From dca3447446cc82dd79094785ea8c306119472bcd Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Sat, 25 May 2019 22:51:44 +0200
Subject: [PATCH] Collapsible folder selector

---
 .../java/eu/faircode/email/AdapterFolder.java | 233 +++++++++++-------
 .../faircode/email/AdapterFolderSelect.java   | 184 --------------
 .../eu/faircode/email/AdapterMessage.java     |  91 ++++---
 .../java/eu/faircode/email/DaoFolder.java     |  13 +
 .../eu/faircode/email/FragmentFolders.java    |   2 +-
 .../eu/faircode/email/FragmentMessages.java   |  26 +-
 .../main/res/layout/item_folder_select.xml    |  22 +-
 7 files changed, 231 insertions(+), 340 deletions(-)
 delete mode 100644 app/src/main/java/eu/faircode/email/AdapterFolderSelect.java

diff --git a/app/src/main/java/eu/faircode/email/AdapterFolder.java b/app/src/main/java/eu/faircode/email/AdapterFolder.java
index f9fab42e2f..2259af5ece 100644
--- a/app/src/main/java/eu/faircode/email/AdapterFolder.java
+++ b/app/src/main/java/eu/faircode/email/AdapterFolder.java
@@ -69,6 +69,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
     private boolean show_hidden;
 
     private long account;
+    private IFolderSelectedListener listener;
 
     private boolean subscriptions;
     private boolean debug;
@@ -141,7 +142,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         private void bindTo(final TupleFolderEx folder) {
             boolean hidden = (folder.hide && !show_hidden);
 
-            int level = 1;
+            int level = 0;
             TupleFolderEx parent = folder.parent_ref;
             while (parent != null) {
                 level++;
@@ -150,6 +151,20 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
                 parent = parent.parent_ref;
             }
 
+            boolean root_childs_visible = false;
+            if (folder.parent_ref != null &&
+                    folder.parent_ref.parent_ref == null &&
+                    folder.parent_ref.child_refs != null) {
+                for (TupleFolderEx root : folder.parent_ref.child_refs)
+                    if ((!root.hide || show_hidden) && root.child_refs != null)
+                        for (TupleFolderEx child : root.child_refs)
+                            if (!child.hide || show_hidden) {
+                                root_childs_visible = true;
+                                break;
+                            }
+            } else
+                root_childs_visible = true;
+
             boolean childs_visible = false;
             if (folder.child_refs != null)
                 for (TupleFolderEx child : folder.child_refs)
@@ -165,49 +180,53 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             if (textSize != 0)
                 tvName.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
 
-            vwColor.setBackgroundColor(folder.accountColor == null ? Color.TRANSPARENT : folder.accountColor);
-            vwColor.setVisibility(account < 0 ? View.VISIBLE : View.GONE);
-
-            if (folder.sync_state == null || "requested".equals(folder.sync_state)) {
-                if (folder.executing > 0)
-                    ivState.setImageResource(R.drawable.baseline_dns_24);
-                else if ("waiting".equals(folder.state))
-                    ivState.setImageResource(R.drawable.baseline_hourglass_empty_24);
-                else if ("connected".equals(folder.state))
-                    ivState.setImageResource(R.drawable.baseline_cloud_24);
-                else if ("connecting".equals(folder.state))
-                    ivState.setImageResource(R.drawable.baseline_cloud_queue_24);
-                else if ("closing".equals(folder.state))
-                    ivState.setImageResource(R.drawable.baseline_close_24);
-                else if (folder.state == null)
-                    ivState.setImageResource(R.drawable.baseline_cloud_off_24);
-                else
-                    ivState.setImageResource(R.drawable.baseline_warning_24);
-            } else {
-                if ("syncing".equals(folder.sync_state))
-                    ivState.setImageResource(R.drawable.baseline_compare_arrows_24);
-                else if ("downloading".equals(folder.sync_state))
-                    ivState.setImageResource(R.drawable.baseline_cloud_download_24);
-                else
-                    ivState.setImageResource(R.drawable.baseline_warning_24);
-            }
-            ivState.setVisibility(
-                    folder.synchronize || folder.state != null || folder.sync_state != null
-                            ? View.VISIBLE : View.INVISIBLE);
+            if (listener == null) {
+                vwColor.setBackgroundColor(folder.accountColor == null ? Color.TRANSPARENT : folder.accountColor);
+                vwColor.setVisibility(account < 0 ? View.VISIBLE : View.GONE);
+
+                if (folder.sync_state == null || "requested".equals(folder.sync_state)) {
+                    if (folder.executing > 0)
+                        ivState.setImageResource(R.drawable.baseline_dns_24);
+                    else if ("waiting".equals(folder.state))
+                        ivState.setImageResource(R.drawable.baseline_hourglass_empty_24);
+                    else if ("connected".equals(folder.state))
+                        ivState.setImageResource(R.drawable.baseline_cloud_24);
+                    else if ("connecting".equals(folder.state))
+                        ivState.setImageResource(R.drawable.baseline_cloud_queue_24);
+                    else if ("closing".equals(folder.state))
+                        ivState.setImageResource(R.drawable.baseline_close_24);
+                    else if (folder.state == null)
+                        ivState.setImageResource(R.drawable.baseline_cloud_off_24);
+                    else
+                        ivState.setImageResource(R.drawable.baseline_warning_24);
+                } else {
+                    if ("syncing".equals(folder.sync_state))
+                        ivState.setImageResource(R.drawable.baseline_compare_arrows_24);
+                    else if ("downloading".equals(folder.sync_state))
+                        ivState.setImageResource(R.drawable.baseline_cloud_download_24);
+                    else
+                        ivState.setImageResource(R.drawable.baseline_warning_24);
+                }
+                ivState.setVisibility(
+                        folder.synchronize || folder.state != null || folder.sync_state != null
+                                ? View.VISIBLE : View.INVISIBLE);
 
-            ivReadOnly.setVisibility(folder.read_only ? View.VISIBLE : View.GONE);
+                ivReadOnly.setVisibility(folder.read_only ? View.VISIBLE : View.GONE);
+            }
 
             ViewGroup.LayoutParams lp = vwLevel.getLayoutParams();
             lp.width = (account < 0 ? 1 : level) * dp12;
             vwLevel.setLayoutParams(lp);
 
             ivExpander.setImageLevel(folder.collapsed ? 1 /* more */ : 0 /* less */);
-            ivExpander.setVisibility(account < 0
+            ivExpander.setVisibility(account < 0 || !root_childs_visible
                     ? View.GONE
                     : childs_visible ? View.VISIBLE : View.INVISIBLE);
 
-            ivNotify.setVisibility(folder.notify ? View.VISIBLE : View.GONE);
-            ivSubscribed.setVisibility(subscriptions && folder.subscribed != null && folder.subscribed ? View.VISIBLE : View.GONE);
+            if (listener == null) {
+                ivNotify.setVisibility(folder.notify ? View.VISIBLE : View.GONE);
+                ivSubscribed.setVisibility(subscriptions && folder.subscribed != null && folder.subscribed ? View.VISIBLE : View.GONE);
+            }
 
             if (folder.unseen > 0)
                 tvName.setText(context.getString(R.string.title_name_count,
@@ -219,60 +238,65 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             tvName.setTypeface(null, folder.unseen > 0 ? Typeface.BOLD : Typeface.NORMAL);
             tvName.setTextColor(folder.unseen > 0 ? colorUnread : textColorSecondary);
 
-            StringBuilder sb = new StringBuilder();
-            if (folder.account == null)
-                sb.append(nf.format(folder.messages));
-            else {
-                sb.append(nf.format(folder.content));
-                sb.append('/');
-                sb.append(nf.format(folder.messages));
-                sb.append('/');
-                if (folder.total == null)
-                    sb.append('?');
-                else
-                    sb.append(nf.format(folder.total));
-            }
-            tvMessages.setText(sb.toString());
+            if (listener == null) {
+                StringBuilder sb = new StringBuilder();
+                if (folder.account == null)
+                    sb.append(nf.format(folder.messages));
+                else {
+                    sb.append(nf.format(folder.content));
+                    sb.append('/');
+                    sb.append(nf.format(folder.messages));
+                    sb.append('/');
+                    if (folder.total == null)
+                        sb.append('?');
+                    else
+                        sb.append(nf.format(folder.total));
+                }
+                tvMessages.setText(sb.toString());
 
-            ivMessages.setImageResource(folder.download || EntityFolder.OUTBOX.equals(folder.type)
-                    ? R.drawable.baseline_mail_24 : R.drawable.baseline_mail_outline_24);
+                ivMessages.setImageResource(folder.download || EntityFolder.OUTBOX.equals(folder.type)
+                        ? R.drawable.baseline_mail_24 : R.drawable.baseline_mail_outline_24);
+            }
 
             ivType.setImageResource(EntityFolder.getIcon(folder.type));
-            ivUnified.setVisibility(account > 0 && folder.unified ? View.VISIBLE : View.GONE);
 
-            if (account < 0)
-                tvType.setText(folder.accountName);
-            else {
-                int resid = context.getResources().getIdentifier(
-                        "title_folder_" + folder.type.toLowerCase(),
-                        "string",
-                        context.getPackageName());
-                tvType.setText(resid > 0 ? context.getString(resid) : folder.type);
-            }
+            if (listener == null) {
+                ivUnified.setVisibility(account > 0 && folder.unified ? View.VISIBLE : View.GONE);
+
+                if (account < 0)
+                    tvType.setText(folder.accountName);
+                else {
+                    int resid = context.getResources().getIdentifier(
+                            "title_folder_" + folder.type.toLowerCase(),
+                            "string",
+                            context.getPackageName());
+                    tvType.setText(resid > 0 ? context.getString(resid) : folder.type);
+                }
 
-            if (folder.account == null) {
-                tvAfter.setText(null);
-                ivSync.setImageResource(R.drawable.baseline_sync_24);
-            } else {
-                StringBuilder a = new StringBuilder();
-                a.append(nf.format(folder.sync_days));
-                a.append('/');
-                if (folder.keep_days == Integer.MAX_VALUE)
-                    a.append('∞');
-                else
-                    a.append(nf.format(folder.keep_days));
-                tvAfter.setText(a.toString());
-                ivSync.setImageResource(folder.synchronize ? R.drawable.baseline_sync_24 : R.drawable.baseline_sync_disabled_24);
-            }
-            ivSync.setImageTintList(ColorStateList.valueOf(
-                    folder.synchronize && folder.initialize && !EntityFolder.OUTBOX.equals(folder.type)
-                            ? colorUnread : textColorSecondary));
+                if (folder.account == null) {
+                    tvAfter.setText(null);
+                    ivSync.setImageResource(R.drawable.baseline_sync_24);
+                } else {
+                    StringBuilder a = new StringBuilder();
+                    a.append(nf.format(folder.sync_days));
+                    a.append('/');
+                    if (folder.keep_days == Integer.MAX_VALUE)
+                        a.append('∞');
+                    else
+                        a.append(nf.format(folder.keep_days));
+                    tvAfter.setText(a.toString());
+                    ivSync.setImageResource(folder.synchronize ? R.drawable.baseline_sync_24 : R.drawable.baseline_sync_disabled_24);
+                }
+                ivSync.setImageTintList(ColorStateList.valueOf(
+                        folder.synchronize && folder.initialize && !EntityFolder.OUTBOX.equals(folder.type)
+                                ? colorUnread : textColorSecondary));
 
-            tvKeywords.setText(TextUtils.join(" ", folder.keywords));
-            tvKeywords.setVisibility(debug && folder.keywords.length > 0 ? View.VISIBLE : View.GONE);
+                tvKeywords.setText(TextUtils.join(" ", folder.keywords));
+                tvKeywords.setVisibility(debug && folder.keywords.length > 0 ? View.VISIBLE : View.GONE);
 
-            tvError.setText(folder.error);
-            tvError.setVisibility(folder.error != null ? View.VISIBLE : View.GONE);
+                tvError.setText(folder.error);
+                tvError.setVisibility(folder.error != null ? View.VISIBLE : View.GONE);
+            }
         }
 
         @Override
@@ -288,15 +312,24 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             if (view.getId() == R.id.ivExpander)
                 onCollapse(folder);
             else {
-                LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
-                lbm.sendBroadcast(
-                        new Intent(ActivityView.ACTION_VIEW_MESSAGES)
-                                .putExtra("account", folder.account)
-                                .putExtra("folder", folder.id));
+                if (listener == null) {
+                    LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+                    lbm.sendBroadcast(
+                            new Intent(ActivityView.ACTION_VIEW_MESSAGES)
+                                    .putExtra("account", folder.account)
+                                    .putExtra("folder", folder.id));
+                } else
+                    listener.onFolderSelected(folder);
             }
         }
 
         private void onCollapse(TupleFolderEx folder) {
+            if (listener != null) {
+                folder.collapsed = !folder.collapsed;
+                notifyDataSetChanged();
+                return;
+            }
+
             Bundle args = new Bundle();
             args.putLong("id", folder.id);
             args.putBoolean("collapsed", !folder.collapsed);
@@ -648,12 +681,13 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         }
     }
 
-    AdapterFolder(Context context, LifecycleOwner owner, long account, boolean show_hidden) {
+    AdapterFolder(Context context, LifecycleOwner owner, long account, boolean show_hidden, IFolderSelectedListener listener) {
         this.context = context;
         this.inflater = LayoutInflater.from(context);
         this.owner = owner;
         this.account = account;
         this.show_hidden = show_hidden;
+        this.listener = listener;
 
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         boolean compact = prefs.getBoolean("compact", false);
@@ -696,11 +730,18 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             }
         }
 
+        TupleFolderEx root = new TupleFolderEx();
+        root.child_refs = parents;
+        for (TupleFolderEx parent : parents)
+            parent.parent_ref = root;
+
         for (long pid : parentChilds.keySet()) {
             TupleFolderEx parent = idFolder.get(pid);
-            parent.child_refs = parentChilds.get(pid);
-            for (TupleFolderEx child : parent.child_refs)
-                child.parent_ref = parent;
+            if (parent != null) {
+                parent.child_refs = parentChilds.get(pid);
+                for (TupleFolderEx child : parent.child_refs)
+                    child.parent_ref = parent;
+            }
         }
 
         List<TupleFolderEx> hierarchical = getHierchical(parents);
@@ -783,7 +824,9 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             TupleFolderEx f1 = prev.get(oldItemPosition);
             TupleFolderEx f2 = next.get(newItemPosition);
             boolean e = f1.equals(f2);
-            if (!e || f1.parent_ref == null || f2.parent_ref == null)
+            if (!e ||
+                    f1.parent_ref == null || f1.parent_ref.id == null ||
+                    f2.parent_ref == null || f2.parent_ref.id == null)
                 return e;
             return f1.parent_ref.equals(f2.parent_ref);
         }
@@ -802,7 +845,9 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
     @Override
     @NonNull
     public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        return new ViewHolder(inflater.inflate(R.layout.item_folder, parent, false));
+        return new ViewHolder(inflater.inflate(
+                listener == null ? R.layout.item_folder : R.layout.item_folder_select,
+                parent, false));
     }
 
     @Override
@@ -819,4 +864,8 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
 
         holder.wire();
     }
+
+    interface IFolderSelectedListener {
+        void onFolderSelected(TupleFolderEx folder);
+    }
 }
diff --git a/app/src/main/java/eu/faircode/email/AdapterFolderSelect.java b/app/src/main/java/eu/faircode/email/AdapterFolderSelect.java
deleted file mode 100644
index 7b694467d6..0000000000
--- a/app/src/main/java/eu/faircode/email/AdapterFolderSelect.java
+++ /dev/null
@@ -1,184 +0,0 @@
-package eu.faircode.email;
-
-/*
-    This file is part of FairEmail.
-
-    FairEmail is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    FairEmail is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
-
-    Copyright 2018-2019 by Marcel Bokhorst (M66B)
-*/
-
-import android.content.Context;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.ImageView;
-import android.widget.TextView;
-
-import androidx.annotation.NonNull;
-import androidx.lifecycle.LifecycleOwner;
-import androidx.recyclerview.widget.DiffUtil;
-import androidx.recyclerview.widget.ListUpdateCallback;
-import androidx.recyclerview.widget.RecyclerView;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class AdapterFolderSelect extends RecyclerView.Adapter<AdapterFolderSelect.ViewHolder> {
-    private Context context;
-    private LifecycleOwner owner;
-    private IFolderSelectedListener listener;
-    private LayoutInflater inflater;
-
-    private List<EntityFolder> items = new ArrayList<>();
-
-    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
-        private View view;
-        private ImageView ivType;
-        private TextView tvName;
-
-        ViewHolder(View itemView) {
-            super(itemView);
-
-            view = itemView.findViewById(R.id.clItem);
-            ivType = itemView.findViewById(R.id.ivType);
-            tvName = itemView.findViewById(R.id.tvName);
-        }
-
-        private void wire() {
-            view.setOnClickListener(this);
-        }
-
-        private void unwire() {
-            view.setOnClickListener(null);
-        }
-
-        private void bindTo(EntityFolder folder) {
-            ivType.setImageResource(EntityFolder.getIcon(folder.type));
-            tvName.setText(folder.getDisplayName(context));
-        }
-
-        @Override
-        public void onClick(View v) {
-            int pos = getAdapterPosition();
-            if (pos == RecyclerView.NO_POSITION)
-                return;
-
-            EntityFolder folder = items.get(pos);
-            if (folder != null)
-                listener.onFolderSelected(folder);
-        }
-    }
-
-    AdapterFolderSelect(Context context, LifecycleOwner owner, IFolderSelectedListener listener) {
-        this.context = context;
-        this.owner = owner;
-        this.listener = listener;
-        this.inflater = LayoutInflater.from(context);
-        setHasStableIds(true);
-    }
-
-    public void set(@NonNull List<EntityFolder> folders) {
-        Log.i("Set folders=" + folders.size());
-
-        DiffUtil.DiffResult diff = DiffUtil.calculateDiff(new DiffCallback(items, folders), false);
-
-        items = folders;
-
-        diff.dispatchUpdatesTo(new ListUpdateCallback() {
-            @Override
-            public void onInserted(int position, int count) {
-                Log.i("Inserted @" + position + " #" + count);
-            }
-
-            @Override
-            public void onRemoved(int position, int count) {
-                Log.i("Removed @" + position + " #" + count);
-            }
-
-            @Override
-            public void onMoved(int fromPosition, int toPosition) {
-                Log.i("Moved " + fromPosition + ">" + toPosition);
-            }
-
-            @Override
-            public void onChanged(int position, int count, Object payload) {
-                Log.i("Changed @" + position + " #" + count);
-            }
-        });
-        diff.dispatchUpdatesTo(this);
-    }
-
-    private class DiffCallback extends DiffUtil.Callback {
-        private List<EntityFolder> prev = new ArrayList<>();
-        private List<EntityFolder> next = new ArrayList<>();
-
-        DiffCallback(List<EntityFolder> prev, List<EntityFolder> next) {
-            this.prev.addAll(prev);
-            this.next.addAll(next);
-        }
-
-        @Override
-        public int getOldListSize() {
-            return prev.size();
-        }
-
-        @Override
-        public int getNewListSize() {
-            return next.size();
-        }
-
-        @Override
-        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
-            EntityFolder m1 = prev.get(oldItemPosition);
-            EntityFolder m2 = next.get(newItemPosition);
-            return m1.id.equals(m2.id);
-        }
-
-        @Override
-        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
-            EntityFolder m1 = prev.get(oldItemPosition);
-            EntityFolder m2 = next.get(newItemPosition);
-            return m1.id.equals(m2.id);
-        }
-    }
-
-    @Override
-    public long getItemId(int position) {
-        return items.get(position).id;
-    }
-
-    @Override
-    public int getItemCount() {
-        return items.size();
-    }
-
-    @Override
-    @NonNull
-    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        return new ViewHolder(inflater.inflate(R.layout.item_folder_select, parent, false));
-    }
-
-    @Override
-    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
-        holder.unwire();
-        EntityFolder folder = items.get(position);
-        holder.bindTo(folder);
-        holder.wire();
-    }
-
-    interface IFolderSelectedListener {
-        void onFolderSelected(EntityFolder folder);
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/eu/faircode/email/AdapterMessage.java b/app/src/main/java/eu/faircode/email/AdapterMessage.java
index 2fac8d6be7..dbf01bf6c3 100644
--- a/app/src/main/java/eu/faircode/email/AdapterMessage.java
+++ b/app/src/main/java/eu/faircode/email/AdapterMessage.java
@@ -3063,49 +3063,50 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             LinearLayoutManager llm = new LinearLayoutManager(context);
             rvFolder.setLayoutManager(llm);
 
-            final AdapterFolderSelect adapter = new AdapterFolderSelect(context, owner, new AdapterFolderSelect.IFolderSelectedListener() {
-                @Override
-                public void onFolderSelected(EntityFolder folder) {
-                    dialog.dismiss();
+            final AdapterFolder adapter = new AdapterFolder(context, owner, data.message.account, false,
+                    new AdapterFolder.IFolderSelectedListener() {
+                        @Override
+                        public void onFolderSelected(TupleFolderEx folder) {
+                            dialog.dismiss();
 
-                    if (copy) {
-                        Bundle args = new Bundle();
-                        args.putLong("id", data.message.id);
-                        args.putLong("target", folder.id);
+                            if (copy) {
+                                Bundle args = new Bundle();
+                                args.putLong("id", data.message.id);
+                                args.putLong("target", folder.id);
 
-                        new SimpleTask<Void>() {
-                            @Override
-                            protected Void onExecute(Context context, Bundle args) {
-                                long id = args.getLong("id");
-                                long target = args.getLong("target");
+                                new SimpleTask<Void>() {
+                                    @Override
+                                    protected Void onExecute(Context context, Bundle args) {
+                                        long id = args.getLong("id");
+                                        long target = args.getLong("target");
 
-                                DB db = DB.getInstance(context);
-                                try {
-                                    db.beginTransaction();
+                                        DB db = DB.getInstance(context);
+                                        try {
+                                            db.beginTransaction();
 
-                                    EntityMessage message = db.message().getMessage(id);
-                                    if (message == null)
-                                        return null;
+                                            EntityMessage message = db.message().getMessage(id);
+                                            if (message == null)
+                                                return null;
 
-                                    EntityOperation.queue(context, message, EntityOperation.COPY, target);
+                                            EntityOperation.queue(context, message, EntityOperation.COPY, target);
 
-                                    db.setTransactionSuccessful();
-                                } finally {
-                                    db.endTransaction();
-                                }
+                                            db.setTransactionSuccessful();
+                                        } finally {
+                                            db.endTransaction();
+                                        }
 
-                                return null;
-                            }
+                                        return null;
+                                    }
 
-                            @Override
-                            protected void onException(Bundle args, Throwable ex) {
-                                Helper.unexpectedError(context, owner, ex);
-                            }
-                        }.execute(context, owner, args, "message:copy");
-                    } else
-                        properties.move(data.message.id, folder.name, false);
-                }
-            });
+                                    @Override
+                                    protected void onException(Bundle args, Throwable ex) {
+                                        Helper.unexpectedError(context, owner, ex);
+                                    }
+                                }.execute(context, owner, args, "message:copy");
+                            } else
+                                properties.move(data.message.id, folder.name, false);
+                        }
+                    });
 
             rvFolder.setAdapter(adapter);
 
@@ -3117,14 +3118,14 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             args.putLong("id", data.message.id);
             args.putBoolean("copy", copy);
 
-            new SimpleTask<List<EntityFolder>>() {
+            new SimpleTask<List<TupleFolderEx>>() {
                 @Override
-                protected List<EntityFolder> onExecute(Context context, Bundle args) {
+                protected List<TupleFolderEx> onExecute(Context context, Bundle args) {
                     long id = args.getLong("id");
                     boolean copy = args.getBoolean("copy");
 
                     EntityMessage message;
-                    List<EntityFolder> folders;
+                    List<TupleFolderEx> folders;
 
                     DB db = DB.getInstance(context);
                     try {
@@ -3134,7 +3135,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                         if (message == null)
                             return null;
 
-                        folders = db.folder().getFolders(message.account);
+                        folders = db.folder().getFoldersEx(message.account);
 
                         db.setTransactionSuccessful();
                     } finally {
@@ -3144,24 +3145,20 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     if (folders == null)
                         return null;
 
-                    List<EntityFolder> targets = new ArrayList<>();
-                    for (EntityFolder folder : folders)
-                        if (!folder.hide &&
-                                !folder.id.equals(message.folder) &&
+                    List<TupleFolderEx> targets = new ArrayList<>();
+                    for (TupleFolderEx folder : folders)
+                        if (!folder.id.equals(message.folder) &&
                                 (copy ||
                                         (!EntityFolder.ARCHIVE.equals(folder.type) &&
                                                 !EntityFolder.TRASH.equals(folder.type) &&
                                                 !EntityFolder.JUNK.equals(folder.type))))
                             targets.add(folder);
 
-                    if (targets.size() > 0)
-                        Collections.sort(targets, targets.get(0).getComparator(context));
-
                     return targets;
                 }
 
                 @Override
-                protected void onExecuted(final Bundle args, List<EntityFolder> folders) {
+                protected void onExecuted(final Bundle args, List<TupleFolderEx> folders) {
                     if (folders == null)
                         folders = new ArrayList<>();
 
diff --git a/app/src/main/java/eu/faircode/email/DaoFolder.java b/app/src/main/java/eu/faircode/email/DaoFolder.java
index b8e036ca37..086d1b5164 100644
--- a/app/src/main/java/eu/faircode/email/DaoFolder.java
+++ b/app/src/main/java/eu/faircode/email/DaoFolder.java
@@ -31,6 +31,19 @@ public interface DaoFolder {
     @Query("SELECT * FROM folder WHERE account = :account")
     List<EntityFolder> getFolders(long account);
 
+    @Query("SELECT folder.*" +
+            ", account.`order` AS accountOrder, account.name AS accountName, account.color AS accountColor, account.state AS accountState" +
+            ", COUNT(message.id) AS messages" +
+            ", SUM(CASE WHEN message.content = 1 THEN 1 ELSE 0 END) AS content" +
+            ", SUM(CASE WHEN message.ui_seen = 0 THEN 1 ELSE 0 END) AS unseen" +
+            ", (SELECT COUNT(operation.id) FROM operation WHERE operation.folder = folder.id AND operation.state = 'executing') AS executing" +
+            " FROM folder" +
+            " LEFT JOIN account ON account.id = folder.account" +
+            " LEFT JOIN message ON message.folder = folder.id AND NOT message.ui_hide" +
+            " WHERE folder.account = :account AND account.synchronize" +
+            " GROUP BY folder.id")
+    List<TupleFolderEx> getFoldersEx(long account);
+
     @Query("SELECT folder.* FROM folder" +
             " JOIN account ON account.id = folder.account" +
             " WHERE account.synchronize" +
diff --git a/app/src/main/java/eu/faircode/email/FragmentFolders.java b/app/src/main/java/eu/faircode/email/FragmentFolders.java
index 5d1258b52c..fb328f0558 100644
--- a/app/src/main/java/eu/faircode/email/FragmentFolders.java
+++ b/app/src/main/java/eu/faircode/email/FragmentFolders.java
@@ -144,7 +144,7 @@ public class FragmentFolders extends FragmentBase {
         itemDecorator.setDrawable(getContext().getDrawable(R.drawable.divider));
         rvFolder.addItemDecoration(itemDecorator);
 
-        adapter = new AdapterFolder(getContext(), getViewLifecycleOwner(), account, show_hidden);
+        adapter = new AdapterFolder(getContext(), getViewLifecycleOwner(), account, show_hidden, null);
         rvFolder.setAdapter(adapter);
 
         fab.setOnClickListener(new View.OnClickListener() {
diff --git a/app/src/main/java/eu/faircode/email/FragmentMessages.java b/app/src/main/java/eu/faircode/email/FragmentMessages.java
index 97b05af94d..3292ab4f3a 100644
--- a/app/src/main/java/eu/faircode/email/FragmentMessages.java
+++ b/app/src/main/java/eu/faircode/email/FragmentMessages.java
@@ -1389,19 +1389,15 @@ public class FragmentMessages extends FragmentBase {
                 result.accounts = db.account().getSynchronizingAccounts();
 
                 for (EntityAccount account : result.accounts) {
-                    List<EntityFolder> targets = new ArrayList<>();
-                    List<EntityFolder> folders = db.folder().getFolders(account.id);
-                    for (EntityFolder target : folders)
-                        if (!target.hide &&
+                    List<TupleFolderEx> targets = new ArrayList<>();
+                    List<TupleFolderEx> folders = db.folder().getFoldersEx(account.id);
+                    for (TupleFolderEx target : folders)
+                        if ((fids.size() != 1 || !fids.contains(target.id)) &&
                                 !EntityFolder.ARCHIVE.equals(target.type) &&
                                 !EntityFolder.TRASH.equals(target.type) &&
-                                !EntityFolder.JUNK.equals(target.type) &&
-                                (fids.size() != 1 || !fids.contains(target.id)))
+                                !EntityFolder.JUNK.equals(target.type))
                             targets.add(target);
 
-                    if (targets.size() > 0)
-                        Collections.sort(targets, targets.get(0).getComparator(context));
-
                     result.targets.put(account.id, targets);
                 }
 
@@ -1482,7 +1478,7 @@ public class FragmentMessages extends FragmentBase {
                                 return true;
                             case R.string.title_move_to_account:
                                 long account = target.getIntent().getLongExtra("account", -1);
-                                onActionMoveSelectionAccount(result.targets.get(account));
+                                onActionMoveSelectionAccount(account, result.targets.get(account));
                                 return true;
                             default:
                                 return false;
@@ -1833,7 +1829,7 @@ public class FragmentMessages extends FragmentBase {
         }.execute(FragmentMessages.this, args, "messages:move");
     }
 
-    private void onActionMoveSelectionAccount(List<EntityFolder> folders) {
+    private void onActionMoveSelectionAccount(long account, List<TupleFolderEx> folders) {
         final View dview = LayoutInflater.from(getContext()).inflate(R.layout.dialog_folder_select, null);
         final RecyclerView rvFolder = dview.findViewById(R.id.rvFolder);
         final ContentLoadingProgressBar pbWait = dview.findViewById(R.id.pbWait);
@@ -1847,10 +1843,10 @@ public class FragmentMessages extends FragmentBase {
         LinearLayoutManager llm = new LinearLayoutManager(getContext());
         rvFolder.setLayoutManager(llm);
 
-        final AdapterFolderSelect adapter = new AdapterFolderSelect(getContext(), getViewLifecycleOwner(),
-                new AdapterFolderSelect.IFolderSelectedListener() {
+        final AdapterFolder adapter = new AdapterFolder(getContext(), getViewLifecycleOwner(), account, false,
+                new AdapterFolder.IFolderSelectedListener() {
                     @Override
-                    public void onFolderSelected(EntityFolder folder) {
+                    public void onFolderSelected(TupleFolderEx folder) {
                         dialog.dismiss();
                         onActionMoveSelection(folder.id);
                     }
@@ -3308,7 +3304,7 @@ public class FragmentMessages extends FragmentBase {
         Boolean isJunk;
         Boolean isDrafts;
         List<EntityAccount> accounts;
-        Map<Long, List<EntityFolder>> targets = new HashMap<>();
+        Map<Long, List<TupleFolderEx>> targets = new HashMap<>();
     }
 
     private static class MessageTarget implements Parcelable {
diff --git a/app/src/main/res/layout/item_folder_select.xml b/app/src/main/res/layout/item_folder_select.xml
index 2adabe76b5..222bd57a28 100644
--- a/app/src/main/res/layout/item_folder_select.xml
+++ b/app/src/main/res/layout/item_folder_select.xml
@@ -11,6 +11,26 @@
         android:background="?attr/activatableItemBackground"
         android:padding="6dp">
 
+        <View
+            android:id="@+id/vwLevel"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <ImageView
+            android:id="@+id/ivExpander"
+            android:layout_width="36dp"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_vertical|center_horizontal"
+            android:contentDescription="@string/title_legend_expander"
+            android:padding="6dp"
+            android:src="@drawable/expander"
+            app:layout_constraintBottom_toBottomOf="@+id/tvName"
+            app:layout_constraintStart_toEndOf="@+id/vwLevel"
+            app:layout_constraintTop_toTopOf="@+id/tvName" />
+
         <ImageView
             android:id="@+id/ivType"
             android:layout_width="24dp"
@@ -18,7 +38,7 @@
             android:contentDescription="@string/title_legend_folder_tye"
             android:src="@drawable/baseline_inbox_24"
             app:layout_constraintBottom_toBottomOf="@+id/tvName"
-            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintStart_toEndOf="@+id/ivExpander"
             app:layout_constraintTop_toTopOf="@+id/tvName" />
 
         <TextView