Re: Please Help me

[Gus Koppel <gtk spamkiller bytechase cx>]

mohammad alam wrote:

> I am trying to make an interface which uses Spin button widget using
> GTK 1.2. I need to increment the range value nonlinearly. For example
> , the lower value is 1 and upper  valude is 10000. But i want to
> increment upto 500 with increment step size 10 and for the left value
> i want to increment with step size 5 for the same widget. How can I
> use the Gtk Adjustment arguments for this purpose ? 

Strange step size intentions. Hopefully you're not going to confuse the
users of your application too much. Nevertheless, I have two
suggestions. Both work as handlers for the "value_changed" signal of
your GtkSpinButton. Roughly, they are:

1.
    const gint ss_list[] = {500, 10, 10000, 5, 0};
    gint list_idx = -1;
    gint new_ss;
    gint curr_value = gtk_spin_button_get_value_as_int (
            your_spin_button);
    while ((ss_list [++list_idx]) &&
            curr_value <= ss_list [list_idx]) {
        new_ss = ss_list [++list_idx];
    }
    gtk_spin_button_set_increments (your_spin_button,
            (gdouble) new_ss, 0);

2.
    gtk_spin_button_set_increments (your_spin_button,
            (gdouble) max (1,
            gtk_spin_button_get_value_as_int (
                your_spinbutton) / 50 + 0), 0);

The first way is able to produce exactly the (weird) step sizes you
requested. It uses a mixed array of upper value limits and corresponding
step sizes. You can easily extend it, for instance, to set step
sizes to 20 for values <100 or step sizes of 2 for values of 2500 -
10000. just always conclude the list with a 0 and keep the boundary
values in ascending order.

The second way works arithmetical to continously change step sizes while
the value changes. This doesn't provide exactly the behaviour you were
asking for but a behaviour which may be found more useful by the users?
Change the "50" and "+ 0" in the 2nd example to vary the change ratio.

Notes:
- approaches (function names) base on GTK 2.x. Don't know for 1.2.x.
- I didn't care much about types and casts in the above examples.
- I didn't care about the second (page) value in ..._set_increments ().
- I didn't test it.

PS: Maybe you should be a bit more precise on your subject line?