onClose property
final
Called when the menu overlay is hidden.
When MenuController.close is called, onCloseRequested is invoked with
a hideOverlay callback that, when called, hides the menu overlay and
triggers onClose.
The default implementation of onCloseRequested calls hideOverlay
synchronously, thereby calling onClose synchronously. In this case,
onClose is called regardless of whether the menu overlay is already
hidden.
Custom implementations of onCloseRequested can delay the call to
hideOverlay or not call it at all, in which case onClose will not be
called. Calling hideOverlay after disposal is a no-op, and will not
trigger onClose.
Implementation
final VoidCallback? onClose;