在WinForm程式中，要移動沒有標題欄的視窗，基本的實作思路是監聽需要拖動視窗內的控制元件的滑鼠事件，然后將滑鼠位置發送給視窗進行相應的位移就可以了，通過借用Windows API也可以很容易實作這一點，比如像下面這樣，
public class Win32Api
{
public const int WM_SYSCOMMAND = 0x112;
public const int SC_DRAGMOVE = 0xF012;
[DllImport("user32.Dll", EntryPoint = "ReleaseCapture")]
public extern static void ReleaseCapture(); // 滑鼠捕獲
[DllImport("user32.Dll", EntryPoint = "SendMessage")]
public extern static void SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam); // 將訊息發送給指定的視窗
}
private void pnlHeader_MouseDown(object sender, MouseEventArgs e)
{
Win32Api.ReleaseCapture();
Win32Api.SendMessage(this.Handle, Win32Api.WM_SYSCOMMAND, Win32Api.SC_DRAGMOVE, 0);
}
當然，你還可以向這樣向視窗發送訊息，來實作拖動自定義標題欄移動視窗
public const int WM_NCLBUTTONDOWN = 0x00A1;
public const int HTCAPTION = 2;
private void pnlHeader_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
// 釋放控制元件已捕獲的滑鼠
pnlHeader.Capture = false;
// 創建并發送WM_NCLBUTTONDOWN訊息
Message msg =
Message.Create(this.Handle, Win32Api.WM_NCLBUTTONDOWN,
new IntPtr(Win32Api.HTCAPTION), IntPtr.Zero);
this.DefWndProc(ref msg);
}
}
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標籤：C#