search: add a type filter bar and share the search field

Add a filter chip bar above the keyboard to toggle songs, albums, artists
and playlists independently, all on by default and scrolling when it
overflows. Extract one compact 48dp search field and use it in both the
cross-library screen and the library tabs.

app/src/main/kotlin/com/subtracks/ui/components/SearchField.kt

@@ -0,0 +1,95 @@
+package com.subtracks.ui.components
+
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.rounded.Close
+import androidx.compose.material.icons.rounded.Search
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import com.subtracks.R
+
+@Composable
+fun SearchField(
+    value: String,
+    onValueChange: (String) -> Unit,
+    onClose: () -> Unit,
+    focusRequester: FocusRequester,
+    modifier: Modifier = Modifier,
+    autoFocus: Boolean = true,
+) {
+    val hint = stringResource(R.string.search_input_placeholder)
+    val closeLabel = stringResource(R.string.close_search)
+    LaunchedEffect(autoFocus) { if (autoFocus) focusRequester.requestFocus() }
+    Surface(
+        shape = RoundedCornerShape(8.dp),
+        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        modifier = modifier.height(48.dp),
+    ) {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            modifier = Modifier.fillMaxWidth().padding(start = 12.dp, end = 4.dp),
+        ) {
+            Icon(
+                imageVector = Icons.Rounded.Search,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.size(20.dp),
+            )
+            Spacer(Modifier.width(8.dp))
+            BasicTextField(
+                value = value,
+                onValueChange = onValueChange,
+                singleLine = true,
+                textStyle = MaterialTheme.typography.bodyLarge.copy(color = MaterialTheme.colorScheme.onSurface),
+                cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
+                modifier =
+                    Modifier
+                        .weight(1f)
+                        .focusRequester(focusRequester)
+                        .semantics { contentDescription = hint },
+                decorationBox = { inner ->
+                    if (value.isEmpty()) {
+                        Text(
+                            text = hint,
+                            style = MaterialTheme.typography.bodyLarge,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis,
+                        )
+                    }
+                    inner()
+                },
+            )
+            IconButton(onClick = onClose) {
+                Icon(
+                    imageVector = Icons.Rounded.Close,
+                    contentDescription = closeLabel,
+                    modifier = Modifier.size(20.dp),
+                )
+            }
+        }
+    }
+}

app/src/main/kotlin/com/subtracks/ui/library/LibraryScreen.kt

@@ -32,7 +32,6 @@ import androidx.compose.material.icons.rounded.Add
 import androidx.compose.material.icons.rounded.Album
 import androidx.compose.material.icons.rounded.ArrowDownward
 import androidx.compose.material.icons.rounded.ArrowUpward
-import androidx.compose.material.icons.rounded.Close
 import androidx.compose.material.icons.rounded.CloudOff
 import androidx.compose.material.icons.rounded.DownloadDone
 import androidx.compose.material.icons.rounded.FilterAltOff
@@ -53,8 +52,6 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalBottomSheet
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
-import androidx.compose.material3.TextField
-import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.material3.pulltorefresh.PullToRefreshBox
 import androidx.compose.material3.pulltorefresh.PullToRefreshDefaults
 import androidx.compose.material3.pulltorefresh.rememberPullToRefreshState
@@ -77,7 +74,6 @@ import androidx.compose.ui.draw.clipToBounds
 import androidx.compose.ui.draw.drawBehind
 import androidx.compose.ui.draw.drawWithContent
 import androidx.compose.ui.focus.FocusRequester
-import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.geometry.CornerRadius
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.geometry.Rect
@@ -126,6 +122,7 @@ import com.subtracks.ui.components.DeleteDownloadsDialog
 import com.subtracks.ui.components.ItemActions
 import com.subtracks.ui.components.MenuTarget
 import com.subtracks.ui.components.PendingDownloadDelete
+import com.subtracks.ui.components.SearchField
 import com.subtracks.ui.components.bulkRef
 import com.subtracks.ui.components.statusBarScrim
 import com.subtracks.ui.home.HomeRoute
@@ -807,38 +804,6 @@ private val TOUCH_TARGET = 48.dp
 private const val LIST_OPTIONS_WEIGHT = 0.11f
 private val LIST_OPTIONS_BAR_WIDTHS = listOf(1f, 0.62f, 0.34f)
 
-@Composable
-private fun SearchField(
-    value: String,
-    onValueChange: (String) -> Unit,
-    onClose: () -> Unit,
-    focusRequester: FocusRequester,
-    modifier: Modifier = Modifier,
-) {
-    LaunchedEffect(Unit) { focusRequester.requestFocus() }
-    TextField(
-        value = value,
-        onValueChange = onValueChange,
-        singleLine = true,
-        placeholder = { Text(stringResource(R.string.search_input_placeholder)) },
-        leadingIcon = { Icon(Icons.Rounded.Search, contentDescription = null) },
-        trailingIcon = {
-            IconButton(onClick = onClose) {
-                Icon(Icons.Rounded.Close, contentDescription = stringResource(R.string.close_search))
-            }
-        },
-        shape = RoundedCornerShape(4.dp),
-        colors =
-            TextFieldDefaults.colors(
-                focusedContainerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
-                unfocusedContainerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
-                focusedIndicatorColor = Color.Transparent,
-                unfocusedIndicatorColor = Color.Transparent,
-            ),
-        modifier = modifier.focusRequester(focusRequester),
-    )
-}
-
 @Composable
 private fun ListOptionsGlyph(modifier: Modifier = Modifier) {
     val color = LocalContentColor.current

app/src/main/kotlin/com/subtracks/ui/search/SearchScreen.kt

@@ -1,37 +1,37 @@
 package com.subtracks.ui.search
 
+import androidx.annotation.StringRes
 import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
 import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.rememberScrollState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.rounded.ArrowBack
-import androidx.compose.material.icons.rounded.Close
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FilterChip
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
-import androidx.compose.material3.TextField
-import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 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.res.stringResource
-import androidx.compose.ui.semantics.contentDescription
-import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.subtracks.R
@@ -49,6 +49,7 @@ import com.subtracks.ui.components.EmptyState
 import com.subtracks.ui.components.ItemActions
 import com.subtracks.ui.components.LoadingState
 import com.subtracks.ui.components.MenuTarget
+import com.subtracks.ui.components.SearchField
 import com.subtracks.ui.home.AlbumListRow
 import com.subtracks.ui.home.ArtistListRow
 import com.subtracks.ui.library.PlaylistRow
@@ -56,6 +57,17 @@ import com.subtracks.ui.library.SongRow
 import org.koin.compose.koinInject
 import org.koin.compose.viewmodel.koinViewModel
 
+enum class SearchFilter(
+    @StringRes val label: Int,
+) {
+    Songs(R.string.search_songs),
+    Albums(R.string.resources_album_name),
+    Artists(R.string.resources_artist_name),
+    Playlists(R.string.resources_playlist_name),
+}
+
+private val ALL_FILTERS = SearchFilter.entries.toSet()
+
 @Composable
 fun SearchRoute(
     onBack: () -> Unit,
@@ -72,6 +84,7 @@ fun SearchRoute(
     val query by viewModel.query.collectAsStateWithLifecycle()
     val results by viewModel.results.collectAsStateWithLifecycle()
     val playback by playbackController.state.collectAsStateWithLifecycle()
+    var filterMask by rememberSaveable { mutableIntStateOf(allFilterMask()) }
     val actions =
         ItemActions(
             playNext = { playbackController.playNext(it.sourceId, it.kind, it.refId) },
@@ -84,6 +97,8 @@ fun SearchRoute(
         query = query,
         onQueryChange = viewModel::setQuery,
         results = results,
+        filters = maskToFilters(filterMask),
+        onToggleFilter = { filterMask = filterMask xor (1 shl it.ordinal) },
         coverArt = viewModel::coverArt,
         playingSongId = playback.item?.id,
         onBack = onBack,
@@ -95,12 +110,18 @@ fun SearchRoute(
     )
 }
 
+private fun allFilterMask(): Int = SearchFilter.entries.fold(0) { mask, filter -> mask or (1 shl filter.ordinal) }
+
+private fun maskToFilters(mask: Int): Set<SearchFilter> = SearchFilter.entries.filterTo(mutableSetOf()) { mask and (1 shl it.ordinal) != 0 }
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun SearchScreen(
     query: String,
     onQueryChange: (String) -> Unit,
     results: SearchResults,
+    filters: Set<SearchFilter> = ALL_FILTERS,
+    onToggleFilter: (SearchFilter) -> Unit = {},
     coverArt: (String?, Boolean) -> CoverArtRef? = { _, _ -> null },
     playingSongId: String? = null,
     onBack: () -> Unit = {},
@@ -112,15 +133,16 @@ fun SearchScreen(
     modifier: Modifier = Modifier,
 ) {
     val focusRequester = remember { FocusRequester() }
-    LaunchedEffect(Unit) { focusRequester.requestFocus() }
     val backLabel = stringResource(R.string.navigation_back)
-    val clearLabel = stringResource(R.string.close_search)
-    val hint = stringResource(R.string.search_input_placeholder)
     val minLength = stringResource(R.string.search_min_length, SEARCH_MIN_LENGTH)
     val songsLabel = stringResource(R.string.search_songs)
     val albumsLabel = stringResource(R.string.resources_album_name)
     val artistsLabel = stringResource(R.string.resources_artist_name)
     val playlistsLabel = stringResource(R.string.resources_playlist_name)
+    val showSongs = SearchFilter.Songs in filters && results.songs.isNotEmpty()
+    val showAlbums = SearchFilter.Albums in filters && results.albums.isNotEmpty()
+    val showArtists = SearchFilter.Artists in filters && results.artists.isNotEmpty()
+    val showPlaylists = SearchFilter.Playlists in filters && results.playlists.isNotEmpty()
     Scaffold(
         modifier = modifier,
         topBar = {
@@ -131,35 +153,19 @@ fun SearchScreen(
                     }
                 },
                 title = {
-                    TextField(
+                    SearchField(
                         value = query,
                         onValueChange = onQueryChange,
-                        singleLine = true,
-                        placeholder = { Text(hint) },
-                        trailingIcon = {
-                            if (query.isNotEmpty()) {
-                                IconButton(onClick = { onQueryChange("") }) {
-                                    Icon(Icons.Rounded.Close, contentDescription = clearLabel)
-                                }
-                            }
-                        },
-                        shape = RoundedCornerShape(8.dp),
-                        colors =
-                            TextFieldDefaults.colors(
-                                focusedContainerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
-                                unfocusedContainerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
-                                focusedIndicatorColor = Color.Transparent,
-                                unfocusedIndicatorColor = Color.Transparent,
-                            ),
-                        modifier =
-                            Modifier
-                                .fillMaxWidth()
-                                .focusRequester(focusRequester)
-                                .semantics { contentDescription = hint },
+                        onClose = { onQueryChange("") },
+                        focusRequester = focusRequester,
+                        modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
                     )
                 },
             )
         },
+        bottomBar = {
+            SearchFilterBar(filters = filters, onToggle = onToggleFilter)
+        },
     ) { padding ->
         when {
             !searchReady(query) -> {
@@ -173,7 +179,7 @@ fun SearchScreen(
                 LoadingState(Modifier.padding(padding))
             }
 
-            results.isEmpty -> {
+            !showSongs && !showAlbums && !showArtists && !showPlaylists -> {
                 EmptyState(
                     text = stringResource(R.string.search_no_results, query),
                     modifier = Modifier.padding(padding),
@@ -185,16 +191,40 @@ fun SearchScreen(
                     modifier = Modifier.fillMaxSize().padding(padding),
                     contentPadding = PaddingValues(bottom = 24.dp),
                 ) {
-                    songResults(results.songs, songsLabel, coverArt, playingSongId, onSongClick, onLongClick)
-                    albumResults(results.albums, albumsLabel, coverArt, onAlbumClick, onLongClick)
-                    artistResults(results.artists, artistsLabel, coverArt, onArtistClick, onLongClick)
-                    playlistResults(results.playlists, playlistsLabel, coverArt, onPlaylistClick, onLongClick)
+                    if (showSongs) songResults(results.songs, songsLabel, coverArt, playingSongId, onSongClick, onLongClick)
+                    if (showAlbums) albumResults(results.albums, albumsLabel, coverArt, onAlbumClick, onLongClick)
+                    if (showArtists) artistResults(results.artists, artistsLabel, coverArt, onArtistClick, onLongClick)
+                    if (showPlaylists) playlistResults(results.playlists, playlistsLabel, coverArt, onPlaylistClick, onLongClick)
                 }
             }
         }
     }
 }
 
+@Composable
+private fun SearchFilterBar(
+    filters: Set<SearchFilter>,
+    onToggle: (SearchFilter) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Row(
+        modifier =
+            modifier
+                .fillMaxWidth()
+                .horizontalScroll(rememberScrollState())
+                .padding(horizontal = 12.dp, vertical = 8.dp),
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+    ) {
+        SearchFilter.entries.forEach { filter ->
+            FilterChip(
+                selected = filter in filters,
+                onClick = { onToggle(filter) },
+                label = { Text(stringResource(filter.label)) },
+            )
+        }
+    }
+}
+
 private fun LazyListScope.resultHeader(title: String) {
     item(key = "search-header-$title") {
         Text(

app/src/test/kotlin/com/subtracks/ui/search/SearchScreenTest.kt

@@ -49,10 +49,10 @@ class SearchScreenTest {
             }
         }
 
-        composeRule.onNodeWithText("Songs").assertIsDisplayed()
-        composeRule.onNodeWithText("Albums").assertIsDisplayed()
-        composeRule.onNodeWithText("Artists").assertIsDisplayed()
-        composeRule.onNodeWithText("Playlists").assertIsDisplayed()
+        composeRule.onNodeWithText("Road Song").assertIsDisplayed()
+        composeRule.onNodeWithText("Road Album").assertIsDisplayed()
+        composeRule.onNodeWithText("Road Artist").assertIsDisplayed()
+        composeRule.onNodeWithText("Road Trip").assertIsDisplayed()
 
         composeRule.onNodeWithText("Road Song").performClick()
         composeRule.onNodeWithText("Road Album").performClick()
@@ -107,6 +107,46 @@ class SearchScreenTest {
         composeRule.onNodeWithText("Road Trip").assertIsDisplayed()
     }
 
+    @Test
+    fun disablingATypeHidesItsSection() {
+        composeRule.setContent {
+            SubtracksTheme {
+                SearchScreen(
+                    query = "road",
+                    onQueryChange = {},
+                    results =
+                        SearchResults(
+                            albums = listOf(album("al-1", "Road Album")),
+                            songs = listOf(AlbumSongItem(song("s1", "Road Song"), coverArt = null)),
+                        ),
+                    filters = setOf(SearchFilter.Albums),
+                )
+            }
+        }
+
+        composeRule.onNodeWithText("Road Album").assertIsDisplayed()
+        composeRule.onNodeWithText("Road Song").assertDoesNotExist()
+    }
+
+    @Test
+    fun tappingAFilterChipTogglesIt() {
+        var toggled: SearchFilter? = null
+        composeRule.setContent {
+            SubtracksTheme {
+                SearchScreen(
+                    query = "ro",
+                    onQueryChange = {},
+                    results = SearchResults(),
+                    onToggleFilter = { toggled = it },
+                )
+            }
+        }
+
+        composeRule.onNodeWithText("Playlists").performClick()
+
+        assertEquals(SearchFilter.Playlists, toggled)
+    }
+
     private fun album(
         id: String,
         name: String,