private static void HandleNcCalcSize(IntPtr hwnd, IntPtr wParam, IntPtr lParam)
{
if (wParam == BasicValues.TRUE)
{
var wpl = default(WINDOWPLACEMENT);
wpl.length = (uint)Marshal.SizeOf(typeof(WINDOWPLACEMENT));
if (User32.GetWindowPlacement(hwnd, ref wpl))
{
// detect if maximizd and set to workspace remove padding
if (wpl.showCmd == ShowWindowOption.SW_MAXIMIZE)
{
// in multi-monitor case where app is minimized to a monitor on the right/bottom
// the MonitorFromWindow will incorrectly return the leftmost monitor due to the minimized
// window being set to the far left, so this routine now uses the proposed rect to correctly
// identify the real nearest monitor to calc the nc size.
NCCALCSIZE_PARAMS para = (NCCALCSIZE_PARAMS)Marshal.PtrToStructure(lParam, typeof(NCCALCSIZE_PARAMS));
var windowRect = para.rectProposed;
IntPtr hMonitor = User32.MonitorFromRect(ref windowRect, MonitorOption.MONITOR_DEFAULTTONEAREST);// MonitorFromWindow(hWnd, 2);
if (hMonitor != IntPtr.Zero)
{
MONITORINFO lpmi = new MONITORINFO();
lpmi.cbSize = (uint)Marshal.SizeOf(typeof(MONITORINFO));
if (User32.GetMonitorInfo(hMonitor, ref lpmi))
{
var workArea = lpmi.rcWork;
User32.AdjustForAutoHideTaskbar(hMonitor, ref workArea);
Debug.WriteLine($@"NCCalc original = {para.rectProposed}, new ={workArea}");
para.rectProposed = workArea;
Marshal.StructureToPtr(para, lParam, true);
}
}
}
}
}
}
