onMetricsChanged property Null safety
override
A callback that is invoked whenever the devicePixelRatio, physicalSize, padding, viewInsets, PlatformDispatcher.views, or systemGestureInsets values change.
Accessing this value returns the value contained in the
PlatformDispatcher singleton, so instead of getting it from here, you
should consider getting it from WidgetsBinding.instance.platformDispatcher
instead
(or, when WidgetsBinding
isn't available, from
PlatformDispatcher.instance). The reason this value forwards to the
PlatformDispatcher is to provide convenience for applications that only
use a single main window.
See PlatformDispatcher.onMetricsChanged for more information.
Implementation
@override
ui.VoidCallback? get onMetricsChanged => platformDispatcher.onMetricsChanged;
override
Implementation
@override
set onMetricsChanged(ui.VoidCallback? callback) {
platformDispatcher.onMetricsChanged = callback;
}