change.
             * @param {TabPanel} this
             * @param {Panel} newTab The tab being activated
             * @param {Panel} currentTab The current active tab
             */
            'beforetabchange',
            /**
             * @event tabchange
             * Fires after the active tab has changed.
             * @param {TabPanel} this
             * @param {Panel} tab The new active tab
             */
            'tabchange',
            /**
             * @event contextmenu
             * Fires when the original browser contextmenu event originated from a tab element.
             * @param {TabPanel} this
             * @param {Panel} tab The target tab
             * @param {EventObject} e
             */
            'contextmenu'
        );
        this.setLayout(new Ext.layout.CardLayout({
            deferredRender: this.deferredRender
        }));
        if(this.tabPosition == 'top'){
            this.elements += ',header';
            this.stripTarget = 'header';
        }else {
            this.elements += ',footer';
            this.stripTarget = 'footer';
        }
        if(!this.stack){
            this.stack = Ext.TabPanel.AccessStack();
        }
        this.initItems();
    },

    // private
    render : function(){
        Ext.TabPanel.superclass.render.apply(this, arguments);
        if(this.activeTab !== undefined){
            var item = this.activeTab;
            delete this.activeTab;
            this.setActiveTab(item);
        }
    },