Arkadii Ivanov
4 years ago
committed by
GitHub
13 changed files with 39 additions and 171 deletions
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/* |
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* Copied from Decompose |
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*/ |
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package example.todo.common.utils |
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import androidx.compose.runtime.Composable |
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import androidx.compose.runtime.Providers |
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import androidx.compose.runtime.onDispose |
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import androidx.compose.runtime.remember |
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import androidx.compose.runtime.savedinstancestate.UiSavedStateRegistry |
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import androidx.compose.runtime.savedinstancestate.UiSavedStateRegistryAmbient |
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import com.arkivanov.decompose.RouterState |
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import com.arkivanov.decompose.statekeeper.Parcelable |
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import com.arkivanov.decompose.value.Value |
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private typealias SavedState = Map<String, List<Any?>> |
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@Composable |
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fun <C : Parcelable, T : Any> Value<RouterState<C, T>>.children(render: @Composable() (child: T, configuration: C) -> Unit) { |
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val parentRegistry: UiSavedStateRegistry? = UiSavedStateRegistryAmbient.current |
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val children = remember(value) { Children<C>() } |
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if (parentRegistry != null) { |
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onDispose { |
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children.inactive.entries.forEach { (key, value) -> |
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parentRegistry.unregisterProvider(key, value.provider) |
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} |
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children.active?.also { |
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parentRegistry.unregisterProvider(it.key, it.provider) |
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} |
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} |
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} |
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observe { state -> |
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val activeChildConfiguration = state.activeChild.configuration |
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val currentChild: ActiveChild<C>? = children.active |
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if ((currentChild != null) && state.backStack.any { it.configuration === currentChild.configuration }) { |
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parentRegistry?.unregisterProvider(currentChild.key, currentChild.provider) |
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val inactiveChild = InactiveChild(configuration = currentChild.configuration, savedState = currentChild.provider()) |
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children.inactive[currentChild.key] = inactiveChild |
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parentRegistry?.registerProvider(currentChild.key, inactiveChild.provider) |
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} |
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val activeChildRegistry: UiSavedStateRegistry |
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if (currentChild?.configuration === activeChildConfiguration) { |
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activeChildRegistry = currentChild.registry |
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} else { |
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val key = activeChildConfiguration.toString() |
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val savedChild: InactiveChild<C>? = children.inactive.remove(key) |
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if (savedChild != null) { |
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parentRegistry?.unregisterProvider(key, savedChild.provider) |
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} |
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@Suppress("UNCHECKED_CAST") |
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val savedState: SavedState? = savedChild?.savedState ?: parentRegistry?.consumeRestored(key) as SavedState? |
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activeChildRegistry = UiSavedStateRegistry(savedState) { true } |
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val newActiveChild = ActiveChild(configuration = activeChildConfiguration, key = key, registry = activeChildRegistry) |
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children.active = newActiveChild |
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parentRegistry?.registerProvider(key, newActiveChild.provider) |
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} |
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children.inactive.entries.removeAll { (key, value) -> |
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val remove = state.backStack.none { it.configuration === value.configuration } |
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if (remove) { |
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parentRegistry?.unregisterProvider(key, value.provider) |
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} |
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remove |
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} |
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Providers(UiSavedStateRegistryAmbient provides activeChildRegistry) { |
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render(state.activeChild.component, activeChildConfiguration) |
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} |
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} |
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} |
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private class Children<C : Parcelable> { |
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val inactive: MutableMap<String, InactiveChild<C>> = HashMap() |
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var active: ActiveChild<C>? = null |
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} |
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private class ActiveChild<out C : Parcelable>( |
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val configuration: C, |
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val key: String, |
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val registry: UiSavedStateRegistry |
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) { |
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val provider: () -> SavedState = registry::performSave |
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} |
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private class InactiveChild<out C : Parcelable>( |
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val configuration: C, |
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val savedState: SavedState |
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) { |
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val provider: () -> SavedState = ::savedState |
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} |
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@ -1,34 +0,0 @@
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/* |
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* Copied from Decompose |
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*/ |
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package example.todo.common.utils |
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import androidx.compose.runtime.Composable |
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import androidx.compose.runtime.State |
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import androidx.compose.runtime.mutableStateOf |
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import androidx.compose.runtime.onDispose |
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import androidx.compose.runtime.remember |
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import com.arkivanov.decompose.value.Value |
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import com.arkivanov.decompose.value.ValueObserver |
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@Composable |
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fun <T : Any> Value<T>.asState(): State<T> { |
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val composeState = remember(this) { mutableStateOf(value) } |
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val observer = |
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remember(this) { |
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val observer: ValueObserver<T> = { composeState.value = it } |
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subscribe(observer) |
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observer |
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} |
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onDispose { unsubscribe(observer) } |
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return composeState |
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} |
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@Composable |
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fun <T : Any> Value<T>.observe(observer: @Composable() (T) -> Unit) { |
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observer(asState().value) |
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} |
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