PropertyGrid 下拉式和弹出编辑框的实现

运行demo供大家下载#

PropertyGrid 下拉式和弹出编辑框的实现：

首先copy以下三个类

namespace WindowsFormsApp3
{
    public class hhh
    {
        private double _angle;
        [BrowsableAttribute(true)]
        [EditorAttribute(typeof(AngleEditor), typeof(System.Drawing.Design.UITypeEditor))]
        public double Angle
        {
            get
            { return _angle; }
            set
            { _angle = value; }
        }
    }

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    public class AngleEditor : System.Drawing.Design.UITypeEditor
    {
        public AngleEditor()
        {
        }
        //下拉式还是弹出式
        public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)
        {
            return UITypeEditorEditStyle.Modal;
        }

        // 为属性显示UI编辑框
        public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, object value)
        {
            //值类型不为double，直接返回value
            if (value.GetType() != typeof(double))
                return value;

            //值为double，显示下拉式或弹出编辑框
            IWindowsFormsEditorService edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
            if (edSvc != null)
            {
                // 显示编辑框并初始化编辑框的值
                AngleControl angleControl = new AngleControl((double)value);
                edSvc.ShowDialog(angleControl);
                // 返回编辑框中编辑的值.
                if (value.GetType() == typeof(double))
                    return angleControl.angle;
            }
            return value;
        }

        //下面两个函数是为了在PropertyGrid中显示一个辅助的效果
        //可以不用重写
        public override void PaintValue(System.Drawing.Design.PaintValueEventArgs e)
        {
            int normalX = (e.Bounds.Width / 2);
            int normalY = (e.Bounds.Height / 2);

            e.Graphics.FillRectangle(new SolidBrush(Color.DarkBlue), e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);
            e.Graphics.FillEllipse(new SolidBrush(Color.White), e.Bounds.X + 1, e.Bounds.Y + 1, e.Bounds.Width - 3, e.Bounds.Height - 3);
            e.Graphics.FillEllipse(new SolidBrush(Color.SlateGray), normalX + e.Bounds.X - 1, normalY + e.Bounds.Y - 1, 3, 3);

            double radians = ((double)e.Value * Math.PI) / (double)180;
            e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Red), 1), normalX + e.Bounds.X, normalY + e.Bounds.Y,
                e.Bounds.X + (normalX + (int)((double)normalX * Math.Cos(radians))),
                e.Bounds.Y + (normalY + (int)((double)normalY * Math.Sin(radians))));
        }

        public override bool GetPaintValueSupported(System.ComponentModel.ITypeDescriptorContext context)
        {
            return true;
        }
    }

    // 这里是我们要显示出来的编辑器，把它作为一个内置类
    //从UserControl继承，要在上面EditValue函数中使用的
    internal class AngleControl : System.Windows.Forms.Form
    {
        public double angle; //编辑的角度
        private float x;     //鼠标位置
        private float y;

        public AngleControl(double initial_angle)
        {
            this.angle = initial_angle;
        }
        //显现时，显示属性的当前值
        protected override void OnLoad(EventArgs e)
        {
            int originX = (this.Width / 2);
            int originY = (this.Height / 2);
            this.x = (float)(50 * Math.Cos(this.angle * Math.PI / 180) + originX);
            this.y = (float)(50 * Math.Sin(this.angle * Math.PI / 180) + originY);
            base.OnLoad(e);
        }

        //绘制控件，用来显示编辑角度
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            int originX = (this.Width / 2);
            int originY = (this.Height / 2);

            e.Graphics.DrawEllipse(Pens.Black, originX - 50, originY - 50, 100, 100);
            e.Graphics.DrawLine(Pens.Black, originX, originY, x, y);

            e.Graphics.DrawString("Angle:" + this.angle, this.Font, Brushes.Red, 0, 0);
        }
        //鼠标移动时设置角度
        protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                int originX = (this.Width / 2);
                int originY = (this.Height / 2);
                double len = Math.Sqrt(Math.Pow(e.X - originX, 2) + Math.Pow(e.Y - originY, 2));
                double h = e.Y - originY;
                this.angle = Math.Asin(h / len);
                if ((e.X >= originX && e.Y >= originY))
                {
                    this.x = (float)(50 * Math.Cos(this.angle) + originX);
                    this.y = (float)(50 * Math.Sin(this.angle) + originY);
                    this.angle = this.angle * 180 / Math.PI;
                }
                else if (e.X < originX && e.Y > originY)
                {
                    this.x = (float)(originX - 50 * Math.Cos(this.angle));
                    this.y = (float)(50 * Math.Sin(this.angle) + originY);
                    this.angle = 180 - this.angle * 180 / Math.PI;
                }
                else if (e.X < originX && e.Y < originY)
                {
                    this.x = (float)(originX - 50 * Math.Cos(this.angle));
                    this.y = (float)(originY + 50 * Math.Sin(this.angle));
                    this.angle = 180 - this.angle * 180 / Math.PI;
                }
                else if (e.X >= originX && e.Y <= originY)
                {
                    this.x = (float)(originX + 50 * Math.Cos(this.angle));
                    this.y = (float)(originY + 50 * Math.Sin(this.angle));
                    this.angle = 360 + this.angle * 180 / Math.PI;
                }
                this.Invalidate();
            }

        }

    }
}

2.新建一个form，界面上添加一个propertygrid控件。然后添加以下代码

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {

        OptionsInfo m_optInfo = new OptionsInfo();
        public Form1()
        {
            InitializeComponent();
            string extraParam = "Extra param from main form";
           
            TypeDescriptor.AddProvider(new BarTypeDescriptionProvider(typeof(Bar), extraParam), typeof(Bar));

            this.propertyGrid1.SelectedObject = new hhh();
        }
       
      
        private void button_cancel_Click(object sender, EventArgs e)
        {
        }
    
    
    }
}

弹出式效果如下：

3.下拉式只需要修改三个地方代码即可实现
修改地方如下：
（1）
（2）

（3）

效果如下