gtk:filter, gtk:buildable, gobject:object, common-lisp:standard-object, common-lisp:t

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The gtk:file-filter object can be used to restrict the files being shown in a gtk:file-chooser widget. Files can be filtered based on their name with the gtk:file-filter-add-pattern function or on their MIME type with the gtk:file-filter-add-mime-type function.

Filtering by MIME types handles aliasing and subclassing of MIME types. For example, a filter for text/plain also matches a file with MIME type application/rtf, since application/rtf is a subclass of text/plain. Note that the gtk:file-filter object allows wildcards for the subtype of a MIME type, so you can, for example, filter for image/*.

Normally, file filters are used by adding them to a gtk:file-chooser widget, see the gtk:file-chooser-add-filter function, but it is also possible to manually use a file filter on any gtk:filter-list-model object containing g:file-info objects. The gtk:file-filter implementation of the gtk:buildable interface supports adding rules using the <mime-types> and <patterns> elements and listing the rules within. Specifying a <mime-type> or <pattern> element has the same effect as calling the gtk:file-filter-add-mime-type or gtk:file-filter-add-pattern functions. An example of a UI definition fragment specifying gtk:file-filter rules:

<object class="GtkFileFilter">
  <property name="name" translatable="yes">Text and Images</property>
  <mime-types>
    <mime-type>text/plain</mime-type>
    <mime-type>image/ *</mime-type>
  </mime-types>
  <patterns>
    <pattern>*.txt</pattern>
  </patterns>
  <suffixes>
    <suffix>png</suffix>
  </suffixes>
</object>