Spacing Application GUI spacings For creating graphical user interfaces with an unified look and feel it is important to have a set of functions to provide spacing information. The GPE spacing functions provide a basic set of functions for determining the most frquently used sizes for GUI development. Returns spacing between categories. @Returns: Size in pixels. Returns size for identing of GUI categories. @Returns: Size in pixels. Get the size of borders around widgets. This is used for borders around windows and dialogs mostly. @Returns: Border size in pixels. Returns spacings used to separate contents of boxes and tables. @Returns: Spacing in pixels.