[Tkinter-discuss] Listbox size

[Michael Lange]

On Tue, 13 Feb 2018 17:19:44 -0600
Bryan Oakley <bryan.oakley at gmail.com> wrote:

(...)
> Another trick would be to get the index of the item at the 0th pixel
> location of the widget (eg: the_listbox.index("@0,0"), and another at
> the pixel location for the height of the widget (ie: by using the
> result of the winfo_height method of the widget). That will tell you
> how many visible lines there are.

oh, I see now you had that idea first :) So if my snippet is of any use
for the OP, the credit goes to you!

Best regards

Michael


> 
> 
> On Tue, Feb 13, 2018 at 4:36 PM, Bob van der Poel <bob at mellowood.ca>
> wrote:
> 
> > I know how to find the number of items. Just like you show.
> >
> > No, this is not the size of the box. I have maybe 2000 entries. I can
> > set the current selection, etc with code like this:
> >
> >   self.lb.select_clear(ACTIVE)   # needed to un-hilite existing
> > selection self.lb.activate(x)                     # make new item
> > active self.lb.see(x-10)                       # force display from 10
> > previous lines
> >   self.lb.select_set(x)                 # and select the new item
> >
> > If the listbox is 20 lines high, this works perfectly. But, if it is a
> > different size, it doesn't center. In my case I don't know the size
> > of box, so the "-10" is a not-to-intelligent guess.
> >
> > Thanks.
> >
> >
> >
> > On Tue, Feb 13, 2018 at 2:49 PM, Bhaskar Chaudhary
> > <bha100710 at gmail.com> wrote:
> >
> >> Hi Bob
> >>
> >> Are you looking for the number of items in the listbox ?
> >> If yes this should give you the number of items.
> >>
> >> print(len(listbox.get(0, END)))
> >>
> >> Given that each item occupies one line in the list box, i think it
> >> the same as giving the height in lines.
> >>
> >> regards
> >> Bhaskar
> >>
> >>
> >> On 2/13/18, Bob van der Poel <bob at mellowood.ca> wrote:
> >> > Is there a way to get the current height (hopefully in lines) of a
> >> listbox?
> >> > I'd like to center, vertically, the result of a search.
> >> >
> >> > --
> >> >
> >> > **** Listen to my FREE CD at http://www.mellowood.ca/music/cedars
> >> > **** Bob van der Poel ** Wynndel, British Columbia, CANADA **
> >> > EMAIL: bob at mellowood.ca
> >> > WWW:   http://www.mellowood.ca
> >> >
> >>
> >
> >
> >
> > --
> >
> > **** Listen to my FREE CD at http://www.mellowood.ca/music/cedars ****
> > Bob van der Poel ** Wynndel, British Columbia, CANADA **
> > EMAIL: bob at mellowood.ca
> > WWW:   http://www.mellowood.ca
> >
> > _______________________________________________
> > Tkinter-discuss mailing list
> > Tkinter-discuss at python.org
> > https://mail.python.org/mailman/listinfo/tkinter-discuss
> >
> >



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