protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
{
UnsafeNativeMethods.GetSystemMenu(Handle, true);
IntPtr hSysMenu = UnsafeNativeMethods.GetSystemMenu(Handle, false);
if (hSysMenu != IntPtr.Zero)
{
if (AdditionalSysMenus != null)
{
int entryno = SC_ADDITIONALMENU;
foreach (string t in AdditionalSysMenus)
{
UnsafeNativeMethods.AppendMenu(hSysMenu, MF.STRING, entryno++, t);
}
}
UnsafeNativeMethods.AppendMenu(hSysMenu, MF.SEPARATOR, 0, string.Empty);
UnsafeNativeMethods.AppendMenu(hSysMenu, MF.STRING, SC_ONTOP, "On &Top");
IntPtr hOpacSubmenu = UnsafeNativeMethods.CreateMenu();
if (hOpacSubmenu != IntPtr.Zero)
{
for (int i = 10; i > 0; i--)
{
UnsafeNativeMethods.AppendMenu(hOpacSubmenu, MF.STRING, SC_OPACITYSUBMENU + i, $"{i / 10f:P0}");
}
UnsafeNativeMethods.AppendMenu(hSysMenu, MF.STRING | MF.POPUP, (int)hOpacSubmenu, "&Opacity");
}
}
}
}
