PaintingBinding mixin Null safety

Binding for the painting library.

Hooks into the cache eviction logic to clear the image cache.

Requires the ServicesBinding to be mixed in earlier.

Superclass Constraints

Implemented by

Constructors

PaintingBinding()

Properties

imageCache → ImageCache?: The singleton that implements the Flutter framework's image cache. [...]
read-only
systemFonts → Listenable: Listenable that notifies when the available fonts on the system have changed. [...]
read-only
window → SingletonFlutterWindow: The main window to which this binding is bound. [...]
read-only, inherited
platformDispatcher → PlatformDispatcher: The ui.PlatformDispatcher to which this binding is bound. [...]
read-only, inherited
locked → bool: Whether lockEvents is currently locking events. [...]
@protected, read-only, inherited
hashCode → int: The hash code for this object. [...]
read-only, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited
keyboard → HardwareKeyboard: The global singleton instance of HardwareKeyboard, which can be used to query keyboard states.
read-only, inherited
keyEventManager → KeyEventManager: The global singleton instance of KeyEventManager, which is used internally to dispatch key messages.
read-only, inherited
defaultBinaryMessenger → BinaryMessenger: The default instance of BinaryMessenger. [...]
read-only, inherited
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, inherited
restorationManager → RestorationManager: The RestorationManager synchronizes the restoration data between engine and framework. [...]
read-only, inherited
lifecycleState → AppLifecycleState?: Whether the application is visible, and if so, whether it is currently interactive. [...]
read-only, inherited
transientCallbackCount → int: The current number of transient frame callbacks scheduled. [...]
read-only, inherited
endOfFrame → Future<void>: Returns a Future that completes after the frame completes. [...]
read-only, inherited
hasScheduledFrame → bool: Whether this scheduler has requested that handleBeginFrame be called soon.
read-only, inherited
schedulerPhase → SchedulerPhase: The phase that the scheduler is currently operating under.
read-only, inherited
framesEnabled → bool: Whether frames are currently being scheduled when scheduleFrame is called. [...]
read-only, inherited
currentFrameTimeStamp → Duration: The time stamp for the frame currently being processed. [...]
read-only, inherited
currentSystemFrameTimeStamp → Duration: The raw time stamp as provided by the engine to dart:ui.PlatformDispatcher.onBeginFrame for the frame currently being processed. [...]
read-only, inherited
schedulingStrategy ↔ SchedulingStrategy: The strategy to use when deciding whether to run a task or not. [...]
read / write, inherited

Methods

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
createImageCache() → ImageCache: Creates the ImageCache singleton (accessible via imageCache). [...]
@protected
instantiateImageCodec(Uint8List bytes, {int? cacheWidth, int? cacheHeight, bool allowUpscaling = false}) → Future<Codec>: Calls through to dart:ui.instantiateImageCodec from ImageCache. [...]
evict(String asset) → void: Called in response to the ext.flutter.evict service extension. [...]
override
handleMemoryPressure() → void: Called when the operating system notifies the application of a memory pressure situation. [...]
override
handleSystemMessage(Object systemMessage) → Future<void>: Handler called for messages received on the SystemChannels.system message channel. [...]
override
initServiceExtensions() → void: Called when the binding is initialized, to register service extensions. [...]
@mustCallSuper, @protected, inherited
lockEvents(Future<void> callback()) → Future<void>: Locks the dispatching of asynchronous events and callbacks until the callback's future completes. [...]
@protected, inherited
unlocked() → void: Called by lockEvents when events get unlocked. [...]
@mustCallSuper, @protected, inherited
reassembleApplication() → Future<void>: Cause the entire application to redraw, e.g. after a hot reload. [...]
inherited
performReassemble() → Future<void>: This method is called by reassembleApplication to actually cause the application to reassemble, e.g. after a hot reload. [...]
@mustCallSuper, @protected, inherited
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, 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, inherited
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, inherited
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, inherited
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, inherited
registerServiceExtension({required String name, required ServiceExtensionCallback callback}) → void: Registers a service extension method with the given name (full name "ext.flutter.name"). [...]
@protected, inherited
toString() → String: A string representation of this object. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited
createBinaryMessenger() → BinaryMessenger: Creates a default BinaryMessenger instance that can be used for sending platform messages.
@protected, inherited
initLicenses() → void: Adds relevant licenses to the LicenseRegistry. [...]
@mustCallSuper, @protected, inherited
readInitialLifecycleStateFromNativeWindow() → void: Initializes the lifecycleState with the dart:ui.SingletonFlutterWindow.initialLifecycleState. [...]
@protected, inherited
createRestorationManager() → RestorationManager: Creates the RestorationManager instance available via restorationManager. [...]
@protected, inherited
setSystemUiChangeCallback(SystemUiChangeCallback? callback) → void: Sets the callback for the SystemChrome.systemUIChange method call received on the SystemChannels.platform channel. [...]
inherited
addTimingsCallback(TimingsCallback callback) → void: Add a TimingsCallback that receives FrameTiming sent from the engine. [...]
inherited
removeTimingsCallback(TimingsCallback callback) → void: Removes a callback that was earlier added by addTimingsCallback.
inherited
handleAppLifecycleStateChanged(AppLifecycleState state) → void: Called when the application lifecycle state changes. [...]
@mustCallSuper, @protected, 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
handleEventLoopCallback() → bool: Execute the highest-priority task, if it is of a high enough priority. [...]
@visibleForTesting, inherited
scheduleFrameCallback(FrameCallback callback, {bool rescheduling = false}) → int: Schedules the given transient frame callback. [...]
inherited
cancelFrameCallbackWithId(int id) → void: Cancels the transient frame callback with the given id. [...]
inherited
debugAssertNoTransientCallbacks(String reason) → bool: Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception. [...]
inherited
addPersistentFrameCallback(FrameCallback callback) → void: Adds a persistent frame callback. [...]
inherited
addPostFrameCallback(FrameCallback callback) → void: Schedule a callback for the end of this frame. [...]
inherited
ensureFrameCallbacksRegistered() → void: Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
@protected, inherited
ensureVisualUpdate() → void: Schedules a new frame using scheduleFrame if this object is not currently producing a frame. [...]
inherited
scheduleFrame() → void: If necessary, schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame. [...]
inherited
scheduleForcedFrame() → void: Schedules a new frame by calling dart:ui.PlatformDispatcher.scheduleFrame. [...]
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
resetEpoch() → void: Prepares the scheduler for a non-monotonic change to how time stamps are calculated. [...]
inherited
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

Operators

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

Static Properties

instance → PaintingBinding?: The current PaintingBinding, if one has been created.
read-only, override
shaderWarmUp ↔ ShaderWarmUp?: ShaderWarmUp instance to be executed during initInstances. [...]
read / write