DialogHost.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.navigation.compose
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.saveable.rememberSaveableStateHolder
import androidx.compose.ui.window.Dialog
import androidx.lifecycle.Lifecycle
import androidx.navigation.compose.DialogNavigator.Destination
/**
* Show each [Destination] on the [DialogNavigator]'s back stack as a [Dialog].
*
* Note that [NavHost] will call this for you; you do not need to call it manually.
*/
@Composable
public fun DialogHost(dialogNavigator: DialogNavigator) {
val saveableStateHolder = rememberSaveableStateHolder()
val dialogBackStack by dialogNavigator.backStack.collectAsState()
dialogBackStack.filter { backStackEntry ->
backStackEntry.lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)
}.forEach { backStackEntry ->
val destination = backStackEntry.destination as Destination
Dialog(
onDismissRequest = { dialogNavigator.dismiss(backStackEntry) },
properties = destination.dialogProperties
) {
// while in the scope of the composable, we provide the navBackStackEntry as the
// ViewModelStoreOwner and LifecycleOwner
backStackEntry.LocalOwnersProvider(saveableStateHolder) {
destination.content(backStackEntry)
}
}
}
}