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87 changes: 87 additions & 0 deletions
87
...viewmodel/src/main/java/com/alexdeww/reactiveviewmodel/core/property/ConfirmationEvent.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package com.alexdeww.reactiveviewmodel.core.property | ||
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| import androidx.annotation.MainThread | ||
| import androidx.collection.ArraySet | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import androidx.lifecycle.LiveData | ||
| import androidx.lifecycle.MediatorLiveData | ||
| import androidx.lifecycle.Observer | ||
| import com.alexdeww.reactiveviewmodel.core.property.ConfirmationEvent.ObserverWrapper | ||
| import io.reactivex.rxjava3.core.Flowable | ||
| import io.reactivex.rxjava3.core.Observable | ||
| import io.reactivex.rxjava3.functions.Consumer | ||
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| class ConfirmationEvent<T : Any> internal constructor(debounceInterval: Long? = null) { | ||
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| private sealed class EventType { | ||
| data class Pending(val data: Any) : EventType() | ||
| object Confirmed : EventType() | ||
| } | ||
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| private val eventState = State<EventType>(EventType.Confirmed, debounceInterval) | ||
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| internal val consumer: Consumer<T> = Consumer { | ||
| eventState.consumer.accept(EventType.Pending(it)) | ||
| } | ||
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| @Suppress("UNCHECKED_CAST") | ||
| internal val observable: Observable<T> = eventState.observable | ||
| .ofType(EventType.Pending::class.java) | ||
| .map { it.data as T } | ||
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| val liveData: LiveData<T> by lazy { ConfirmationEventLiveData() } | ||
| val viewFlowable: Flowable<T> by lazy { observable.toViewFlowable() } | ||
| val isConfirmed: Boolean get() = eventState.value === EventType.Confirmed | ||
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| fun confirm() { | ||
| eventState.consumer.accept(EventType.Confirmed) | ||
| } | ||
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| private inner class ConfirmationEventLiveData : MediatorLiveData<T>() { | ||
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| private val observers = ArraySet<ConfirmationEvent.ObserverWrapper<T>>() | ||
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| @MainThread | ||
| override fun observe(owner: LifecycleOwner, observer: Observer<in T>) { | ||
| val wrapper = ObserverWrapper(observer) | ||
| observers.add(wrapper) | ||
| super.observe(owner, wrapper) | ||
| } | ||
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| @MainThread | ||
| override fun removeObserver(observer: Observer<in T>) { | ||
| if (observers.remove(observer as Observer<*>)) { | ||
| super.removeObserver(observer) | ||
| return | ||
| } | ||
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| val iterator = observers.iterator() | ||
| while (iterator.hasNext()) { | ||
| val wrapper = iterator.next() | ||
| if (wrapper.observer == observer) { | ||
| iterator.remove() | ||
| super.removeObserver(observer) | ||
| break | ||
| } | ||
| } | ||
| } | ||
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| @Suppress("UNCHECKED_CAST") | ||
| override fun onActive() { | ||
| super.onActive() | ||
| addSource(eventState.liveData) { value = (it as? EventType.Pending)?.data as T } | ||
| } | ||
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| override fun onInactive() { | ||
| removeSource(eventState.liveData) | ||
| super.onInactive() | ||
| } | ||
| } | ||
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| private class ObserverWrapper<T>(val observer: Observer<in T>) : Observer<T> { | ||
| override fun onChanged(t: T?) { | ||
| if (t != null) observer.onChanged(t) | ||
| } | ||
| } | ||
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|
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| } |