How to fit Tkinter listbox to contents

问题:

I am writing a program to run batch files for various servers and so far everything is going fine. I mean the programs works and uses a simple GUI and all is well. Apart from when I give it a slightly longer name to display in the listbox it clips the end off. The code that Tkinter uses is below.

master = tk.Tk()
listbox = tk.Listbox(master, selectmode=tk.SINGLE)

keys = serverDict.keys()
for key in sorted(keys):
    listbox.insert(tk.END, key)

button = tk.Button(master, text="Execute", command=execute)

listbox.pack()
button.pack()
tk.mainloop()

So basically it all works perfectly fine, I'm not getting any errors but it is a bit annoying the way it doesn't properly fit and I can't scroll. I know I can add scroll bars and make the window re-sizable and make the listbox fit the space it's given, but I would like it to work without having to resize stuff. I know it's not that important but it's just one of those things that I would love to work but can't figure out :/ .

回答1:

Resetting the listbox width worked for me. I used the Oblivion's answer and noticed that the width is always zero.

listbox = tk.Listbox(master, selectmode=tk.SINGLE)
listbox.config(width=0)

I also recommend to reset the root window geometry after reloading a content of the list. Otherwise if user manually extends a window the window would stop accommodate size of its content.

root.winfo_toplevel().wm_geometry("")

回答2:

This is based off of Oblivion's answer but I edited it so it worked for me.

I made a new listbox class that was based off of the original one but had a new function that I got from Oblivion's code. I then call that function and it makes the listbox an appropriate size.

class Listbox(tk.Listbox):
    def autowidth(self,maxwidth):
        f = font.Font(font=self.cget("font"))
        pixels = 0
        for item in self.get(0, "end"):
            pixels = max(pixels, f.measure(item))
        # bump listbox size until all entries fit
        pixels = pixels + 10
        width = int(self.cget("width"))
        for w in range(0, maxwidth+1, 5):
            if self.winfo_reqwidth() >= pixels:
                break
            self.config(width=width+w)

master = tk.Tk()
listbox = Listbox(master, selectmode=tk.SINGLE)

keys = serverDict.keys()
for key in sorted(keys):
    listbox.insert(tk.END, key)

button = tk.Button(master, text="Execute", command=execute)
listbox.autowidth(250)
listbox.pack()
button.pack()
tk.mainloop()

回答3:

tkListAutoWidth.py shows one way to do it:

http://svn.effbot.org/public/stuff/sandbox/tkinter/

edit:

So you might have something along the lines of,

import tkinter as tk
from tkinter import font


class NewListbox(tk.Listbox):

    def autowidth(self, maxwidth=100)
        autowidth(self, maxwidth)


def autowidth(list, maxwidth=100):
    f = font.Font(font=list.cget("font"))
    pixels = 0
    for item in list.get(0, "end"):
        pixels = max(pixels, f.measure(item))
    # bump listbox size until all entries fit
    pixels = pixels + 10
    width = int(list.cget("width"))
    for w in range(0, maxwidth+1, 5):
        if list.winfo_reqwidth() >= pixels:
            break
        list.config(width=width+w)


if __name__ == "__main__":

    master = tk.Tk()
    listbox = NewListbox(master, selectmode=tk.SINGLE)

    # ...
    # ...
    keys = serverDict.keys()
    for key in sorted(keys):
        listbox.insert("end", key)

    listbox.pack()

    button = tk.Button(master, text="Execute", command=execute)
    button.pack()

    listbox.autowidth()

    master.mainloop()

回答4:

just give width and height 0 as below

listbox.config(width=0,height=0)