Quickies for NSScrollView

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General

• Responding to a scrollview scrolling [permalink]
  If you need to react to a scrollview being scrolled by the user, first tell the contentView (the NSClipView) to post notifications when its bounds changes, and then register to receive an NSViewBoundsDidChangeNotification:

      [[scrollView contentView] setPostsBoundsChangedNotifications: YES];
  
      NSNotificationCenter *center = [NSNotificationCenter defaultCenter] ;
      [center addObserver: self
              selector: @selector(boundsDidChangeNotification:)
              name: NSViewBoundsDidChangeNotification
              object: [scrollView contentView]];
  ...
  
  - (void) boundsDidChangeNotification: (NSNotification *) notification
  {
      [self setNeedsDisplay: YES];
      // or whatever work you need to do
  
  } // boundsDidChangeNotification
  

• Scrolling an NSScrollView programatically [permalink]
  Sometimes you need to scroll a scrollview outside of user control. You first have to tell the content view (Which is an NSClipView) to scroll to a point, and then tell the scrollview to adjust its scrollbar position:

      [[scrollView contentView] scrollToPoint: pointToScrollTo];
      [scrollView reflectScrolledClipView: [scrollView contentView]];
  

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