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Re: "ghost" knobs on sliders?

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Re: "ghost" knobs on sliders?

Subject: Re: "ghost" knobs on sliders?
From: Jeff <email@hidden>
Date: Wed, 30 Mar 2005 11:57:47 -0500


On Mar 30, 2005, at 7:50 AM, Chris Stephens wrote:

When I programmatically request a dump of all the controls (the hardware device has a command to let me do this) the slider knobs fly obediently to their positions - but sometimes leave a "ghost" image of the knob in the centre position where they all were a moment before.


I've had that exact problem before.

I was writing a midi app and the issue was I was updating the UI from the midi thread, not the "main" thread.

UI updates need to be done in the main thread or you may get those ghosting effects.

There's a method in NSThread called performSelectorOnMainThread or something of that nature you can use to call a func on the main thread.

good luck

--
Jeff Trout <email@hidden>
http://www.jefftrout.com/
http://www.stuarthamm.net/

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  >"ghost" knobs on sliders? (From: Chris Stephens <email@hidden>)




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