Custom Window Class for View Window

Often I have been coding away and realized that to get exactly the behavior I would like I would need to change the Window class for my View window. Upon looking into the Developer Studio help file, and perusing the help to AfxRegisterClass, I'd realize that this could be a bit more work than one would originally think. The most recent time I went to do this I came across Zafir Anjum's example "Titletip for individual cells" in the ListView section of this code repository. Looking at what he had done for his custom window classes I realized that if I could get the class info for the default window class of the MFC View class, it would be trivial to change the settings of said class and reregister it under a new name. This is what I came up with.
#define CUSTOM_CLASSNAME _T("YourCustomClassName")

BOOL CMyView::PreCreateWindow(CREATESTRUCT& cs)
{

   // modify window styles and such here
   cs.style |= (WS_CLIPCHILDREN | WS_CLIPSIBLINGS);          
 
   // call base class PreCreateWindow to get the cs.lpszClass filled in with the MFC default class name
   if( !CView::PreCreateWindow(cs) )
     return 0;

   // Register the window class if it has not already been registered.
   
   WNDCLASS wndcls;
   HINSTANCE hInst = AfxGetInstanceHandle();

   if(!(::GetClassInfo(hInst, CUSTOM_CLASSNAME, &wndcls)))      // check if our class is registered
   {
     if(::GetClassInfo(hInst, cs.lpszClass, &wndcls))           // get default MFC class settings 
     {
	wndcls.lpszClassName = CUSTOM_CLASSNAME;                // set our class name

	wndcls.style |= CS_OWNDC;			        // change settings for your custom class
        wndcls.hbrBackground = NULL;

        if (!AfxRegisterClass(&wndcls))                         // register class
          AfxThrowResourceException();				// could not register class
     }
     else
       AfxThrowResourceException();				// default MFC class not registered
    }

    cs.lpszClass = CUSTOMVIEWCLASSNAME;                         // set our class name in CREATESTRUCT

    return 1;                                                   // we're all set
}

Date Posted: 6/24/98
Posted by: Pat Laplante.