Undo move to archive/trash

Fixes #92

.idea/misc.xml

@@ -30,7 +30,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/build.gradle

@@ -87,6 +87,8 @@ dependencies {
     implementation "androidx.browser:browser:$androidx_version"
     implementation "androidx.constraintlayout:constraintlayout:$constraintlayout_version"
 
+    implementation "androidx.coordinatorlayout:coordinatorlayout:1.0.0-alpha1"
+
     implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
     annotationProcessor "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"
 

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

@@ -25,6 +25,7 @@ import android.content.SharedPreferences;
 import android.graphics.Canvas;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
+import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.text.TextUtils;
 import android.util.Log;
@@ -218,6 +219,7 @@ public class FragmentMessages extends FragmentEx {
                         DB db = DB.getInstance(context);
                         try {
                             db.beginTransaction();
+
                             EntityMessage message = db.message().getMessage(id);
                             EntityFolder folder = db.folder().getFolder(message.folder);
 
@@ -231,24 +233,86 @@ public class FragmentMessages extends FragmentEx {
                             }
 
                             db.message().setMessageUiHide(message.id, true);
-                            EntityOperation.queue(db, message, EntityOperation.MOVE, target.id);
 
                             db.setTransactionSuccessful();
                         } finally {
                             db.endTransaction();
                         }
 
-                        EntityOperation.process(context);
+                        Log.i(Helper.TAG, "Move id=" + id + " target=" + target);
 
                         return target.name;
                     }
 
                     @Override
-                    protected void onLoaded(Bundle args, String folder) {
+                    protected void onLoaded(final Bundle args, final String target) {
-                        Snackbar.make(
+                        final Snackbar snackbar = Snackbar.make(
                                 view,
-                                getString(R.string.title_moving, Helper.localizeFolderName(getContext(), folder)),
+                                getString(R.string.title_moving, Helper.localizeFolderName(getContext(), target)),
-                                Snackbar.LENGTH_SHORT).show();
+                                Snackbar.LENGTH_INDEFINITE);
+                        snackbar.setAction(R.string.title_undo, new View.OnClickListener() {
+                            @Override
+                            public void onClick(View v) {
+                                snackbar.dismiss();
+
+                                new SimpleTask<Void>() {
+                                    @Override
+                                    protected Void onLoad(Context context, Bundle args) {
+                                        long id = args.getLong("id");
+                                        Log.i(Helper.TAG, "Undo move id=" + id);
+                                        DB.getInstance(context).message().setMessageUiHide(id, false);
+                                        return null;
+                                    }
+
+                                    @Override
+                                    protected void onException(Bundle args, Throwable ex) {
+                                        super.onException(args, ex);
+                                    }
+                                }.load(FragmentMessages.this, args);
+                            }
+                        });
+                        snackbar.show();
+
+                        new Handler().postDelayed(new Runnable() {
+                            @Override
+                            public void run() {
+                                if (snackbar.isShown()) {
+                                    snackbar.dismiss();
+
+                                    args.putString("target", target);
+                                    new SimpleTask<Void>() {
+                                        @Override
+                                        protected Void onLoad(Context context, Bundle args) throws Throwable {
+                                            long id = args.getLong("id");
+                                            String target = args.getString("target");
+                                            Log.i(Helper.TAG, "Moving id=" + id + " target=" + target);
+
+                                            DB db = DB.getInstance(context);
+                                            try {
+                                                db.beginTransaction();
+
+                                                EntityMessage message = db.message().getMessage(id);
+                                                EntityFolder folder = db.folder().getFolderByName(message.account, target);
+                                                EntityOperation.queue(db, message, EntityOperation.MOVE, folder.id);
+
+                                                db.setTransactionSuccessful();
+                                            } finally {
+                                                db.endTransaction();
+                                            }
+
+                                            EntityOperation.process(context);
+
+                                            return null;
+                                        }
+
+                                        @Override
+                                        protected void onException(Bundle args, Throwable ex) {
+                                            super.onException(args, ex);
+                                        }
+                                    }.load(FragmentMessages.this, args);
+                                }
+                            }
+                        }, 5000);
                     }
 
                     @Override

app/src/main/res/layout/fragment_messages.xml

@@ -1,11 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".ActivityView">
 
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
         <TextView
             android:id="@+id/tvNoEmail"
             android:layout_width="wrap_content"
@@ -72,18 +76,6 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
 
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/fab"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="end|bottom"
-        android:layout_margin="16dp"
-        android:src="@drawable/baseline_edit_24"
-        android:tint="@color/colorActionForeground"
-        app:backgroundTint="?attr/colorAccent"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent" />
-
         <androidx.constraintlayout.widget.Group
             android:id="@+id/grpHintActions"
             android:layout_width="0dp"
@@ -95,4 +87,17 @@
             android:layout_width="0dp"
             android:layout_height="0dp"
             app:constraint_referenced_ids="rvFolder" />
-</androidx.constraintlayout.widget.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end|bottom"
+        android:layout_margin="16dp"
+        android:src="@drawable/baseline_edit_24"
+        android:tint="@color/colorActionForeground"
+        app:backgroundTint="?attr/colorAccent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -221,6 +221,7 @@
     <string name="title_issue">Do you have a question or problem?</string>
     <string name="title_yes">Yes</string>
     <string name="title_no">No</string>
+    <string name="title_undo">Undo</string>
 
     <string name="title_pro_feature">This is a pro feature</string>
     <string name="title_pro_list">List of pro features</string>