gistfile1.m

// this is the cure to fix the scrollers
- (NSView *)hitTest:(NSPoint)aPoint
{
    // CHANGE NEXT LINE TO HOW YOU CHECK FOR LION, UNLESS YOUR APP
    // ONLY WORKS ON LION THEN JUST DELETE THE IF
    // are we running lion? 
    if( ! IS_RUNNING_LION )
    {
        // if we are not, dont bother with the
        return [super hitTest:aPoint];
    }
    NSEvent * currentEvent = [NSApp currentEvent];
    
    // listen for mouse down
    if( [currentEvent type] == NSLeftMouseDown )
    {
        BOOL flag = NO;
        // if we have a vertical scroller and it accepts the current hit
        if( [self hasVerticalScroller] && [[self verticalScroller] hitTest:aPoint] != nil )
        {
            flag = YES;
            [[self verticalScroller] mouseDown:currentEvent];
        }
        // if we have a horizontal scroller and it accepts the current hit
        if( [self hasVerticalScroller] && [[self horizontalScroller] hitTest:aPoint] != nil )
        {
            flag = YES;
            [[self horizontalScroller] mouseDown:currentEvent];
        }
        // return nil only if flag is set, otherwise it will continue 
        // down the view hierarchy which is not what we want!
        if( flag )
        {
            return nil;
        }
    } else if( [currentEvent type] == NSLeftMouseUp ) {
        // if mouse up, just tell both our scrollers we have moused up
        if( [self hasVerticalScroller] )
        {
            [[self verticalScroller] mouseUp:currentEvent];
        }
        if( [self hasHorizontalScroller] )
        {
            [[self horizontalScroller] mouseUp:currentEvent];
        }
        return self;
    }
    return [super hitTest:aPoint];
}