Tkinter GUI Application Development Blueprints, Second Edition - Second Edition

Event patterns

In the previous example, you learned how to use the <Button-1> event to denote a left-click. This is a built-in pattern in Tkinter that maps it to a left-click event. Tkinter has an exhaustive mapping scheme that perfectly identifies events such as this one.

Here are some examples to give you an idea of event patterns:

The event pattern	The associated event
<Button-1>	Left-click of the mouse
<KeyPress-B>	A keyboard press of the B key
<Alt-Control-KeyPress- KP_Delete>	A keyboard press of Alt + Ctrl + Del

In general, the mapping pattern takes the following form:

<[event modifier-]...event type [-event detail]>

Typically, an event pattern will comprise the following:

• An event type: Some common event ...