Items/structures can be copied by holding ctrl in the editor

Subsurface/Source/Items/Item.cs

@@ -413,6 +413,28 @@ namespace Barotrauma
             ItemList.Add(this);
         }
 
+        public override MapEntity Clone()
+        {
+            Item clone = new Item(rect, prefab, Submarine);
+
+            foreach (KeyValuePair<string, ObjectProperty> property in properties)
+            {
+                if (!property.Value.Attributes.OfType<Editable>().Any()) continue;
+                clone.properties[property.Key].TrySetValue(property.Value.GetValue());
+            }
+
+            if (ContainedItems!=null)
+            {
+                foreach (Item containedItem in ContainedItems)
+                {
+                    var containedClone = containedItem.Clone();
+                    clone.ownInventory.TryPutItem(containedItem);
+                }
+            }
+
+            return clone;
+        }
+
         public T GetComponent<T>()
         {
             foreach (ItemComponent ic in components)

Subsurface/Source/Map/MapEntity.cs

@@ -10,7 +10,7 @@ using System.Collections.ObjectModel;
 
 namespace Barotrauma
 {
-    class MapEntity : Entity
+    abstract class MapEntity : Entity
     {
         public static List<MapEntity> mapEntityList = new List<MapEntity>();
         
@@ -149,7 +149,11 @@ namespace Barotrauma
                 if (aiTarget == null) return 0.0f;
                 return aiTarget.SoundRange;
             }
-            set { aiTarget.SoundRange = value; }
+            set
+            {
+                if (aiTarget == null) return;
+                aiTarget.SoundRange = value; 
+            }
         }
 
         public float SightRange
@@ -203,6 +207,22 @@ namespace Barotrauma
             return (Submarine.RectContains(WorldRect, position));
         }
 
+        public virtual MapEntity Clone()
+        {
+            return null;
+        }
+
+        public static List<MapEntity> Clone(List<MapEntity> entitiesToClone)
+        {
+            List<MapEntity> clones = new List<MapEntity>();
+            foreach (MapEntity e in entitiesToClone)
+            {
+                clones.Add(e.Clone());
+            }
+
+            return clones;
+        }
+        
         protected void InsertToList()
         {
             int i = 0;
@@ -341,22 +361,30 @@ namespace Barotrauma
             }
 
             //started moving selected entities
-            if (startMovingPos != Vector2.Zero)
+            if (startMovingPos != Vector2.Zero && PlayerInput.LeftButtonReleased())
             {
-                if (PlayerInput.LeftButtonReleased())
+                //mouse released -> move the entities to the new position of the mouse
+
+                Vector2 moveAmount = position - startMovingPos;
+                moveAmount = Submarine.VectorToWorldGrid(moveAmount);
+
+                if (moveAmount != Vector2.Zero)
                 {
-                    //mouse released -> move the entities to the new position of the mouse
+                    //clone
+                    if (PlayerInput.KeyDown(Keys.LeftControl) || PlayerInput.KeyDown(Keys.RightControl))
+                    {
+                        var clones = Clone(selectedList);
+                        clones.ForEach(c => c.Move(moveAmount));
 
-                    Vector2 moveAmount = position - startMovingPos;
+                        selectedList = clones;
-                    moveAmount = Submarine.VectorToWorldGrid(moveAmount);
+                    }
-
+                    else // move
-                    if (moveAmount != Vector2.Zero)
                     {
                         foreach (MapEntity e in selectedList) e.Move(moveAmount);
                     }
-
-                    startMovingPos = Vector2.Zero;
                 }
+
+                startMovingPos = Vector2.Zero;                
             }
             //started dragging a "selection rectangle"
             else if (selectionPos != Vector2.Zero)

Subsurface/Source/Map/Structure.cs

@@ -256,7 +256,6 @@ namespace Barotrauma
                 }
             }
 
-
             if (prefab.CastShadow)
             {
                 GenerateConvexHull();
@@ -265,6 +264,11 @@ namespace Barotrauma
             InsertToList();
         }
 
+        public override MapEntity Clone()
+        {
+            return new Structure(rect, prefab, Submarine);
+        }
+
         private void CreateStairBodies()
         {
             bodies = new List<Body>();

Subsurface/Source/Screens/EditMapScreen.cs

@@ -816,13 +816,7 @@ namespace Barotrauma
 
             if (GUIComponent.MouseOn == null)
             {
-                //if (nameBox.Selected && PlayerInput.LeftButtonClicked())
-                //{
-                //    ChangeSubName(nameBox, nameBox.Text);
-                //}
-
                 cam.MoveCamera((float)deltaTime);
-                //cam.Zoom = MathHelper.Clamp(cam.Zoom + (PlayerInput.ScrollWheelSpeed / 1000.0f)*cam.Zoom, 0.1f, 2.0f);
             }
 
             if (characterMode || wiringMode)
@@ -854,7 +848,6 @@ namespace Barotrauma
                     dummyCharacter.Submarine = Submarine.MainSub;
 
                     cam.TargetPos = Vector2.Zero;
-
                 }
             }
             else
@@ -907,9 +900,10 @@ namespace Barotrauma
                 foreach (Item item in dummyCharacter.SelectedItems)
                 {
                     if (item == null) continue;
-                    item.SetTransform(dummyCharacter.SimPosition, 0.0f);
 
+                    item.SetTransform(dummyCharacter.SimPosition, 0.0f);
                     item.Update(cam, (float)deltaTime);
+                    item.SetTransform(item.body.SimPosition, 0.0f);
                 }
 
                 if (dummyCharacter.SelectedConstruction != null)