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  <pre class="prettyprint lang-js"><span id='Ext-button-Cycle'>/**
</span> * A specialized SplitButton that contains a menu of {@link Ext.menu.CheckItem} elements. The button automatically
 * cycles through each menu item on click, raising the button's {@link #change} event (or calling the button's
 * {@link #changeHandler} function, if supplied) for the active menu item. Clicking on the arrow section of the
 * button displays the dropdown menu just like a normal SplitButton.  Example usage:
 *
 *     @example
 *     Ext.create('Ext.button.Cycle', {
 *         showText: true,
 *         prependText: 'View as ',
 *         renderTo: Ext.getBody(),
 *         menu: {
 *             id: 'view-type-menu',
 *             items: [{
 *                 text: 'text only',
 *                 iconCls: 'view-text',
 *                 checked: true
 *             },{
 *                 text: 'HTML',
 *                 iconCls: 'view-html'
 *             }]
 *         },
 *         changeHandler: function(cycleBtn, activeItem) {
 *             Ext.Msg.alert('Change View', activeItem.text);
 *         }
 *     });
 */
Ext.define('Ext.button.Cycle', {

    /* Begin Definitions */

    alias: 'widget.cycle',

    extend: 'Ext.button.Split',
    alternateClassName: 'Ext.CycleButton',

    /* End Definitions */

<span id='Ext-button-Cycle-cfg-items'>    /**
</span>     * @cfg {Object[]} items
     * An array of {@link Ext.menu.CheckItem} **config** objects to be used when creating the button's menu items (e.g.,
     * `{text:'Foo', iconCls:'foo-icon'}`)
     * 
     * @deprecated 4.0 Use the {@link #cfg-menu} config instead. All menu items will be created as
     * {@link Ext.menu.CheckItem CheckItems}.
     */
<span id='Ext-button-Cycle-cfg-showText'>    /**
</span>     * @cfg {Boolean} [showText=false]
     * True to display the active item's text as the button text. The Button will show its
     * configured {@link #text} if this config is omitted.
     */
<span id='Ext-button-Cycle-cfg-prependText'>    /**
</span>     * @cfg {String} [prependText='']
     * A static string to prepend before the active item's text when displayed as the button's text (only applies when
     * showText = true).
     */
<span id='Ext-button-Cycle-cfg-changeHandler'>    /**
</span>     * @cfg {Function} changeHandler
     * A callback function that will be invoked each time the active menu item in the button's menu has changed. If this
     * callback is not supplied, the SplitButton will instead fire the {@link #change} event on active item change. The
     * changeHandler function will be called with the following argument list: (SplitButton this, Ext.menu.CheckItem
     * item)
     */
<span id='Ext-button-Cycle-cfg-forceIcon'>    /**
</span>     * @cfg {String} forceIcon
     * A css class which sets an image to be used as the static icon for this button. This icon will always be displayed
     * regardless of which item is selected in the dropdown list. This overrides the default behavior of changing the
     * button's icon to match the selected item's icon on change.
     */
<span id='Ext-button-Cycle-property-menu'>    /**
</span>     * @property {Ext.menu.Menu} menu
     * The {@link Ext.menu.Menu Menu} object used to display the {@link Ext.menu.CheckItem CheckItems} representing the
     * available choices.
     */

    // private
    getButtonText: function(item) {
        var me = this,
            text = '';

        if (item &amp;&amp; me.showText === true) {
            if (me.prependText) {
                text += me.prependText;
            }
            text += item.text;
            return text;
        }
        return me.text;
    },

<span id='Ext-button-Cycle-method-setActiveItem'>    /**
</span>     * Sets the button's active menu item.
     * @param {Ext.menu.CheckItem} item The item to activate
     * @param {Boolean} [suppressEvent=false] True to prevent the button's change event from firing.
     */
    setActiveItem: function(item, suppressEvent) {
        var me = this;

        if (!Ext.isObject(item)) {
            item = me.menu.getComponent(item);
        }
        if (item) {
            if (!me.rendered) {
                me.text = me.getButtonText(item);
                me.iconCls = item.iconCls;
            } else {
                me.setText(me.getButtonText(item));
                me.setIconCls(item.iconCls);
            }
            me.activeItem = item;
            if (!item.checked) {
                item.setChecked(true, false);
            }
            if (me.forceIcon) {
                me.setIconCls(me.forceIcon);
            }
            if (!suppressEvent) {
                me.fireEvent('change', me, item);
            }
        }
    },

<span id='Ext-button-Cycle-method-getActiveItem'>    /**
</span>     * Gets the currently active menu item.
     * @return {Ext.menu.CheckItem} The active item
     */
    getActiveItem: function() {
        return this.activeItem;
    },

    // private
    initComponent: function() {
        var me      = this,
            checked = 0,
            items,
            i, iLen, item;

        me.addEvents(
<span id='Ext-button-Cycle-event-change'>            /**
</span>             * @event change
             * Fires after the button's active menu item has changed. Note that if a {@link #changeHandler} function is
             * set on this CycleButton, it will be called instead on active item change and this change event will not
             * be fired.
             * @param {Ext.button.Cycle} this
             * @param {Ext.menu.CheckItem} item The menu item that was selected
             */
            &quot;change&quot;
        );

        if (me.changeHandler) {
            me.on('change', me.changeHandler, me.scope || me);
            delete me.changeHandler;
        }

        // Allow them to specify a menu config which is a standard Button config.
        // Remove direct use of &quot;items&quot; in 5.0.
        items = (me.menu.items || []).concat(me.items || []);
        me.menu = Ext.applyIf({
            cls: Ext.baseCSSPrefix + 'cycle-menu',
            items: []
        }, me.menu);

        iLen = items.length;

        // Convert all items to CheckItems
        for (i = 0; i &lt; iLen; i++) {
            item = items[i];

            item = Ext.applyIf({
                group        : me.id,
                itemIndex    : i,
                checkHandler : me.checkHandler,
                scope        : me,
                checked      : item.checked || false
            }, item);

            me.menu.items.push(item);

            if (item.checked) {
                checked = i;
            }
        }

        me.itemCount = me.menu.items.length;
        me.callParent(arguments);
        me.on('click', me.toggleSelected, me);
        me.setActiveItem(checked, me);

        // If configured with a fixed width, the cycling will center a different child item's text each click. Prevent this.
        if (me.width &amp;&amp; me.showText) {
            me.addCls(Ext.baseCSSPrefix + 'cycle-fixed-width');
        }
    },

    // private
    checkHandler: function(item, pressed) {
        if (pressed) {
            this.setActiveItem(item);
        }
    },

<span id='Ext-button-Cycle-method-toggleSelected'>    /**
</span>     * This is normally called internally on button click, but can be called externally to advance the button's active
     * item programmatically to the next one in the menu. If the current item is the last one in the menu the active
     * item will be set to the first item in the menu.
     */
    toggleSelected: function() {
        var me = this,
            m = me.menu,
            checkItem;

        checkItem = me.activeItem.next(':not([disabled])') || m.items.getAt(0);
        checkItem.setChecked(true);
    }
});</pre>
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