Extracted from Pike v7.8 release 866 at 2016-11-06.
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GTK2
GTK2.FileChooser

Methods
 add_filter()
 add_shortcut_folder()
 add_shortcut_folder_uri()
 get_action()
 get_current_folder()
 get_current_folder_uri()
 get_do_overwrite_confirmation()
 get_extra_widget()
 get_filename()
 get_filenames()
 get_filter()
 get_local_only()
 get_preview_filename()
 get_preview_uri()
 get_preview_widget()
 get_preview_widget_active()
 get_select_multiple()
 get_show_hidden()
 get_uri()
 get_uris()
 get_use_preview_label()
 list_filters()
 list_shortcut_folder_uris()
 list_shortcut_folders()
 remove_filter()
 remove_shortcut_folder()
 remove_shortcut_folder_uri()
 select_all()
 select_filename()
 select_uri()
 set_action()
 set_current_folder()
 set_current_folder_uri()
 set_current_name()
 set_do_overwrite_confirmation()
 set_extra_widget()
 set_filename()
 set_filter()
 set_local_only()
 set_preview_widget()
 set_preview_widget_active()
 set_select_multiple()
 set_show_hidden()
 set_uri()
 set_use_preview_label()
 unselect_all()
 unselect_filename()
 unselect_uri()
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GTK2.FileChooser()->set_preview_widget_active()next

Method GTK2.FileChooser()->set_preview_widget()

Method set_preview_widget

GTK2.FileChooser set_preview_widget(GTK2.Widget widget)

Description

Sets an application-supplied widget to use to display a custom preview of the currently selected file. To implement a preview, after setting the preview widget, you connect to the "update-preview" signal, and call get_preview_filename() or get_preview_uri() on each change. If you can display a preview of the new file, update your widget and set the preview active using set_preview_widget_active(). Otherwise, set the preview inactive.

When there is no application-supplied preview widget, or the application- supplied preview widget is not active, the file chooser may display an internally generated preview of the current file or it may display no preview at all.