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Diffstat (limited to 'examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h')
-rw-r--r-- | examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h new file mode 100644 index 000000000..f34646f9e --- /dev/null +++ b/examples/multimedia/video/snippets/frequencymonitor/frequencymonitor.h @@ -0,0 +1,102 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the Qt Mobility Components. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef FREQUENCYMONITOR_H +#define FREQUENCYMONITOR_H + +#include <QObject> +#include <QTimer> + +class FrequencyMonitorPrivate; + +/** + * Class for measuring frequency of events + * + * Occurrence of the event is notified by the client via the notify() slot. + * On a regular interval, both an instantaneous and a rolling average + * event frequency are calculated. + */ +class FrequencyMonitor : public QObject +{ + Q_OBJECT + Q_DECLARE_PRIVATE(FrequencyMonitor) + Q_PROPERTY(QString label READ label WRITE setLabel NOTIFY labelChanged) + Q_PROPERTY(bool active READ active WRITE setActive NOTIFY activeChanged) + Q_PROPERTY(int samplingInterval READ samplingInterval WRITE setSamplingInterval NOTIFY samplingIntervalChanged) + Q_PROPERTY(int traceInterval READ traceInterval WRITE setTraceInterval NOTIFY traceIntervalChanged) + Q_PROPERTY(qreal instantaneousFrequency READ instantaneousFrequency NOTIFY instantaneousFrequencyChanged) + Q_PROPERTY(qreal averageFrequency READ averageFrequency NOTIFY averageFrequencyChanged) + +public: + FrequencyMonitor(QObject *parent = 0); + ~FrequencyMonitor(); + + static void qmlRegisterType(); + + QString label() const; + bool active() const; + int samplingInterval() const; + int traceInterval() const; + qreal instantaneousFrequency() const; + qreal averageFrequency() const; + +signals: + void labelChanged(const QString &value); + void activeChanged(bool); + void samplingIntervalChanged(int value); + void traceIntervalChanged(int value); + void frequencyChanged(); + void instantaneousFrequencyChanged(qreal value); + void averageFrequencyChanged(qreal value); + +public slots: + Q_INVOKABLE void notify(); + Q_INVOKABLE void trace(); + void setActive(bool value); + void setLabel(const QString &value); + void setSamplingInterval(int value); + void setTraceInterval(int value); + +private: + FrequencyMonitorPrivate *d_ptr; +}; + +#endif // FREQUENCYMONITOR_H |