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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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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