/**
 * @class BI.SelectTreeExpander
 * @extends BI.Widget
 */
BI.SelectTreeExpander = BI.inherit(BI.Widget, {

    _defaultConfig: function () {
        return BI.extend(BI.SelectTreeExpander.superclass._defaultConfig.apply(this, arguments), {
            baseCls: "bi-select-tree-expander",
            trigger: "click",
            toggle: true,
            direction: "bottom",
            isDefaultInit: true,
            el: {},
            popup: {}
        });
    },

    _init: function () {
        BI.SelectTreeExpander.superclass._init.apply(this, arguments);
        var self = this, o = this.options;

        this.trigger = BI.createWidget(BI.extend({stopPropagation: true}, o.el));
        this.trigger.on(BI.Controller.EVENT_CHANGE, function (type) {
            if (type === BI.Events.CLICK) {
                if (this.isSelected()) {
                    self.expander.setValue([]);
                }
            }
            self.fireEvent(BI.Controller.EVENT_CHANGE, arguments);
        });

        this.expander = BI.createWidget({
            type: "bi.expander",
            element: this,
            trigger: o.trigger,
            toggle: o.toggle,
            direction: o.direction,
            isDefaultInit: o.isDefaultInit,
            el: this.trigger,
            popup: o.popup
        });
        this.expander.on(BI.Controller.EVENT_CHANGE, function (type) {
            if (type === BI.Events.CLICK) {
                self.trigger.setSelected(false);
            }
            self.fireEvent(BI.Controller.EVENT_CHANGE, arguments);
        });
    },

    setValue: function (v) {
        if (BI.contains(v, this.trigger.getValue())) {
            this.trigger.setSelected(true);
            this.expander.setValue([]);
        } else {
            this.trigger.setSelected(false);
            this.expander.setValue(v);
        }
    },

    getValue: function () {
        if (this.trigger.isSelected()) {
            return [this.trigger.getValue()];
        }
        return this.expander.getValue();
    },

    populate: function (items) {
        this.expander.populate(items);
    }
});

BI.shortcut("bi.select_tree_expander", BI.SelectTreeExpander);