C # mobile forms and controls

In the winform program, sometimes we need to move controls in the form without a title bar or in the form, and use several events such as mouse clicks, movement, and coordinate calculation to complete this function, however, an API function has been found recently, which can be easily and conveniently completed. As follows:

Code [DllImportAttribute ("user32.dll")]
Private extern static bool ReleaseCapture ();
[DllImportAttribute ("user32.dll")]
Private extern static int SendMessage (IntPtr handle, int m, int p, int h );

 

When using these two functions, import using System. Runtime. InteropServices;

Use:

ReleaseCapture ();
SendMessage (this. Handle, 0xA1, 0x2, 0 );

This parameter does not need to be changed except the this. Handle parameter. For example, we define a MouseDown event for the form:

This. MouseDown + = new MouseEventHandler (MyBaseControl_MouseDown );

Then you can drag the form at any point. The Event code is as follows:

Code 1 protected void MyBaseControl_MouseDown (object sender, MouseEventArgs e)
2 {
3 if (e. Button = MouseButtons. Left)
4 {
5 this. Cursor = Cursors. SizeAll;
6 ReleaseCapture ();
7 SendMessage (this. Handle, 0xA1, 0x2, 0 );
8 this. Cursor = Cursors. Default;
9}
10}
11

 

If a control is used for running, you can put the above Code into the MouseDown event of the control, only in SendMessage (this. Handle, 0xA1, 0x2, 0 );

This. Handle parameter should be changed to the Handle of this control, such as this. button1.Handle.