PaintingBinding mixin

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

Mixin Applications

Properties

accessibilityFocus → ValueNotifier<int?>: Listenable that notifies when the accessibility focus on the system have changed.
finalinherited
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.
no setterinherited
currentFrameTimeStamp → Duration: The time stamp for the frame currently being processed.
no setterinherited
currentSystemFrameTimeStamp → Duration: The raw time stamp as provided by the engine to dart:ui.PlatformDispatcher.onBeginFrame for the frame currently being processed.
no setterinherited
defaultBinaryMessenger → BinaryMessenger: The default instance of BinaryMessenger.
no setterinherited
endOfFrame → Future<void>: Returns a Future that completes after the frame completes.
no setterinherited
framesEnabled → bool: Whether frames are currently being scheduled when scheduleFrame is called.
no setterinherited
hashCode → int: The hash code for this object.
no setterinherited
hasScheduledFrame → bool: Whether this scheduler has requested that handleBeginFrame be called soon.
no setterinherited
imageCache → ImageCache: The singleton that implements the Flutter framework's image cache.
no setter
keyboard → HardwareKeyboard: The global singleton instance of HardwareKeyboard, which can be used to query keyboard states.
no setterinherited
keyEventManager → KeyEventManager: The global singleton instance of KeyEventManager, which is used internally to dispatch key messages.
no setterinherited
lifecycleState → AppLifecycleState?: Whether the application is visible, and if so, whether it is currently interactive.
no setterinherited
locked → bool: Whether lockEvents is currently locking events.
no setterinherited
platformDispatcher → PlatformDispatcher: The ui.PlatformDispatcher to which this binding is bound.
no setterinherited
restorationManager → RestorationManager: The RestorationManager synchronizes the restoration data between engine and framework.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
schedulerPhase → SchedulerPhase: The phase that the scheduler is currently operating under.
no setterinherited
schedulingStrategy ↔ SchedulingStrategy: The strategy to use when deciding whether to run a task or not.
getter/setter pairinherited
systemFonts → Listenable: Listenable that notifies when the available fonts on the system have changed.
no setter
transientCallbackCount → int: The current number of transient frame callbacks scheduled.
no setterinherited
window → SingletonFlutterWindow: Deprecated. Will be removed in a future version of Flutter.
no setterinherited

Methods

addPersistentFrameCallback(FrameCallback callback) → void: Adds a persistent frame callback.
inherited
addPostFrameCallback(FrameCallback callback, {String debugLabel = '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.
inherited
createImageCache() → ImageCache: Creates the ImageCache singleton (accessible via imageCache).
createRestorationManager() → RestorationManager: Creates the RestorationManager instance available via restorationManager.
inherited
debugAssertNoPendingPerformanceModeRequests(String reason) → bool: Asserts that there are no pending performance mode requests in debug mode.
inherited
debugAssertNoTimeDilation(String reason) → bool: Asserts that there is no artificial time dilation in debug mode.
inherited
debugAssertNoTransientCallbacks(String reason) → bool: Asserts that there are no registered transient callbacks; if there are, prints their locations and throws an exception.
inherited
debugCheckZone(String entryPoint) → bool: Checks that the current Zone is the same as that which was used to initialize the binding.
inherited
debugGetRequestedPerformanceMode() → DartPerformanceMode?: Returns the current DartPerformanceMode requested or null if no requests have been made.
inherited
ensureFrameCallbacksRegistered() → void: Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
inherited
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.
override
exitApplication(AppExitType exitType, [int exitCode = 0]) → Future<AppExitResponse>: Exits the application by calling the native application API method for exiting an application cleanly.
inherited
handleAppLifecycleStateChanged(AppLifecycleState state) → void: Called when the application lifecycle state changes.
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
handleEventLoopCallback() → bool: Execute the highest-priority task, if it is of a high enough priority.
inherited
handleMemoryPressure() → void: Called when the operating system notifies the application of a memory pressure situation.
override
handleRequestAppExit() → Future<AppExitResponse>: Handles any requests for application exit that may be received on the SystemChannels.platform method channel.
inherited
handleSystemMessage(Object systemMessage) → Future<void>: Handler called for messages received on the SystemChannels.system message channel.
override
handleViewFocusChanged(ViewFocusEvent event) → void: Called whenever the PlatformDispatcher receives a notification that the focus state on a view has changed.
inherited
initializationComplete() → Future<void>: Alert the engine that the binding is registered. This instructs the engine to register its top level window handler on Windows. This signals that the app is able to process "System.requestAppExit" signals from the engine.
inherited
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.
inherited
initServiceExtensions() → void: Called when the binding is initialized, to register service extensions.
inherited
instantiateImageCodecFromBuffer(ImmutableBuffer buffer, {int? cacheWidth, int? cacheHeight, bool allowUpscaling = false}) → Future<Codec>: Calls through to dart:ui.instantiateImageCodecFromBuffer from ImageCache.
instantiateImageCodecWithSize(ImmutableBuffer buffer, {TargetImageSizeCallback? getTargetSize}) → Future<Codec>: Calls through to dart:ui.instantiateImageCodecWithSize from ImageCache.
lockEvents(Future<void> callback()) → Future<void>: Locks the dispatching of asynchronous events and callbacks until the callback's future completes.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent 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.
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.
inherited
readInitialLifecycleStateFromNativeWindow() → void: Initializes the lifecycleState with the dart:ui.PlatformDispatcher.initialLifecycleState.
inherited
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.)
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.)
inherited
registerServiceExtension({required String name, required ServiceExtensionCallback callback}) → void: Registers a service extension method with the given name (full name "ext.flutter.name").
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.
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.
inherited
removeTimingsCallback(TimingsCallback callback) → void: Removes a callback that was earlier added by addTimingsCallback.
inherited
requestPerformanceMode(DartPerformanceMode mode) → PerformanceModeRequestHandle?: Request a specific DartPerformanceMode.
inherited
resetEpoch() → void: Prepares the scheduler for a non-monotonic change to how time stamps are calculated.
inherited
resetInternalState() → void: Allows the test framework to reset the lifecycle state and framesEnabled back to their initial values.
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.
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.
inherited
toString() → String: A string representation of this object.
inherited
unlocked() → void: Called by lockEvents when events get unlocked.
inherited

Operators

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

Static Properties

instance → PaintingBinding: The current PaintingBinding, if one has been created.
no setter
shaderWarmUp ↔ ShaderWarmUp?: ShaderWarmUp instance to be executed during initInstances.
getter/setter pair