MemoryPressureHandler class
Handles system memory pressure warnings.
Listens to WidgetsBindingObserver.didHaveMemoryPressure and notifies registered listeners to release memory.
- Inheritance
-
- Object
- WidgetsBindingObserver
- MemoryPressureHandler
Constructors
- MemoryPressureHandler()
-
Returns the singleton instance of MemoryPressureHandler.
factory
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addListener(
void listener(bool critical)) → void - Registers a callback to be invoked when memory pressure is detected.
-
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.
override
-
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.
inherited
-
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
-
dispose(
) → void - Manually dispose the handler (mostly for testing).
-
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
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
removeListener(
void listener(bool critical)) → void - Removes a previously registered callback.
-
simulateMemoryPressure(
{bool critical = true}) → void - Simulates a memory pressure event for testing purposes.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited