Question

I have a modal dialog I’m creating with MFC. When it appears, the Aero theme does it’s fade-in transition for a new window appearing. In my particular case I’m switching immediately from one dialog to another and the fade effect is distracting. Is there a way it can be disabled so the window immediately appears, like it does when Aero is disabled, but without switching Aero off completely?

Answer 1

The DwmSetWindowAttribute function might be able to help you. It lets you modify a number of window attributes related to the DWM. In particular, the DWMWA_TRANSITIONS_FORCEDISABLED attribute mentions “Enable or forcibly disable DWM transitions”, which just might do the trick.

HRESULT hr = S_OK;
LPCVOID dwAttribute  = (LPCVOID)TRUE;

hr = DwmSetWindowAttribute(hWnd, DWMWA_TRANSITIONS_FORCEDISABLED, 
        &dwAttribute, sizeof(dwAttribute));

if (SUCCEEDED(hr))
{
   // The transitions should have been disabled
}