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- /*
- * Copyright (C) 2017-2019 Christopher J. Howard
- *
- * This file is part of Antkeeper Source Code.
- *
- * Antkeeper Source Code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper Source Code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #ifndef COMPONENT_OBSERVER_HPP
- #define COMPONENT_OBSERVER_HPP
-
- #include "entity-id.hpp"
-
- class ComponentBase;
- class ComponentManager;
-
- /**
- * Abstract base class for component observers.
- */
- class ComponentObserver
- {
- public:
- /**
- * Creates a component observer.
- *
- * @param componentManager Specifies the component manager with which to associate this component observer.
- */
- ComponentObserver(ComponentManager* componentManager);
-
- /**
- * Destroys a component observer.
- */
- virtual ~ComponentObserver();
-
- protected:
- ComponentManager* componentManager;
-
- private:
- friend class ComponentManager;
-
- /**
- * Called after a component is added to an entity.
- *
- * @param entity Specifies the entity with which the component is associated.
- * @param component Specifies the component added.
- */
- virtual void componentAdded(EntityID entity, ComponentBase* component) = 0;
-
- /**
- * Called after a component is removed from an entity.
- *
- * @param entity Specifies the entity with which the component is associated.
- * @param component Specifies the component removed.
- */
- virtual void componentRemoved(EntityID entity, ComponentBase* component) = 0;
- };
-
- #endif // COMPONENT_OBSERVER_HPP
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