Drag and drop entities partially working

docs/tasks/refactoring.todo

@@ -1,4 +1,22 @@
 
+Editor Action System:
+    - The main benefits of this are:
+        - 1: Central location for all actions (all action responsibilty goes to the editor class)
+        - 2: Actions are descretely organized into objects
+        - 3: allows for an action history with undo support
+
+    ☐ All actions should go through the main editor (or the asset editor ie. the tile map editor)
+        - Context menus can remain in the panel classes but the resulting actions should be sent to the appropriate editor
+        ☐ Actions should be encapsulated, command pattern?
+        ☐ Actions should be undoable
+            ☐ Concrete Action classes should have an undo implementation
+            ☐ Action History Stack in the Editor
+        ☐ Refactor all panels of the main editor to use the actions system
+            ☐ World Tree
+            ☐ Content Browser
+            ☐ World View
+            ☐ Properties View 
+
 
 ☐ Create base classes for serializeable objects
     ✔ JSON serializeable @done(22-08-12 19:19)

src/run_modes/editor/panels/world_tree.cpp

@@ -82,10 +82,37 @@ namespace lunarium { namespace editor
             return;
         }
 
+        // Drop onto panel itself?
+        // TODO: Nope this does not work for dropping onto the panel
+        // if (ImGui::BeginDragDropTarget())
+        // {
+        //     if (const ImGuiPayload *payload = ImGui::AcceptDragDropPayload("Entity"))
+        //     {
+        //         Entity *pDroppedEnt = *((Entity **)payload->Data);
+
+        //         if (pDroppedEnt->HasParent())
+        //             mpWorld->GetEntity(pDroppedEnt->GetParent())->RemoveChild(pDroppedEnt->GetUUID());
+                
+        //     }
+        //     ImGui::EndDragDropTarget();
+        // }
+
         ImGui::SetNextItemOpen(true);
 
         if (ImGui::TreeNode("World Root"))
         {
+            if (ImGui::BeginDragDropTarget())
+            {
+                if (const ImGuiPayload *payload = ImGui::AcceptDragDropPayload("Entity"))
+                {
+                    Entity *pDroppedEnt = *((Entity **)payload->Data);
+
+                    if (pDroppedEnt->HasParent())
+                        mpWorld->GetEntity(pDroppedEnt->GetParent())->RemoveChild(pDroppedEnt->GetUUID());
+                }
+                ImGui::EndDragDropTarget();
+            }
+
             // List all world entities
             int idx = 0;
             for (auto iter = mpWorld->EntitiesBegin(); !mpWorld->EntitiesIsEnd(iter); iter++, idx++)
@@ -113,37 +140,52 @@ namespace lunarium { namespace editor
     {
         bool was_clicked = false;
         bool was_right_clicked = false;
-        if (ImGui::TreeNode(pEnt->GetName().c_str()))
-        {
+
+        bool node_open = ImGui::TreeNode(pEnt->GetName().c_str());
+
+        // Handle drag and drop even if the node is closed
         if (ImGui::BeginDragDropSource())
         {
             // Need to pass a pointer to the payload data. This means we need to pass a
-                // pointer to the Entity pointer (Entity**) which &(*pEnt) becomes
-                ImGui::SetDragDropPayload("Entity", (void *)&(*pEnt), sizeof(Entity *));
+            // pointer to the Entity pointer (Entity**) which &pEnt becomes
+            ImGui::SetDragDropPayload("Entity", (void *)&pEnt, sizeof(Entity *));
             ImGui::Text("%s", pEnt->GetName().c_str());
             ImGui::EndDragDropSource();
         }
 
-            
         if (ImGui::BeginDragDropTarget())
         {
             if (const ImGuiPayload *payload = ImGui::AcceptDragDropPayload("Entity"))
             {
-                    Entity* pDroppedEnt = *((Entity**) payload->Data);
+                Entity *pDroppedEnt = *((Entity **)payload->Data);
 
                 // Can't drop and entity on itself
                 if (pDroppedEnt != pEnt)
                 {
                     // If the dropped ent is the parent of pEnt then we need to swap the relationship
+                    if (pEnt->HasParent() && pEnt->GetParent() == pDroppedEnt->GetUUID())
+                    {
+                        // TODO: Finish Entity Drop Logic
+                    }
 
                     // If the dropped ent is already a child of pEnt then we do nothing
 
                     // Else add dropped ent as a child of pEnt
+                    else if (!pDroppedEnt->HasParent() || (pDroppedEnt->GetParent() != pEnt->GetUUID()))
+                    {
+                        if (pDroppedEnt->HasParent())
+                            mpWorld->GetEntity(pDroppedEnt->GetParent())->RemoveChild(pDroppedEnt->GetUUID());
+
+                        pEnt->AddChild(pDroppedEnt->GetUUID());
+                    }
                 }
             }
             ImGui::EndDragDropTarget();
         }
 
+        // Now handle the node if it's open
+        if (node_open)
+        {
             was_clicked = ImGui::IsItemClicked(ImGuiMouseButton_Left);
             was_right_clicked = ImGui::IsItemClicked(ImGuiMouseButton_Right);
             

src/world/entity.cpp

@@ -59,6 +59,20 @@ namespace lunarium
         mName = name;
     }
 
+    bool Entity::HasParent()
+    {
+        return HasComponent<ParentEntityComponent>();
+    }
+
+    LUUID Entity::GetParent()
+    {
+        if (HasParent())
+        {
+            return GetComponent<ParentEntityComponent>().Parent;
+        }
+
+        return 0;
+    }
     
     bool Entity::HasChildren()
     {

src/world/entity.h

@@ -74,8 +74,8 @@ namespace lunarium // TODO: : public JSONSerializable
         void RemoveChild(LUUID child);
         std::vector<LUUID>& GetChildren();
 
-        // bool HasParent() const;
-        // LUUID GetParent() const;
+        bool HasParent();
+        LUUID GetParent();
         // void SetParent(LUUID parent);
         void ClearParent();