protected static void ShowWindowMenu(HwndSource source, Point screenPoint, bool canMinimize)
{
var systemMetrics = NativeMethods.GetSystemMetrics(40);
var systemMenu = NativeMethods.GetSystemMenu(source.Handle, false);
var windowPlacement = NativeMethods.GetWindowPlacement(source.Handle);
var flag = VisualUtilities.ModifyStyle(source.Handle, 268435456, 0);
var uEnable = canMinimize ? 0U : 1U;
if (windowPlacement.showCmd == 1)
{
NativeMethods.EnableMenuItem(systemMenu, 61728U, 1U);
NativeMethods.EnableMenuItem(systemMenu, 61456U, 0U);
NativeMethods.EnableMenuItem(systemMenu, 61440U, 0U);
NativeMethods.EnableMenuItem(systemMenu, 61488U, 0U);
NativeMethods.EnableMenuItem(systemMenu, 61472U, uEnable);
NativeMethods.EnableMenuItem(systemMenu, 61536U, 0U);
}
else if (windowPlacement.showCmd == 3)
{
NativeMethods.EnableMenuItem(systemMenu, 61728U, 0U);
NativeMethods.EnableMenuItem(systemMenu, 61456U, 1U);
NativeMethods.EnableMenuItem(systemMenu, 61440U, 1U);
NativeMethods.EnableMenuItem(systemMenu, 61488U, 1U);
NativeMethods.EnableMenuItem(systemMenu, 61472U, uEnable);
NativeMethods.EnableMenuItem(systemMenu, 61536U, 0U);
}
if (flag)
{
VisualUtilities.ModifyStyle(source.Handle, 0, 268435456);
}
var fuFlags = (uint)(systemMetrics | 256 | 128 | 2);
var num = NativeMethods.TrackPopupMenuEx(systemMenu, fuFlags, (int)screenPoint.X, (int)screenPoint.Y,
source.Handle, IntPtr.Zero);
if (num == 0)
{
return;
}
NativeMethods.PostMessage(source.Handle, 274, new IntPtr(num), IntPtr.Zero);
}