connectDragBegin
fun connectDragBegin(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (startX: Double, startY: Double) -> Unit): <Error class: unknown class>
Emitted whenever dragging starts.
Parameters
connectFlags
A combination of ConnectFlags
handler
the Callback to connect. Params: startX X coordinate, relative to the widget allocation; startY Y coordinate, relative to the widget allocation