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LobstersApp: replace with a BackgroundScaffold

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Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>
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Harsh Shandilya 2021-02-17 00:10:28 +05:30
parent d82228483d
commit be58017cac
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1 changed files with 49 additions and 88 deletions
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app/src/main/java/dev/msfjarvis/lobsters/ui/main/LobstersApp.kt
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@ -1,114 +1,75 @@
package dev.msfjarvis.lobsters.ui.main
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.material.BottomNavigation
import androidx.compose.material.BottomNavigationItem
import androidx.compose.material.Scaffold
import androidx.compose.material.BackdropScaffold
import androidx.compose.material.BackdropScaffoldDefaults
import androidx.compose.material.BackdropValue
import androidx.compose.material.Text
import androidx.compose.material.rememberBackdropScaffoldState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.sp
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.navigation.compose.KEY_ROUTE
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.navigate
import androidx.navigation.compose.rememberNavController
import androidx.paging.compose.collectAsLazyPagingItems
import dev.msfjarvis.lobsters.ui.navigation.Destination
import dev.msfjarvis.lobsters.R
import dev.msfjarvis.lobsters.ui.posts.HottestPosts
import dev.msfjarvis.lobsters.ui.posts.SavedPosts
import dev.msfjarvis.lobsters.ui.viewmodel.LobstersViewModel
import dev.msfjarvis.lobsters.util.IconResource
import kotlinx.coroutines.launch
@Composable
fun LobstersApp() {
val viewModel: LobstersViewModel = viewModel()
val coroutineScope = rememberCoroutineScope()
val navController = rememberNavController()
val scaffoldState = rememberBackdropScaffoldState(initialValue = BackdropValue.Concealed)
BackdropScaffold(
scaffoldState = scaffoldState,
gesturesEnabled = false,
appBar = {
Spacer(modifier = Modifier.height(BackdropScaffoldDefaults.PeekHeight.times(0.3f)))
Text(
text = stringResource(id = R.string.app_name),
textAlign = TextAlign.Center,
fontSize = 18.sp,
fontWeight = FontWeight.Bold,
modifier = Modifier.fillMaxWidth(),
)
Spacer(modifier = Modifier.height(BackdropScaffoldDefaults.PeekHeight.times(0.3f)))
},
backLayerContent = { BackgroundLayerContent(viewModel) },
) {
ForegroundLayerContent(viewModel)
}
}
@Composable
fun ForegroundLayerContent(
viewModel: LobstersViewModel,
) {
val hottestPosts = viewModel.posts.collectAsLazyPagingItems()
val savedPosts by viewModel.savedPosts.collectAsState()
val hottestPostsListState = rememberLazyListState()
val navBackStackEntry by navController.currentBackStackEntryAsState()
val currentRoute =
navBackStackEntry?.arguments?.getString(KEY_ROUTE) ?: Destination.startDestination.route
val currentDestination = Destination.getDestinationFromRoute(currentRoute)
val navigateToDestination: (destination: Destination) -> Unit = { destination ->
navController.navigate(destination.route) {
launchSingleTop = true
popUpTo(navController.graph.startDestination) { inclusive = false }
}
}
val jumpToIndex: (Int) -> Unit = {
coroutineScope.launch {
hottestPostsListState.snapToItemIndex(it)
}
}
Scaffold(
bottomBar = {
LobstersBottomNav(
currentDestination,
navigateToDestination,
jumpToIndex,
)
},
) { innerPadding ->
NavHost(navController, startDestination = Destination.startDestination.route) {
composable(Destination.Hottest.route) {
HottestPosts(
posts = hottestPosts,
listState = hottestPostsListState,
isPostSaved = viewModel::isPostSaved,
saveAction = viewModel::toggleSave,
modifier = Modifier.padding(bottom = innerPadding.calculateBottomPadding()),
)
}
composable(Destination.Saved.route) {
SavedPosts(
posts = savedPosts,
saveAction = viewModel::toggleSave,
modifier = Modifier.padding(bottom = innerPadding.calculateBottomPadding()),
)
}
}
}
HottestPosts(
posts = hottestPosts,
listState = hottestPostsListState,
isPostSaved = viewModel::isPostSaved,
saveAction = viewModel::toggleSave,
)
}
@Composable
fun LobstersBottomNav(
currentDestination: Destination,
navigateToDestination: (destination: Destination) -> Unit,
jumpToIndex: (index: Int) -> Unit,
fun BackgroundLayerContent(
viewModel: LobstersViewModel,
) {
BottomNavigation(modifier = Modifier.testTag("LobstersBottomNav")) {
Destination.values().forEach { screen ->
BottomNavigationItem(
icon = {
IconResource(
resourceId = screen.badgeRes,
contentDescription = stringResource(screen.labelRes),
)
},
label = { Text(stringResource(id = screen.labelRes)) },
selected = currentDestination == screen,
alwaysShowLabels = false,
onClick = {
if (screen != currentDestination) {
navigateToDestination(screen)
} else if (screen.route == Destination.Hottest.route) {
jumpToIndex(0)
}
}
)
}
}
val savedPosts by viewModel.savedPosts.collectAsState()
SavedPosts(
posts = savedPosts,
saveAction = viewModel::toggleSave,
)
}