LocalViewModelStoreOwner.kt
/*
* 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.lifecycle.viewmodel.compose
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.ProvidedValue
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.ui.platform.LocalView
import androidx.lifecycle.ViewModelStoreOwner
import androidx.lifecycle.findViewTreeViewModelStoreOwner
/**
* The CompositionLocal containing the current [ViewModelStoreOwner].
*/
public object LocalViewModelStoreOwner {
private val LocalViewModelStoreOwner =
compositionLocalOf<ViewModelStoreOwner?> { null }
/**
* Returns current composition local value for the owner or `null` if one has not
* been provided nor is one available via [findViewTreeViewModelStoreOwner] on the
* current [LocalView].
*/
public val current: ViewModelStoreOwner?
@Composable
get() = LocalViewModelStoreOwner.current
?: LocalView.current.findViewTreeViewModelStoreOwner()
/**
* Associates a [LocalViewModelStoreOwner] key to a value in a call to
* [CompositionLocalProvider].
*/
public infix fun provides(viewModelStoreOwner: ViewModelStoreOwner):
ProvidedValue<ViewModelStoreOwner?> {
return LocalViewModelStoreOwner.provides(viewModelStoreOwner)
}
}