30 Jun
2005
30 Jun
'05
8:20 a.m.
Alfons Adriaensen wrote:
On Wed, Jun 29, 2005 at 10:46:55AM -0400, Paul Coccoli
wrote:
>On 6/28/05, Olivier Guilyardi <ml(a)xung.org> wrote:
>
>
>>I believe there could exist a library with which :
>>1 - you instantiate a core object (providing the alsa midi port as an arg)
>>2 - you "attach" to some widgets : sliders, spin buttons, etc.. (note
that this
>>is different from extending (bloating) widgets)
>>3 - you may call a function to enter the capture-mode
>>4 - 100 % of this capture-mode is encapsulated by the library : knobs-to-widgets
>>assignations are handled transparently
>>5 - there is some way to retrieve these assignations to recall them later
>>
>
>You seem to really like this idea. Why don't you just do it and see
>if it works well? I have an unfounded hunch that it won't, since you
>usually want your GUI running in a lower priority thread.
Needs checking indeed... Spawning an additionnal thread may be required. The
reason why I don't "just do it" is because discussing implementations ideas
before coding has been of great benefit to me in the past, especially here in
LAD...
Yes, and you'd force the widgets to update for
each message sent by
a knob, even if there are 1000 such messages per second, which is absurd
and could easily freeze the entire application.
Why ? I can cache/compare values before asking the widget to update.
It's also not a general model. What if you want to
link to GUIs, or
two HW controllers ?
Two controllers (mtk: midi toolkit) :
c1 = midibind_new();
c2 = midibind_new();
That would open two input midi ports (and maybe create two threads).
Then you could attach to whatever widget you like :
mtk_attach_gtk_hscale (c1, gui1->hscale);
mtk_attach_gtk_vscale (c2, gui1->vscale);
mtk_attach_gtk_hscale (c2, gui2->hscale);
...
The association should be done in the 'server'
part of the model, i.e.
that part which provides the interface to all controllers and viewers.
In the MVC structure, a GUI is just a controller/viewer as any other.
It does not play any central role.
I know what you mean. But I tend to keep my distances with such academic
considerations.
Thanks for your input and criticism.
--
og