C# WinForm给ToolStrip工具栏扩展一个CheckBox单选框类型按钮的方法

[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip)]
public partial class ToolStripCheckBox : ToolStripItem
{
    private bool IsChecked = false;
 
    public bool HasChecked
    {
        get
        {
            return IsChecked;
        }
        set
        {
            IsChecked = value;
            this.Invalidate();
        }
    }
 
    public ToolStripCheckBox()
    {
        InitializeComponent();
    }
 
    public override Size GetPreferredSize(Size constrainingSize)
    {
        base.GetPreferredSize(constrainingSize);
        Size preferredSize = base.GetPreferredSize(constrainingSize);
        preferredSize.Width += 13; 
        return preferredSize;
    }
 
    protected override void OnClick(EventArgs e)
    {
        IsChecked = !IsChecked;
        base.OnClick(e);
    }
 
    protected override void OnPaint(PaintEventArgs e)
    {
        if (base.Owner != null)
        {
            Point pLocation = new Point(e.ClipRectangle.X, e.ClipRectangle.Height / 2 - (13 / 2));
            Size txtSize = TextRenderer.MeasureText(this.Text, this.Font);
            Rectangle rectText = new Rectangle(pLocation.X + 13, pLocation.Y, txtSize.Width, txtSize.Height);
            CheckBoxState chkState = IsChecked ? CheckBoxState.CheckedNormal : CheckBoxState.UncheckedNormal;
            CheckBoxRenderer.DrawCheckBox(e.Graphics, pLocation, rectText, this.Text, this.Font, false, chkState);
        }
         
    }
 
}