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Re: Audio Unit Presets and undo
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Re: Audio Unit Presets and undo


  • Subject: Re: Audio Unit Presets and undo
  • From: Bjorn Roche <email@hidden>
  • Date: Thu, 7 Jun 2007 18:30:20 -0400

On Jun 7, 2007, at 11:27 AM, Bjorn Roche wrote:

Hey all,

I am restructuring my code a bit to support native Audio Unit GUIs and running into trouble with Presets, parameter list changes and undo. Previously, when a parameter list or preset changed event was fired, I always knew it was in response to something I did, so I did not have to create a new edit object. Now that I'm adding support for native GUIs, those events may be fired in response to something I did, or in response to something the user did, like select a new preset or changed a parameter in the native UI. This means I must have some way to distinguish my events from UI triggered events so that I can create an edit for UI triggered events (otherwise undo won't work). Here's what I've tried:

when I restore a preset:

set flag
restore preset
unset flag

when responding to an event:

if flag is set
   return
else
   create an edit

but this doesn't work because, as far as I can tell, an extra event gets fired later, after the flag is unset, meaning I'm unable to distinguish between events that I initiated programatically and events that were initiated by the UI. So, am I doing something wrong to cause the extra event to fire? Is there some other strategy I can use? I'm aware that I can listen to gesture begin and gesture end events for parameters, but this is for properties.

I *think* I have the situation straightened out with preset changes, because I can compare the changes against what I have in my data- structures. However, when the parameter list changes (for example, by changing the number of bands in apple's graphic EQ), I seem to get multiple parameter changed events and the parameter list is different each time, so as far as my app can tell each is a separate event. Since I can't find anything about this on the list it makes me think something is wrong with my code to cause all those extra events.... but maybe someone else knows more?


	bjorn

-----------------------------
Bjorn Roche
XO Wave
Digital Audio Production and Post-Production Software
http://www.xowave.com
http://blog.bjornroche.com
http://myspace.com/xowave


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References: 
 >Audio Unit Presets and undo (From: Bjorn Roche <email@hidden>)

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