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  1. using System;
  2. using System.Collections.Generic;
  3. using System.ComponentModel;
  4. using System.Data;
  5. using System.Drawing;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows.Forms;
  9.  
  10. namespace WindowsFormsApplication1
  11. {
  12.     class DdBotton : Button
  13.     {
  14.         public DdBotton()
  15.         {
  16.             this.MouseDown += new MouseEventHandler(DdBotton_MouseDown);
  17.             this.MouseUp += new MouseEventHandler(DdBotton_MouseUp);
  18.             this.MouseMove += new MouseEventHandler(DdBotton_MouseMove);
  19.         }
  20.         Point MousePoint;
  21.         void DdBotton_MouseMove(object sender, MouseEventArgs e)
  22.         {
  23.             if ((e.Button & MouseButtons.Left) == MouseButtons.Left)
  24.             {
  25.                 if (this.MousePoint != Point.Empty)
  26.                 {
  27.                     this.Left += e.X - this.MousePoint.X;
  28.                     this.Top += e.Y - this.MousePoint.Y;
  29.                 }
  30.             }
  31.         }
  32.  
  33.         void DdBotton_MouseUp(object sender, MouseEventArgs e)
  34.         {
  35.             this.MousePoint = Point.Empty;
  36.         }
  37.  
  38.         void DdBotton_MouseDown(object sender, MouseEventArgs e)
  39.         {
  40.             if((e.Button & MouseButtons.Left) == MouseButtons.Left)
  41.             {
  42.                 if (this.MousePoint == Point.Empty)
  43.                 {
  44.                     this.MousePoint = new Point(e.X, e.Y);
  45.                 }
  46.             }
  47.         }
  48.     }
  49. }
  50.  
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https://ideone.com/FXxjR
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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