physicalSize property

The current dimensions of the rectangle as last reported by the platform into which scenes rendered in this view are drawn.

If the view is configured with loose physicalConstraints this value may be outdated by a few frames as it only updates when the size chosen for a frame (as provided to the render method) is processed by the platform. Because of this, physicalConstraints should be used instead of this value as the root input to the layout algorithm of UI frameworks.

When this changes, PlatformDispatcher.onMetricsChanged is called. When using the Flutter framework, using MediaQuery.of to obtain the size (via MediaQueryData.size), instead of directly obtaining the physicalSize from a FlutterView, will automatically cause any widgets dependent on the size to rebuild when the size changes, without having to listen to PlatformDispatcher.onMetricsChanged.

At startup, the size of the view may not be known before Dart code runs. If this value is observed early in the application lifecycle, it may report Size.zero.

This value does not take into account any on-screen keyboards or other system UI. The padding and viewInsets properties provide information about how much of each side of the view may be obscured by system UI.

See also:

• WidgetsBindingObserver, for a mechanism at the widgets layer to observe when this value changes.