Bring back empty trash

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

@@ -20,6 +20,7 @@ package eu.faircode.email;
 */
 
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.res.ColorStateList;
@@ -78,7 +79,8 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
 
         private final static int action_synchronize_now = 1;
         private final static int action_delete_local = 2;
-        private final static int action_edit_properties = 3;
+        private final static int action_empty_trash = 3;
+        private final static int action_edit_properties = 4;
 
         ViewHolder(View itemView) {
             super(itemView);
@@ -222,9 +224,11 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
 
             if (!EntityFolder.DRAFTS.equals(folder.type))
                 popupMenu.getMenu().add(Menu.NONE, action_delete_local, 2, R.string.title_delete_local);
+            if (EntityFolder.TRASH.equals(folder.type))
+                popupMenu.getMenu().add(Menu.NONE, action_empty_trash, 3, R.string.title_empty_trash);
 
             if (folder.account != null)
-                popupMenu.getMenu().add(Menu.NONE, action_edit_properties, 3, R.string.title_edit_properties);
+                popupMenu.getMenu().add(Menu.NONE, action_edit_properties, 4, R.string.title_edit_properties);
 
             popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                 @Override
@@ -238,6 +242,10 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
                             OnActionDeleteLocal();
                             return true;
 
+                        case action_empty_trash:
+                            onActionEmptyTrash();
+                            return true;
+
                         case action_edit_properties:
                             onActionEditProperties();
                             return true;
@@ -305,6 +313,49 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
                     }.load(context, owner, args);
                 }
 
+                private void onActionEmptyTrash() {
+                    new DialogBuilderLifecycle(context, owner)
+                            .setMessage(R.string.title_empty_trash_ask)
+                            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                                @Override
+                                public void onClick(DialogInterface dialog, int which) {
+
+                                    Bundle args = new Bundle();
+                                    args.putLong("id", folder.id);
+
+                                    new SimpleTask<Void>() {
+                                        @Override
+                                        protected Void onLoad(Context context, Bundle args) {
+                                            long id = args.getLong("id");
+
+                                            DB db = DB.getInstance(context);
+                                            try {
+                                                db.beginTransaction();
+
+                                                for (Long mid : db.message().getMessageByFolder(id)) {
+                                                    EntityMessage message = db.message().getMessage(mid);
+                                                    EntityOperation.queue(db, message, EntityOperation.DELETE);
+                                                }
+
+                                                db.setTransactionSuccessful();
+                                            } finally {
+                                                db.endTransaction();
+                                            }
+
+                                            return null;
+                                        }
+
+                                        @Override
+                                        protected void onException(Bundle args, Throwable ex) {
+                                            Helper.unexpectedError(context, owner, ex);
+                                        }
+                                    }.load(context, owner, args);
+                                }
+                            })
+                            .setNegativeButton(android.R.string.cancel, null)
+                            .show();
+                }
+
                 private void onActionEditProperties() {
                     LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
                     lbm.sendBroadcast(

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

@@ -204,8 +204,10 @@
 
     <string name="title_synchronize_now">Synchronize now</string>
     <string name="title_delete_local">Delete local messages</string>
+    <string name="title_empty_trash">Empty trash</string>
     <string name="title_edit_properties">Edit properties</string>
 
+    <string name="title_empty_trash_ask">Delete all trashed messages permanently?</string>
     <string name="title_delete_operation">Delete operations with an error message?</string>
 
     <string name="title_folder_name">Folder name</string>