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Generating Scrolling Text
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Generating Scrolling Text


  • Subject: Generating Scrolling Text
  • From: Philip Dow <email@hidden>
  • Date: Tue, 20 Dec 2005 22:52:01 +0100

I'm looking to generate some scrolling text in a view. No scroll bars are involved. Rather, I'd like to begin the text at the bottom of the view and scroll it upwards, eventually fading it out at the top and restarting when finished. Basically what you see in the iTunes about box.

What's the best way to do this? I'm thinking of using a custom nsview. I would render my attributed string into an instance variable nsimage either at init or some other point prior to drawing. A timer would fire calling a method to change the dimensions of a rect which I would then use as the source rect for compositing the image in the view's drawInRect method. The sounds pretty good to me, but I don't know if it's the best or most efficient way. Is there a better?

Plus, just to be sure, I should be able to draw my attributed string into the image as long as I lock focus on it, right?

-Phil
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