static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);
/// <summary>
/// Get the min/max window size for this window
/// Correctly accounting for the taskbar size and position
/// </summary>
/// <param name="hwnd"></param>
/// <param name="lParam"></param>
private void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
{
// Get the point position to determine what screen we are on
POINT lMousePosition;
GetCursorPos(out lMousePosition);
// Get the primary monitor at cursor position 0,0
var lPrimaryScreen = MonitorFromPoint(new POINT(0, 0), MonitorOptions.MONITOR_DEFAULTTOPRIMARY);
// Try and get the primary screen information
var lPrimaryScreenInfo = new MONITORINFO();
if (GetMonitorInfo(lPrimaryScreen, lPrimaryScreenInfo) == false)
{
return;
}
// Now get the current screen
var lCurrentScreen = MonitorFromPoint(lMousePosition, MonitorOptions.MONITOR_DEFAULTTONEAREST);
// If this has changed from the last one, update the transform
if (lCurrentScreen != _mLastScreen || _mTransformToDevice == default(Matrix))
{
GetTransform();
}
// Store last know screen
_mLastScreen = lCurrentScreen;
// Get min/max structure to fill with information
var lMmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));
// If it is the primary screen, use the rcWork variable
if (lPrimaryScreen.Equals(lCurrentScreen) == true)
{
lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcWork.Left;
lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcWork.Top;
lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcWork.Right - lPrimaryScreenInfo.rcWork.Left;
lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcWork.Bottom - lPrimaryScreenInfo.rcWork.Top;
}
// Otherwise it's the rcMonitor values
else
{
lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcMonitor.Left;
lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcMonitor.Top;
lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcMonitor.Right - lPrimaryScreenInfo.rcMonitor.Left;
lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcMonitor.Bottom - lPrimaryScreenInfo.rcMonitor.Top;
}
// Set min size
var minSize = _mTransformToDevice.Transform(new Point(_mWindow.MinWidth, _mWindow.MinHeight));
lMmi.ptMinTrackSize.X = (int)minSize.X;
lMmi.ptMinTrackSize.Y = (int)minSize.Y;
// Store new size
_mScreenSize = new Rect(lMmi.ptMaxPosition.X, lMmi.ptMaxPosition.Y, lMmi.ptMaxSize.X, lMmi.ptMaxSize.Y);
// Now we have the max size, allow the host to tweak as needed
Marshal.StructureToPtr(lMmi, lParam, true);
}