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| 1 | +// |
| 2 | +// BaseListenerWrapper.swift |
| 3 | +// qonversion_flutter |
| 4 | +// |
| 5 | +// Created by Ilya Virnik on 2/7/21. |
| 6 | +// |
| 7 | + |
| 8 | +#if canImport(FlutterMacOS) |
| 9 | +import FlutterMacOS |
| 10 | +#else |
| 11 | +import Flutter |
| 12 | +#endif |
| 13 | + |
| 14 | +typealias MethodCodec = NSObject & FlutterMethodCodec |
| 15 | + |
| 16 | +class FlutterListenerWrapper<T>: NSObject where T: EventStreamHandler { |
| 17 | + let binding: FlutterPluginRegistrar |
| 18 | + let eventChannelPostfix: String |
| 19 | + |
| 20 | + var eventChannel: FlutterEventChannel? |
| 21 | + var eventStreamHandler: T? |
| 22 | + |
| 23 | + init(_ binding: FlutterPluginRegistrar, postfix: String) { |
| 24 | + self.binding = binding |
| 25 | + self.eventChannelPostfix = postfix |
| 26 | + } |
| 27 | + |
| 28 | + func register(_ codec: MethodCodec? = nil, completion: ((T?) -> Void)? = nil) { |
| 29 | + guard eventStreamHandler == nil else { |
| 30 | + return |
| 31 | + } |
| 32 | + |
| 33 | + let messenger: FlutterBinaryMessenger |
| 34 | + #if canImport(FlutterMacOS) |
| 35 | + messenger = binding.messenger |
| 36 | + #else |
| 37 | + messenger = binding.messenger() |
| 38 | + #endif |
| 39 | + |
| 40 | + eventStreamHandler = T() |
| 41 | + if let codec = codec { |
| 42 | + eventChannel = FlutterEventChannel(name: "qonversion_flutter_\(eventChannelPostfix)", |
| 43 | + binaryMessenger: messenger, |
| 44 | + codec: codec) |
| 45 | + } else { |
| 46 | + eventChannel = FlutterEventChannel(name: "qonversion_flutter_\(eventChannelPostfix)", |
| 47 | + binaryMessenger: messenger) |
| 48 | + } |
| 49 | + |
| 50 | + eventChannel?.setStreamHandler(eventStreamHandler) |
| 51 | + |
| 52 | + completion?(eventStreamHandler) |
| 53 | + } |
| 54 | + |
| 55 | + func unregister() { |
| 56 | + eventChannel?.setStreamHandler(nil) |
| 57 | + eventStreamHandler = nil |
| 58 | + eventChannel = nil |
| 59 | + } |
| 60 | +} |
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