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 (i.e. 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()