Drop.readValueAsync

void readValueAsync(gobject.types.GType type,  int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Asynchronously request the drag operation's contents converted to the given type.

When the operation is finished callback will be called. You must then call gdk.drop.Drop.readValueFinish to get the resulting gobject.value.Value.

For local drag-and-drop operations that are available in the given GType, the value will be copied directly. Otherwise, GDK will try to use funcGdk.content_deserialize_async to convert the data.

Parameters

`type`	a `GType` to read
`ioPriority`	the I/O priority of the request.
`cancellable`	optional gio.cancellable.Cancellable object, null to ignore.
`callback`	callback to call when the request is satisfied