如何扩展 sap.m.ColumnListItem

Question

我想编写自己的 ColumnListItem 控件来添加拖放功能。

到目前为止我已经这样做了：

$.sap.require('sap.m.ColumnListItem');
$.sap.declare('my.DraggableDelegate');
$.sap.declare('my.ColumnListItem');
my.DraggableDelegate = function(oControl) {
        this.oControl = oControl;
    };
    my.DraggableDelegate.prototype = { 
        onAfterRendering: function() {
            this.oControl.$().draggable({
                cancel: false
        });
    }
};
sap.m.ColumnListItem.extend("my.ColumnListItem", {
    renderer : {}, // actually I would rather like to get the ColumnListItem renderer but I don't know how ...
    init: function() {
        this.oDraggable = new my.DraggableDelegate(this);
        this.addDelegate(this.oDraggable);                
    }
    // something is still missing here I guess
});

开发者控制台returns只有一个错误：

Uncaught TypeError: Cannot read property 'forEach' of undefined

有谁知道如何正确扩展 sap.m.ColumnListItem 控件？

Answer 1

感谢 hirse，我找到了缺失的行：

sap.m.ColumnListItem.extend("my.ColumnListItem", {
    renderer : {},
    init: function() {
        /*******/sap.m.ColumnListItem.prototype.init.apply(this); /******/
        this.oDraggable = new my.DraggableDelegate(this);
        this.addDelegate(this.oDraggable);                
    }
});