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
@@ -29,6 +31,14 @@ class MoreController : SettingsController(), RootController {
 
         val tintColor = context.getResourceColor(R.attr.colorAccent)
 
+        switchPreference {
+            key = Keys.offlineMode
+            titleRes = R.string.label_offline_mode
+            iconRes = R.drawable.ic_cloud_off_24dp
+            iconTint = tintColor
+        }
+
+        preferenceCategory {
             badgePreference {
                 titleRes = R.string.label_extensions
                 iconRes = R.drawable.ic_extension_24dp
@@ -54,6 +64,7 @@ class MoreController : SettingsController(), RootController {
                     router.pushController(MigrationController().withFadeTransaction())
                 }
             }
+        }
 
         preferenceCategory {
             preference {

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

app/src/main/res/drawable/ic_cloud_off_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M19.35,10.04C18.67,6.59 15.64,4 12,4c-1.48,0 -2.85,0.43 -4.01,1.17l1.46,1.46C10.21,6.23 11.08,6 12,6c3.04,0 5.5,2.46 5.5,5.5v0.5H19c1.66,0 3,1.34 3,3 0,1.13 -0.64,2.11 -1.56,2.62l1.45,1.45C23.16,18.16 24,16.68 24,15c0,-2.64 -2.05,-4.78 -4.65,-4.96zM3,5.27l2.75,2.74C2.56,8.15 0,10.77 0,14c0,3.31 2.69,6 6,6h11.73l2,2L21,20.73 4.27,4 3,5.27zM7.73,10l8,8H6c-2.21,0 -4,-1.79 -4,-4s1.79,-4 4,-4h1.73z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/values/strings.xml

@@ -12,6 +12,7 @@
 
     <!-- Activities and fragments labels (toolbar title) -->
     <string name="label_more">More</string>
+    <string name="label_offline_mode">Offline mode</string>
     <string name="label_settings">Settings</string>
     <string name="label_download_queue">Download queue</string>
     <string name="label_library">Library</string>