Tkinter reference: a GUI for Python |  |
Tkinter reference: a GUI for Python | |
An event is something that happens to your application—for example, the user presses a key or clicks or drags the mouse—to which the application needs to react.
The widgets normally have a lot of built-in behaviors.
For example, a button will react to a mouse click by
calling its command callback. For
another example, if you move the focus to an entry widget
and press a letter, that letter gets added to the content
of the widget.
However, the event binding capability of Tkinter allows you to add, change, or delete behaviors.
First, some definitions:
An event is some occurrence that your application needs to know about.
An event handler is a function in your application that gets called when an event occurs.
We call it binding when your application sets up an event handler that gets called when an event happens to a widget.