TkInter ScrollBar不适用于ListBox

Question

Here is my code for a ListBox and ScrollBar. The ScrollBar is showing at the right side of my frame but is disabled and not working when the items is ListBox exceeds its area:

frameLeft = Frame(self, relief = GROOVE, borderwidth = 4)
frameLeft.pack(side = LEFT, fill = Y, padx = 2, pady = 2)

scrollbar = Scrollbar(frameLeft)
scrollbar.pack(side = RIGHT, fill = Y)
lbModules = Listbox(frameLeft, relief = GROOVE, borderwidth = 2.5, yscrollcommand = scrollbar.set)
lbModules.pack(side = LEFT, fill = BOTH)
scrollbar.config(command = lbModules.yview)

for m in moduleList:
    lbModules.insert(END, Checkbutton(lbModules, text = m).pack(side = TOP, fill = X, padx = 2, pady = 2))

** moduleList is a list of strings ** Also if i add only the text to the ListBox, ScrollBar works but if i add the CheckButton, ScrollBar does not work.

Answer 1

You can only insert strings to the listbox, and the scrollbar only affects things inserted into the listbox with the .insert() method. You simply cannot insert checkbuttons into a listbox.

In your code you're attempting to pack a checkbutton into a listbox, but that's not the same as inserting a checkbox in a listbox. While you can technically pack some other widget into a listbox, it won't be "in" the listbox and won't be scrollable.

In your specific case, the reason you see nothing -- not even the checkbox names -- is because you're inserting None for each checkbutton. In python, when you do foo().bar() , the end result is the result of the last command, bar() . So, when you do Checkbutton(...).pack(...) , the result is whatever pack(...) returns, which is always None. So, lbModules.insert(Checkbutton(...).pack(...)) is the same as doing lbModules.insert(None) .