RoundButton.cs

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using Newtonsoft.Json.Linq;
using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
namespace Mind
{
    public interface MindNode
    {
        Point leftPoint { get; set; }
        Point rightPoint { get; set; }
        bool isRootTopic { get; set; }
         JObject Jref { get; set; }
    }
    public interface NodeTextBox
    {
        void btnTextBox_KeyDown(object sender, KeyEventArgs e);
        Font myFont { get; set; }
    }
    public enum ControlState { Hover, Normal, Pressed }
    public class RoundButton : Button, MindNode, NodeTextBox
    {
        private int radius;//半径 
        public TextBox btnTextBox = new TextBox();
        public Color _baseColor = Color.FromArgb(51, 161, 224);//基颜色
        private Color _hoverColor = Color.FromArgb(51, 0, 224);//基颜色
        private Color _normalColor = Color.FromArgb(0, 161, 224);//基颜色
        private Color _pressedColor = Color.FromArgb(51, 161, 0);//基颜色
        //圆形按钮的半径属性
        [CategoryAttribute("布局"), BrowsableAttribute(true), ReadOnlyAttribute(false)]
        public int Radius
        {
            set
            {
                radius = value;
                this.Invalidate();
            }
            get
            {
                return radius;
            }
        }
        [DefaultValue(typeof(Color), "51, 161, 224")]
        public Color NormalColor
        {
            get
            {
                return this._normalColor;
            }
            set
            {
                this._normalColor = value;
                this.Invalidate();
            }
        }
        //  [DefaultValue(typeof(Color), "220, 80, 80")]
        public Color HoverColor
        {
            get