msdn的解釋：
The WM_NCLBUTTONDOWN message is posted when the user presses the left mouse button while the cursor is within the nonclient area of a window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
使用WM_NCLBUTTONDOWN 消息：
利用標題欄的消息，欺騙windows使得點擊客戶區可實現窗體的移動。在打擊客戶區的時候假傳消息給windows，告訴他現在左擊標題欄。
void CDragWindowDlg::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
PostMessage(WM_NCLBUTTONDOWN, HTCAPTION, MAKELPARAM(point.x, point.y));
CDialog::OnLButtonDown(nFlags, point);
}
C# 使用WM_NCLBUTTONDOWN消息實現任意位置移動窗體 public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd,
int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if ((e.Clicks == 1))
{
ReleaseCapture();
SendMessage(this.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
}
posted on 2010-03-18 10:40
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