onComputeSize
open fun onComputeSize(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (size: DragSurfaceSize) -> Unit): <Error class: unknown class>
Emitted when the size for the surface needs to be computed, when it is present.
This signal will normally be emitted during the native surface layout cycle when the surface size needs to be recomputed.
It is the responsibility of the drag surface user to handle this signal and compute the desired size of the surface, storing the computed size in the struct@Gdk.DragSurfaceSize object that is passed to the signal handler, using method@Gdk.DragSurfaceSize.set_size.
Failing to set a size so will result in an arbitrary size being used as a result.
Since
4.12
Parameters
connectFlags
a combination of ConnectFlags
handler
the Callback to connect. Params: size the size of the drag surface