SemanticsBinding mixin Null safety

The glue between the semantics layer and the Flutter engine.

Superclass Constraints
Mixin Applications

Properties

accessibilityFeatures → AccessibilityFeatures
The currently active set of AccessibilityFeatures.
read-only
disableAnimations → bool
The platform is requesting that animations be disabled or simplified.
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

createSemanticsUpdateBuilder() → SemanticsUpdateBuilder
Creates an empty semantics update builder.
handleAccessibilityFeaturesChanged() → void
Called when the platform accessibility features change.
protected">@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
initServiceExtensions() → void
Called when the binding is initialized, to register service extensions.
mustCallSuper">@mustCallSuperprotected">@protectedinherited
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
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 → SemanticsBinding
The current SemanticsBinding, if one has been created.
read-only