kivy/kivy — pull request #563 by gau-veldt (2012-07-09 06:39:30+00:00)
Title: Callable filters support for kivy.uix.filechooser

Callable filters are useful for things like content-aware filtering (eg: a filter that shows all loadable images regardless of extensions) but could also provide other matching mechanisms such as regexes, predicates (eg: file size > some number), etc. You might also use as the filter the method of a class whose properties control what the filter does.