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InterestsListDetailScreen.kt
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InterestsListDetailScreen.kt
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/*
* Copyright 2024 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
*
* https://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 com.google.samples.apps.nowinandroid.ui.interests2pane
import androidx.activity.compose.BackHandler
import androidx.compose.material3.adaptive.ExperimentalMaterial3AdaptiveApi
import androidx.compose.material3.adaptive.layout.AnimatedPane
import androidx.compose.material3.adaptive.layout.ListDetailPaneScaffold
import androidx.compose.material3.adaptive.layout.ListDetailPaneScaffoldRole
import androidx.compose.material3.adaptive.layout.PaneAdaptedValue
import androidx.compose.material3.adaptive.layout.ThreePaneScaffoldDestinationItem
import androidx.compose.material3.adaptive.navigation.ThreePaneScaffoldNavigator
import androidx.compose.material3.adaptive.navigation.rememberListDetailPaneScaffoldNavigator
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.hilt.navigation.compose.hiltViewModel
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.navigation.NavGraphBuilder
import androidx.navigation.NavType
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import androidx.navigation.navArgument
import com.google.samples.apps.nowinandroid.feature.interests.InterestsRoute
import com.google.samples.apps.nowinandroid.feature.interests.navigation.INTERESTS_ROUTE
import com.google.samples.apps.nowinandroid.feature.interests.navigation.TOPIC_ID_ARG
import com.google.samples.apps.nowinandroid.feature.topic.TopicDetailPlaceholder
import com.google.samples.apps.nowinandroid.feature.topic.navigation.TOPIC_ROUTE
import com.google.samples.apps.nowinandroid.feature.topic.navigation.createTopicRoute
import com.google.samples.apps.nowinandroid.feature.topic.navigation.navigateToTopic
import com.google.samples.apps.nowinandroid.feature.topic.navigation.topicScreen
import java.util.UUID
private const val DETAIL_PANE_NAVHOST_ROUTE = "detail_pane_route"
fun NavGraphBuilder.interestsListDetailScreen() {
composable(
route = INTERESTS_ROUTE,
arguments = listOf(
navArgument(TOPIC_ID_ARG) {
type = NavType.StringType
defaultValue = null
nullable = true
},
),
) {
InterestsListDetailScreen()
}
}
@Composable
internal fun InterestsListDetailScreen(
viewModel: Interests2PaneViewModel = hiltViewModel(),
) {
val selectedTopicId by viewModel.selectedTopicId.collectAsStateWithLifecycle()
InterestsListDetailScreen(
selectedTopicId = selectedTopicId,
onTopicClick = viewModel::onTopicClick,
)
}
@OptIn(ExperimentalMaterial3AdaptiveApi::class)
@Composable
internal fun InterestsListDetailScreen(
selectedTopicId: String?,
onTopicClick: (String) -> Unit,
) {
val listDetailNavigator = rememberListDetailPaneScaffoldNavigator(
initialDestinationHistory = listOfNotNull(
ThreePaneScaffoldDestinationItem(ListDetailPaneScaffoldRole.List),
ThreePaneScaffoldDestinationItem<Nothing>(ListDetailPaneScaffoldRole.Detail).takeIf {
selectedTopicId != null
},
),
)
BackHandler(listDetailNavigator.canNavigateBack()) {
listDetailNavigator.navigateBack()
}
var nestedNavHostStartDestination by remember {
mutableStateOf(selectedTopicId?.let(::createTopicRoute) ?: TOPIC_ROUTE)
}
var nestedNavKey by remember { mutableStateOf(UUID.randomUUID()) }
val nestedNavController = key(nestedNavKey) {
rememberNavController()
}
fun onTopicClickShowDetailPane(topicId: String) {
onTopicClick(topicId)
if (listDetailNavigator.isDetailPaneVisible()) {
// If the detail pane was visible, then use the nestedNavController navigate call
// directly
nestedNavController.navigateToTopic(topicId) {
popUpTo(DETAIL_PANE_NAVHOST_ROUTE)
}
} else {
// Otherwise, recreate the NavHost entirely, and start at the new destination
nestedNavHostStartDestination = createTopicRoute(topicId)
nestedNavKey = UUID.randomUUID()
}
listDetailNavigator.navigateTo(ListDetailPaneScaffoldRole.Detail)
}
ListDetailPaneScaffold(
value = listDetailNavigator.scaffoldValue,
directive = listDetailNavigator.scaffoldDirective,
listPane = {
AnimatedPane {
InterestsRoute(
onTopicClick = ::onTopicClickShowDetailPane,
highlightSelectedTopic = listDetailNavigator.isDetailPaneVisible(),
)
}
},
detailPane = {
AnimatedPane {
key(nestedNavKey) {
NavHost(
navController = nestedNavController,
startDestination = nestedNavHostStartDestination,
route = DETAIL_PANE_NAVHOST_ROUTE,
) {
topicScreen(
showBackButton = !listDetailNavigator.isListPaneVisible(),
onBackClick = listDetailNavigator::navigateBack,
onTopicClick = ::onTopicClickShowDetailPane,
)
composable(route = TOPIC_ROUTE) {
TopicDetailPlaceholder()
}
}
}
}
},
)
}
@OptIn(ExperimentalMaterial3AdaptiveApi::class)
private fun <T> ThreePaneScaffoldNavigator<T>.isListPaneVisible(): Boolean =
scaffoldValue[ListDetailPaneScaffoldRole.List] == PaneAdaptedValue.Expanded
@OptIn(ExperimentalMaterial3AdaptiveApi::class)
private fun <T> ThreePaneScaffoldNavigator<T>.isDetailPaneVisible(): Boolean =
scaffoldValue[ListDetailPaneScaffoldRole.Detail] == PaneAdaptedValue.Expanded