[LAD] Fwd: Re: How can an LV2 plugin UI get the value of a control port from the plugin?

Philippe Coatmeur philcm at gnu.org
Mon Oct 20 00:39:31 UTC 2014

-------- Forwarded Message --------
Subject: 	Re: [LAD] How can an LV2 plugin UI get the value of a control 
port from the plugin?
Date: 	Mon, 20 Oct 2014 01:27:10 +0100
From: 	Philippe Coatmeur <philcm at gnu.org>
Organisation: 	GNU
To: 	Harry van Haaren <harryhaaren at gmail.com>

On 17/10/14 15:56, Harry van Haaren wrote:
> On Fri, Oct 17, 2014 at 1:30 PM, Phil CM <philcm at gnu.org 
> <mailto:philcm at gnu.org>> wrote:
>     Also each time the UI is opened, the widgets are reset at maximum
>     (not the values).
> Hi Phil,
> Glad to see you're excited and working hard on learning LV2! Checkout 
> the example plugins: they show how things work.
> In the UI, there is a  port_event()  function. It tells the UI what 
> port changed, and what its current value is. Use this to do 
> widget->setValue( newValue ); and you're done ;)

For this I had to write my own

   int setValue(int value) {
     // this->scrollvalue(value);
     cout << "Called with value " << value << endl;

And it does get called by port_event() now

  * what do I put in this setValue() in order to /actually//update/ the
    widget value?

There is a int scrollvalue(int pos,int size,int first,int total); in 
Fl_Slider.H but can't call it from the class, witch is not explicitely 
extending Fl_Slider 
from what I can see... Is it?

Thanks everybody


PS - Apparently Sorcer is using AvTK on top of FLTK, I was under the 
impression that Sorcer's UI was using NTK, am I mistaking?
> Eg (from OpenAV's ArtyFX, Bitta plugin)
> https://github.com/harryhaaren/openAV-ArtyFX/blob/master/bitta/gui/ui.cxx#L131
>     How can I /get/ the control ports values from the UI perspective?
> In answer to your Q, how to "get", you don't: you're told when there's 
> a new value.
> HTH, Cheers, -Harry
> -- 
> http://www.openavproductions.com

Philippe "xaccrocheur" Coatmeur
http://bitbucket.org/xaccrocheur  /https://github.com/xaccrocheur

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxaudio.org/pipermail/linux-audio-dev/attachments/20141020/e8b50b76/attachment.html>

More information about the Linux-audio-dev mailing list