SchedulerBinding mixin Null safety

Scheduler for running the following:

Superclass Constraints
Mixin Applications

Properties

schedulingStrategy SchedulingStrategy
The strategy to use when deciding whether to run a task or not.
read / write
lifecycleState AppLifecycleState?
Whether the application is visible, and if so, whether it is currently interactive.
read-only
transientCallbackCount int
The current number of transient frame callbacks scheduled.
read-only
endOfFrame Future<void>
Returns a Future that completes after the frame completes.
read-only
hasScheduledFrame bool
Whether this scheduler has requested that handleBeginFrame be called soon.
read-only
schedulerPhase SchedulerPhase
The phase that the scheduler is currently operating under.
read-only
framesEnabled bool
Whether frames are currently being scheduled when scheduleFrame is called.
read-only
currentFrameTimeStamp Duration
The time stamp for the frame currently being processed.
read-only
currentSystemFrameTimeStamp Duration
The raw time stamp as provided by the engine to dart:ui.PlatformDispatcher.onBeginFrame for the frame currently being processed.
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

Methods

addPersistentFrameCallback(FrameCallback callback) → void
Adds a persistent frame callback.
addPostFrameCallback(FrameCallback callback) → void
Schedule a callback for the end of this frame.
addTimingsCallback(TimingsCallback callback) → void
Add a TimingsCallback that receives FrameTiming sent from the engine.
cancelFrameCallbackWithId(int id) → void
Cancels the transient frame callback with the given id.
debugAssertNoTransientCallbacks(String reason) bool
Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception.
ensureFrameCallbacksRegistered() → void
Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
protected">@protected
ensureVisualUpdate() → void
Schedules a new frame using scheduleFrame if this object is not currently producing a frame.
handleAppLifecycleStateChanged(AppLifecycleState state) → void
Called when the application lifecycle state changes.
mustCallSuper">@mustCallSuperprotected">@protected
handleBeginFrame(Duration? rawTimeStamp) → void
Called by the engine to prepare the framework to produce a new frame.
handleDrawFrame() → void
Called by the engine to produce a new frame.
handleEventLoopCallback() bool
Execute the highest-priority task, if it is of a high enough priority.
visibleForTesting">@visibleForTesting
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
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
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.
resetEpoch() → void
Prepares the scheduler for a non-monotonic change to how time stamps are calculated.
scheduleForcedFrame() → void
Schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame.
scheduleFrame() → void
If necessary, schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame.
scheduleFrameCallback(FrameCallback callback, {bool rescheduling = false}) int
Schedules the given transient frame callback.
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.
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.
toString() String
A string representation of this object.
inherited
unlocked() → void
Called by lockEvents when events get unlocked.
override

Operators

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

Static Properties

instance SchedulerBinding
The current SchedulerBinding, if one has been created.
read-only

Static Methods

debugPrintTransientCallbackRegistrationStack() → void
Prints the stack for where the current transient callback was registered.