/**
 *
 *
 * 查看已选弹出层的展示面板
 * @class BI.DisplaySelectedList
 * @extends BI.Widget
 */
BI.DisplaySelectedList = BI.inherit(BI.Pane, {

    constants: {
        height: 24,
        lgap: 10
    },

    _defaultConfig: function () {
        return BI.extend(BI.DisplaySelectedList.superclass._defaultConfig.apply(this, arguments), {
            baseCls: "bi-display-list",
            itemsCreator: BI.emptyFn,
            items: []
        });
    },

    _init: function () {
        BI.DisplaySelectedList.superclass._init.apply(this, arguments);

        var self = this, opts = this.options;

        this.hasNext = false;
        var cacheItems = [];

        this.button_group = BI.createWidget({
            type: "bi.list_pane",
            element: this,
            el: {
                type: "bi.loader",
                isDefaultInit: false,
                logic: {
                    dynamic: true,
                    scrolly: true
                },
                items: this._createItems(opts.items),
                chooseType: BI.ButtonGroup.CHOOSE_TYPE_MULTI,
                layouts: [{
                    type: "bi.vertical",
                    lgap: 10
                }]
            },
            itemsCreator: function (options, callback) {
                if (options.times === 1) {
                    cacheItems = [];
                }

                if (cacheItems.length > 0) {
                    var renderedItems = cacheItems.slice(0, 100);
                    cacheItems = cacheItems.slice(100);
                    self.hasNext = true;
                    if (cacheItems.length === 0) {
                        self.hasNext = false;
                    }
                    callback(self._createItems(renderedItems));
                    return;
                }

                opts.itemsCreator(options, function (ob) {
                    self.hasNext = !!ob.hasNext;
                    var firstItemsCount = 100 + ob.items.length % 100;
                    if (ob.items.length > 100) {
                        cacheItems = ob.items.slice(100 + ob.items.length % 100);
                        self.hasNext = true;
                    }
                    callback(self._createItems(ob.items.slice(0, firstItemsCount)));
                });
            },
            hasNext: function () {
                return self.hasNext;
            }
        });
    },

    _createItems: function (items) {
        return BI.createItems(items, {
            type: "bi.icon_text_item",
            cls: "cursor-default check-font icon-size-12 display-list-item bi-tips",
            once: true,
            invalid: true,
            selected: true,
            height: this.constants.height,
            logic: {
                dynamic: true
            }
        });
    },

    empty: function () {
        this.button_group.empty();
    },

    populate: function (items) {
        if (arguments.length === 0) {
            this.button_group.populate();
        } else {
            this.button_group.populate(this._createItems(items));
        }
    }
});

BI.shortcut("bi.display_selected_list", BI.DisplaySelectedList);