The ::drag-begin signal is emitted on the drag source when a drag is started. A typical reason to connect to this signal is to set up a custom drag icon with e.g. gtk_drag_source_set_icon_pixbuf().
Note that some widgets set up a drag icon in the default handler of
this signal, so you may have to use
override what the default handler did.
|Default handler:|| |
The default handler is called after the handlers added via
The drag context.
|The data is owned by the caller of the function.|