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88 lines
1.5 KiB
C++
88 lines
1.5 KiB
C++
/*
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* \brief Utility for implementing animated objects
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* \author Norman Feske
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* \date 2014-06-24
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*/
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/*
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* Copyright (C) 2014-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__GEMS__ANIMATOR_H_
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#define _INCLUDE__GEMS__ANIMATOR_H_
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/* Genode includes */
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#include <util/list.h>
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class Animator
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{
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public:
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class Item;
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private:
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friend class Item;
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Genode::List<Genode::List_element<Item> > _items { };
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public:
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inline void animate();
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bool active() const { return _items.first() != nullptr; }
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};
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/**
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* Interface to be implemented by animated objects
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*/
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class Animator::Item
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{
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private:
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Genode::List_element<Item> _element { this };
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Animator &_animator;
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bool _animated = false;
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public:
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Item(Animator &animator) : _animator(animator) { }
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virtual ~Item() { animated(false); }
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virtual void animate() = 0;
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void animated(bool animated)
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{
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if (animated == _animated)
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return;
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if (animated)
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_animator._items.insert(&_element);
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else
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_animator._items.remove(&_element);
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_animated = animated;
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}
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bool animated() const { return _animated; }
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};
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inline void Animator::animate()
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{
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for (Genode::List_element<Item> *item = _items.first(); item; ) {
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Genode::List_element<Item> *next = item->next();
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item->object()->animate();
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item = next;
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}
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}
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#endif /* _INCLUDE__GEMS__ANIMATOR_H_ */
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