private void WmSysCommand(IntPtr hwnd, IntPtr wparam)
{
var scWparam = (int)wparam & 65520;
_lastScwParam = scWparam;
_lastState = WindowState;
if (scWparam == 61456)
{
NativeMethods.RedrawWindow(hwnd, IntPtr.Zero, IntPtr.Zero,
RedrawWindowFlags.Invalidate | RedrawWindowFlags.NoChildren | RedrawWindowFlags.UpdateNow |
RedrawWindowFlags.Frame);
}
if (_wasMaximized)
{
WindowStyle = WindowStyle.None;
_wasMaximized = false;
return;
}
if (scWparam == 61472 || scWparam == 61728)
{
WindowStyle = WindowStyle.SingleBorderWindow;
}
else
{
WindowStyle = WindowStyle.None;
}
if (scWparam == 61472 && WindowState == WindowState.Maximized)
{
_wasMaximized = true;
}
if ((scWparam == 61488 || scWparam == 61472 || (scWparam == 61456 || scWparam == 61440)) &&
(WindowState == WindowState.Normal && !IsAeroSnappedToMonitor(hwnd)))
{
_logicalSizeForRestore = new Rect(Left, Top, Width, Height);
}
if (scWparam == 61456 && WindowState == WindowState.Maximized && _logicalSizeForRestore == Rect.Empty)
{
_logicalSizeForRestore = new Rect(Left, Top, Width, Height);
}
if (scWparam != 61728 || WindowState == WindowState.Minimized ||
(_logicalSizeForRestore.Width <= 0.0 || _logicalSizeForRestore.Height <= 0.0))
{
return;
}
Left = _logicalSizeForRestore.Left;
Top = _logicalSizeForRestore.Top;
Width = _logicalSizeForRestore.Width;
Height = _logicalSizeForRestore.Height;
}