    /**
     * 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 */

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

        /**
         * 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);
                }
            }
        },

        /**
         * 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(
                /**
                 * @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
                 */
                "change"
            );

            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 "items" 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 < 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 && me.showText) {
                me.addCls(Ext.baseCSSPrefix + 'cycle-fixed-width');
            }
        },

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

        /**
         * 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);
        }
    });