// Same a a click on the Date Time drop down button
void IInvokeProvider.Invoke()
{
// Make sure that the control is enabled
if (!SafeNativeMethods.IsWindowEnabled(_hwnd))
{
throw new ElementNotEnabledException();
}
IntPtr hwndCalendar;
if (!WindowsDateTimePicker.IsCalendarPopupVisible(_hwnd, out hwndCalendar))
{
Misc.PostMessage(_hwnd, NativeMethods.WM_KEYDOWN, (IntPtr)NativeMethods.VK_F4, IntPtr.Zero);
Misc.PostMessage(_hwnd, NativeMethods.WM_KEYUP, (IntPtr)NativeMethods.VK_F4, IntPtr.Zero);
// Wait for the window to come up; 10 tries
for (int i = 0; i < 10 && !WindowsDateTimePicker.IsCalendarPopupVisible(_hwnd, out hwndCalendar); i++)
{
System.Threading.Thread.Sleep(0);
}
}
else
{
// A post message must be used at the processing of the WM_KEYDOWN is achieve in a PeekMessageLoop
Misc.PostMessage(hwndCalendar, NativeMethods.WM_KEYDOWN, (IntPtr)NativeMethods.VK_ESCAPE, new IntPtr(0x10001));
// Wait for the window to go away; 10 tries
for (int i = 0; i < 10 && UnsafeNativeMethods.IsWindow(hwndCalendar); i++)
{
System.Threading.Thread.Sleep(0);
}
}
}
