[pygtk] how to change value in slider

[Neil Muller]

On Fri, Apr 3, 2009 at 7:54 PM, Sibtey Mehdi <sibteym at chetu.com> wrote:
>
> hi
>       I am trying to change the value in the slider bar but it is allowing
> to change the value within the range given in the
>       adjustment. if the current values are 1,2,4,5,6,7 then i want slider
> should show 1,2,4,8,16,32,64.how can i do this any one can help me out this
> problem? even the set_value(newvalue) function changes values within the
> lower and upper values but that changes are also not displayed on the
> slider.

Why not hook onto the format_value signal?

Something like:


class Scale(object):
    """A scale that adheres to increment steps"""
    def __init__(self,x):
        self.set_update_policy(gtk.UPDATE_CONTINUOUS)

        self.set_size_request(150,35)
        self.connect("format-value", self.display_value)

    def display_value(self, widget, value):
        return "%d" % 2**(value-1)


(You'll probably also want to override get_value so you get the
displayed value out of the widget.)

-- 
Neil Muller
drnlmuller at gmail.com

I've got a gmail account. Why haven't I become cool?