106 lines
3.1 KiB
C++
106 lines
3.1 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Vector.h>
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namespace WebCore {
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class OrientationNotifier {
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public:
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explicit OrientationNotifier(int orientation) { m_orientation = orientation; }
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~OrientationNotifier();
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void orientationChanged(int orientation);
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class Observer {
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public:
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virtual ~Observer();
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virtual void orientationChanged(int orientation) = 0;
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void setNotifier(OrientationNotifier*);
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private:
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OrientationNotifier* m_notifier { nullptr };
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};
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void addObserver(Observer&);
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void removeObserver(Observer&);
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int orientation() const { return m_orientation; }
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private:
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Vector<std::reference_wrapper<Observer>> m_observers;
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int m_orientation;
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};
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inline OrientationNotifier::~OrientationNotifier()
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{
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for (Observer& observer : m_observers)
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observer.setNotifier(nullptr);
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}
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inline OrientationNotifier::Observer::~Observer()
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{
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if (m_notifier)
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m_notifier->removeObserver(*this);
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}
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inline void OrientationNotifier::Observer::setNotifier(OrientationNotifier* notifier)
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{
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if (m_notifier == notifier)
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return;
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if (m_notifier && notifier)
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m_notifier->removeObserver(*this);
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ASSERT(!m_notifier || !notifier);
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m_notifier = notifier;
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}
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inline void OrientationNotifier::orientationChanged(int orientation)
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{
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m_orientation = orientation;
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for (Observer& observer : m_observers)
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observer.orientationChanged(orientation);
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}
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inline void OrientationNotifier::addObserver(Observer& observer)
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{
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m_observers.append(observer);
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observer.setNotifier(this);
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}
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inline void OrientationNotifier::removeObserver(Observer& observer)
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{
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m_observers.removeFirstMatching([&observer](auto item) {
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if (&observer != &item.get())
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return false;
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observer.setNotifier(nullptr);
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return true;
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});
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}
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}
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