A `GtkFilter` object describes the filtering to be performed by a [class@Gtk.
FilterListModel].
The model will use the filter to determine if it should include items or not by calling [[email protected]] for each item and only keeping the ones that the function returns true for.
Filters may change what items they match through their lifetime. In that case, they will emit the [[email protected]:
GtkFilter:changed] signal to notify that previous filter results are no longer valid and that items should be checked again via [
[email protected]].
GTK provides various pre-made filter implementations for common filtering operations. These filters often include properties that can be linked to various widgets to easily allow searches.
However, in particular for large lists or complex search methods, it is also possible to subclass `GtkFilter` and provide one's own filter.