c# 实现窗体移动

浏览数：23 / 时间：2015年06月11日

一般情况下：

 1 1.添加下列代码到你的窗体中：
 2   #region 轻松移动
 3 
 4 bool isInMove;
 5   Point oldPoint;
 6 
 7   void InitializeEasyMove()
 8   {
 9    isInMove = false;
10 
11    this.MouseDown += new MouseEventHandler(EasyMove_MouseDown);
12    this.MouseUp += new MouseEventHandler(EasyMove_MouseUp);
13    this.MouseMove += new MouseEventHandler(EasyMove_MouseMove);
14   }
15 
16   void EasyMove_MouseMove(object sender, MouseEventArgs e)
17   {
18    if (!isInMove) return;
19    Point pt = PointToScreen(e.Location);
20    if (pt.X == oldPoint.X || pt.Y == oldPoint.Y) return;
21    this.Location = new Point(this.Location.X + pt.X - oldPoint.X, this.Location.Y + pt.Y - oldPoint.Y);
22    oldPoint = pt;
23   }
24 
25   void EasyMove_MouseUp(object sender, MouseEventArgs e)
26   {
27    isInMove = false;
28   }
29 
30   void EasyMove_MouseDown(object sender, MouseEventArgs e)
31   {
32    isInMove = true;
33    oldPoint = PointToScreen(e.Location);
34   }
35 
36   #endregion
37 
38 2.在你的窗体的构造函数或Load事件中调用：
39 InitializeEasyMove();

但是你会发现这样很麻烦，运行时也容易出错。

改进一：

增加mouseleave事件，当mouseleave的时候把isInMove 设置成false

这样虽然改进了一点。但是还有有点别扭

改进二：

使用win32api

 1 public partial class Form6 : Form
 2     {
 3         [DllImport("user32.dll")]
 4         public static extern bool ReleaseCapture();
 5         [DllImport("user32.dll")]
 6         public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
 7         public const int WM_SYSCOMMAND = 0x0112;
 8         public const int SC_MOVE = 0xF010;
 9         public const int HTCAPTION = 0x0002;
10         
11         public Form6()
12         {
13             InitializeComponent();
14         }
15 
16         private void Form6_MouseDown(object sender, MouseEventArgs e)
17         {
18             ReleaseCapture();
19             SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
20         }
21     }

代码量大大减少，直接消除鼠标移快速移动时出现bug的现象。但是当鼠标点击pannel，groupbox等还是没有反应

改进三：

 1 public partial class Form1 : Form
 2     {
 3         [DllImport("user32.dll")]
 4         public static extern bool ReleaseCapture();
 5         [DllImport("user32.dll")]
 6         public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
 7         public const int WM_SYSCOMMAND = 0x0112;
 8         public const int SC_MOVE = 0xF010;
 9         public const int HTCAPTION = 0x0002;
10         public Form1()
11         {
12             InitializeComponent();
13             foreach (var item in this.Controls)
14             {
15                 if ((item as GroupBox) != null)
16                 {
17                     (item as GroupBox).MouseDown += Form6_MouseDown;
18                 }
19                 else if ((item as Panel) != null)
20                 {
21                     (item as Panel).MouseDown += Form6_MouseDown;
22                 }
23             }
24         }
25 
26         private void Form6_MouseDown(object sender, MouseEventArgs e)
27         {
28             ReleaseCapture();
29             SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
30         }
31     }