Add forum view style persistence

Cherry-picked from logopek/reX: e6d439d
- Save user's preferred forum view (tabs vs topics list)
- Respect saved preference when opening forums
- Store preference per chat in TdlibSettingsManager

Co-Authored-By: shikaatux <logopek@github.com>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people

app/src/main/java/org/thunderdog/challegram/telegram/TdlibSettingsManager.java

@@ -69,6 +69,7 @@ public class TdlibSettingsManager implements CleanupStartupDelegate {
 
   private static final String DISMISS_MESSAGE_PREFIX = "dismiss_pinned_";
   private static final String DISMISS_REQUESTS_PREFIX = "dismiss_requests_";
+  private static final String FORUM_VIEW_PREFERENCE_PREFIX = "forum_view_";
 
   private static final String NOTIFICATION_GROUP_DATA_PREFIX = "notification_gdata_";
   private static final String NOTIFICATION_DATA_PREFIX = "notification_data_";
@@ -175,6 +176,7 @@ public void onPerformUserCleanup () {
     Settings.instance().removeScrollPositions(accountId, editor);
     String dismissPrefix = key(DISMISS_MESSAGE_PREFIX, accountId);
     String dismissReqPrefix = key(DISMISS_REQUESTS_PREFIX, accountId);
+    String forumViewPrefix = key(FORUM_VIEW_PREFERENCE_PREFIX, accountId);
     String notificationGroupDataPrefix = key(NOTIFICATION_GROUP_DATA_PREFIX, accountId);
     String notificationDataPrefix = key(NOTIFICATION_DATA_PREFIX, accountId);
     String conversionPrefix = key(CONVERSION_PREFIX, accountId);
@@ -183,6 +185,7 @@ public void onPerformUserCleanup () {
     Settings.instance().removeByAnyPrefix(new String[] {
       dismissPrefix,
       dismissReqPrefix,
+      forumViewPrefix,
       notificationGroupDataPrefix,
       notificationDataPrefix,
       conversionPrefix,
@@ -288,6 +291,23 @@ public boolean isRequestsDismissed (long chatId, TdApi.ChatJoinRequestsInfo pend
     return pendingInfo == null || Arrays.equals(Settings.instance().getLongArray(key(DISMISS_REQUESTS_PREFIX, tdlib.id()) + chatId), pendingInfo.userIds);
   }
 
+  // Forum view preference: true = tabs, false = topics list
+  // This is used when forum has hasForumTabs enabled to remember user's choice
+  public static final int FORUM_VIEW_TABS = 1;
+  public static final int FORUM_VIEW_TOPICS = 2;
+
+  public void setForumViewPreference (long chatId, int viewPreference) {
+    Settings.instance().putInt(key(FORUM_VIEW_PREFERENCE_PREFIX, tdlib.id()) + chatId, viewPreference);
+  }
+
+  public int getForumViewPreference (long chatId) {
+    return Settings.instance().getInt(key(FORUM_VIEW_PREFERENCE_PREFIX, tdlib.id()) + chatId, 0);
+  }
+
+  public boolean hasForumViewPreference (long chatId) {
+    return getForumViewPreference(chatId) != 0;
+  }
+
   public boolean forcePlainModeInChannels () {
     if (_forcePlainModeInChannels == null)
       _forcePlainModeInChannels = Settings.instance().getBoolean(key(PLAIN_CHANNEL_KEY, tdlib.id()), true);

app/src/main/java/org/thunderdog/challegram/telegram/TdlibUi.java

@@ -2136,7 +2136,12 @@ public void openChat (final TdlibDelegate context, final @NonNull TdApi.Chat cha
       // Users can use "View as chat" option to switch to unified view (sets viewAsTopics to false)
       if (chat.viewAsTopics || hasForumTabs) {
         ViewController<?> forumController;
-        if (hasForumTabs) {
+        // Check user's saved preference for forum view (tabs vs topics list)
+        int viewPreference = tdlib.settings().getForumViewPreference(chat.id);
+        boolean preferTabs = hasForumTabs && viewPreference != TdlibSettingsManager.FORUM_VIEW_TOPICS;
+        boolean preferTopics = !hasForumTabs || viewPreference == TdlibSettingsManager.FORUM_VIEW_TOPICS;
+
+        if (preferTabs) {
           ForumTopicTabsController tabsController = new ForumTopicTabsController(context.context(), context.tdlib());
           tabsController.setArguments(new ForumTopicTabsController.Arguments(chat));
           forumController = tabsController;

app/src/main/java/org/thunderdog/challegram/ui/ForumTopicTabsController.java

@@ -36,6 +36,7 @@
 import tgx.td.ChatId;
 import org.thunderdog.challegram.telegram.Tdlib;
 import org.thunderdog.challegram.telegram.TdlibCache;
+import org.thunderdog.challegram.telegram.TdlibSettingsManager;
 import org.thunderdog.challegram.telegram.TdlibUi;
 import org.thunderdog.challegram.tool.Screen;
 import org.thunderdog.challegram.tool.UI;
@@ -420,6 +421,8 @@ public void onMoreItemPressed (int id) {
       profileController.setArguments(new ProfileController.Args(chat, null, false));
       navigateTo(profileController);
     } else if (id == R.id.btn_viewAsTopics) {
+      // Save preference for topics list view
+      tdlib.settings().setForumViewPreference(chatId, TdlibSettingsManager.FORUM_VIEW_TOPICS);
       // Switch to topics list view (ForumTopicsController)
       ForumTopicsController listController = new ForumTopicsController(context, tdlib);
       listController.setArguments(new ForumTopicsController.Arguments(chat));

app/src/main/java/org/thunderdog/challegram/ui/ForumTopicsController.java

@@ -42,6 +42,7 @@
 import org.thunderdog.challegram.telegram.MessageListener;
 import org.thunderdog.challegram.telegram.Tdlib;
 import org.thunderdog.challegram.telegram.TdlibCache;
+import org.thunderdog.challegram.telegram.TdlibSettingsManager;
 import org.thunderdog.challegram.telegram.TdlibUi;
 import org.thunderdog.challegram.theme.ColorId;
 import org.thunderdog.challegram.tool.Screen;
@@ -697,6 +698,8 @@ public void destroy () {
   @Override
   public void onMoreItemPressed (int id) {
     if (id == R.id.btn_viewAsTabs) {
+      // Save preference for tabs view
+      tdlib.settings().setForumViewPreference(chatId, TdlibSettingsManager.FORUM_VIEW_TABS);
       // Switch to tabs view (ForumTopicTabsController)
       ForumTopicTabsController tabsController = new ForumTopicTabsController(context, tdlib);
       tabsController.setArguments(new ForumTopicTabsController.Arguments(chat));