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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QDebug>
#include <QMediaService>
#include "qdeclarativetorch_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype Torch
\instantiates QDeclarativeTorch
\inqmlmodule QtMultimedia
\brief Simple control over torch functionality
\ingroup multimedia_qml
\c Torch is part of the \b{QtMultimedia 5.0} module.
In many cases the torch hardware is shared with camera flash functionality,
and might be automatically controlled by the device. You have control over
the power level (of course, higher power levels are brighter but reduce
battery life significantly).
\qml
import QtQuick 2.0
import QtMultimedia 5.0
Torch {
power: 75 // 75% of full power
enabled: true // On
}
\endqml
*/
QDeclarativeTorch::QDeclarativeTorch(QObject *parent)
: QObject(parent)
{
m_camera = new QCamera(this);
QMediaService *service = m_camera->service();
m_exposure = service ? service->requestControl<QCameraExposureControl*>() : 0;
m_flash = service ? service->requestControl<QCameraFlashControl*>() : 0;
if (m_exposure)
connect(m_exposure, SIGNAL(valueChanged(int)), SLOT(parameterChanged(int)));
// XXX There's no signal for flash mode changed
}
QDeclarativeTorch::~QDeclarativeTorch()
{
}
/*!
\qmlproperty bool QtMultimedia::Torch::enabled
This property indicates whether the torch is enabled. If the torch functionality is shared
with the camera flash hardware, the camera will take priority
over torch settings and the torch is disabled.
*/
/*!
\property QDeclarativeTorch::enabled
This property indicates whether the torch is enabled. If the torch functionality
is shared with the camera flash hardware, the camera will take
priority and the torch is disabled.
*/
bool QDeclarativeTorch::enabled() const
{
if (!m_flash)
return false;
return m_flash->flashMode() & QCameraExposure::FlashTorch;
}
/*!
If \a on is true, attempt to turn on the torch.
If the torch hardware is already in use by the camera, this will
be ignored.
*/
void QDeclarativeTorch::setEnabled(bool on)
{
if (!m_flash)
return;
QCameraExposure::FlashModes mode = m_flash->flashMode();
if (mode & QCameraExposure::FlashTorch) {
if (!on) {
m_flash->setFlashMode(mode & ~QCameraExposure::FlashTorch);
emit enabledChanged();
}
} else {
if (on) {
m_flash->setFlashMode(mode | QCameraExposure::FlashTorch);
emit enabledChanged();
}
}
}
/*!
\qmlproperty int QtMultimedia::Torch::power
This property holds the current torch power setting, as a percentage of full power.
In some cases this setting may change automatically as a result
of temperature or battery conditions.
*/
/*!
\property QDeclarativeTorch::power
This property holds the current torch power settings, as a percentage of full power.
*/
int QDeclarativeTorch::power() const
{
if (!m_exposure)
return 0;
return m_exposure->requestedValue(QCameraExposureControl::TorchPower).toInt();
}
/*!
Sets the current torch power setting to \a power, as a percentage of
full power.
*/
void QDeclarativeTorch::setPower(int power)
{
if (!m_exposure)
return;
power = qBound(0, power, 100);
if (this->power() != power)
m_exposure->setValue(QCameraExposureControl::TorchPower, power);
}
/* Check for changes in flash power */
void QDeclarativeTorch::parameterChanged(int parameter)
{
if (parameter == QCameraExposureControl::FlashPower) {
emit powerChanged();
}
}
QT_END_NAMESPACE
|
