SubjectEventChannel

SubjectEventChannel is a Dart class that extends Flutter's EventChannel to facilitate asynchronous communication between Flutter and platform-specific code using RxDart's Subject types. This class enables the management and broadcasting of events through various types of RxDart subjects, such as BehaviorSubject, ReplaySubject, and PublishSubject.

Overview

The SubjectEventChannel class is designed for efficient event handling and communication with platform-specific code. It leverages RxDart's subjects to offer flexible event management strategies, including buffering and replaying of events.

Constructors

SubjectEventChannel

const SubjectEventChannel(
  this.name,
  this.subject, {
  this.codec = const StandardMethodCodec(),
  this.maxSize,
  BinaryMessenger? binaryMessenger,
})

• Parameters:

Parameter	Type	Description
name	String	The name of the event channel used for communication with the platform.
subject	Subject	The RxDart Subject used for managing events. Can be BehaviorSubject, ReplaySubject, or PublishSubject.
codec	MethodCodec	Optional. Specifies how to encode and decode messages between Dart and the platform. Defaults to StandardMethodCodec().
maxSize	int?	Optional. For ReplaySubject, specifies the maximum number of events to retain. If null, no limit is applied.
binaryMessenger	BinaryMessenger?	Optional. The binary messenger for sending/receiving messages. If null, it defaults to the appropriate messenger based on runtime context.

SubjectEventChannel.behavior

SubjectEventChannel.behavior(
  this.name, {
  this.sync = false,
  this.codec = const StandardMethodCodec(),
  BinaryMessenger? binaryMessenger,
})

• Parameters:

Parameter	Type	Description
name	String	The name of the event channel used for communication with the platform.
sync	bool	Optional. Determines if the subject should be synchronous or asynchronous. Defaults to false.
codec	MethodCodec	Optional. Codec for encoding/decoding method calls.
binaryMessenger	BinaryMessenger?	Optional. The binary messenger for sending/receiving messages. If null, it defaults to the appropriate messenger based on runtime context.

SubjectEventChannel.replay

SubjectEventChannel.replay(
  this.name, {
  this.sync = false,
  this.maxSize,
  this.codec = const StandardMethodCodec(),
  BinaryMessenger? binaryMessenger,
})

• Parameters:

Parameter	Type	Description
name	String	The name of the event channel used for communication with the platform.
sync	bool	Optional. Determines if the subject should be synchronous or asynchronous. Defaults to false.
maxSize	int?	Optional. The buffer size for storing old events in ReplaySubject.
codec	MethodCodec	Optional. Codec for encoding/decoding method calls.
binaryMessenger	BinaryMessenger?	Optional. The binary messenger for sending/receiving messages. If null, it defaults to the appropriate messenger based on runtime context.

SubjectEventChannel.publish

SubjectEventChannel.publish(
  this.name, {
  this.sync = false,
  this.codec = const StandardMethodCodec(),
  BinaryMessenger? binaryMessenger,
})

• Parameters:

Parameter	Type	Description
name	String	The name of the event channel used for communication with the platform.
sync	bool	Optional. Determines if the subject should be synchronous or asynchronous. Defaults to false.
codec	MethodCodec	Optional. Codec for encoding/decoding method calls.
binaryMessenger	BinaryMessenger?	Optional. The binary messenger for sending/receiving messages. If null, it defaults to the appropriate messenger based on runtime context.

Bring your own subject:

You can supply a custom implementation of subject class by simply using default constructor:

final subject = XYSubject();
final eventChannel = SubjectEventChannel('name', subject);

Usage Example

see example_plugin project for more comprehensive example .

License

This project is licensed under the MIT License. See the LICENSE file for details.

Contributing

If you would like to contribute to this project, please fork the repository and submit a pull request with your changes. For major changes, please open an issue first to discuss what you would like to change.

TODO:

• x Testing.
• Improve documentation.
• publish to pub.dev.