feat: Request focus on search bar and consume back press to close before exit

app/src/main/java/com/starry/greenstash/ui/screens/home/HomeViewModel.kt

@@ -43,7 +43,7 @@ import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
-enum class SearchWidgetState { OPENED, CLOSED }
+enum class SearchBarState { OPENED, CLOSED }
 enum class FilterField { Title, Amount, Priority }
 enum class FilterSortType(val value: Int) { Ascending(1), Descending(2) }
 enum class GoalCardStyle { Classic, Compact }
@@ -97,9 +97,9 @@ class HomeViewModel @Inject constructor(
     }
     val goalsList = goalsListFlow.asLiveData()
 
-    private val _searchWidgetState: MutableState<SearchWidgetState> =
-        mutableStateOf(value = SearchWidgetState.CLOSED)
-    val searchWidgetState: State<SearchWidgetState> = _searchWidgetState
+    private val _searchBarState: MutableState<SearchBarState> =
+        mutableStateOf(value = SearchBarState.CLOSED)
+    val searchBarState: State<SearchBarState> = _searchBarState
 
     private val _searchTextState: MutableState<String> = mutableStateOf(value = "")
     val searchTextState: State<String> = _searchTextState
@@ -112,8 +112,8 @@ class HomeViewModel @Inject constructor(
     )
     val showOnboardingTapTargets: State<Boolean> = _showOnboardingTapTargets
 
-    fun updateSearchWidgetState(newValue: SearchWidgetState) {
-        _searchWidgetState.value = newValue
+    fun updateSearchWidgetState(newValue: SearchBarState) {
+        _searchBarState.value = newValue
     }
 
     fun updateSearchTextState(newValue: String) {

app/src/main/java/com/starry/greenstash/ui/screens/home/composables/HomeAppBars.kt

@@ -50,7 +50,12 @@ import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.platform.LocalView
@@ -60,43 +65,48 @@ import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import com.starry.greenstash.R
-import com.starry.greenstash.ui.screens.home.SearchWidgetState
+import com.starry.greenstash.ui.screens.home.SearchBarState
 import com.starry.greenstash.ui.theme.greenstashFont
 import com.starry.greenstash.utils.weakHapticFeedback
 
 
 @Composable
 fun HomeAppBar(
+    searchBarState: SearchBarState,
+    searchTextState: String,
+    consumeBackPress: MutableState<Boolean>,
     onMenuClicked: () -> Unit,
     onFilterClicked: () -> Unit,
     onSearchClicked: () -> Unit,
-    searchWidgetState: SearchWidgetState,
-    searchTextState: String,
     onSearchTextChange: (String) -> Unit,
     onSearchCloseClicked: () -> Unit,
     onSearchImeAction: (String) -> Unit,
 ) {
     Crossfade(
-        targetState = searchWidgetState,
+        targetState = searchBarState,
         animationSpec = tween(durationMillis = 300),
         label = "searchbar cross-fade"
     ) {
         when (it) {
-            SearchWidgetState.CLOSED -> {
+            SearchBarState.CLOSED -> {
                 DefaultAppBar(
                     onMenuClicked = onMenuClicked,
                     onFilterClicked = onFilterClicked,
                     onSearchClicked = onSearchClicked
                 )
+                consumeBackPress.value = false
             }
 
-            SearchWidgetState.OPENED -> {
+            SearchBarState.OPENED -> {
                 SearchAppBar(
                     text = searchTextState,
                     onTextChange = onSearchTextChange,
                     onCloseClicked = onSearchCloseClicked,
                     onSearchClicked = onSearchImeAction
                 )
+                // Consume the system back button press when the search bar is open
+                // So we can close the search bar instead of navigating back.
+                consumeBackPress.value = true
             }
         }
     }
@@ -163,10 +173,12 @@ private fun SearchAppBar(
     onCloseClicked: () -> Unit,
     onSearchClicked: (String) -> Unit,
 ) {
+    val focusRequester = remember { FocusRequester() }
     Surface(
         modifier = Modifier
             .fillMaxWidth()
-            .windowInsetsPadding(insets = WindowInsets.statusBars),
+            .windowInsetsPadding(insets = WindowInsets.statusBars)
+            .focusRequester(focusRequester),
         color = MaterialTheme.colorScheme.surface
     ) {
         OutlinedTextField(
@@ -223,5 +235,8 @@ private fun SearchAppBar(
             ),
             shape = RoundedCornerShape(24.dp)
         )
+
+        // Request focus on the search bar when it is opened
+        LaunchedEffect(Unit) { focusRequester.requestFocus() }
     }
 }

app/src/main/java/com/starry/greenstash/ui/screens/home/composables/HomeScreen.kt

@@ -25,6 +25,7 @@
 
 package com.starry.greenstash.ui.screens.home.composables
 
+import androidx.activity.compose.BackHandler
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.core.keyframes
 import androidx.compose.animation.fadeIn
@@ -106,7 +107,7 @@ import com.starry.greenstash.ui.navigation.Screens
 import com.starry.greenstash.ui.screens.home.FilterField
 import com.starry.greenstash.ui.screens.home.FilterSortType
 import com.starry.greenstash.ui.screens.home.HomeViewModel
-import com.starry.greenstash.ui.screens.home.SearchWidgetState
+import com.starry.greenstash.ui.screens.home.SearchBarState
 import com.starry.greenstash.ui.theme.greenstashFont
 import com.starry.greenstash.utils.getActivity
 import com.starry.greenstash.utils.isScrollingUp
@@ -129,13 +130,25 @@ fun HomeScreen(navController: NavController) {
     val filterSheetState = rememberModalBottomSheetState()
     val drawerState = rememberDrawerState(DrawerValue.Closed)
 
-    val searchWidgetState by viewModel.searchWidgetState
+    val searchBarState by viewModel.searchBarState
     val searchTextState by viewModel.searchTextState
 
     val lazyListState = rememberLazyListState()
     val snackBarHostState = remember { SnackbarHostState() }
     val coroutineScope = rememberCoroutineScope()
 
+    // If search bar is open, then consume back button press to close it.
+    val consumeBackPress = remember { mutableStateOf(false) }
+    BackHandler(enabled = consumeBackPress.value) {
+        if (viewModel.searchBarState.value == SearchBarState.OPENED) {
+            if (searchTextState.isNotBlank()) {
+                viewModel.updateSearchTextState(newValue = "")
+            } else {
+                viewModel.updateSearchWidgetState(SearchBarState.CLOSED)
+            }
+        }
+    }
+
     if (showFilterSheet.value) {
         ModalBottomSheet(
             onDismissRequest = {
@@ -175,17 +188,14 @@ fun HomeScreen(navController: NavController) {
                 snackbarHost = { SnackbarHost(snackBarHostState) },
                 topBar = {
                     HomeAppBar(
-                        onMenuClicked = { coroutineScope.launch { drawerState.open() } },
-                        onFilterClicked = {
-
-                            showFilterSheet.value = true
-
-                        },
-                        onSearchClicked = { viewModel.updateSearchWidgetState(newValue = SearchWidgetState.OPENED) },
-                        searchWidgetState = searchWidgetState,
+                        searchBarState = searchBarState,
                         searchTextState = searchTextState,
+                        consumeBackPress = consumeBackPress,
+                        onMenuClicked = { coroutineScope.launch { drawerState.open() } },
+                        onFilterClicked = { showFilterSheet.value = true },
+                        onSearchClicked = { viewModel.updateSearchWidgetState(newValue = SearchBarState.OPENED) },
                         onSearchTextChange = { viewModel.updateSearchTextState(newValue = it) },
-                        onSearchCloseClicked = { viewModel.updateSearchWidgetState(newValue = SearchWidgetState.CLOSED) },
+                        onSearchCloseClicked = { viewModel.updateSearchWidgetState(newValue = SearchBarState.CLOSED) },
                         onSearchImeAction = { println("Meow >~< | $it") },
                     )
                 },