Tkinter GUI Application Development Blueprints, Second Edition - Second Edition

Binding levels

In the previous section, you had a look at how to bind an event to an instance of a widget. This can be called an instance-level binding.

However, there may be times when you need to bind events to an entire application. At times, you may want to bind an event to a particular class of widget. Tkinter provides the following levels of binding options for this:

• Application-level binding: Application-level bindings let you use the same binding across all windows and widgets of an application as long as any one window of the application is in focus. The syntax for application-level bindings is as follows:

widget.bind_all(event, callback, add=None)

The typical usage pattern is as follows:

root.bind_all('<F1>', show_help)

Application-level ...