- /**
- * <p>Extends one class to create a subclass and optionally overrides members with the passed literal. This method
- * also adds the function "override()" to the subclass that can be used to override members of the class.</p>
- * For example, to create a subclass of Ext GridPanel:
- * <pre><code>
-MyGridPanel = Ext.extend(Ext.grid.GridPanel, {
- constructor: function(config) {
-
-// Create configuration for this Grid.
- var store = new Ext.data.Store({...});
- var colModel = new Ext.grid.ColumnModel({...});
-
-// Create a new config object containing our computed properties
-// *plus* whatever was in the config parameter.
- config = Ext.apply({
- store: store,
- colModel: colModel
- }, config);
-
- MyGridPanel.superclass.constructor.call(this, config);
-
-// Your postprocessing here
- },
-
- yourMethod: function() {
- // etc.
- }
-});
-</code></pre>
- *
- * <p>This function also supports a 3-argument call in which the subclass's constructor is
- * passed as an argument. In this form, the parameters are as follows:</p>
- * <div class="mdetail-params"><ul>
- * <li><code>subclass</code> : Function <div class="sub-desc">The subclass constructor.</div></li>
- * <li><code>superclass</code> : Function <div class="sub-desc">The constructor of class being extended</div></li>
- * <li><code>overrides</code> : Object <div class="sub-desc">A literal with members which are copied into the subclass's
- * prototype, and are therefore shared among all instances of the new class.</div></li>
- * </ul></div>
- *
- * @param {Function} superclass The constructor of class being extended.
- * @param {Object} overrides <p>A literal with members which are copied into the subclass's
- * prototype, and are therefore shared between all instances of the new class.</p>
- * <p>This may contain a special member named <tt><b>constructor</b></tt>. This is used
- * to define the constructor of the new class, and is returned. If this property is
- * <i>not</i> specified, a constructor is generated and returned which just calls the
- * superclass's constructor passing on its parameters.</p>
- * <p><b>It is essential that you call the superclass constructor in any provided constructor. See example code.</b></p>
- * @return {Function} The subclass constructor from the <code>overrides</code> parameter, or a generated one if not provided.
- */