Core/Scripting: add the ability to access loot/go state changed events for gameobjects from cpp scripting. (malcrom's idea)

src/server/game/Entities/GameObject/GameObject.cpp

@@ -1910,6 +1910,7 @@ void GameObject::SetLootState(LootState state, Unit* unit)
 {
     m_lootState = state;
     AI()->OnStateChanged(state, unit);
+    sScriptMgr->OnGameObjectLootStateChanged(this, state, unit);
     if (m_model)
     {
         // startOpen determines whether we are going to add or remove the LoS on activation
@@ -1929,6 +1930,7 @@ void GameObject::SetLootState(LootState state, Unit* unit)
 void GameObject::SetGoState(GOState state)
 {
     SetByteValue(GAMEOBJECT_BYTES_1, 0, state);
+    sScriptMgr->OnGameObjectStateChanged(this, state);
     if (m_model)
     {
         if (!IsInWorld())

src/server/game/Scripting/ScriptMgr.cpp

@@ -937,6 +937,22 @@ void ScriptMgr::OnGameObjectDamaged(GameObject* go, Player* player)
     tmpscript->OnDamaged(go, player);
 }
 
+void ScriptMgr::OnGameObjectLootStateChanged(GameObject* go, uint32 state, Unit* unit)
+{
+    ASSERT(go);
+
+    GET_SCRIPT(GameObjectScript, go->GetScriptId(), tmpscript);
+    tmpscript->OnLootStateChanged(go, state, unit);
+}
+
+void ScriptMgr::OnGameObjectStateChanged(GameObject* go, uint32 state)
+{
+    ASSERT(go);
+
+    GET_SCRIPT(GameObjectScript, go->GetScriptId(), tmpscript);
+    tmpscript->OnGameObjectStateChanged(go, state);
+}
+
 void ScriptMgr::OnGameObjectUpdate(GameObject* go, uint32 diff)
 {
     ASSERT(go);

src/server/game/Scripting/ScriptMgr.h

@@ -473,6 +473,12 @@ class GameObjectScript : public ScriptObject, public UpdatableScript<GameObject>
         // Called when the game object is damaged (destructible buildings only).
         virtual void OnDamaged(GameObject* /*go*/, Player* /*player*/) { }
 
+        // Called when the game object loot state is changed.
+        virtual void OnLootStateChanged(GameObject* /*go*/, uint32 /*state*/, Unit* /*unit*/) { }
+
+        // Called when the game object state is changed.
+        virtual void OnGameObjectStateChanged(GameObject* /*go*/, uint32 /*state*/) { }
+
         // Called when a GameObjectAI object is needed for the gameobject.
         virtual GameObjectAI* GetAI(GameObject* /*go*/) const { return NULL; }
 };
@@ -914,6 +920,8 @@ class ScriptMgr
         uint32 GetDialogStatus(Player* player, GameObject* go);
         void OnGameObjectDestroyed(GameObject* go, Player* player);
         void OnGameObjectDamaged(GameObject* go, Player* player);
+        void OnGameObjectLootStateChanged(GameObject* go, uint32 state, Unit* unit);
+        void OnGameObjectStateChanged(GameObject* go, uint32 state);
         void OnGameObjectUpdate(GameObject* go, uint32 diff);
         GameObjectAI* GetGameObjectAI(GameObject* go);