linuxaudio.org

On July 26, 2010 04:50:04 am fons@kokkinizita.net wrote:

quoted text
> On Sun, Jul 25, 2010 at 04:55:10PM -0700, Niels Mayer wrote:

> > On Sun, Jul 25, 2010 at 3:23 PM,   wrote:

> > > - The analog gain sliders behave strangly. They seem to 'detent'

> > > on the scale marks, it's quite impossible to set a value *near*

> > > a scale mark while at the same time the resulotion halfway

> > > between scale marks seems to be OK.

> >

> > This is a side effect of routines I added to draw markings in the

> > scale widgets. GTK automatically auto-detents at the markings -- it's

> > certainly not what I wanted. (See volume.c: e.g.

> > draw_24bit_attenuator_scale_markings(), draw_dac_scale_markings() &

> > draw_dac_scale_markings()  called out of

> > envy24control.c:create_analog_volume()).

>

> I just don't believe that GTK can't create a slider without these

> detents (which don't work well either). It would be utterly broken.

> Try using such a fader for any real audio work.

Tested: Oh dear. I see what you guys mean now.

It's not hysteresis I was seeing, per se, but a desire for the

 slider to snap to the marker detents.

Which is caused by adding the marks to the sliders in the first place.
Possible fixes:

1) Draw the markings as a completely separate entity

    from the sliders. We don't necessarily need tick marks,

    but we get to still keep the handy page up/down snaps,

    as they are part of gtk_adjustment etc.

2) Sub-class gtk_scale, and by necessity gtk_vscale.

    I could take a stab at it. But do we want this?
I think 1) is the best attempt for now.

Let me take a look at how to draw them on their own.

They must expand when the the sliders expand, of course.

So maybe a bunch of labels inside an expanding vbox.
Tim.
_______________________________________________

Linux-audio-dev mailing list

Linux-audio-dev@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-dev