From: Neil Conway <nconway@...>
Date: 2001-09-30T08:39:58+09:00
Subject: [ruby-talk:21835] Re: how to position cursor in gtk entry field?

Hi,

On Sat, 2001-09-29 at 16:20, Ned Konz wrote:
> Thanks to the suggestion earlier re: validation, I was able to get this working
> (I'm using libglade and gtk+):
> 
> in initialize:
> 
>         @entryField = @glade.getWidget("item_number_entry")
>         handler = method(:item_number_changed).to_proc
>         @entryFieldHandlerId = @entryField.signal_connect("insert_text", &handler)
> 
> then:
> 
>     def item_number_changed(e, t, n)
>         newText = t.gsub(/\D/, '')

I think using String#tr would be faster.

>         if newText.length > 0
>             begin
>                 e.signal_handler_block(@entryFieldHandlerId)
>                 e.insert_text(newText, n)
>                 # what to do here to move the cursor?
>             ensure
>                 e.signal_handler_unblock(@entryFieldHandlerId)
>             end
>         end
>         e.signal_emit_stop("insert_text")
>     end

Right, that should work -- although it's not the best solution. I'll
think about the solution you suggested and see if I can implement
something.

> Which does the validation/filtering just fine.
> But when it inserts the text, the cursor stays at the same place.
> I've tried position=, set_position, and set_selection; none of the three seemed to work.

set_position should work -- it's been implemented, and it's just a thin
wrapper over the GTK+ function gtk_entry_set_position(int). In
Ruby-GNOME 0.26, it will instead call gtk_editable_set_position(int),
but the behavior should be the same.

If you're having problems, can you post the code you're using and the
error you get?

Cheers,

Neil