BOOL CXTPDrawHelpers::ProcessPendingPaintMessages(HWND hWnd /*= NULL*/)

{

BOOL bResult = TRUE;

MSG msg;

while (::PeekMessage(&msg, hWnd, WM_PAINT, WM_PAINT, PM_NOREMOVE)

|| ::PeekMessage(&msg, hWnd, WM_ERASEBKGND, WM_ERASEBKGND, PM_NOREMOVE)

|| ::PeekMessage(&msg, hWnd, WM_SYNCPAINT, WM_SYNCPAINT, PM_NOREMOVE)

|| ::PeekMessage(&msg, hWnd, WM_NCPAINT, WM_NCPAINT, PM_NOREMOVE))

{

if (WM_QUIT != msg.message)

{

if (::PeekMessage(&msg, hWnd, msg.message, msg.message, PM_REMOVE))

{

if (WM_QUIT != msg.message) // WM_QUIT should never happen here but still extra verification won't harm

{

::DispatchMessage(&msg);

// This ensures the window won't enter the second painting cycle.

// ::ValidateRect(msg.hwnd, NULL);

}

else

{

// Re-post WM_QUIT as it's been removed.

::PostQuitMessage(static_cast<int>(msg.wParam));

bResult = FALSE;

break;

}

}

}

else

{

bResult = FALSE;

break;

}

}

return bResult;

}