signal callback delegate or function to connect
void callback(gtk.file_chooser.FileChooser fileChooser)
fileChooser the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to UpdatePreview signal.
This signal is emitted when the preview in a file chooser should be regenerated. For example, this can happen when the currently selected file changes. You should use this signal if you want your file chooser to have a preview widget.
Once you have installed a preview widget with gtk.file_chooser.FileChooser.setPreviewWidget, you should update it when this signal is emitted. You can use the functions gtk.file_chooser.FileChooser.getPreviewFilename or gtk.file_chooser.FileChooser.getPreviewUri to get the name of the file to preview. Your widget may not be able to preview all kinds of files; your callback must call gtk.file_chooser.FileChooser.setPreviewWidgetActive to inform the file chooser about whether the preview was generated successfully or not.
Please see the example code in [Using a Preview Widget][gtkfilechooser-preview].
See also: gtk.file_chooser.FileChooser.setPreviewWidget, gtk.file_chooser.FileChooser.setPreviewWidgetActive, gtk.file_chooser.FileChooser.setUsePreviewLabel, gtk.file_chooser.FileChooser.getPreviewFilename, gtk.file_chooser.FileChooser.getPreviewUri.