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51 changes: 0 additions & 51 deletions
51
...tivestate-compose/src/androidMain/kotlin/com/ensody/reactivestate/compose/ViewModelExt.kt
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90 changes: 90 additions & 0 deletions
90
...tivestate-compose/src/composeMain/kotlin/com/ensody/reactivestate/compose/ViewModelExt.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package com.ensody.reactivestate.compose | ||
|
|
||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.mutableStateMapOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.saveable.rememberSaveable | ||
| import androidx.compose.runtime.snapshots.SnapshotStateMap | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.ViewModelStoreOwner | ||
| import androidx.lifecycle.viewModelScope | ||
| import androidx.lifecycle.viewmodel.compose.LocalViewModelStoreOwner | ||
| import androidx.lifecycle.viewmodel.compose.viewModel | ||
| import com.ensody.reactivestate.ErrorEvents | ||
| import com.ensody.reactivestate.ExperimentalReactiveStateApi | ||
| import com.ensody.reactivestate.InMemoryStateFlowStore | ||
| import com.ensody.reactivestate.ReactiveState | ||
| import com.ensody.reactivestate.ReactiveStateContext | ||
| import com.ensody.reactivestate.ReactiveViewModel | ||
| import com.ensody.reactivestate.ReactiveViewModelContext | ||
| import com.ensody.reactivestate.handleEvents | ||
| import kotlinx.coroutines.CoroutineScope | ||
|
|
||
| /** | ||
| * Creates a multiplatform [ReactiveState] ViewModel and observes its [ReactiveState.eventNotifier]. | ||
| * | ||
| * The [provider] should instantiate the object directly. | ||
| */ | ||
| @ExperimentalReactiveStateApi | ||
| @Suppress("UNCHECKED_CAST") | ||
| @Composable | ||
| public inline fun <reified VM : ReactiveViewModel> ErrorEvents.reactiveViewModel( | ||
| key: String? = null, | ||
| crossinline observeLoadingEffect: @Composable (viewModel: VM) -> Unit, | ||
| crossinline provider: ReactiveViewModelContext.() -> VM, | ||
| ): VM = | ||
| reactiveState(key = key, observeLoadingEffect = observeLoadingEffect) { | ||
| ReactiveViewModelContext(this).provider() | ||
| } | ||
|
|
||
| /** | ||
| * Creates a multiplatform [ReactiveState] ViewModel and observes its [ReactiveState.eventNotifier]. | ||
| * | ||
| * The [provider] should instantiate the object directly. | ||
| */ | ||
| @ExperimentalReactiveStateApi | ||
| @Suppress("UNCHECKED_CAST") | ||
| @Composable | ||
| public inline fun <reified E : ErrorEvents, reified VM : ReactiveState<E>> E.reactiveState( | ||
| key: String? = null, | ||
| crossinline observeLoadingEffect: @Composable (viewModel: VM) -> Unit, | ||
| crossinline provider: ReactiveStateContext.() -> VM, | ||
| ): VM { | ||
| val viewModel = onViewModel(key = key, provider = provider) | ||
| observeLoadingEffect(viewModel) | ||
| LaunchedEffect(this, viewModel.eventNotifier) { | ||
| viewModel.eventNotifier.handleEvents(this@reactiveState) | ||
| } | ||
| return viewModel | ||
| } | ||
|
|
||
| /** | ||
| * Creates an object living on a wrapper [ViewModel]. This allows for building more flexible (e.g. nestable) ViewModels. | ||
| * | ||
| * The [provider] should instantiate the object directly. | ||
| * | ||
| * @see [reactiveState] if you want to instantiate a multiplatform [ReactiveState] ViewModel directly. | ||
| */ | ||
| @ExperimentalReactiveStateApi | ||
| @Composable | ||
| public inline fun <reified T : Any?> onViewModel( | ||
| viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) { | ||
| "No ViewModelStoreOwner was provided via LocalViewModelStoreOwner" | ||
| }, | ||
| key: String? = null, | ||
| crossinline provider: ReactiveStateContext.() -> T, | ||
| ): T { | ||
| // TODO: Use qualifiedName once JS supports it | ||
| val fullKey = (key ?: "") + ":onViewModel:${T::class.simpleName}" | ||
| val storage = rememberSaveable<SnapshotStateMap<String, Any?>> { mutableStateMapOf() } | ||
| val stateFlowStore = remember { InMemoryStateFlowStore(storage) } | ||
| return viewModel(viewModelStoreOwner = viewModelStoreOwner, key = fullKey) { | ||
| WrapperViewModel { scope -> ReactiveStateContext(scope, stateFlowStore).provider() } | ||
| }.value | ||
| } | ||
|
|
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| /** A wrapper ViewModel used to hold an arbitrary [value]. */ | ||
| public class WrapperViewModel<T : Any?>(provider: (CoroutineScope) -> T) : ViewModel() { | ||
| public val value: T = provider(viewModelScope) | ||
| } |
37 changes: 37 additions & 0 deletions
37
reactivestate-core/src/commonMain/kotlin/com/ensody/reactivestate/OneTimeEvent.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| package com.ensody.reactivestate | ||
|
|
||
| /** | ||
| * Simple synchronous one-time event. Once [trigger] is called, subsequent [observe] calls are triggered immediately. | ||
| * | ||
| * This is not a stream of multiple events. That's what `Channel` and `Flow` would be used for, instead. | ||
| * This kind of event can be activated exactly once and then it stays active forever. | ||
| */ | ||
| public interface OneTimeEvent<T> { | ||
| public fun observe(block: T.() -> Unit) | ||
| public fun unobserve(block: T.() -> Unit) | ||
| public fun trigger(source: T) | ||
| } | ||
|
|
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| public class DefaultOneTimeEvent<T> : OneTimeEvent<T> { | ||
| private var source: T? = null | ||
| private val observers: MutableList<T.() -> Unit> = mutableListOf() | ||
|
|
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| override fun observe(block: T.() -> Unit) { | ||
| source?.block() ?: observers.add(block) | ||
| } | ||
|
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| override fun unobserve(block: T.() -> Unit) { | ||
| observers.remove(block) | ||
| } | ||
|
|
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| override fun trigger(source: T) { | ||
| if (this.source == null) { | ||
| this.source = source | ||
| } | ||
|
|
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| observers.forEach { | ||
| it.invoke(source) | ||
| } | ||
| observers.clear() | ||
| } | ||
| } |
21 changes: 21 additions & 0 deletions
21
reactivestate-core/src/commonMain/kotlin/com/ensody/reactivestate/ReactiveStateContext.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package com.ensody.reactivestate | ||
|
|
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| import kotlinx.coroutines.CoroutineScope | ||
|
|
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| /** | ||
| * Contains all values which are part of the | ||
| */ | ||
| @ExperimentalReactiveStateApi | ||
| public interface ReactiveStateContext { | ||
| public val scope: CoroutineScope | ||
| public val stateFlowStore: StateFlowStore | ||
| } | ||
|
|
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| @ExperimentalReactiveStateApi | ||
| public fun ReactiveStateContext(scope: CoroutineScope, stateFlowStore: StateFlowStore): ReactiveStateContext = | ||
| DefaultReactiveStateContext(scope, stateFlowStore) | ||
|
|
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| private class DefaultReactiveStateContext( | ||
| override val scope: CoroutineScope, | ||
| override val stateFlowStore: StateFlowStore, | ||
| ) : ReactiveStateContext |
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