Packing Space and Display Space
The packer distinguishes between packing space and display space when it arranges the widgets. The display space is the area requested by a widget for the purposes of painting itself. The packing space is the area the packer allows for the placement of the widget. Because of geometry constraints, a widget may be allocated more (or less) packing space than it needs to display itself. The extra space, if any, is along the side of the cavity against which the widget was packed.
The -fill Option
The -fill packing option causes a widget to fill up the allocated packing space with its display. A widget can fill in the X or Y direction, or both. The default is not to fill, which is why the black background of the main ...
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