AndroidAmbients.kt
/*
* Copyright 2020 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.compose.ui.platform
import android.content.Context
import android.content.res.Configuration
import android.view.View
import androidx.compose.animation.core.InternalAnimationApi
import androidx.compose.animation.core.rootAnimationClockFactory
import androidx.compose.runtime.Composable
import androidx.compose.runtime.ExperimentalComposeApi
import androidx.compose.runtime.Providers
import androidx.compose.runtime.ambientOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.neverEqualPolicy
import androidx.compose.runtime.onDispose
import androidx.compose.runtime.remember
import androidx.compose.runtime.savedinstancestate.UiSavedStateRegistryAmbient
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticAmbientOf
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.ViewModelStoreOwner
/**
* The Android [Configuration]. The [Configuration] is useful for determining how to organize the
* UI.
*/
val ConfigurationAmbient = ambientOf<Configuration>(
@OptIn(ExperimentalComposeApi::class)
neverEqualPolicy()
)
/**
* Provides a [Context] that can be used by Android applications.
*/
val ContextAmbient = staticAmbientOf<Context>()
/**
* The ambient containing the current [LifecycleOwner].
*/
val LifecycleOwnerAmbient = staticAmbientOf<LifecycleOwner>()
/**
* The ambient containing the current Compose [View].
*/
val ViewAmbient = staticAmbientOf<View>()
/**
* The ambient containing the current [ViewModelStoreOwner].
*/
val ViewModelStoreOwnerAmbient = staticAmbientOf<ViewModelStoreOwner>()
@Composable
@OptIn(InternalAnimationApi::class)
internal fun ProvideAndroidAmbients(owner: AndroidOwner, content: @Composable () -> Unit) {
val view = owner.view
val context = view.context
val rootAnimationClock = remember { rootAnimationClockFactory() }
var configuration by remember {
mutableStateOf(
context.resources.configuration,
@OptIn(ExperimentalComposeApi::class)
neverEqualPolicy()
)
}
owner.configurationChangeObserver = { configuration = it }
val uriHandler = remember { AndroidUriHandler(context) }
val viewTreeOwners = owner.viewTreeOwners ?: throw IllegalStateException(
"Called when the ViewTreeOwnersAvailability is not yet in Available state"
)
val uiSavedStateRegistry = remember {
DisposableUiSavedStateRegistry(view, viewTreeOwners.savedStateRegistryOwner)
}
onDispose {
uiSavedStateRegistry.dispose()
}
Providers(
ConfigurationAmbient provides configuration,
ContextAmbient provides context,
LifecycleOwnerAmbient provides viewTreeOwners.lifecycleOwner,
UiSavedStateRegistryAmbient provides uiSavedStateRegistry,
ViewAmbient provides owner.view,
ViewModelStoreOwnerAmbient provides viewTreeOwners.viewModelStoreOwner
) {
ProvideCommonAmbients(
owner = owner,
animationClock = rootAnimationClock,
uriHandler = uriHandler,
content = content
)
}
}