ServicesBinding mixin Null safety

Listens for platform messages and directs them to the defaultBinaryMessenger.

The ServicesBinding also registers a LicenseEntryCollector that exposes the licenses found in the LICENSE file stored at the root of the asset bundle, and implements the ext.flutter.evict service extension (see evict).

Superclass Constraints
Mixin Applications

Properties

keyboard → HardwareKeyboard
The global singleton instance of HardwareKeyboard, which can be used to query keyboard states.
read-only
keyEventManager → KeyEventManager
The global singleton instance of KeyEventManager, which is used internally to dispatch key messages.
read-only
defaultBinaryMessenger → BinaryMessenger
The default instance of BinaryMessenger.
read-only
channelBuffers → ChannelBuffers
The low level buffering and dispatch mechanism for messages sent by plugins on the engine side to their corresponding plugin code on the framework side.
read-only
restorationManager → RestorationManager
The RestorationManager synchronizes the restoration data between engine and framework.
read-only
window → SingletonFlutterWindow
The main window to which this binding is bound.
read-onlyinherited
platformDispatcher → PlatformDispatcher
The ui.PlatformDispatcher to which this binding is bound.
read-onlyinherited
locked → bool
Whether lockEvents is currently locking events.
protected">@protectedread-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
schedulingStrategy ↔ SchedulingStrategy
The strategy to use when deciding whether to run a task or not.
read / writeinherited
lifecycleState → AppLifecycleState?
Whether the application is visible, and if so, whether it is currently interactive.
read-onlyinherited
transientCallbackCount → int
The current number of transient frame callbacks scheduled.
read-onlyinherited
endOfFrame → Future<void>
Returns a Future that completes after the frame completes.
read-onlyinherited
hasScheduledFrame → bool
Whether this scheduler has requested that handleBeginFrame be called soon.
read-onlyinherited
schedulerPhase → SchedulerPhase
The phase that the scheduler is currently operating under.
read-onlyinherited
framesEnabled → bool
Whether frames are currently being scheduled when scheduleFrame is called.
read-onlyinherited
currentFrameTimeStamp → Duration
The time stamp for the frame currently being processed.
read-onlyinherited
currentSystemFrameTimeStamp → Duration
The raw time stamp as provided by the engine to dart:ui.PlatformDispatcher.onBeginFrame for the frame currently being processed.
read-onlyinherited

Methods

addPersistentFrameCallback(FrameCallback callback) → void
Adds a persistent frame callback.
inherited
addPostFrameCallback(FrameCallback callback) → void
Schedule a callback for the end of this frame.
inherited
addTimingsCallback(TimingsCallback callback) → void
Add a TimingsCallback that receives FrameTiming sent from the engine.
inherited
cancelFrameCallbackWithId(int id) → void
Cancels the transient frame callback with the given id.
inherited
createBinaryMessenger() → BinaryMessenger
Creates a default BinaryMessenger instance that can be used for sending platform messages.
protected">@protected
createRestorationManager() → RestorationManager
Creates the RestorationManager instance available via restorationManager.
protected">@protected
debugAssertNoTransientCallbacks(String reason) → bool
Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception.
inherited
ensureFrameCallbacksRegistered() → void
Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
protected">@protectedinherited
ensureVisualUpdate() → void
Schedules a new frame using scheduleFrame if this object is not currently producing a frame.
inherited
evict(String asset) → void
Called in response to the ext.flutter.evict service extension.
mustCallSuper">@mustCallSuperprotected">@protected
handleAppLifecycleStateChanged(AppLifecycleState state) → void
Called when the application lifecycle state changes.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
handleBeginFrame(Duration? rawTimeStamp) → void
Called by the engine to prepare the framework to produce a new frame.
inherited
handleDrawFrame() → void
Called by the engine to produce a new frame.
inherited
handleEventLoopCallback() → bool
Execute the highest-priority task, if it is of a high enough priority.
visibleForTesting">@visibleForTestinginherited
handleMemoryPressure() → void
Called when the operating system notifies the application of a memory pressure situation.
mustCallSuper">@mustCallSuperprotected">@protected
handleSystemMessage(Object systemMessage) → Future<void>
Handler called for messages received on the SystemChannels.system message channel.
mustCallSuper">@mustCallSuperprotected">@protected
initInstances() → void
The initialization method. Subclasses override this method to hook into the platform and otherwise configure their services. Subclasses must call "super.initInstances()".
override
initLicenses() → void
Adds relevant licenses to the LicenseRegistry.
mustCallSuper">@mustCallSuperprotected">@protected
initServiceExtensions() → void
Called when the binding is initialized, to register service extensions.
override
lockEvents(Future<void> callback()) → Future<void>
Locks the dispatching of asynchronous events and callbacks until the callback's future completes.
protected">@protectedinherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
performReassemble() → Future<void>
This method is called by reassembleApplication to actually cause the application to reassemble, e.g. after a hot reload.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
postEvent(String eventKind, Map<String, dynamic> eventData) → void
All events dispatched by a BindingBase use this method instead of calling developer.postEvent directly so that tests for BindingBase can track which events were dispatched by overriding this method.
protected">@protectedinherited
readInitialLifecycleStateFromNativeWindow() → void
Initializes the lifecycleState with the dart:ui.PlatformDispatcher.initialLifecycleState.
protected">@protected
reassembleApplication() → Future<void>
Cause the entire application to redraw, e.g. after a hot reload.
inherited
registerBoolServiceExtension({required String name, required AsyncValueGetter<bool> getter, required AsyncValueSetter<bool> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument "enabled" which can have the value "true" or the value "false" or can be omitted to read the current value. (Any value other than "true" is considered equivalent to "false". Other arguments are ignored.)
protected">@protectedinherited
registerNumericServiceExtension({required String name, required AsyncValueGetter<double> getter, required AsyncValueSetter<double> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes a single argument with the same name as the method which, if present, must have a value that can be parsed by double.parse, and can be omitted to read the current value. (Other arguments are ignored.)
protected">@protectedinherited
registerServiceExtension({required String name, required ServiceExtensionCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name").
protected">@protectedinherited
registerSignalServiceExtension({required String name, required AsyncCallback callback}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which takes no arguments and returns no value.
protected">@protectedinherited
registerStringServiceExtension({required String name, required AsyncValueGetter<String> getter, required AsyncValueSetter<String> setter}) → void
Registers a service extension method with the given name (full name "ext.flutter.name"), which optionally takes a single argument with the name "value". If the argument is omitted, the value is to be read, otherwise it is to be set. Returns the current value.
protected">@protectedinherited
removeTimingsCallback(TimingsCallback callback) → void
Removes a callback that was earlier added by addTimingsCallback.
inherited
resetEpoch() → void
Prepares the scheduler for a non-monotonic change to how time stamps are calculated.
inherited
scheduleForcedFrame() → void
Schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame.
inherited
scheduleFrame() → void
If necessary, schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame.
inherited
scheduleFrameCallback(FrameCallback callback, {bool rescheduling = false}) → int
Schedules the given transient frame callback.
inherited
scheduleTask<T>(TaskCallback<T> task, Priority priority, {String? debugLabel, Flow? flow}) → Future<T>
Schedules the given task with the given priority and returns a Future that completes to the task's eventual return value.
inherited
scheduleWarmUpFrame() → void
Schedule a frame to run as soon as possible, rather than waiting for the engine to request a frame in response to a system "Vsync" signal.
inherited
setSystemUiChangeCallback(SystemUiChangeCallback? callback) → void
Sets the callback for the SystemChrome.systemUIChange method call received on the SystemChannels.platform channel.
toString() → String
A string representation of this object.
inherited
unlocked() → void
Called by lockEvents when events get unlocked.
mustCallSuper">@mustCallSuperprotected">@protectedinherited

Operators

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

Static Properties

instance → ServicesBinding
The current ServicesBinding, if one has been created.
read-onlyoverride