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Introduce new NavBackStackEntry#provideToCompositionLocals extension …
…that provides the NavBackStackEntry to the composition locals needed for all Compose-related navigators. Test: NavBackStackEntryProviderTest Fixes: b/187229439 Change-Id: If6af74ec67fbedef2cf5d623e9fc44ab6bf76e39
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159 changes: 159 additions & 0 deletions
159
...compose/src/androidTest/java/androidx/navigation/compose/NavBackStackEntryProviderTest.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| /* | ||
| * Copyright 2021 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package androidx.navigation.compose | ||
|
|
||
| import android.os.Bundle | ||
| import androidx.compose.runtime.DisposableEffect | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.saveable.SaveableStateHolder | ||
| import androidx.compose.runtime.saveable.rememberSaveable | ||
| import androidx.compose.runtime.saveable.rememberSaveableStateHolder | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.platform.LocalLifecycleOwner | ||
| import androidx.compose.ui.platform.LocalSavedStateRegistryOwner | ||
| import androidx.compose.ui.test.junit4.StateRestorationTester | ||
| import androidx.compose.ui.test.junit4.createComposeRule | ||
| import androidx.lifecycle.Lifecycle | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import androidx.lifecycle.ViewModelStoreOwner | ||
| import androidx.lifecycle.viewmodel.compose.LocalViewModelStoreOwner | ||
| import androidx.navigation.NavDestination | ||
| import androidx.navigation.NavigatorState | ||
| import androidx.navigation.testing.TestNavigatorState | ||
| import androidx.savedstate.SavedStateRegistryOwner | ||
| import androidx.test.ext.junit.runners.AndroidJUnit4 | ||
| import androidx.test.internal.runner.junit4.statement.UiThreadStatement.runOnUiThread | ||
| import androidx.testutils.TestNavigator | ||
| import com.google.common.truth.Truth.assertThat | ||
| import com.google.common.truth.Truth.assertWithMessage | ||
| import kotlinx.coroutines.runBlocking | ||
| import org.junit.Rule | ||
| import org.junit.Test | ||
| import org.junit.runner.RunWith | ||
| import kotlin.random.Random | ||
|
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| @RunWith(AndroidJUnit4::class) | ||
| class NavBackStackEntryProviderTest { | ||
|
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| @get:Rule | ||
| val composeTestRule = createComposeRule() | ||
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| @Test | ||
| fun testViewModelStoreOwnerProvided() { | ||
| val testNavigator = TestNavigator() | ||
| val testNavigatorState = TestNavigatorState() | ||
| val backStackEntry = testNavigatorState.createActiveBackStackEntry( | ||
| testNavigator.createDestination(), | ||
| null | ||
| ) | ||
| var viewModelStoreOwner: ViewModelStoreOwner? = null | ||
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| composeTestRule.setContent { | ||
| val saveableStateHolder = rememberSaveableStateHolder() | ||
| backStackEntry.provideToCompositionLocals(saveableStateHolder) { | ||
| viewModelStoreOwner = LocalViewModelStoreOwner.current | ||
| } | ||
| } | ||
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| assertWithMessage("ViewModelStoreOwner is provided by $backStackEntry") | ||
| .that(viewModelStoreOwner).isEqualTo(backStackEntry) | ||
| } | ||
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| @Test | ||
| fun testLifecycleOwnerProvided() { | ||
| val testNavigator = TestNavigator() | ||
| val navigatorState = TestNavigatorState() | ||
| val backStackEntry = | ||
| navigatorState.createActiveBackStackEntry(testNavigator.createDestination()) | ||
| var lifecycleOwner: LifecycleOwner? = null | ||
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| composeTestRule.setContent { | ||
| val saveableStateHolder = rememberSaveableStateHolder() | ||
| backStackEntry.provideToCompositionLocals(saveableStateHolder) { | ||
| lifecycleOwner = LocalLifecycleOwner.current | ||
| } | ||
| } | ||
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| assertWithMessage("LifecycleOwner is provided by $backStackEntry") | ||
| .that(lifecycleOwner).isEqualTo(backStackEntry) | ||
| } | ||
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| @Test | ||
| fun testLocalSavedStateRegistryOwnerProvided() { | ||
| val testNavigator = TestNavigator() | ||
| val navigatorState = TestNavigatorState() | ||
| val backStackEntry = | ||
| navigatorState.createActiveBackStackEntry(testNavigator.createDestination()) | ||
| var localSavedStateRegistryOwner: SavedStateRegistryOwner? = null | ||
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| composeTestRule.setContent { | ||
| val saveableStateHolder = rememberSaveableStateHolder() | ||
| backStackEntry.provideToCompositionLocals(saveableStateHolder) { | ||
| localSavedStateRegistryOwner = LocalSavedStateRegistryOwner.current | ||
| } | ||
| } | ||
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| assertWithMessage("LocalSavedStateRegistryOwner is provided by $backStackEntry") | ||
| .that(localSavedStateRegistryOwner).isEqualTo(backStackEntry) | ||
| } | ||
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| @Test | ||
| fun testSaveableValueInContentIsSaved() { | ||
| val restorationTester = StateRestorationTester(composeTestRule) | ||
| var array: IntArray? = null | ||
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| val testNavigator = TestNavigator() | ||
| val navigatorState = TestNavigatorState() | ||
| val backStackEntry = | ||
| navigatorState.createActiveBackStackEntry(testNavigator.createDestination()) | ||
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| restorationTester.setContent { | ||
| val saveableStateHolder = rememberSaveableStateHolder() | ||
| backStackEntry.provideToCompositionLocals(saveableStateHolder) { | ||
| array = rememberSaveable { | ||
| intArrayOf(0) | ||
| } | ||
| } | ||
| } | ||
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| assertThat(array).isEqualTo(intArrayOf(0)) | ||
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| composeTestRule.runOnUiThread { | ||
| array!![0] = 1 | ||
| // we null it to ensure recomposition happened | ||
| array = null | ||
| } | ||
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| restorationTester.emulateSavedInstanceStateRestore() | ||
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| assertThat(array).isEqualTo(intArrayOf(1)) | ||
| } | ||
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| // By default, NavBackStackEntrys are in the INITIALIZED state and then get moved to the next | ||
| // appropriate state by the NavController. In case we aren't testing with a NavController, | ||
| // this sets the entry's lifecycle state to the passed state so that the entry is active. | ||
| private fun NavigatorState.createActiveBackStackEntry( | ||
| destination: NavDestination, | ||
| arguments: Bundle? = null, | ||
| lifecycleState: Lifecycle.State = Lifecycle.State.RESUMED | ||
| ) = createBackStackEntry(destination, arguments).apply { | ||
| runOnUiThread { maxLifecycle = lifecycleState } | ||
| } | ||
|
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| } |
82 changes: 82 additions & 0 deletions
82
...navigation-compose/src/main/java/androidx/navigation/compose/NavBackStackEntryProvider.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * Copyright 2021 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package androidx.navigation.compose | ||
|
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| import android.annotation.SuppressLint | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.CompositionLocalProvider | ||
| import androidx.compose.runtime.saveable.SaveableStateHolder | ||
| import androidx.compose.ui.platform.LocalLifecycleOwner | ||
| import androidx.compose.ui.platform.LocalSavedStateRegistryOwner | ||
| import androidx.lifecycle.SavedStateHandle | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewmodel.compose.LocalViewModelStoreOwner | ||
| import androidx.lifecycle.viewmodel.compose.viewModel | ||
| import androidx.navigation.NavBackStackEntry | ||
| import java.util.UUID | ||
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| /** | ||
| * Provides [this] [NavBackStackEntry] as [LocalViewModelStoreOwner], [LocalLifecycleOwner] and | ||
| * [LocalSavedStateRegistryOwner] to the [content] and saves the [content]'s saveable states with | ||
| * the given [saveableStateHolder]. | ||
| * | ||
| * @param saveableStateHolder The [SaveableStateHolder] that holds the saved states | ||
| * @param content The content [Composable] | ||
| */ | ||
| @SuppressLint("ComposableNaming") | ||
| @Composable | ||
| public fun NavBackStackEntry.provideToCompositionLocals( | ||
| saveableStateHolder: SaveableStateHolder, | ||
| content: @Composable () -> Unit | ||
| ) { | ||
| CompositionLocalProvider( | ||
| LocalViewModelStoreOwner provides this, | ||
| LocalLifecycleOwner provides this, | ||
| LocalSavedStateRegistryOwner provides this | ||
| ) { | ||
| saveableStateHolder.SaveableStateProvider { | ||
| content() | ||
| } | ||
| } | ||
| } | ||
|
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| @Composable | ||
| private fun SaveableStateHolder.SaveableStateProvider(content: @Composable () -> Unit) { | ||
| val viewModel = viewModel<BackStackEntryIdViewModel>() | ||
| viewModel.saveableStateHolder = this | ||
| SaveableStateProvider(viewModel.id, content) | ||
| } | ||
|
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| internal class BackStackEntryIdViewModel(handle: SavedStateHandle) : ViewModel() { | ||
|
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| private val IdKey = "SaveableStateHolder_BackStackEntryKey" | ||
|
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| // we create our own id for each back stack entry to support multiple entries of the same | ||
| // destination. this id will be restored by SavedStateHandle | ||
| val id: UUID = handle.get<UUID>(IdKey) ?: UUID.randomUUID().also { handle.set(IdKey, it) } | ||
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| var saveableStateHolder: SaveableStateHolder? = null | ||
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| // onCleared will be called on the entries removed from the back stack. here we notify | ||
| // RestorableStateHolder that we shouldn't save the state for this id, so when we open this | ||
| // destination again the state will not be restored. | ||
| override fun onCleared() { | ||
| super.onCleared() | ||
| saveableStateHolder?.removeState(id) | ||
| } | ||
| } |
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