iOS VM and useScrollingView

 
I have been digging into the iOS VM a tad further.

Now, I wonder, what it the scrollview for? I isn't used by default I guess.

BOOL useScrollingView = [self.info useScrollingView];

        // PBK what's the scrolling view here?
        if (useScrollingView) {
                scrollView = [[UIScrollView alloc ] initWithFrame: mainScreenSize];

                //Now setup the true view size as the width/height * 2.0  so we can
have a larger squeak window and zoom in/out.
                CGRect fakeScreenSize = mainScreenSize;
                fakeScreenSize.origin.x = 0;
                fakeScreenSize.origin.y = 0;
                fakeScreenSize.size.width *= 2.0;
                fakeScreenSize.size.height *= 2.0;
                /* eToys setup
                 fakeScreenSize.size.width = 1200;
                 fakeScreenSize.size.height = 900;
                */
                mainView = [[[self whatRenderCanWeUse] alloc] initWithFrame: fakeScreenSize];
                mainView.backgroundColor = [UIColor blackColor];
                mainView.multipleTouchEnabled = YES;
                mainView.autoresizingMask = UIViewAutoresizingNone;
                self.mainView.clearsContextBeforeDrawing = NO;
               
                //Setup the scroll view which wraps the mainView
                self.scrollView.scrollEnabled = useScrollingView;
                self.scrollView.clearsContextBeforeDrawing = NO;
                self.scrollView.canCancelContentTouches = NO;
                self.scrollView.minimumZoomScale = 0.5;
                self.scrollView.maximumZoomScale = 4.0;
                self.scrollView.delegate = self;
                self.scrollView.backgroundColor = [UIColor blackColor];
                self.scrollView.autoresizesSubviews=YES;
                self.scrollView.autoresizingMask=(UIViewAutoresizingFlexibleHeight |
UIViewAutoresizingFlexibleWidth);

                self.viewController.view = self.scrollView;
               
                [self zoomToOrientation: UIInterfaceOrientationPortrait animated: NO];
                [self.scrollView addSubview: self.mainView];
                [window addSubview: self.scrollView];
               
        }