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
signal, and call
gtkFileChooserGetPreviewUri on each change. If you can
display a preview of the new file, update your widget and
set the preview active using
Otherwise, set the preview inactive.
widget for displaying preview.
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. Since 2.4
Derived by RGtkGen from GTK+ documentation
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