presets, parameter value properties, tracking
presets, parameter value properties, tracking
- Subject: presets, parameter value properties, tracking
- From: Paul Davis <email@hidden>
- Date: Sat, 01 Dec 2018 17:24:34 -0500
here at ardour HQ we're trying to figure how we're supposed to do something
that we want to do: indicate to the user when the parameters of a plugin,
previously set by a preset, have been subsequently modified by the user.
the problem comes from the fact that when PresentPreset is set on a plugin,
it notifies property listeners about the change in the PresentProperty
value. Great!
but then according to apple docs and other code, we are supposed to call
AUParameterListenerNotify() with AnyParameter as the parameter ID, so that
all listeners get notified about the (potentially) new values of all the
parameters. Ardour is itself a listener.
The notifications occur in this order, so there is no way sensible to know
when the notifications that we've triggered by using AnyParameter have
finished.
This means that managing a flag that indicates "all parameters have a value
that comes from a preset" seems hard, because we don't know whether a
ParameterValueChanged notification comes from:
(1) a preset change itself (specifically, us notifying all listeners
about it)
(2) the plugin GUI being used to change a parameter on its own
(3) some other GUI (eg. host provided) being used to change a parameter
on its own
Can anyone recommend a "best practice" here, if there is one?
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