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54 changes: 54 additions & 0 deletions
54
flutter-kmp/src/commonMain/kotlin/de/voize/flutterkmp/utils.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package de.voize.flutterkmp | ||
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| import kotlinx.serialization.KSerializer | ||
| import kotlinx.serialization.descriptors.SerialDescriptor | ||
| import kotlinx.serialization.descriptors.buildClassSerialDescriptor | ||
| import kotlinx.serialization.encoding.Decoder | ||
| import kotlinx.serialization.encoding.Encoder | ||
| import kotlinx.serialization.json.Json | ||
| import kotlinx.serialization.json.JsonArray | ||
| import kotlinx.serialization.json.JsonElement | ||
| import kotlinx.serialization.json.JsonEncoder | ||
| import kotlinx.serialization.json.JsonNull | ||
| import kotlinx.serialization.json.JsonObject | ||
| import kotlinx.serialization.json.JsonPrimitive | ||
| import kotlinx.serialization.modules.serializersModuleOf | ||
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|
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| internal class DynamicLookupSerializer : KSerializer<Any> { | ||
| override val descriptor: SerialDescriptor = buildClassSerialDescriptor("Any") | ||
|
|
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| override fun serialize(encoder: Encoder, value: Any) { | ||
| val jsonEncoder = encoder as JsonEncoder | ||
| val jsonElement = serializeAny(value) | ||
| jsonEncoder.encodeJsonElement(jsonElement) | ||
| } | ||
|
|
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| private fun serializeAny(value: Any?): JsonElement = when (value) { | ||
| null -> JsonNull | ||
| is Map<*, *> -> { | ||
| val mapContents = value.entries.associate { mapEntry -> | ||
| mapEntry.key.toString() to serializeAny(mapEntry.value) | ||
| } | ||
| JsonObject(mapContents) | ||
| } | ||
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|
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| is List<*> -> { | ||
| val arrayContents = value.map { listEntry -> serializeAny(listEntry) } | ||
| JsonArray(arrayContents) | ||
| } | ||
|
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| is Number -> JsonPrimitive(value) | ||
| is Boolean -> JsonPrimitive(value) | ||
| is String -> JsonPrimitive(value) | ||
| else -> error("Unsupported type ${value::class}") | ||
| } | ||
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| override fun deserialize(decoder: Decoder): Any { | ||
| error("Unsupported") | ||
| } | ||
| } | ||
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| internal val flowToFlutterJson = Json { | ||
| serializersModule = serializersModuleOf(DynamicLookupSerializer()) | ||
| encodeDefaults = true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package de.voize.flutterkmp | ||
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| import cocoapods.Flutter.FlutterError | ||
| import cocoapods.Flutter.FlutterEventSink | ||
| import kotlinx.coroutines.flow.Flow | ||
| import cocoapods.Flutter.FlutterStreamHandlerProtocol | ||
| import kotlinx.coroutines.CoroutineScope | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.Job | ||
| import kotlinx.coroutines.launch | ||
| import kotlinx.coroutines.withContext | ||
| import kotlinx.serialization.SerializationStrategy | ||
| import kotlinx.serialization.serializer | ||
| import platform.darwin.NSObject | ||
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| inline fun <reified T> Flow<T>.toEventStreamHandler(): NSObject = | ||
| toEventStreamHandler(serializer<T>()) | ||
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| fun <T> Flow<T>.toEventStreamHandler(serializer: SerializationStrategy<T>): NSObject { | ||
| return object : FlutterStreamHandlerProtocol, NSObject() { | ||
| var job: Job? = null | ||
|
|
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| override fun onListenWithArguments( | ||
| arguments: Any?, | ||
| eventSink: FlutterEventSink, | ||
| ): FlutterError? { | ||
| if (eventSink == null) { | ||
| return FlutterError.errorWithCode("no_event_sink", "No event sink available", null) | ||
| } | ||
|
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| job = CoroutineScope(Dispatchers.Default).launch { | ||
| this@toEventStreamHandler.collect { | ||
| withContext(Dispatchers.Main) { | ||
| eventSink(flowToFlutterJson.encodeToString(serializer, it)) | ||
| } | ||
| } | ||
| } | ||
| return null | ||
| } | ||
|
|
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| override fun onCancelWithArguments(arguments: Any?): FlutterError? { | ||
| job?.cancel() | ||
| job = null | ||
| return null | ||
| } | ||
| } | ||
| } |