/// <summary>
/// This is the hook to HwndSource that is called when window messages related to
/// this window occur.
/// </summary>
/// <param name="hwnd"></param>
/// <param name="msg"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <param name="handled"></param>
/// <returns></returns>
private IntPtr WindowFilterMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
IntPtr retInt = IntPtr.Zero;
WindowMessage message = (WindowMessage)msg;
//
// we need to process WM_GETMINMAXINFO before _swh is assigned to
// b/c we want to store the max/min size allowed by win32 for the hwnd
// which is later used in GetWindowMinMax. WmGetMinMaxInfo can handle
// _swh == null case.
switch (message)
{
case WindowMessage.WM_APP:
AddHandle(WinUser.GetForegroundWindow());
break;
}
return(retInt);
}
