<itemvalue="It will return the SheetObject of `sheet`. If the `sheet` does not exist then it will create `sheet` with `New Sheet Object`"/>
<itemvalue="- `null` - `true` and `false` - Instances of [int], [double], [String] - Instances created through list, map and set literals - Instances created by constructors of: - [List], [Map], [LinkedHashMap], [Set] and [LinkedHashSet] - [TransferableTypedData] - [Capability] - [SendPort] instances from [ReceivePort.sendPort] or [RawReceivePort.sendPort] where the receive ports are created using those classes' constructors. - Instances of [Type] representing one of the types mentioned above, `Object`, `dynamic`, `void` and `Never` as well as nullable variants of all these types. For generic types type arguments must be sendable types for the whole type to be sendable."/>
<itemvalue="If the sender and receiver isolate share the same code (e.g. isolates created via [Isolate.spawn]), the transitive object graph of [message] can contain any object, with the following exceptions:"/>
@ -60,14 +62,12 @@
<itemvalue="visit simple string literal"/>
<itemvalue="A widget that calls callbacks in response to common pointer events. It listens to events that can construct gestures, such as when the pointer is pressed, moved, then released or canceled. It does not listen to events that are exclusive to mouse, such as when the mouse enters, exits or hovers a region without pressing any buttons. For these events, use [MouseRegion]. Rather than listening for raw pointer events, consider listening for higher-level gestures using [GestureDetector]."/>
<itemvalue="An [Iterable] of Unicode code-points of this string. If the string contains surrogate pairs, they are combined and returned as one integer by this iterator. Unmatched surrogate halves are treated like valid 16-bit code-units."/>
<itemvalue="Whether this [State] object is currently in a tree. After creating a [State] object and before calling [initState], the framework "mounts" the [State] object by associating it with a [BuildContext]. The [State] object remains mounted until the framework calls [dispose], after which time the framework will never ask the [State] object to [build] again. It is an error to call [setState] unless [mounted] is true."/>
<itemvalue="Whether the [Widget] this context is associated with is currently mounted in the widget tree. Accessing the properties of the [BuildContext] or calling any methods on it is only valid while mounted is true. If mounted is false, assertions will trigger. Once unmounted, a given [BuildContext] will never become mounted again. {@macro flutter.widgets.BuildContext.asynchronous_gap}"/>