SemanticsBinding mixin
The glue between the semantics layer and the Flutter engine.
- Superclass Constraints
- Mixin Applications
Properties
- semanticsEnabled → bool
-
Whether semantics information must be collected.
no setter
- debugOutstandingSemanticsHandles → int
-
The number of clients registered to listen for semantics.
no setter
- accessibilityFeatures → AccessibilityFeatures
-
The currently active set of AccessibilityFeatures.
no setter
- disableAnimations → bool
-
The platform is requesting that animations be disabled or simplified.
no setter
- window → SingletonFlutterWindow
-
Deprecated. Will be removed in a future version of Flutter.
no setterinherited
- platformDispatcher → PlatformDispatcher
-
The ui.PlatformDispatcher to which this binding is bound.
no setterinherited
- locked → bool
-
Whether lockEvents is currently locking events.
no setterinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addSemanticsEnabledListener(
VoidCallback listener) → void -
Adds a
listenerto be called when semanticsEnabled changes. -
createSemanticsUpdateBuilder(
) → SemanticsUpdateBuilder - Creates an empty semantics update builder.
-
debugCheckZone(
String entryPoint) → bool -
Checks that the current Zone is the same as that which was used
to initialize the binding.
inherited
-
ensureSemantics(
) → SemanticsHandle - Creates a new SemanticsHandle and requests the collection of semantics information.
-
handleAccessibilityFeaturesChanged(
) → void - Called when the platform accessibility features change.
-
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.
inherited
-
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
-
performSemanticsAction(
SemanticsActionEvent action) → void - Called whenever the platform requests an action to be performed on a SemanticsNode.
-
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
-
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
-
removeSemanticsEnabledListener(
VoidCallback listener) → void -
Removes a
listeneradded by addSemanticsEnabledListener. -
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 → SemanticsBinding
-
The current SemanticsBinding, if one has been created.
no setter