/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * 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.
     */

    /**
     * @cfg {Number/String} forceGlyph
     * The charCode 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 override
     * the default behavior of changing the button's icon to match the selected item's icon
     * on change. This property expects a format consistent with that of {@link #glyph}
     */
    /**
     * @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;
                me.glyph = item.glyph;
            } else {
                me.setText(me.getButtonText(item));
                me.setIconCls(item.iconCls);
                me.setGlyph(item.glyph);
            }
            me.activeItem = item;
            if (!item.checked) {
                item.setChecked(true, false);
            }
            if (me.forceIcon) {
                me.setIconCls(me.forceIcon);
            }
            if (me.forceGlyph) {
                me.setGlyph(me.forceGlyph);
            }
            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);
    }
});