public delegate void ClipboardGetFunc (Clipboard clipboard, SelectionData selection_data, uint info, void* user_data_or_owner)
A function that will be called to provide the contents of the selection.
If multiple types of data were advertised, the requested type can be determined from the
info parameter or by checking the target
selection_data. If the data could successfully be converted into then it should be stored into the
object by calling @set (or related functions such as
set_text). If no data is set, the requestor will be informed that the
attempt to get the data failed.
a SelectionData argument in which the requested data should be stored.