63 lines
2.0 KiB
Kotlin
63 lines
2.0 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
package org.mozilla.fenix.mvi
|
|
|
|
import androidx.fragment.app.Fragment
|
|
import androidx.lifecycle.ViewModel
|
|
import io.reactivex.Observable
|
|
import io.reactivex.Observer
|
|
import io.reactivex.android.schedulers.AndroidSchedulers
|
|
import io.reactivex.disposables.Disposable
|
|
import io.reactivex.schedulers.Schedulers
|
|
|
|
abstract class UIComponent<S : ViewState, A : Action, C : Change>(
|
|
protected val owner: Fragment,
|
|
protected val actionEmitter: Observer<A>,
|
|
protected val changesObservable: Observable<C>
|
|
) {
|
|
|
|
abstract var initialState: S
|
|
|
|
open val uiView: UIView<S, A, C> by lazy { initView() }
|
|
|
|
abstract fun initView(): UIView<S, A, C>
|
|
open fun getContainerId() = uiView.containerId
|
|
abstract fun render(): Observable<S>
|
|
}
|
|
|
|
open class UIComponentViewModel<S : ViewState, A : Action, C : Change>(
|
|
private val initialState: S,
|
|
val changesObservable: Observable<C>,
|
|
reducer: Reducer<S, C>
|
|
) : ViewModel() {
|
|
|
|
private val statesObservable: Observable<S> = internalRender(reducer)
|
|
private var statesDisposable: Disposable? = null
|
|
|
|
/**
|
|
* Render the ViewState to the View through the Reducer
|
|
*/
|
|
fun render(uiView: UIView<S, A, C>): Observable<S> {
|
|
statesDisposable = statesObservable
|
|
.subscribe(uiView.updateView())
|
|
return statesObservable
|
|
}
|
|
|
|
@Suppress("MemberVisibilityCanBePrivate")
|
|
protected fun internalRender(reducer: Reducer<S, C>): Observable<S> =
|
|
changesObservable
|
|
.scan(initialState, reducer)
|
|
.distinctUntilChanged()
|
|
.subscribeOn(Schedulers.io())
|
|
.observeOn(AndroidSchedulers.mainThread())
|
|
.replay(1)
|
|
.autoConnect(0)
|
|
|
|
override fun onCleared() {
|
|
super.onCleared()
|
|
statesDisposable?.dispose()
|
|
}
|
|
}
|