RootBackButtonDispatcher class

The default implementation of back button dispatcher for the root router.

This dispatcher listens to platform pop route notifications. When the platform wants to pop the current route, this dispatcher calls the BackButtonDispatcher.invokeCallback method to handle the request.

Inheritance
Mixed-in types

Constructors

RootBackButtonDispatcher()
Create a root back button dispatcher.

Properties

hasCallbacks → bool
Whether a callback is currently registered.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

addCallback(ValueGetter<Future<bool>> callback) → void
Register the callback to be called when the object changes.
createChildBackButtonDispatcher() → ChildBackButtonDispatcher
Creates a ChildBackButtonDispatcher that is a direct descendant of this back button dispatcher.
inherited
deferTo(ChildBackButtonDispatcher child) → void
Mark the given child as taking priority over this object and the other children.
inherited
didChangeAccessibilityFeatures() → void
Called when the system changes the set of currently active accessibility features.
inherited
didChangeAppLifecycleState(AppLifecycleState state) → void
Called when the system puts the app in the background or returns the app to the foreground.
inherited
didChangeLocales(List<Locale>? locales) → void
Called when the system tells the app that the user's locale has changed. For example, if the user changes the system language settings.
inherited
didChangeMetrics() → void
Called when the application's dimensions change. For example, when a phone is rotated.
inherited
didChangePlatformBrightness() → void
Called when the platform brightness changes.
inherited
didChangeTextScaleFactor() → void
Called when the platform's text scale factor changes.
inherited
didChangeViewFocus(ViewFocusEvent event) → void
Called whenever the PlatformDispatcher receives a notification that the focus state on a view has changed.
inherited
didHaveMemoryPressure() → void
Called when the system is running low on memory.
inherited
didPopRoute() → Future<bool>
Called when the system tells the app to pop the current route, such as after a system back button press or back gesture.
override
didPushRoute(String route) → Future<bool>
Called when the host tells the application to push a new route onto the navigator.
inherited
didPushRouteInformation(RouteInformation routeInformation) → Future<bool>
Called when the host tells the application to push a new RouteInformation and a restoration state onto the router.
inherited
didRequestAppExit() → Future<AppExitResponse>
Called when a request is received from the system to exit the application.
inherited
forget(ChildBackButtonDispatcher child) → void
Causes the given child to be removed from the list of children to which this object might defer, as if deferTo had never been called for that child.
inherited
handleCancelBackGesture() → void
Called when a predictive back gesture is canceled, indicating that no navigation should occur.
inherited
handleCommitBackGesture() → void
Called when a predictive back gesture is finished successfully, indicating that the current route should be popped.
inherited
handleStartBackGesture(PredictiveBackEvent backEvent) → bool
Called at the start of a predictive back gesture.
inherited
handleUpdateBackGestureProgress(PredictiveBackEvent backEvent) → void
Called when a predictive back gesture moves.
inherited
invokeCallback(Future<bool> defaultValue) → Future<bool>
Handles a pop route request.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
removeCallback(ValueGetter<Future<bool>> callback) → void
Remove a previously registered callback.
takePriority() → void
Make this BackButtonDispatcher take priority among its peers.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited