Farpoint Spread 单元格中嵌入下拉多选框

Farpoint Spread 控件自带了很多类型的单元格(日期,数字,下拉列表等等),可是没有一个控件支持多选,效果如下图

为了现实以上效果,其间也想了不少办法,重绘继承单元格,最后效果都不理想,

最后,通过网上的资料,知道还有一种手段,那就是在单元格里面嵌入自定义控件,这个自定义控件还 必须继承IEmbeddedControlSupport(命名空间FarPoint.Win.Spread.DrawingSpace)接口,并实现接口方法

主要代码如下:

 public partial class SpreadComboCheckBoxList : ComboCheckBoxList, IEmbeddedControlSupport
    {
        public SpreadComboCheckBoxList()
        {
            InitializeComponent();
        }

        public void ControlPaint(Graphics g, Rectangle r, Appearance appearance, object value, bool isSelected, bool isLocked,
            float zoomFactor)
        {
            appearance.ShowActive = true;
            appearance.DrawPrimaryButton = true;
            g.SetClip(r, CombineMode.Intersect);
        }

        private Moving _moving = Moving.None;
        private Sizing _sizing = Sizing.None;
        private const ChildActivationPolicy Activation = ChildActivationPolicy.Click;

        public virtual ChildActivationPolicy ActivationPolicy
        {
            get
            {
                return Activation;
            }
            set
            {
            }
        }
        public virtual Moving CanMove
        {
            get
            {
                return _moving;
            }
            set
            {
                _moving = value;
            }
        }
        public virtual Sizing CanSize
        {
            get
            {
                return _sizing;
            }
            set
            {
                _sizing = value;
            }
        }
    }

最后在FpSpread中加入这个控件

//实例化自定义控件
var spComboCheckBox = new SpreadComboCheckBoxList
                        {
                            Name = cell.Row.Index + "_" + cell.Column.Index + "_" + "SpreadComboCheckBoxList"
                        };
//将自定义控件加入指定位置的单元格
FpSpread.Sheets[0].AddControl(spComboCheckBox,cell.Row.Index, cell.Column.Index);