RendererBinding mixin

The glue between the render trees and the Flutter engine.

The RendererBinding manages multiple independent render trees. Each render tree is rooted in a RenderView that must be added to the binding via addRenderView to be considered during frame production, hit testing, etc. Furthermore, the render tree must be managed by a PipelineOwner that is part of the pipeline owner tree rooted at rootPipelineOwner.

Adding PipelineOwners and RenderViews to this binding in the way described above is left as a responsibility for a higher level abstraction. The widgets library, for example, introduces the View widget, which registers its RenderView and PipelineOwner with this binding.

Superclass constraints

Mixin applications

Properties

accessibilityFeatures → AccessibilityFeatures: The currently active set of ui.AccessibilityFeatures.
no setterinherited
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
debugOutstandingSemanticsHandles → int: The number of clients registered to listen for semantics.
no setterinherited
debugSamplingClock → SamplingClock?: Overrides the sampling clock for debugging and testing.
no setterinherited
defaultBinaryMessenger → BinaryMessenger: The default instance of BinaryMessenger.
no setterinherited
disableAnimations → bool: The platform is requesting that animations be disabled or simplified.
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
gestureArena → GestureArenaManager: The gesture arenas used for disambiguating the meaning of sequences of pointer events.
finalinherited
hashCode → int: The hash code for this object.
no setterinherited
hasScheduledFrame → bool: Whether this scheduler has requested that handleBeginFrame be called soon.
no setterinherited
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
mouseTracker → MouseTracker: The object that manages state about currently connected mice, for hover notification.
no setter
pipelineOwner → PipelineOwner: Deprecated. Will be removed in a future version of Flutter.
latefinal
platformDispatcher → PlatformDispatcher: The ui.PlatformDispatcher to which this binding is bound.
no setterinherited
pointerRouter → PointerRouter: A router that routes all pointer events received from the engine.
finalinherited
pointerSignalResolver → PointerSignalResolver: The resolver used for determining which widget handles a PointerSignalEvent.
finalinherited
renderView → RenderView: Deprecated. Will be removed in a future version of Flutter.
latefinal
renderViews → Iterable<RenderView>: The RenderViews managed by this binding.
no setter
resamplingEnabled ↔ bool: Enable pointer event resampling for touch devices by setting this to true.
getter/setter pairinherited
restorationManager → RestorationManager: The RestorationManager synchronizes the restoration data between engine and framework.
no setterinherited
rootPipelineOwner → PipelineOwner: The PipelineOwner that is the root of the PipelineOwner tree.
no setter
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
samplingClock → SamplingClock: Provides access to the current DateTime and StopWatch objects for sampling.
no setterinherited
samplingOffset ↔ Duration: Offset relative to current frame time that should be used for resampling. The samplingOffset is expected to be negative. Non-negative samplingOffset is allowed but will effectively disable resampling.
getter/setter pairinherited
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
semanticsEnabled → bool: Whether semantics information must be collected.
no setterinherited
sendFramesToEngine → bool: Whether frames produced by drawFrame are sent to the engine.
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
addRenderView(RenderView view) → void: Adds a RenderView to this binding.
addSemanticsEnabledListener(VoidCallback listener) → void: Adds a listener to be called when semanticsEnabled changes.
inherited
addTimingsCallback(TimingsCallback callback) → void: Add a TimingsCallback that receives FrameTiming sent from the engine.
inherited
allowFirstFrame() → void: Called after deferFirstFrame to tell the framework that it is ok to send the first frame to the engine now.
cancelFrameCallbackWithId(int id) → void: Cancels the transient frame callback with the given id.
inherited
cancelPointer(int pointer) → void: Dispatch a PointerCancelEvent for the given pointer soon.
inherited
createBinaryMessenger() → BinaryMessenger: Creates a default BinaryMessenger instance that can be used for sending platform messages.
inherited
createCanvas(PictureRecorder recorder) → Canvas: Create a Canvas from a PictureRecorder.
createPictureRecorder() → PictureRecorder: Create a PictureRecorder.
createRestorationManager() → RestorationManager: Creates the RestorationManager instance available via restorationManager.
inherited
createRootPipelineOwner() → PipelineOwner: Creates the PipelineOwner that serves as the root of the pipeline owner tree (rootPipelineOwner).
createSceneBuilder() → SceneBuilder: Create a SceneBuilder.
createSemanticsUpdateBuilder() → SemanticsUpdateBuilder: Creates an empty semantics update builder.
inherited
createViewConfigurationFor(RenderView renderView) → ViewConfiguration: Returns a ViewConfiguration configured for the provided RenderView based on the current environment.
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
deferFirstFrame() → void: Tell the framework to not send the first frames to the engine until there is a corresponding call to allowFirstFrame.
dispatchEvent(PointerEvent event, HitTestResult? hitTestResult) → void: Dispatch an event to pointerRouter and the path of a hit test result.
override
drawFrame() → void: Pump the rendering pipeline to generate a frame.
ensureFrameCallbacksRegistered() → void: Ensures callbacks for PlatformDispatcher.onBeginFrame and PlatformDispatcher.onDrawFrame are registered.
inherited
ensureSemantics() → SemanticsHandle: Creates a new SemanticsHandle and requests the collection of semantics information.
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.
inherited
exitApplication(AppExitType exitType, [int exitCode = 0]) → Future<AppExitResponse>: Exits the application by calling the native application API method for exiting an application cleanly.
inherited
handleAccessibilityFeaturesChanged() → void: Called when the platform accessibility features change.
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
handleEvent(PointerEvent event, HitTestEntry<HitTestTarget> entry) → void: Override this method to receive events.
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.
inherited
handleMetricsChanged() → void: Called when the system metrics change.
handlePlatformBrightnessChanged() → void: Called when the platform brightness changes.
handlePointerEvent(PointerEvent event) → void: Dispatch an event to the targets found by a hit test on its position.
inherited
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.
inherited
handleTextScaleFactorChanged() → void: Called when the platform text scale factor changes.
handleViewFocusChanged(ViewFocusEvent event) → void: Called whenever the PlatformDispatcher receives a notification that the focus state on a view has changed.
inherited
hitTest(HitTestResult result, Offset position) → void: Deprecated. Use hitTestInView instead.
inherited
hitTestInView(HitTestResult result, Offset position, int viewId) → void: Determine which HitTestTarget objects are located at a given position in the specified view.
override
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
initMouseTracker([MouseTracker? tracker]) → void: Creates a MouseTracker which manages state about currently connected mice, for hover notification.
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.
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.
override
performSemanticsAction(SemanticsActionEvent action) → void: Called whenever the platform requests an action to be performed on a SemanticsNode.
override
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
removeRenderView(RenderView view) → void: Removes a RenderView previously added with addRenderView from the binding.
removeSemanticsEnabledListener(VoidCallback listener) → void: Removes a listener added by addSemanticsEnabledListener.
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
resetFirstFrameSent() → void: Call this to pretend that no frames have been sent to the engine yet.
resetGestureBinding() → void: Reset states of GestureBinding.
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 → RendererBinding: The current RendererBinding, if one has been created.
no setter

RendererBinding mixin

Properties

Methods

Operators

Static Properties

rendering library