Re: Decorating scales

["A. Walton" <awalton gnome org>]

On Tue, Jan 6, 2009 at 12:51 AM, Tristan Van Berkom <tvb gnome org> wrote:
> 2009/1/6 Matthias Clasen <matthias clasen gmail com>:
>> Over the Christmas vacation, I spent a day adding marks to scales. The
>> motivation for this came from the new sound preferences capplet, which
>> uses a GtkHScale for balance control. Jon did a nice job of adding
>> Left/Right labels (see the screenshot), but what is really missing
>> here is an easy to hit midpoint.
>>
>> So I wrote a patch for GtkRange and GtkScale that allows to add
>> 'marks' to certain values. When dragging the scale over one of these
>> marked values, there is a little resistance that makes it easy to
>> select the exact value. The api also allows to
>> show a label or icon next to the mark.
>> http://bugzilla.gnome.org/attachment.cgi?id=125318&action=view shows
>> the
>> various possibilities.
>>
>> I'd like to get this functionality into 2.16, if nobody objects, but
>> I'm not entirely sure that I have managed to come up with the best
>> possible api for this yet:
>>
>>
>> +void              gtk_scale_add_mark           (GtkScale        *scale,
>> +                                                gdouble          value,
>> +                                                GtkPositionType  position);
>> +void              gtk_scale_add_mark_text      (GtkScale        *scale,
>> +                                                gdouble          value,
>> +                                                GtkPositionType  position,
>> +                                                const gchar     *markup);
>> +void              gtk_scale_add_mark_icon      (GtkScale        *scale,
>> +                                                gdouble          value,
>> +                                                GtkPositionType  position,
>> +                                                GIcon           *icon);
>> +void              gtk_scale_clear_marks        (GtkScale *scale);
>>
>
> I wonder if the mark itself should not just be a child widget, this current api
> doesnt allow for combination of simple separator like marks with text or icons.
>
> Also it should be possible to create an icon mark without GIcon, from stock and
> icon-name (will be better suited to make it buildable).

Have to admit my own ignorance here: shouldn't it be possible to
(Gtk)Build GIcons? We currently have code in the interface for telling
them to serialize and deserialize themselves from a string, what more
is necessary?

-A. Walton

>
> Cheers,
>             -Tristan
>
> PS:
> rambling off on a semi-related topic, when I implemented a sound mixer UI -
> I wrote my own slider widget because in this case particularly it was
> a touchscreen
> interface, and we needed to make sure that we wouldnt have bursts
> (i.e. clicking
> in the trough causes a deafening slider jump), bottom line is we
> needed the slider
> in some cases to jump directly to mouse position without any steps
> (for navigating
> alphabetical content), and in other cases we didnt want the slider to
> move until
> the mouse pointer entered the slider knob area, so you could "catch"
> it with your
> finger and change the volume without bursts.
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