Command for clicking on the items of a Tkinter Treeview widget?

Question

I'm creating a GUI with Tkinter, and a major part of the GUI is two Treeview objects. I need the contents of the Treeview objects to change when an item (ie a directory) is clicked twice .

If Treeview items were buttons, I'd just be able to set command to the appropriate function. But I'm having trouble finding a way to create "on_click" behavior for Treeview items.

What Treeview option, method, etc, enables me to bind a command to particular items and execute that command "on_click" ?

Answer 1

If you want something to happen when the user double-clicks, add a binding to "<Double-1>" . Since a single click sets the selection, in your callback you can query the widget to find out what is selected. For example:

import tkinter as tk
from tkinter import ttk

class App:
    def __init__(self):
        self.root = tk.Tk()
        self.tree = ttk.Treeview()
        self.tree.pack()
        for i in range(10):
            self.tree.insert("", "end", text="Item %s" % i)
        self.tree.bind("<Double-1>", self.OnDoubleClick)
        self.root.mainloop()

    def OnDoubleClick(self, event):
        item = self.tree.selection()[0]
        print("you clicked on", self.tree.item(item,"text"))

if __name__ == "__main__":
    app = App()

Answer 2

The previous solution fails when multiple elements are selected and the user uses SHIFT+CLICK (at least on a Mac).

Here is a better solution:

import tkinter as tk
import tkinter.ttk as ttk

class App:
    def __init__(self):
        self.root = tk.Tk()
        self.tree = ttk.Treeview()
        self.tree.pack()
        for i in range(10):
            self.tree.insert("", "end", text="Item %s" % i)
        self.tree.bind("<Double-1>", self.OnDoubleClick)
        self.root.mainloop()

    def OnDoubleClick(self, event):
        item = self.tree.identify('item',event.x,event.y)
        print("you clicked on", self.tree.item(item,"text"))

if __name__ == "__main__":
    app = App()

Answer 3

I know this is old but this code will also print multiple selected item in a treeview.

def on_double_click(self, event):
    item = self.tree.selection()
    for i in item:
        print("you clicked on", self.tree.item(i, "values")[0])