RawView class

The lower level workhorse widget for View that bootstraps a render tree for a view.

Typically, the View widget is used instead of a RawView widget to create a view, since, in addition to creating a view, it also adds some useful widgets, such as a MediaQuery and FocusScope. The RawView widget is only used directly if it is not desirable to have these additional widgets around the resulting widget tree. The View widget uses the RawView widget internally to manage its FlutterView.

This widget can be used at the root of the widget tree outside of any other View or RawView widget, as a child to a ViewCollection, or in the ViewAnchor.view slot of a ViewAnchor widget. It is not required to be a direct child of those widgets; other non-RenderObjectWidgets may appear in between the two (such as an InheritedWidget).

Each FlutterView can be associated with at most one View or RawView widget in the widget tree. Two or more View or RawView widgets configured with the same FlutterView must never exist within the same widget tree at the same time. This limitation is enforced by a GlobalObjectKey that derives its identity from the view provided to this widget.

Since the RawView widget bootstraps its own independent render tree, neither it nor any of its descendants will insert a RenderObject into an existing render tree. Therefore, the RawView widget can only be used in those parts of the widget tree where it is not required to participate in the construction of the surrounding render tree. In other words, the widget may only be used in a non-rendering zone of the widget tree (see WidgetsBinding for a definition of rendering and non-rendering zones).

To find the FlutterView associated with a BuildContext, use View.of or View.maybeOf, even if the view was created using RawView instead of View.

See also:

• View for a higher level interface that also sets up a MediaQuery and FocusScope for the view's widget tree.