Show empty screen when a category is empty (#8690)

* Show empty screen when a category is empty

* Review changes

* Review changes #2

Co-authored-by: arkon <arkon@users.noreply.github.com>

app/src/main/java/eu/kanade/presentation/browse/ExtensionsScreen.kt

@@ -58,6 +58,7 @@ import eu.kanade.tachiyomi.util.system.LocaleHelper
 fun ExtensionScreen(
     state: ExtensionsState,
     contentPadding: PaddingValues,
+    searchQuery: String? = null,
     onLongClickItem: (Extension) -> Unit,
     onClickItemCancel: (Extension) -> Unit,
     onInstallExtension: (Extension.Available) -> Unit,
@@ -75,10 +76,17 @@ fun ExtensionScreen(
     ) {
         when {
             state.isLoading -> LoadingScreen(modifier = Modifier.padding(contentPadding))
-            state.isEmpty -> EmptyScreen(
-                textResource = R.string.empty_screen,
-                modifier = Modifier.padding(contentPadding),
-            )
+            state.isEmpty -> {
+                val msg = if (!searchQuery.isNullOrEmpty()) {
+                    R.string.no_results_found
+                } else {
+                    R.string.empty_screen
+                }
+                EmptyScreen(
+                    textResource = msg,
+                    modifier = Modifier.padding(contentPadding),
+                )
+            }
             else -> {
                 ExtensionContent(
                     state = state,

app/src/main/java/eu/kanade/presentation/history/HistoryScreen.kt

@@ -58,8 +58,13 @@ fun HistoryScreen(
             if (it == null) {
                 LoadingScreen(modifier = Modifier.padding(contentPadding))
             } else if (it.isEmpty()) {
+                val msg = if (!state.searchQuery.isNullOrEmpty()) {
+                    R.string.no_results_found
+                } else {
+                    R.string.information_no_recent_manga
+                }
                 EmptyScreen(
-                    textResource = R.string.information_no_recent_manga,
+                    textResource = msg,
                     modifier = Modifier.padding(contentPadding),
                 )
             } else {

app/src/main/java/eu/kanade/presentation/library/components/LibraryContent.kt

@@ -32,6 +32,7 @@ fun LibraryContent(
     selection: List<LibraryManga>,
     contentPadding: PaddingValues,
     currentPage: () -> Int,
+    hasActiveFilters: Boolean,
     showPageTabs: Boolean,
     onChangeCurrentPage: (Int) -> Unit,
     onMangaClicked: (Long) -> Unit,
@@ -97,6 +98,7 @@ fun LibraryContent(
                 state = pagerState,
                 contentPadding = PaddingValues(bottom = contentPadding.calculateBottomPadding()),
                 pageCount = categories.size,
+                hasActiveFilters = hasActiveFilters,
                 selectedManga = selection,
                 searchQuery = searchQuery,
                 onGlobalSearchClicked = onGlobalSearchClicked,

app/src/main/java/eu/kanade/presentation/library/components/LibraryPager.kt

@@ -3,6 +3,7 @@ package eu.kanade.presentation.library.components
 import android.content.res.Configuration
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -13,8 +14,10 @@ import androidx.compose.ui.platform.LocalConfiguration
 import eu.kanade.core.prefs.PreferenceMutableState
 import eu.kanade.domain.library.model.LibraryDisplayMode
 import eu.kanade.domain.library.model.LibraryManga
+import eu.kanade.presentation.components.EmptyScreen
 import eu.kanade.presentation.components.HorizontalPager
 import eu.kanade.presentation.components.PagerState
+import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.ui.library.LibraryItem
 
 @Composable
@@ -22,6 +25,7 @@ fun LibraryPager(
     state: PagerState,
     contentPadding: PaddingValues,
     pageCount: Int,
+    hasActiveFilters: Boolean,
     selectedManga: List<LibraryManga>,
     searchQuery: String?,
     onGlobalSearchClicked: () -> Unit,
@@ -43,6 +47,12 @@ fun LibraryPager(
             return@HorizontalPager
         }
         val library = getLibraryForPage(page)
+
+        if (library.isEmpty()) {
+            LibraryPagerEmptyScreen(searchQuery, hasActiveFilters, contentPadding)
+            return@HorizontalPager
+        }
+
         val displayMode = getDisplayModeForPage(page)
         val columns by if (displayMode != LibraryDisplayMode.List) {
             val configuration = LocalConfiguration.current
@@ -96,3 +106,21 @@ fun LibraryPager(
         }
     }
 }
+
+@Composable
+private fun LibraryPagerEmptyScreen(
+    searchQuery: String?,
+    hasActiveFilters: Boolean,
+    contentPadding: PaddingValues,
+) {
+    val msg = when {
+        !searchQuery.isNullOrEmpty() -> R.string.no_results_found
+        hasActiveFilters -> R.string.error_no_match
+        else -> R.string.information_no_manga_category
+    }
+
+    EmptyScreen(
+        textResource = msg,
+        modifier = Modifier.padding(contentPadding),
+    )
+}

app/src/main/java/eu/kanade/tachiyomi/ui/browse/extension/ExtensionsTab.kt

@@ -21,6 +21,7 @@ fun extensionsTab(
 ): TabContent {
     val navigator = LocalNavigator.currentOrThrow
     val state by extensionsScreenModel.state.collectAsState()
+    val searchQuery by extensionsScreenModel.query.collectAsState()
 
     return TabContent(
         titleRes = R.string.label_extensions,
@@ -37,6 +38,7 @@ fun extensionsTab(
             ExtensionScreen(
                 state = state,
                 contentPadding = contentPadding,
+                searchQuery = searchQuery,
                 onLongClickItem = { extension ->
                     when (extension) {
                         is Extension.Available -> extensionsScreenModel.installExtension(extension)

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryScreenModel.kt

@@ -742,17 +742,19 @@ class LibraryScreenModel(
         val showMangaContinueButton: Boolean = false,
         val dialog: Dialog? = null,
     ) {
-        val selectionMode = selection.isNotEmpty()
-
-        val categories = library.keys.toList()
-
-        val libraryCount by lazy {
+        private val libraryCount by lazy {
             library.values
                 .flatten()
                 .fastDistinctBy { it.libraryManga.manga.id }
                 .size
         }
 
+        val isLibraryEmpty by lazy { libraryCount == 0 }
+
+        val selectionMode = selection.isNotEmpty()
+
+        val categories = library.keys.toList()
+
         fun getLibraryItemsByCategoryId(categoryId: Long): List<LibraryItem>? {
             return library.firstNotNullOfOrNull { (k, v) -> v.takeIf { k.id == categoryId } }
         }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryTab.kt

@@ -149,7 +149,7 @@ object LibraryTab : Tab {
         ) { contentPadding ->
             when {
                 state.isLoading -> LoadingScreen(modifier = Modifier.padding(contentPadding))
-                state.searchQuery.isNullOrEmpty() && !state.hasActiveFilters && state.libraryCount == 0 -> {
+                state.searchQuery.isNullOrEmpty() && !state.hasActiveFilters && state.isLibraryEmpty -> {
                     val handler = LocalUriHandler.current
                     EmptyScreen(
                         textResource = R.string.information_empty_library,
@@ -170,6 +170,7 @@ object LibraryTab : Tab {
                         selection = state.selection,
                         contentPadding = contentPadding,
                         currentPage = { screenModel.activeCategoryIndex },
+                        hasActiveFilters = state.hasActiveFilters,
                         showPageTabs = state.showCategoryTabs || !state.searchQuery.isNullOrEmpty(),
                         onChangeCurrentPage = { screenModel.activeCategoryIndex = it },
                         onMangaClicked = { navigator.push(MangaScreen(it)) },