On Apr 2, 2008, at 01:25, Peter Zegelin wrote:
I have a custom view inside a scrollview and need to modify the clip view before a user begins to scroll as I have some custom rulers built into my view. Is there any way of being notified when a user is about to scroll? I tried overriding the mousedown of the scrollview but was only able to trap a mousedown in the bottom right corner, not in the scrollbars themselves.
It depends what you're trying to achieve. If the scrolling is messing up something you've drawn within the area visible through the clip view, you can tell the clip view to post bounds change notifications, then register to receive them and redraw your content on every notification (i.e. as the scrolling happens). You may need to turn off the automatic pixel copying to prevent the content from seeming to jump around.
If you really need to do something before the scrolling starts, you might reconsider your approach. It might be easier to subclass NSScrollView to lay out your custom ruler views outside the clip view by overriding the 'tile' method.
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