onDragBegin
fun onDragBegin(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (<Error class: unknown class>) -> Unit): <Error class: unknown class>(source)
Emitted on the drag source when a drag is started.
It can be used to e.g. set a custom drag icon with method@Gtk.DragSource.set_icon.
Parameters
connectFlags
a combination of ConnectFlags
handler
the Callback to connect. Params: drag the GdkDrag object