Thanks to all who helped me. I finally found a solution. 1. Insert the ON_WM_NCPAINT() macro into the dialog's message map, and create an overwritten OnNcPaint method. 2. In OnNcPaint, first call the derived OnNcPaint method, then get the paint DC by calling GetWindowDC(), and paint into the DC whatever you want to paint. That's it. It is a good idea to exit the function before painting if IsWindowVisible() returns false, or if IsIconic() returns true, because there is no visible title bar to paint on. If you don't want to paint over the close, minimize, etc. icons, you can retrieve their positions by calling GetTitleBarInfoEx. This function is unfortunately not defined in CWnd, so you must define it as
BOOL GetTitleBarInfoEx(HWND hWnd, PTITLEBARINFOEX pstInfo)
{
return ::SendMessage(hWnd, WM_GETTITLEBARINFOEX, 0, (LPARAM)pstInfo);
}
GetTitleBarInfoEx will return FALSE unless running Vista and up, so you must check its return value and call GetTitleBarInfo if the call to GetTitleBarInfoEx is not successful. GetTitleBarInfo is a member of CWnd :-) If you want to put a flashlight on the title bar, create a timer event which changes a flag (which indicates whether the light is on or off) and then calls RedrawWindow(NULL, NULL, RDW_FRAME | RDW_INVALIDATE);. This will post the WM_NCPAINT message. What I wrote is for CDialog derived classes. I read (but I haven't tried it) that for MDI applications, you must insert this functionality into the main frame.
modified on Friday, June 18, 2010 3:50 AM
