[LV2] Widget-less UI not working
ventosus at airpost.net
Sat Jun 4 12:48:57 PDT 2016
On 04.06.2016 04:22, Stefan Riha wrote:
> I should have added that the ui:UI with the additions you suggested works well with jalv -s, but only if I remove the
> kx:Window option from the *ttl, so that jalv doesn't see it at all.
jalv (and many other hosts) just take the first supported UI.
'jalv -s' is kind of broken by that it'll take the first UI it finds no matter whether it is a ui:showInterface or not.
The first here usually means 'first in alphabetical order'.
<http://example.org/yassy#kx> thus comes before <http://example.org/yassy#ui>.
That's why I prefix UI URIs with numbers :-)
> On Sat, Jun 4, 2016 at 12:16 PM, Stefan Riha <hoitaus at gmail.com <mailto:hoitaus at gmail.com>> wrote:
> Yes, that helped, it works much better now. I tried your "customui.lv2" and it works flawlessly.
> I structured the *ttl's of my project like yours, and using kx in Ardour works. But I still get an error with jalv
> (with -s). It always wants to use the kx:Widget, even though kx is listed as a required feature. Maybe a typo, I'll
> figure it out next week.
> The ttl's I use are:
> I used to have the ui in a separate bundle (that's why the projects are different), but I install the
> files now all to the same .lv2/yassy.lv2 have the exact same *ttl structure as customui.lv2.
> On Sat, May 28, 2016 at 7:26 PM, Stefan Riha <hoitaus at gmail.com <mailto:hoitaus at gmail.com>> wrote:
> Thanks, that's a lot of valuable information. Much appreciated.
> Yes makes sense, the x11 quirk is not good.
> Can't wait to try it next week.
> On May 28, 2016 19:10, "Hanspeter Portner" <ventosus at airpost.net <mailto:ventosus at airpost.net>> wrote:
> On 28.05.2016 01:27, Stefan Riha wrote:
> > I had time now to try it. I'm not sure if I understood this correctly, but ui:idleInterface and
> ui:showInterface don't
> > seem to solve my problem. Jalv and Ardour don't even call extension_data(). They break before that, due to
> the invalid
> > widget pointer they get from calling instantiate().
> Ah, I forgot to tell that not all hosts support ui:showInterface, yet. e.g. Ardour does not.
> And jalv needs to be called with a special (undocumented) flag (-s), to run in the proper state.
> Although ui:showInterface is the 'official' extension to do custom UIs, some hosts only support its deprecated
> predecessor extension 'external-ui' .
> 'external-ui' and ui:showInterface/ui:idleInterface are pretty similar and you can actually wrap one into the
> other to support both within the same code .
>  http://kxstudio.linuxaudio.org/ns/lv2ext/external-ui
>  https://github.com/ventosus/customui.lv2
> Have a look at , it should get you going, it runs fine in jalv(1.4.6), Ardour(4.7), Qtractor (0.7.5)
> Run your host from the console to see whether it works for you (the UI prints some debug strings to stdout)
> $ jalv -s http://open-music-kontrollers.ch/lv2/customui#test
> > However, I noticed that if I declare the widget-less UI as a ui:X11UI in the .ttl, then it works! Jalv,
> Ardour and
> > Qtractor open an empty window, call extension_data() with ui:idleInterface. I actually think that's all I
> need. Probably
> > has something to do with the pointer type for X11 windows (see http://lv2plug.in/ns/extensions/ui/#X11UI )
> No, that's not what you need. ui:idleInterface can be used apart from ui:showInterface. It's readily used with
> ui:X11UI to drive animations, screen updates, etc. as X11 has no main loop as e.g. Gtk and Qt.
> If your plugin does not create an XWindow, don't declare it as ui:X11UI, if your plugin does not create a
> don't declare it as ui:GtkUI, ...
> You're just being lucky here. Hosts expect an ui:X11UI to return an XWindow ID. The latter is just a plain
> Whathever you return as a widget XWindow ID (or whathever resided in memory at that time) may just happen to
> already exist in your Xwindow environment. Some hosts may not even check the retured value for validity, either.
> > On Sat, May 21, 2016 at 5:08 PM, Hanspeter Portner <ventosus at airpost.net <mailto:ventosus at airpost.net>
> <mailto:ventosus at airpost.net <mailto:ventosus at airpost.net>>> wrote:
> > On 21.05.2016 06:23, Stefan Riha wrote:
> > > Hi, I'm a beginner and experimenting with lv2.
> > Great
> > > I wrote a simply synth and want a UI without Widget. On the lv2 page it says
> > >
> > > "There is no requirement that a UI actually be a graphical widget."
> > > (from: http://lv2plug.in/ns/extensions/ui/ ).
> > True, an UI can theoretically be anything.
> > Can you give some more information on what you want to accomplish? You may well not need an UI in the
> first place (but
> > don't know yet, as you are a beginner).
> > > Below that, there is a list of subclasses of UI, but all are for widgets. So I thought I'd try ui:UI
> directly instead of
> > > ui:GtkUI etc. But neither jalv nor Ardour recognises that there is a UI.
> > ui:UI is the parent class which the Widget UIs (ui:GtkUI, ui:Gtk3UI, ui:QtUI, ...) derive from. It is
> en empty shell
> > really, hosts cannot possibly know what is inside, you have to give the host some more information.
> > > So I used ui:GtkUI instead. In jalv, this yields error messages of type Gtk-CRITICAL. Obviously it's
> because there is no
> > > actual widget. In Ardour, I can see that the UI is instantiated() and immediately cleanedup(),
> probably because the Gtk
> > > errors are handled that way.
> > If you define the UI as an ui:GtkUI, but do not return a valid GtkWidget to the host, sure this raises
> an error.
> > > How do you do this?
> > >
> > > I looked for hours for some example code but couldn't find one. I stumbled across Ingen which has
> some form of
> > > web-interface (if I understood correctly) and tried to read the .ttl files, but don't understand them.
> > You may be looking for ui:showInterface  and ui:idleInterface , with those you can build arbitrary
> > UIs.
> > Here  you can find a dummy plugin I use for testing various UIs in my humble host.
> > <test_show.c> implements an as-simple-as-it-gets no-widget UI.
> >  http://lv2plug.in/ns/extensions/ui/#showInterface
> >  http://lv2plug.in/ns/extensions/ui/#idleInterface
> >  https://github.com/ventosus/alluis.lv2
> > > Thanks a lot for your help,
> > > Stefan
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