Python and Tkinter, carry list info from one function to another

Question

I am working on a project. I set a toplevel, a listbox and textbox on the toplevel. I want to have a function that is called when I click on one of the elements of the list, and then I want to get the index of the selected element, and update the textbox. Any ideas?

This is the code I have, but it doesn't do what I want it to do:

def helpInitialize():
    help = Toplevel()
    help.title("Help")
    help.geometry("1000x650")
    help.resizable(0,0)

    helpFiles= []

    listy = Scrollbar(help)
    listy.place(x=143, y=20, height=565)

    listHelp = Listbox(help, height=35, width=20)
    listHelp.place(x=20, y=20)
    listHelp.config(yscrollcommand=listy.set)
    listy.config(command=listHelp.yview)

    texty = Scrollbar(help)
    texty.place(x= 977, y= 20, height = 565)
    textx = Scrollbar(help,orient= HORIZONTAL)
    textx.place(x = 175, y= 583, width = 800)

    helpText = Text(help, bg="white", height=35, width=100)
    helpText.place(x=175, y=20)
    helpText.configure(state="disabled")
    helpText.config(yscrollcommand=texty.set, xscrollcommand=textx.set)
    texty.config(command=helpText.yview)
    textx.config(command=helpText.xview)

    listHelp.bind("<Button-1>", theFunction)

def theFunction(event):
    print(listHelp.get(listHelp.curselection()))

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stovfl
– stovfl

2020-01-22 20:08:53 +00:00
Commented Jan 22, 2020 at 20:08 — stovfl
– stovfl, Commented Jan 22, 2020 at 20:08

acw1668 · Accepted Answer · 2020-01-23 01:50:57Z

1

In your case, you can use lambda to pass the Listbox and Text widgets to the function:

listHelp.bind('<Button-1>', lambda e: theFunction(e.widget, helpText))

Modify theFunction():

def theFunction(listbox, textbox):
    index = listbox.curselection()[0]
    value = listbox.get(index)
    textbox.insert(tk.END, str(value)+'\n')
    textbox.see(tk.END)

answered Jan 23, 2020 at 1:50

acw1668

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Comments

Axe319 · Accepted Answer · 2020-01-22 19:31:28Z

Typically, I'll put my tkinter objects into a class. It makes it much easier to share objects between functions. Here is an example of how that could be achieved with the sample code you provided.

from tkinter import Toplevel, Scrollbar, Listbox, Text, HORIZONTAL, END

class Help:
    def __init__(self):
        self.help = Toplevel()
        self.help.title("Help")
        self.help.geometry("1000x650")
        self.help.resizable(0,0)

        self.helpFiles = ['Test ' + str(i) for i in range(100)]

        self.listy = Scrollbar(self.help)
        self.listy.place(x=143, y=20, height=565)

        self.listHelp = Listbox(self.help, height=35, width=20)
        self.listHelp.place(x=20, y=20)
        self.listHelp.config(yscrollcommand=self.listy.set)
        self.listy.config(command=self.listHelp.yview)

        for item in self.helpFiles:
            self.listHelp.insert(END, item)

        self.texty = Scrollbar(self.help)
        self.texty.place(x= 977, y= 20, height = 565)
        self.textx = Scrollbar(self.help, orient= HORIZONTAL)
        self.textx.place(x = 175, y= 583, width = 800)

        self.helpText = Text(self.help, bg="white", height=35, width=100)
        self.helpText.place(x=175, y=20)
        self.helpText.configure(state="disabled")
        self.helpText.config(yscrollcommand=self.texty.set, xscrollcommand=self.textx.set)
        self.texty.config(command=self.helpText.yview)
        self.textx.config(command=self.helpText.xview)

        self.listHelp.bind("<<ListboxSelect>>", self.theFunction)

    def theFunction(self, event):
        print(self.listHelp.get(self.listHelp.curselection()))
        # your code here

if __name__ == '__main__':
    test = Help()
    test.help.mainloop()

Additionally I changed your function binding from <Button-1> to <<ListboxSelect>>. I believe that one has the functionality you desired.

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