Python in a Nutshell

Geometry Management

In all the examples so far, we have made each widget visible by calling method pack on the widget. This is representative of real-life Tkinter usage. However, two other layout managers exist and are sometimes useful. This section covers all three layout managers provided by the Tkinter module.

Never mix geometry managers for the same container widget: all children of each given container widget must be handled by the same geometry manager, or very strange effects (including Tkinter going into infinite loops) may result.

The Packer

Calling method pack on a widget delegates widget geometry management to a simple and flexible layout manager component called the Packer. The Packer sizes and positions each widget within a container (parent) widget, according to each widget’s space needs (including options padx and pady). Each widget w supplies the following Packer-related methods.

The Gridder

Calling method grid on a widget delegates widget geometry management to a specialized layout manager component called the Gridder. The Gridder sizes and positions each widget into cells of a table (grid) within a container (parent) widget. Each widget w supplies the following Gridder-related methods.

The Placer

Calling method place on a widget explicitly handles widget geometry management, thanks to a simple layout manager component called the Placer. The Placer sizes and positions each widget w within a container (parent) widget exactly as w explicitly requires. Other layout managers ...