Added World::ValidEntity for checking if an entity exists or not

include/Engine/Core/World.h

@@ -16,7 +16,8 @@ public:
     EntityID CreateEntity(EntityID parent = 0);
     // Delete entity and all components within
     void DeleteEntity(EntityID entity);
-
+    // Check if an entity exists
+    bool ValidEntity(EntityID entity) const;
     // Register a component type and allocate space for it
     void RegisterComponent(ComponentInfo& ci);
     // Attach a component to an entity and fill it with default values

src/Engine/Core/World.cpp

@@ -54,6 +54,11 @@ void World::DeleteEntity(EntityID entity)
     m_EntityNames.erase(entity);
 }
 
+bool World::ValidEntity(EntityID entity) const
+{
+    return m_EntityParents.find(entity) != m_EntityParents.end();
+}
+
 void World::RegisterComponent(ComponentInfo& ci)
 {
     if (m_ComponentPools.find(ci.Name) == m_ComponentPools.end()) {
@@ -75,7 +80,6 @@ ComponentWrapper World::AttachComponent(EntityID entity, std::string componentTy
     return c;
 }
 
-
 bool World::HasComponent(EntityID entity, std::string componentType) const
 {
     ComponentPool* pool = m_ComponentPools.at(componentType);
@@ -88,7 +92,6 @@ ComponentWrapper World::GetComponent(EntityID entity, std::string componentType)
     return pool->GetByEntity(entity);
 }
 
-
 void World::DeleteComponent(EntityID entity, std::string componentType)
 {
     ComponentPool* pool = m_ComponentPools.at(componentType);
@@ -102,13 +105,11 @@ const ComponentPool* World::GetComponents(std::string componentType)
     return (it != m_ComponentPools.end()) ? it->second : nullptr;
 }
 
-
 EntityID World::GetParent(EntityID entity)
 {
     return m_EntityParents.at(entity);
 }
 
-
 void World::SetParent(EntityID entity, EntityID parent)
 {
     EntityID lastParent = m_EntityParents.at(entity);

src/Engine/Editor/EditorSystem.cpp

@@ -622,7 +622,7 @@ bool EditorSystem::createEntityNode(World* world, EntityID entity)
             if (ImGui::Button("Delete")) {
                 world->DeleteEntity(entity);
                 ImGui::CloseCurrentPopup();
-                if (m_Selection == entity) {
+                if (!world->ValidEntity(m_Selection)) {
                     m_Selection = EntityID_Invalid;
                 }
             }