To implement this you have to add a preview widget to the GtkFileChooser. See http://developer.gnome.org/doc/API/2.0/gtk/GtkFileChooser.html#gtk-file-chooser-set-preview-widget
To implement this you have to add a preview widget to the GtkFileChooser. See http:// developer. gnome.org/ doc/API/ 2.0/gtk/ GtkFileChooser. html#gtk- file-chooser- set-preview- widget