[LAD] Fwd: Re: How can an LV2 plugin UI get the value of a control port from the plugin?
brummer- at web.de
Mon Oct 20 14:35:46 UTC 2014
Am 20.10.2014 13:26, schrieb Philippe Coatmeur:
> Hello Harry;
> On 20/10/14 09:07, Harry van Haaren wrote:
>> Most NTK widgets that have a "value" like a slider or a dial, derive
>> from a base class that implements value() and value( float );
>> What this means for a widget, is that in order to change the value of
>> a widget called "wid", we do this:
>> wid->value( 0.0f ); // sets widget value to 0
> Oh, I get that, believe me. The info I need is around that ; I wish
> your sentence had started earlier, like so "in port_event(), given
> /this/ class declared like /this/ and an objet wid instantiated like
> /this/, we do this (...)"
> From my port_event() I point to my UI object via the LV2UIHandle. this
> object is a NTK widget (or so I hope, read on). So if I get a:
> error: 'class KisWidget' has no member named 'value' (it's pretty
> It means the class KisWidget has no member named "value" I guess we
> can agree on that ;)
> It must be that I did not declare my Widget class as a proper NTK
> widget. The declaration is at line 25 in this file
> The instantiation of the widgets (a FL_Dial and 5 FL_Slider) is at
> line 96 in this file
> Now for the direct questions:
> * Is it a proper NTK widget class declaration, that would expose a
> value() method?
> * Are those proper NTK widget class instances?
> Thanks for your patience
I never use FLTK, but I guess that is something essential.
You need to declare your control widgets in the class KisWidget, not in
the constructor of the class.
in class KisWidget write
in the constructor Widget::Widget(void* parentXwindow) write
ReleaseButton = new Fl_Slider( 220,5,35,100,"Rel");
Then you could access the widget pointers in kis_gui.cpp like that
static void port_event(
ReleasButton is a NTK widget, not yourclass KisWidget.
(Just pseudo code here, it isn't exact syntax)
Still, I never use FLTK, I just wonder if you didn't need a
deconstructor to delete the widgets instances which have created with
"new" ( Like you need to do in GTKmm)?
Did FLTK manage the memory?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Linux-audio-dev