protected override void WndProc(ref Message m)
{
int WM_NCCALCSIZE = 0x83;
int WM_NCHITTEST = 0x84;
IntPtr result = default(IntPtr);
int dwmHandled = Dwm.DwmDefWindowProc(m.HWnd, m.Msg, m.WParam, m.LParam, ref result);
if (dwmHandled == 1)
{
m.Result = result;
return;
}
if (m.Msg == WM_NCCALCSIZE && m.WParam.ToInt32() == 1)
{
WinApi.NCCALCSIZE_PARAMS nccsp = (WinApi.NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(WinApi.NCCALCSIZE_PARAMS));
if (!_marginOk)
{
//Set what client area would be for passing to DwmExtendIntoClientArea. Also remember that at least one of these values NEEDS TO BE > 1, else it won't work.
dwmMargins.cyTopHeight = 1;
dwmMargins.cxLeftWidth = 1;
dwmMargins.cyBottomHeight = 1;
dwmMargins.cxRightWidth = 1;
_marginOk = true;
}
Marshal.StructureToPtr(nccsp, m.LParam, false);
m.Result = IntPtr.Zero;
}
else if (m.Msg == WM_NCHITTEST && m.Result.ToInt32() == 0)
{
m.Result = HitTestNCA(m.HWnd, m.WParam, m.LParam);
}
else
{
base.WndProc(ref m);
}
}
private void Form1_Activated(object sender, EventArgs e)
{
Dwm.DwmExtendFrameIntoClientArea(this.Handle, ref dwmMargins);
}
