[pygtk] scaling in slider

[A.T.Hofkamp]

Sibtey Mehdi wrote:
> Hi all
>          i am newbie to pygtk i am trying to add the slider in my application. i want the increment shuold be like   
>         2,4,8,16, 32,64.how can i do this.  i am doing by this way but it is not working fine.
>                 x = 1
>                 adj = gtk.Adjustment(1,1, 64, 2, 2, 0)
>                 hscale = gtk.HScale(adj)
>                hscale.connect("value_changed", cb_digits_scale)
>  
>           def cb_digits_scale(hscale):
>                     x = adj.get_value()
>                    value = x*2
>                    adj.set_value(value)
> 
> can anyone suggest me?

Last year I tried to implement a logarithmic scale too, and succeeded partly.

I used a linear scale for the widget (in your case 1 .. 6), and use that value 
internally.

To get the desired output to the user of the value, I used a conversion 
function (in your case 2 << value).



What breaks here is that there seems no way to get the slider display the 
logarithmic scale rather than the linear one.
I 'fixed' this by not displaying a number at all.


Sincerely,
Albert