/
NiaAppState.kt
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/
NiaAppState.kt
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/*
* Copyright 2022 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
import androidx.compose.material3.windowsizeclass.WindowSizeClass
import androidx.compose.material3.windowsizeclass.WindowWidthSizeClass
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.navigation.NavController
import androidx.navigation.NavDestination
import androidx.navigation.NavGraph.Companion.findStartDestination
import androidx.navigation.NavHostController
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.rememberNavController
import androidx.navigation.navOptions
import androidx.tracing.trace
import com.google.samples.apps.nowinandroid.core.data.repository.UserNewsResourceRepository
import com.google.samples.apps.nowinandroid.core.data.util.NetworkMonitor
import com.google.samples.apps.nowinandroid.core.data.util.TimeZoneMonitor
import com.google.samples.apps.nowinandroid.core.ui.TrackDisposableJank
import com.google.samples.apps.nowinandroid.feature.bookmarks.navigation.BOOKMARKS_ROUTE
import com.google.samples.apps.nowinandroid.feature.bookmarks.navigation.navigateToBookmarks
import com.google.samples.apps.nowinandroid.feature.foryou.navigation.FOR_YOU_ROUTE
import com.google.samples.apps.nowinandroid.feature.foryou.navigation.navigateToForYou
import com.google.samples.apps.nowinandroid.feature.interests.navigation.INTERESTS_ROUTE
import com.google.samples.apps.nowinandroid.feature.interests.navigation.navigateToInterests
import com.google.samples.apps.nowinandroid.feature.search.navigation.navigateToSearch
import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination
import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.BOOKMARKS
import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.FOR_YOU
import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.INTERESTS
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.combine
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.flow.stateIn
import kotlinx.datetime.TimeZone
@Composable
fun rememberNiaAppState(
windowSizeClass: WindowSizeClass,
networkMonitor: NetworkMonitor,
userNewsResourceRepository: UserNewsResourceRepository,
timeZoneMonitor: TimeZoneMonitor,
coroutineScope: CoroutineScope = rememberCoroutineScope(),
navController: NavHostController = rememberNavController(),
): NiaAppState {
NavigationTrackingSideEffect(navController)
return remember(
navController,
coroutineScope,
windowSizeClass,
networkMonitor,
userNewsResourceRepository,
timeZoneMonitor,
) {
NiaAppState(
navController = navController,
coroutineScope = coroutineScope,
windowSizeClass = windowSizeClass,
networkMonitor = networkMonitor,
userNewsResourceRepository = userNewsResourceRepository,
timeZoneMonitor = timeZoneMonitor,
)
}
}
@Stable
class NiaAppState(
val navController: NavHostController,
coroutineScope: CoroutineScope,
val windowSizeClass: WindowSizeClass,
networkMonitor: NetworkMonitor,
userNewsResourceRepository: UserNewsResourceRepository,
timeZoneMonitor: TimeZoneMonitor,
) {
val currentDestination: NavDestination?
@Composable get() = navController
.currentBackStackEntryAsState().value?.destination
val currentTopLevelDestination: TopLevelDestination?
@Composable get() = when (currentDestination?.route) {
FOR_YOU_ROUTE -> FOR_YOU
BOOKMARKS_ROUTE -> BOOKMARKS
INTERESTS_ROUTE -> INTERESTS
else -> null
}
val shouldShowBottomBar: Boolean
get() = windowSizeClass.widthSizeClass == WindowWidthSizeClass.Compact
val shouldShowNavRail: Boolean
get() = !shouldShowBottomBar
val isOffline = networkMonitor.isOnline
.map(Boolean::not)
.stateIn(
scope = coroutineScope,
started = SharingStarted.WhileSubscribed(5_000),
initialValue = false,
)
/**
* Map of top level destinations to be used in the TopBar, BottomBar and NavRail. The key is the
* route.
*/
val topLevelDestinations: List<TopLevelDestination> = TopLevelDestination.entries
/**
* The top level destinations that have unread news resources.
*/
val topLevelDestinationsWithUnreadResources: StateFlow<Set<TopLevelDestination>> =
userNewsResourceRepository.observeAllForFollowedTopics()
.combine(userNewsResourceRepository.observeAllBookmarked()) { forYouNewsResources, bookmarkedNewsResources ->
setOfNotNull(
FOR_YOU.takeIf { forYouNewsResources.any { !it.hasBeenViewed } },
BOOKMARKS.takeIf { bookmarkedNewsResources.any { !it.hasBeenViewed } },
)
}
.stateIn(
coroutineScope,
SharingStarted.WhileSubscribed(5_000),
initialValue = emptySet(),
)
val currentTimeZone = timeZoneMonitor.currentTimeZone
.stateIn(
coroutineScope,
SharingStarted.WhileSubscribed(5_000),
TimeZone.currentSystemDefault(),
)
/**
* UI logic for navigating to a top level destination in the app. Top level destinations have
* only one copy of the destination of the back stack, and save and restore state whenever you
* navigate to and from it.
*
* @param topLevelDestination: The destination the app needs to navigate to.
*/
fun navigateToTopLevelDestination(topLevelDestination: TopLevelDestination) {
trace("Navigation: ${topLevelDestination.name}") {
val topLevelNavOptions = navOptions {
// Pop up to the start destination of the graph to
// avoid building up a large stack of destinations
// on the back stack as users select items
popUpTo(navController.graph.findStartDestination().id) {
saveState = true
}
// Avoid multiple copies of the same destination when
// reselecting the same item
launchSingleTop = true
// Restore state when reselecting a previously selected item
restoreState = true
}
when (topLevelDestination) {
FOR_YOU -> navController.navigateToForYou(topLevelNavOptions)
BOOKMARKS -> navController.navigateToBookmarks(topLevelNavOptions)
INTERESTS -> navController.navigateToInterests(null, topLevelNavOptions)
}
}
}
fun navigateToSearch() = navController.navigateToSearch()
}
/**
* Stores information about navigation events to be used with JankStats
*/
@Composable
private fun NavigationTrackingSideEffect(navController: NavHostController) {
TrackDisposableJank(navController) { metricsHolder ->
val listener = NavController.OnDestinationChangedListener { _, destination, _ ->
metricsHolder.state?.putState("Navigation", destination.route.toString())
}
navController.addOnDestinationChangedListener(listener)
onDispose {
navController.removeOnDestinationChangedListener(listener)
}
}
}