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@ -28,19 +28,16 @@ import androidx.navigation.NavGraph.Companion.findStartDestination
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import androidx.navigation.NavHostController
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import androidx.navigation.compose.currentBackStackEntryAsState
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import androidx.navigation.compose.rememberNavController
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import androidx.navigation.navOptions
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import androidx.tracing.trace
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import com.google.samples.apps.nowinandroid.core.designsystem.icon.Icon.DrawableResourceIcon
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import com.google.samples.apps.nowinandroid.core.designsystem.icon.Icon.ImageVectorIcon
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import com.google.samples.apps.nowinandroid.core.designsystem.icon.NiaIcons
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import com.google.samples.apps.nowinandroid.core.navigation.NiaNavigationDestination
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import com.google.samples.apps.nowinandroid.core.ui.TrackDisposableJank
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import com.google.samples.apps.nowinandroid.feature.bookmarks.R as bookmarksR
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import com.google.samples.apps.nowinandroid.feature.bookmarks.navigation.BookmarksDestination
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import com.google.samples.apps.nowinandroid.feature.foryou.R as forYouR
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import com.google.samples.apps.nowinandroid.feature.foryou.navigation.ForYouDestination
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import com.google.samples.apps.nowinandroid.feature.interests.R as interestsR
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import com.google.samples.apps.nowinandroid.feature.interests.navigation.InterestsDestination
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import com.google.samples.apps.nowinandroid.feature.bookmarks.navigation.navigateToBookmarks
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import com.google.samples.apps.nowinandroid.feature.foryou.navigation.navigateToForYou
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import com.google.samples.apps.nowinandroid.feature.interests.navigation.navigateToInterestsGraph
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import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination
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import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.BOOKMARKS
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import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.FOR_YOU
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import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.INTERESTS
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@Composable
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fun rememberNiaAppState(
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@ -72,61 +69,35 @@ class NiaAppState(
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/**
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* Top level destinations to be used in the BottomBar and NavRail
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*/
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val topLevelDestinations: List<TopLevelDestination> = listOf(
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TopLevelDestination(
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route = ForYouDestination.route,
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destination = ForYouDestination.destination,
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selectedIcon = DrawableResourceIcon(NiaIcons.Upcoming),
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unselectedIcon = DrawableResourceIcon(NiaIcons.UpcomingBorder),
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iconTextId = forYouR.string.for_you
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),
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TopLevelDestination(
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route = BookmarksDestination.route,
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destination = BookmarksDestination.destination,
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selectedIcon = DrawableResourceIcon(NiaIcons.Bookmarks),
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unselectedIcon = DrawableResourceIcon(NiaIcons.BookmarksBorder),
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iconTextId = bookmarksR.string.saved
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),
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TopLevelDestination(
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route = InterestsDestination.route,
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destination = InterestsDestination.destination,
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selectedIcon = ImageVectorIcon(NiaIcons.Grid3x3),
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unselectedIcon = ImageVectorIcon(NiaIcons.Grid3x3),
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iconTextId = interestsR.string.interests
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)
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)
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val topLevelDestinations: List<TopLevelDestination> = TopLevelDestination.values().asList()
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/**
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* UI logic for navigating to a particular destination in the app. The NavigationOptions to
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* navigate with are based on the type of destination, which could be a top level destination or
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* just a regular destination.
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* UI logic for navigating to a top level destination in the app. Top level destinations have
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* only one copy of the destination of the back stack, and save and restore state whenever you
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* navigate to and from it.
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*
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* Top level destinations have only one copy of the destination of the back stack, and save and
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* restore state whenever you navigate to and from it.
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* Regular destinations can have multiple copies in the back stack and state isn't saved nor
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* restored.
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*
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* @param destination: The [NiaNavigationDestination] the app needs to navigate to.
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* @param route: Optional route to navigate to in case the destination contains arguments.
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* @param topLevelDestination: The destination the app needs to navigate to.
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*/
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fun navigate(destination: NiaNavigationDestination, route: String? = null) {
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trace("Navigation: ${destination.route}") {
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if (destination is TopLevelDestination) {
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navController.navigate(route ?: destination.route) {
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// Pop up to the start destination of the graph to
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// avoid building up a large stack of destinations
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// on the back stack as users select items
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popUpTo(navController.graph.findStartDestination().id) {
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saveState = true
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}
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// Avoid multiple copies of the same destination when
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// reselecting the same item
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launchSingleTop = true
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// Restore state when reselecting a previously selected item
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restoreState = true
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fun navigateToTopLevelDestination(topLevelDestination: TopLevelDestination) {
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trace("Navigation: ${topLevelDestination.name}") {
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val topLevelNavOptions = navOptions {
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// Pop up to the start destination of the graph to
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// avoid building up a large stack of destinations
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// on the back stack as users select items
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popUpTo(navController.graph.findStartDestination().id) {
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saveState = true
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}
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} else {
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navController.navigate(route ?: destination.route)
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// Avoid multiple copies of the same destination when
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// reselecting the same item
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launchSingleTop = true
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// Restore state when reselecting a previously selected item
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restoreState = true
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}
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when (topLevelDestination) {
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FOR_YOU -> navController.navigateToForYou(topLevelNavOptions)
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BOOKMARKS -> navController.navigateToBookmarks(topLevelNavOptions)
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INTERESTS -> navController.navigateToInterestsGraph(topLevelNavOptions)
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}
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}
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}
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Manuel Vivo
2 years ago