Add offline mode (forced download filters; closes #2902)

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -99,6 +99,8 @@ object PreferenceKeys {
 
     const val libraryUpdatePrioritization = "library_update_prioritization"
 
+    const val offlineMode = "pref_offline_mode"
+
     const val filterDownloaded = "pref_filter_downloaded_key"
 
     const val filterUnread = "pref_filter_unread_key"

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -183,6 +183,8 @@ class PreferencesHelper(val context: Context) {
 
     fun downloadBadge() = rxPrefs.getBoolean(Keys.downloadBadge, false)
 
+    fun offlineMode() = flowPrefs.getBoolean(Keys.offlineMode, false)
+
     fun filterDownloaded() = rxPrefs.getBoolean(Keys.filterDownloaded, false)
 
     fun filterUnread() = rxPrefs.getBoolean(Keys.filterUnread, false)

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

@@ -111,10 +111,8 @@ class LibraryPresenter(
      * @param map the map to filter.
      */
     private fun applyFilters(map: LibraryMap): LibraryMap {
-        val filterDownloaded = preferences.filterDownloaded().getOrDefault()
-
+        val filterDownloaded = preferences.offlineMode().get() || preferences.filterDownloaded().getOrDefault()
         val filterUnread = preferences.filterUnread().getOrDefault()
-
         val filterCompleted = preferences.filterCompleted().getOrDefault()
 
         val filterFn: (LibraryItem) -> Boolean = f@{ item ->

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

@@ -96,7 +96,8 @@ class LibrarySettingsSheet(
             override val footer = Item.Separator()
 
             override fun initModels() {
-                downloaded.checked = preferences.filterDownloaded().getOrDefault()
+                downloaded.checked = preferences.offlineMode().get() || preferences.filterDownloaded().getOrDefault()
+                downloaded.enabled = !preferences.offlineMode().get()
                 unread.checked = preferences.filterUnread().getOrDefault()
                 completed.checked = preferences.filterCompleted().getOrDefault()
             }

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersController.kt

@@ -155,6 +155,7 @@ class ChaptersController : NucleusController<ChaptersControllerBinding, Chapters
         menuFilterRead.isChecked = presenter.onlyRead()
         menuFilterUnread.isChecked = presenter.onlyUnread()
         menuFilterDownloaded.isChecked = presenter.onlyDownloaded()
+        menuFilterDownloaded.isEnabled = !presenter.isOfflineMode()
         menuFilterBookmarked.isChecked = presenter.onlyBookmarked()
 
         val filterSet = presenter.onlyRead() || presenter.onlyUnread() || presenter.onlyDownloaded() || presenter.onlyBookmarked()

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersPresenter.kt

@@ -366,11 +366,18 @@ class ChaptersPresenter(
         refreshChapters()
     }
 
+    /**
+     * Whether offline mode is enabled (i.e. force only downloaded content).
+     */
+    fun isOfflineMode(): Boolean {
+        return preferences.offlineMode().get()
+    }
+
     /**
      * Whether the display only downloaded filter is enabled.
      */
     fun onlyDownloaded(): Boolean {
-        return manga.downloadedFilter == Manga.SHOW_DOWNLOADED
+        return isOfflineMode() || manga.downloadedFilter == Manga.SHOW_DOWNLOADED
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt

@@ -2,6 +2,7 @@ package eu.kanade.tachiyomi.ui.more
 
 import androidx.preference.PreferenceScreen
 import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.ui.base.controller.RootController
 import eu.kanade.tachiyomi.ui.base.controller.withFadeTransaction
@@ -16,6 +17,7 @@ import eu.kanade.tachiyomi.util.preference.iconTint
 import eu.kanade.tachiyomi.util.preference.onClick
 import eu.kanade.tachiyomi.util.preference.preference
 import eu.kanade.tachiyomi.util.preference.preferenceCategory
+import eu.kanade.tachiyomi.util.preference.switchPreference
 import eu.kanade.tachiyomi.util.preference.titleRes
 import eu.kanade.tachiyomi.util.system.getResourceColor
 import eu.kanade.tachiyomi.util.system.openInBrowser
@@ -29,29 +31,38 @@ class MoreController : SettingsController(), RootController {
 
         val tintColor = context.getResourceColor(R.attr.colorAccent)
 
-        badgePreference {
-            titleRes = R.string.label_extensions
-            iconRes = R.drawable.ic_extension_24dp
+        switchPreference {
+            key = Keys.offlineMode
+            titleRes = R.string.label_offline_mode
+            iconRes = R.drawable.ic_cloud_off_24dp
             iconTint = tintColor
-            setBadge(Injekt.get<PreferencesHelper>().extensionUpdatesCount().get())
-            onClick {
-                router.pushController(ExtensionController().withFadeTransaction())
-            }
         }
-        preference {
-            titleRes = R.string.label_download_queue
-            iconRes = R.drawable.ic_file_download_black_24dp
-            iconTint = tintColor
-            onClick {
-                router.pushController(DownloadController().withFadeTransaction())
+
+        preferenceCategory {
+            badgePreference {
+                titleRes = R.string.label_extensions
+                iconRes = R.drawable.ic_extension_24dp
+                iconTint = tintColor
+                setBadge(Injekt.get<PreferencesHelper>().extensionUpdatesCount().get())
+                onClick {
+                    router.pushController(ExtensionController().withFadeTransaction())
+                }
             }
-        }
-        preference {
-            titleRes = R.string.label_migration
-            iconRes = R.drawable.ic_compare_arrows_black_24dp
-            iconTint = tintColor
-            onClick {
-                router.pushController(MigrationController().withFadeTransaction())
+            preference {
+                titleRes = R.string.label_download_queue
+                iconRes = R.drawable.ic_file_download_black_24dp
+                iconTint = tintColor
+                onClick {
+                    router.pushController(DownloadController().withFadeTransaction())
+                }
+            }
+            preference {
+                titleRes = R.string.label_migration
+                iconRes = R.drawable.ic_compare_arrows_black_24dp
+                iconTint = tintColor
+                onClick {
+                    router.pushController(MigrationController().withFadeTransaction())
+                }
             }
         }
 

app/src/main/java/eu/kanade/tachiyomi/widget/ExtendedNavigationView.kt

@@ -40,7 +40,7 @@ open class ExtendedNavigationView @JvmOverloads constructor(
         /**
          * A checkbox.
          */
-        open class Checkbox(val resTitle: Int, var checked: Boolean = false) : Item()
+        open class Checkbox(val resTitle: Int, var checked: Boolean = false, var enabled: Boolean = true) : Item()
 
         /**
          * A checkbox belonging to a group. The group must handle selections and restrictions.
@@ -218,6 +218,7 @@ open class ExtendedNavigationView @JvmOverloads constructor(
                     val item = items[position] as Item.CheckboxGroup
                     holder.check.setText(item.resTitle)
                     holder.check.isChecked = item.checked
+                    holder.check.isEnabled = item.enabled
                 }
                 is MultiStateHolder -> {
                     val item = items[position] as Item.MultiStateGroup