7/31/2023 0 Comments Tkinter treeview example![]() Some part of the widget or application is visible after having been covered up by another window. The mouse pointer is moved into a visible part of a widget. The state option of a widget changes from active to inactive. The state option of a widget changes from inactive to active. The following table shows the most commonly used event types: Type For example, the event pattern applies to the keypress of any key. This modifier makes an event type general. The following table lists the most commonly used event modifiers: Event Modifier The following section shows the most commonly used event modifiers, event types, and event details. and represents a keypress of Alt + Ctrl + Delete. Inside the angle brackets, there are zero or more modifiers, an event type, and detailed information about the event.įor example, the denotes a keyboard press of the key A. In this syntax, an event is surrounded by angle brackets ( ). The following shows the general syntax of an event pattern: Code language: HTML, XML ( xml ) For example, the denotes the Return key pressed. ![]() ![]() Tkinter uses event patterns to map event names with handlers. If you don’t specify the add='+' argument, the bind() method will replace the existing handler ( return_pressed) by the new one ( log). In this statement, the third argument add='+' registered additional handler, which is the log() function. The following binds the log() function to the Return key pressed event of the 'Save' button: btn.bind( '', log, add= '+') Code language: Python ( python ) When you move the focus to the button and press the Return key, Tkinter automatically invokes the return_pressed and log functions. The following example illustrates how to use the bind() method to register multiple handlers for the same event: import tkinter as tk In this example, the following statement calls the bind() method on the button widget to bind the Return key pressed event: btn.bind(' ', return_pressed) Code language: HTML, XML ( xml ) Root.mainloop() Code language: Python ( python ) The following program illustrates how to bind the return_pressed function to the Return key pressed event of the 'Save' button: import tkinter as tk It means that you can have multiple event handlers that respond to the same event. If you want to register an additional handler, you can pass the '+' to the add argument. When an event occurs in the widget, Tkinter will invoke the handler automatically with the event detail. The following shows the general syntax of the bind() method: widget.bind(event, handler, add=None) Therefore, Tkinter provides you with an alternative way for event binding via the bind() method. However, not all Tkinter widgets support the command option. In the previous tutorial, you learned how to bind a function to an event of a widget via the command option. When the event occurs, the assigned function is invoked automatically. Introduction to the Tkinter event bindingĪssigning a function to an event of a widget is called event binding. Summary: in this tutorial, you’ll learn about the Tkinter event binding mechanism. ![]()
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