How to attach a vertical scrollbar to a Treeview using Tkinter?
Treeview is a widely used widget in Tkinter. It is a Python library that provides a variety of widgets such as Label, Entry, Button, Frame, etc. Treeview widget is used to display hierarchical data in a tabular format. However, if the number of items in the treeview is more, it becomes difficult to scroll through the list. To get rid of this problem, attaching a vertical scrollbar to the Treeview is the best solution. In this article, we will discuss how to attach a vertical scrollbar to a Treeview using Tkinter.
Prerequisites
Before working with a Treeview widget or scrollbar, you need to install the Tkinter library on your computer. To install the library, you can open the command prompt and type the following command:
pip install tkinter
After installing the library, you can start working on the Treeview widget.
Creating Treeview
To create a Treeview widget, you first need to import the ttk module from tkinter.
from tkinter import ttk
Then, you can create a Treeview widget using the ttk.Treeview() method. Here’s the code:
treeview = ttk.Treeview(parent)
treeview.pack()
You have successfully created a Treeview widget.
Adding Elements to Treeview
You can now add elements to the Treeview widget using the insert() method. Here’s the code:
treeview.insert("", "0", text="Folder 1", open=True)
treeview.insert("Folder 1", "1", text="File 1", values=("1A", "1B"))
treeview.insert("Folder 1", "2", text="File 2", values=("2A", "2B"))
treeview.insert("", "3", text="Folder 2", open=True)
treeview.insert("Folder 2", "4", text="File 3", values=("3A", "3B"))
treeview.insert("Folder 2", "5", text="File 4", values=("4A", "4B"))
Attaching Vertical Scrollbar
To attach the vertical scrollbar to the Treeview widget, you need to create a Scrollbar widget. Here’s the code:
scrollbar = ttk.Scrollbar(parent, orient="vertical", command=treeview.yview)
scrollbar.pack(side="right", fill="y")
The orient
parameter is used to specify the orientation of the scrollbar, which is vertical in this case. The command
parameter takes the Treeview’s yview() method, which is used to bind the Treeview with the scrollbar. The pack()
method is used to place the scrollbar widget on the right side of the window and take the full height of the window.
Now, bind the scrollbar with the Treeview widget using the configure()
method:
treeview.configure(yscrollcommand=scrollbar.set)
This will make the Treeview responsive to the scrolling functionality offered by the vertical scrollbar widget. Here’s the complete code to demonstrate how to attach a vertical scrollbar to a Treeview widget:
from tkinter import ttk
# Create Treeview
treeview = ttk.Treeview(parent)
treeview.pack()
# Add elements to Treeview
treeview.insert("", "0", text="Folder 1", open=True)
treeview.insert("Folder 1", "1", text="File 1", values=("1A", "1B"))
treeview.insert("Folder 1", "2", text="File 2", values=("2A", "2B"))
treeview.insert("", "3", text="Folder 2", open=True)
treeview.insert("Folder 2", "4", text="File 3", values=("3A", "3B"))
treeview.insert("Folder 2", "5", text="File 4", values=("4A", "4B"))
# Create Scrollbar
scrollbar = ttk.Scrollbar(parent, orient="vertical", command=treeview.yview)
scrollbar.pack(side="right", fill="y")
# Attach Scrollbar to Treeview
treeview.configure(yscrollcommand=scrollbar.set)
This code will show a Treeview widget along with a vertical scrollbar that can be used to scroll through the elements.
Conclusion
Attaching a vertical scrollbar to a Treeview widget in Tkinter is a great way to handle a large chunk of data. Tkinter provides many other widgets to ease the process of developing an intuitive user interface. By following this article, you can easily attach a vertical scrollbar to a Treeview widget and make it more responsive to users. Try implementing this code in your own Tkinter application and see how it works.