PluginEventChannel<T> class
Null safety
A named channel for sending events to the framework-side using streams.
This is the platform-side equivalent of EventChannel. Whereas EventChannel receives a stream of events from platform plugins, this channel sends a stream of events to the handler listening on the framework-side.
The channel name must not be null. If no codec is provided, then StandardMethodCodec is used. If no binaryMessenger is provided, then pluginBinaryMessenger, which sends messages to the framework-side, is used.
Channels created using this class implement two methods for subscribing to the event stream. The methods use the encoding of the specified codec.
The first method is listen. When called, it begins forwarding
messages to the framework side when they are added to the
controller. This triggers the StreamController.onListen callback
on the controller.
The other method is cancel. When called, it stops forwarding
events to the framework. This triggers the StreamController.onCancel
callback on the controller.
Events added to the controller when the framework is not
subscribed are silently discarded.
Constructors
- PluginEventChannel(String name, [MethodCodec codec, BinaryMessenger? binaryMessenger])
-
Creates a new plugin event channel. [...]
const
Properties
- binaryMessenger → BinaryMessenger?
-
The messenger used by this channel to send platform messages. [...]
final
- codec → MethodCodec
-
The message codec used by this channel. [...]
final
-
controller
← StreamController<
T> -
Use setController instead. [...]
@Deprecated('Replace calls to the "controller" setter with calls to the "setController" method. ' 'This feature was deprecated after v1.23.0-7.0.pre.'), write-only
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- name → String
-
The logical channel on which communication happens. [...]
final
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
-
setController(
StreamController< T> ? controller) → void - Changes the stream controller for this event channel. [...]
-
toString(
) → String -
A string representation of this object. [...]
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator. [...]
inherited