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Use const route for notAnnounced. (#144050)
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@ -138,7 +138,7 @@ enum RoutePopDisposition {
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/// The type argument `T` is the route's return type, as used by
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/// [currentResult], [popped], and [didPop]. The type `void` may be used if the
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/// route does not return a value.
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abstract class Route<T> {
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abstract class Route<T> extends _RoutePlaceholder {
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/// Initialize the [Route].
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///
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/// If the [settings] are not provided, an empty [RouteSettings] object is
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@ -2896,10 +2896,9 @@ enum _RouteLifecycle {
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typedef _RouteEntryPredicate = bool Function(_RouteEntry entry);
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class _NotAnnounced extends Route<void> {
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// A placeholder for the lastAnnouncedPreviousRoute, the
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// lastAnnouncedPoppedNextRoute, and the lastAnnouncedNextRoute before any
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// change has been announced.
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/// Placeholder for a route.
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class _RoutePlaceholder {
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const _RoutePlaceholder();
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}
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class _RouteEntry extends RouteTransitionRecord {
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@ -2937,12 +2936,12 @@ class _RouteEntry extends RouteTransitionRecord {
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/// remove as a result of a page update.
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static const int kDebugPopAttemptLimit = 100;
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static final Route<dynamic> notAnnounced = _NotAnnounced();
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static const _RoutePlaceholder notAnnounced = _RoutePlaceholder();
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_RouteLifecycle currentState;
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Route<dynamic>? lastAnnouncedPreviousRoute = notAnnounced; // last argument to Route.didChangePrevious
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WeakReference<Route<dynamic>> lastAnnouncedPoppedNextRoute = WeakReference<Route<dynamic>>(notAnnounced); // last argument to Route.didPopNext
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Route<dynamic>? lastAnnouncedNextRoute = notAnnounced; // last argument to Route.didChangeNext
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_RoutePlaceholder? lastAnnouncedPreviousRoute = notAnnounced; // last argument to Route.didChangePrevious
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WeakReference<_RoutePlaceholder> lastAnnouncedPoppedNextRoute = WeakReference<_RoutePlaceholder>(notAnnounced); // last argument to Route.didPopNext
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_RoutePlaceholder? lastAnnouncedNextRoute = notAnnounced; // last argument to Route.didChangeNext
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int? lastFocusNode; // The last focused semantic node for the route entry.
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/// Restoration ID to be used for the encapsulating route when restoration is
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@ -40,10 +40,7 @@ void main() {
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// TODO(polina-c): clean up leaks, https://github.com/flutter/flutter/issues/134787 [leaks-to-clean]
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LeakTesting.settings = LeakTesting.settings.withIgnored(classes: <String>['CurvedAnimation']);
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testWidgets('RenderParagraph relayout upon system fonts changes',
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// TODO(polina-c): dispose _NotAnnounced, https://github.com/dart-lang/leak_tracker/issues/218 [leaks-to-clean]
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experimentalLeakTesting: LeakTesting.settings.withIgnored(classes: <String>['ValueNotifier<String?>', '_NotAnnounced']),
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(WidgetTester tester) async {
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testWidgets('RenderParagraph relayout upon system fonts changes', (WidgetTester tester) async {
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await tester.pumpWidget(
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const MaterialApp(
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home: Text('text widget'),
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