protected override void WndProc(ref Message m)
{
IntPtr result = IntPtr.Zero;
bool callDWP = !Win32Interop.DwmDefWindowProc(m.HWnd, m.Msg, m.WParam, m.LParam, out result);
switch (m.Msg)
{
case Win32Messages.WM_CREATE:
{
RECT rc;
int style = Win32Interop.GetWindowLong(m.HWnd, Win32Constants.GWL_STYLE);
int styleEx = Win32Interop.GetWindowLong(m.HWnd, Win32Constants.GWL_EXSTYLE);
Win32Interop.AdjustWindowRectEx(out rc, style, false, styleEx);
//BorderTop = Math.Abs(rc.top);
//BorderLeft = Math.Abs(rc.left);
BorderRight = Math.Abs(rc.right);
BorderBottom = Math.Abs(rc.bottom);
}
break;
case Win32Messages.WM_ACTIVATE:
{
MARGINS margins = new MARGINS();
margins.cxLeftWidth = Math.Abs(BorderLeft);
margins.cxRightWidth = Math.Abs(BorderRight);
margins.cyBottomHeight = Math.Abs(BorderBottom);
margins.cyTopHeight = Math.Abs(BorderTop);
int hr = Win32Interop.DwmExtendFrameIntoClientArea(m.HWnd, ref margins);
result = IntPtr.Zero;
}
break;
case Win32Messages.WM_NCCALCSIZE:
{
if (m.WParam != IntPtr.Zero)
{
result = IntPtr.Zero;
callDWP = false;
}
}
break;
case Win32Messages.WM_NCHITTEST:
{
int ht = NCHitText(m);
callDWP = (ht == Win32Constants.HTNOWHERE);
result = new IntPtr(ht);
}
break;
}
m.Result = result;
if (callDWP)
{
base.WndProc(ref m);
}
}
public static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);