Allow swipe if target folders exists only

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -357,7 +357,7 @@ public class AdapterMessage extends PagedListAdapter<TupleMessageEx, AdapterMess
             pbBody.setVisibility(View.GONE);
             grpAttachments.setVisibility(message.attachments > 0 && show_expanded ? View.VISIBLE : View.GONE);
 
-            db.folder().liveFolders(message.account).removeObservers(owner);
+            db.folder().liveSystemFolders(message.account).removeObservers(owner);
             db.attachment().liveAttachments(message.id).removeObservers(owner);
 
             bnvActions.setTag(null);
@@ -391,9 +391,9 @@ public class AdapterMessage extends PagedListAdapter<TupleMessageEx, AdapterMess
 
                 if (!EntityFolder.OUTBOX.equals(message.folderType)) {
                     bnvActions.setHasTransientState(true);
-                    db.folder().liveFolders(message.account).observe(owner, new Observer<List<TupleFolderEx>>() {
+                    db.folder().liveSystemFolders(message.account).observe(owner, new Observer<List<EntityFolder>>() {
                         @Override
-                        public void onChanged(@Nullable List<TupleFolderEx> folders) {
+                        public void onChanged(@Nullable List<EntityFolder> folders) {
                             if (bnvActions.hasTransientState()) {
                                 boolean hasJunk = false;
                                 boolean hasTrash = false;

app/src/main/java/eu/faircode/email/DaoFolder.java

@@ -55,6 +55,11 @@ public interface DaoFolder {
             " GROUP BY folder.id")
     LiveData<List<TupleFolderEx>> liveFolders(long account);
 
+    @Query("SELECT * FROM folder" +
+            " WHERE (:account < 0 OR folder.account = :account)" +
+            " AND type <> '" + EntityFolder.USER + "'")
+    LiveData<List<EntityFolder>> liveSystemFolders(long account);
+
     @Query("SELECT folder.*, account.name AS accountName" +
             ", COUNT(message.id) AS messages" +
             ", SUM(CASE WHEN message.content = 1 THEN 1 ELSE 0 END) AS content" +
@@ -118,9 +123,8 @@ public interface DaoFolder {
 
     @Query("UPDATE folder" +
             " SET type = '" + EntityFolder.USER + "'" +
-            " WHERE account = :account" +
-            " AND type = :type")
-    int setFolderUser(long account, String type);
+            " WHERE account = :account")
+    int setFoldersUser(long account);
 
     @Query("UPDATE folder" +
             " SET name = :name" +

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -628,8 +628,6 @@ public class FragmentAccount extends FragmentEx {
                             interval = "9";
                         if (synchronize && drafts == null)
                             throw new Throwable(getContext().getString(R.string.title_no_drafts));
-                        if (synchronize && trash == null)
-                            throw new Throwable(getContext().getString(R.string.title_no_trash));
                         if (Color.TRANSPARENT == color)
                             color = null;
 
@@ -731,8 +729,8 @@ public class FragmentAccount extends FragmentEx {
                                 folders.add(junk);
                             }
 
+                            db.folder().setFoldersUser(account.id);
                             for (EntityFolder folder : folders) {
-                                db.folder().setFolderUser(account.id, folder.type);
                                 EntityFolder existing = db.folder().getFolderByName(account.id, folder.name);
                                 if (existing == null) {
                                     folder.account = account.id;

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -88,6 +88,8 @@ public class FragmentMessages extends FragmentEx {
     private long primary = -1;
     private boolean connected = false;
     private AdapterMessage adapter;
+    private List<Long> archives = new ArrayList<>();
+    private List<Long> trashes = new ArrayList<>();
 
     private AdapterMessage.ViewType viewType;
     private LiveData<PagedList<TupleMessageEx>> messages = null;
@@ -242,7 +244,13 @@ public class FragmentMessages extends FragmentEx {
                         EntityFolder.OUTBOX.equals(message.folderType))
                     return 0;
 
-                return makeMovementFlags(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT);
+                int flags = 0;
+                if (archives.contains(message.account))
+                    flags |= ItemTouchHelper.RIGHT;
+                if (trashes.contains(message.account))
+                    flags |= ItemTouchHelper.LEFT;
+
+                return makeMovementFlags(0, flags);
             }
 
             @Override
@@ -583,8 +591,25 @@ public class FragmentMessages extends FragmentEx {
                 break;
         }
 
-        // Messages
-        loadMessages();
+        // Folders and messages
+        db.folder().liveSystemFolders(account).observe(getViewLifecycleOwner(), new Observer<List<EntityFolder>>() {
+            @Override
+            public void onChanged(List<EntityFolder> folders) {
+                if (folders == null)
+                    folders = new ArrayList<>();
+
+                archives.clear();
+                trashes.clear();
+
+                for (EntityFolder folder : folders)
+                    if (EntityFolder.ARCHIVE.equals(folder.type))
+                        archives.add(folder.account);
+                    else if (EntityFolder.TRASH.equals(folder.type))
+                        trashes.add(folder.account);
+
+                loadMessages();
+            }
+        });
 
         if (viewType == AdapterMessage.ViewType.THREAD) {
             // Navigation

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

@@ -126,7 +126,6 @@
     <string name="title_no_user">User name missing</string>
     <string name="title_no_password">Password missing</string>
     <string name="title_no_drafts">No drafts folder selected</string>
-    <string name="title_no_trash">No trash folder selected</string>
     <string name="title_no_primary_drafts">No primary account or no drafts folder</string>
     <string name="title_no_primary_archive">No primary account or no archive folder</string>
     <string name="title_no_idle">This provider does not support push messages. Reception of new messages can be delayed.</string>