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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "IntDegrees.h"
#include <wtf/CheckedRef.h>
#include <wtf/Vector.h>
namespace WebCore {
enum class VideoFrameRotation : uint16_t;
class OrientationNotifier final : public CanMakeCheckedPtr<OrientationNotifier> {
WTF_MAKE_TZONE_ALLOCATED(OrientationNotifier);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(OrientationNotifier);
public:
explicit OrientationNotifier(IntDegrees orientation) { m_orientation = orientation; }
~OrientationNotifier();
void orientationChanged(IntDegrees orientation);
void rotationAngleForCaptureDeviceChanged(const String&, VideoFrameRotation);
class Observer {
public:
virtual ~Observer();
virtual void orientationChanged(IntDegrees orientation) = 0;
virtual void rotationAngleForHorizonLevelDisplayChanged(const String&, VideoFrameRotation) { }
void setNotifier(OrientationNotifier*);
private:
OrientationNotifier* m_notifier { nullptr };
};
void addObserver(Observer&);
void removeObserver(Observer&);
IntDegrees orientation() const { return m_orientation; }
private:
Vector<std::reference_wrapper<Observer>> m_observers;
IntDegrees m_orientation;
};
inline OrientationNotifier::~OrientationNotifier()
{
for (Observer& observer : m_observers)
observer.setNotifier(nullptr);
}
inline OrientationNotifier::Observer::~Observer()
{
if (m_notifier)
m_notifier->removeObserver(*this);
}
inline void OrientationNotifier::Observer::setNotifier(OrientationNotifier* notifier)
{
if (m_notifier == notifier)
return;
if (m_notifier && notifier)
m_notifier->removeObserver(*this);
ASSERT(!m_notifier || !notifier);
m_notifier = notifier;
}
inline void OrientationNotifier::orientationChanged(IntDegrees orientation)
{
m_orientation = orientation;
for (Observer& observer : m_observers)
observer.orientationChanged(orientation);
}
inline void OrientationNotifier::rotationAngleForCaptureDeviceChanged(const String& devicePersistentId, VideoFrameRotation orientation)
{
for (Observer& observer : m_observers)
observer.rotationAngleForHorizonLevelDisplayChanged(devicePersistentId, orientation);
}
inline void OrientationNotifier::addObserver(Observer& observer)
{
m_observers.append(observer);
observer.setNotifier(this);
}
inline void OrientationNotifier::removeObserver(Observer& observer)
{
m_observers.removeFirstMatching([&observer](auto item) {
if (&observer != &item.get())
return false;
observer.setNotifier(nullptr);
return true;
});
}
} // namespace WebCore
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