/**
+ * @class Ext.CycleButton
+ * @extends Ext.SplitButton
+ * 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:
+ *
+ * @constructor
+ * Create a new split button
+ * @param {Object} config The config object
+ * @xtype cycle
+ */
+Ext.CycleButton = Ext.extend(Ext.SplitButton, {
+ /**
+ * @cfg {Array} 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'})
+ */
+ /**
+ * @cfg {Boolean} showText True to display the active item's text as the button text (defaults to false)
+ */
+ /**
+ * @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, defaults to '')
+ */
+ /**
+ * @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 menu
+ * @type Menu
+ * The {@link Ext.menu.Menu Menu} object used to display the {@link Ext.menu.CheckItem CheckItems} representing the available choices.
+ */
+
+ // private
+ getItemText : function(item){
+ if(item && this.showText === true){
+ var text = '';
+ if(this.prependText){
+ text += this.prependText;
+ }
+ text += item.text;
+ return text;
+ }
+ return undefined;
+ },
+
+ /**
+ * Sets the button's active menu item.
+ * @param {Ext.menu.CheckItem} item The item to activate
+ * @param {Boolean} suppressEvent True to prevent the button's change event from firing (defaults to false)
+ */
+ setActiveItem : function(item, suppressEvent){
+ if(typeof item != 'object'){
+ item = this.menu.items.get(item);
+ }
+ if(item){
+ if(!this.rendered){
+ this.text = this.getItemText(item);
+ this.iconCls = item.iconCls;
+ }else{
+ var t = this.getItemText(item);
+ if(t){
+ this.setText(t);
+ }
+ this.setIconClass(item.iconCls);
+ }
+ this.activeItem = item;
+ if(!item.checked){
+ item.setChecked(true, true);
+ }
+ if(this.forceIcon){
+ this.setIconClass(this.forceIcon);
+ }
+ if(!suppressEvent){
+ this.fireEvent('change', this, item);
+ }
+ }
+ },
+
+ /**
+ * Gets the currently active menu item.
+ * @return {Ext.menu.CheckItem} The active item
+ */
+ getActiveItem : function(){
+ return this.activeItem;
+ },
+
+ // private
+ initComponent : function(){
+ this.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.CycleButton} this
+ * @param {Ext.menu.CheckItem} item The menu item that was selected
+ */
+ "change"
+ );
+
+ if(this.changeHandler){
+ this.on('change', this.changeHandler, this.scope||this);
+ delete this.changeHandler;
+ }
+
+ this.itemCount = this.items.length;
+
+ this.menu = {cls:'x-cycle-menu', items:[]};
+ var checked;
+ for(var i = 0, len = this.itemCount; i < len; i++){
+ var item = this.items[i];
+ item.group = item.group || this.id;
+ item.itemIndex = i;
+ item.checkHandler = this.checkHandler;
+ item.scope = this;
+ item.checked = item.checked || false;
+ this.menu.items.push(item);
+ if(item.checked){
+ checked = item;
+ }
+ }
+ this.setActiveItem(checked, true);
+ Ext.CycleButton.superclass.initComponent.call(this);
+
+ this.on('click', this.toggleSelected, this);
+ },
+
+ // 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(){
+ this.menu.render();
+
+ var nextIdx, checkItem;
+ for (var i = 1; i < this.itemCount; i++) {
+ nextIdx = (this.activeItem.itemIndex + i) % this.itemCount;
+ // check the potential item
+ checkItem = this.menu.items.itemAt(nextIdx);
+ // if its not disabled then check it.
+ if (!checkItem.disabled) {
+ checkItem.setChecked(true);
+ break;
+ }
+ }
+ }
+});
+Ext.reg('cycle', Ext.CycleButton);