有人可以向我解释拖动无边界框架的简单程序吗?

问题描述

private const int HT_CAPTION = 0x2;   // what does this means
private const int WM_NCLBUTTONDOWN = 0x00A1;    // what does this means

[DllImport("user32", CharSet = CharSet.Auto)]
private static extern bool ReleaseCapture();       // what does this means

[DllImport("user32", CharSet = CharSet.Auto)]  // what does this means
private static extern int SendMessage(        // what does this means
    IntPtr hwnd,
    int wMsg,
    int wParam,
    int lParam);

protected override void OnMouseDown(MouseEventArgs e)// what does this means
{
    base.OnMouseDown(e);
    if (e.Button == MouseButtons.Left)
    {

                Rectangle rct = DisplayRectangle;
                if (
                    rct.Contains(e.Location))
                {
                    ReleaseCapture(); SendMessage(panel1.Parent.Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
                }
            }
}     }

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