From Newsgroup: comp.lang.python

Hi,

I would like to build a class ScrolledListbox, which can be packed somewhere in ttk.Frames. What I did is to build not really a scrolled Listbox but a Frame containing a Listbox and a Scrollbar:

class FrameScrolledListbox(ttk.Frame):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
#
# build Listbox and Scrollbar
self.Listbox = tk.Listbox(self)
self.Scrollbar = ttk.Scrollbar(self)
#
# configure these two
self.Listbox.config(yscrollcommand=self.Scrollbar.set)
self.Scrollbar.config(command=self.Listbox.yview)
#
# pack them in Frame
self.Listbox.pack(side=tk.LEFT, fill=tk.BOTH)
self.Scrollbar.pack(side=tk.RIGHT, fill=tk.BOTH)

That works, so instances of FrameScrolledListbox can be packed and the tk.Listbox itself is accessible via an attribute:

frmScrolledListbox = FrameScrolledListbox(main) frmScrolledListbox.Listbox.config(...)

But it would be a bit nicer to get a class like

class ScrolledListbox(tk.Listbox):
...

So it would be used that way:

scrolledListbox = ScrolledListbox(main)
scrolledListbox.config(...)

Is that possible? The problem which I can't handle is to handle the Frame which seems to be needed to place the Scrollbar somewhere.

Best regards
Ulrich
--
Ulrich Goebel <ml@fam-goebel.de>
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From Newsgroup: comp.lang.python

On 04Nov2024 16:32, Ulrich Goebel <ml@fam-goebel.de> wrote:

I would like to build a class ScrolledListbox, which can be packed
somewhere in ttk.Frames. What I did is to build not really a scrolled >Listbox but a Frame containing a Listbox and a Scrollbar:

That's what I would build too.

class FrameScrolledListbox(ttk.Frame):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# build Listbox and Scrollbar
self.Listbox = tk.Listbox(self)
self.Scrollbar = ttk.Scrollbar(self)

[...]

But it would be a bit nicer to get a class like

class ScrolledListbox(tk.Listbox):
...

So it would be used that way:

scrolledListbox = ScrolledListbox(main)
scrolledListbox.config(...)

Probably you want to proxy various methods to the enclosed widgets.
Possibly you want to do that with parameters in `__init__` also.

Example:

class FrameScrolledListbox(ttk.Frame):
def __init__(self, *frame_args, *, height=None, jump=None, **frame_kw):
super().__init__(*frame_args, **frame_kw)
self.Listbox = tk.Listbox(self, height=height)
self.Scrollbar = ttk.Scrollbar(self, jump=jump)
........

def config(self, *a, **kw):
return self.Listbox.config(*a, **kw)

and so forth for the various listbox methods you want to proxy to the
listbox itself. You could pass scroll specific methods to the scrollbar
as well.

Cheers,
Cameron Simpson <cs@cskk.id.au>
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From Newsgroup: comp.lang.python

On 04/11/2024 15:32, Ulrich Goebel via Python-list wrote:

I would like to build a class ScrolledListbox,

I assume like the one that used to be available via the Tix module?
It's a great shame that Tix is gone, it had a lot of these useful
widgets, but they were all wrappers around Tcl/Tk's Tix module and
that is the thing that has gone.

If you really want to replace it I'd suggest looking at the IDLE
code and see what they did because the IDLE settings dialogues
have scrolled lists and the IDLE guys have probably done a decent
job in building their widgets. (Based on the fact that IDLE has
had a tone of work done in recent years using ttk)
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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From Newsgroup: comp.lang.python

This is what I created ScrollableContainers for. Its usage deviates a bit
from standard Tkinter practices in that you add widgets to the frame
attribute of a ScrollableFrameTk instance. 

[1]twitter.abaf4b19.webp
[2]ScrollableContainers
pypi.org

For your use case, you could populate your list box and then put it inside
that frame. I’ve not tested this scenario, so I’d appreciate feedback!
Thanks. 

On 4 Nov 2024, at 21:28, Ulrich Goebel via Python-list
<python-list@python.org> wrote:

Hi,
I would like to build a class ScrolledListbox, which can be packed
somewhere in ttk.Frames. What I did is to build not really a scrolled
Listbox but a Frame containing a Listbox and a Scrollbar:
class FrameScrolledListbox(ttk.Frame):
   def __init__(self, *args, **kwargs):
       super().__init__(*args, **kwargs)
       #
       # build Listbox and Scrollbar
       self.Listbox = tk.Listbox(self)
       self.Scrollbar = ttk.Scrollbar(self)
       #
       # configure these two
       self.Listbox.config(yscrollcommand=self.Scrollbar.set)
       self.Scrollbar.config(command=self.Listbox.yview)
       #
       # pack them in Frame
       self.Listbox.pack(side=tk.LEFT, fill=tk.BOTH)
       self.Scrollbar.pack(side=tk.RIGHT, fill=tk.BOTH)
That works, so instances of FrameScrolledListbox can be packed and the
tk.Listbox itself is accessible via an attribute:
frmScrolledListbox = FrameScrolledListbox(main)
frmScrolledListbox.Listbox.config(...)
But it would be a bit nicer to get a class like
class ScrolledListbox(tk.Listbox):
   ...
So it would be used that way:
scrolledListbox = ScrolledListbox(main)
scrolledListbox.config(...)
Is that possible? The problem which I can't handle is to handle the
Frame which seems to be needed to place the Scrollbar somewhere.
Best regards
Ulrich
--
Ulrich Goebel <ml@fam-goebel.de>
--
https://mail.python.org/mailman/listinfo/python-list

References

Visible links
1. https://pypi.org/project/ScrollableContainers/
2. https://pypi.org/project/ScrollableContainers/
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