Re: [gtk-list] "Endpoint" behavior of GtkVScale

[Owen Taylor <otaylor redhat com>]

Jeremy Weatherford <xidus@xidus.net> writes:

> Hello,
> 
> I recently started using GTK, and have since built a mostly-complete
> application with it quite easily.  I'm very happy with it, and I hope to
> be able to contribute back to the project through documentation, if not
> code.
> 
> I have some doubts about whether GtkVScale is working as well as it could
> be at the moment, though.  When the 'thumb' is dragged all the way to the
> top, the Adjustment reads the maximum (or minimum) value.  When it's
> dragged all the way to the bottom, though, the Adjustment often does not
> reach its minimum (or maximum) value.  I understand that this is because
> of rounding, but I'm not sure this is the best behavior.
> 
> Especially when the scale is used to represent a value, the user
> frequently (depending on the exact size and range of the scale and
> and adjustment) cannot select the minimum value.  In my case, this is
> especially problematic since I have a GtkVScale being used as a volume
> control.  At the top, it reads 0, but at the bottom it'll read 98 or
> something similar, meaning in my case that a given channel can't have its
> volume turned all the way off.

The range of a range (scale/scrollbar) widget is

 lower <= value <= upper - page_size

This is what you expect for a scrollbar, but perhaps a bit suprising
for a scale; try setting the page_size for the scale to zero.

Regards,
                                        Owen