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authorVenugopal Shivashankar <venugopal.shivashankar@nokia.com>2012-07-19 15:44:36 +0200
committerQt by Nokia <qt-info@nokia.com>2012-07-25 15:00:59 +0200
commitf930e088fca4150ed61b1bfca0ec2ad139743a67 (patch)
treec3b709c0bbb8236e7ab8daea59ff82abb2d591bd /src/multimedia/doc/src/examples/video-qml-paint-rate.qdocinc
parentef144b647f82634eec4d96bb141d1a46044cbd77 (diff)
Moved doc under src to fall in-line with the new modular structure
Change-Id: Ia2933baa1f0eaf82b5c2a626cb3661ee087049e3 Reviewed-by: Jerome Pasion <jerome.pasion@nokia.com>
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+The QML painting rate is calculated by the FrequencyMonitor class, which
+turns a stream of events (received via the notify() slot), into an
+instantaneous and an averaged frequency:
+
+\quotefromfile video/snippets/frequencymonitor/frequencymonitor.h
+\skipto class FrequencyMonitor : public QObject
+\printuntil Q_OBJECT
+\skipto Q_PROPERTY(qreal instantaneousFrequency
+\printuntil averageFrequencyChanged)
+\skipto public
+\printuntil :
+\dots
+\skipto static void qmlRegisterType
+\printuntil ;
+\skipto public slots
+\printuntil notify();
+\skipto };
+\printline };
+
+The FrequencyMonitor class is exposed to QML like this
+
+\quotefromfile video/snippets/frequencymonitor/frequencymonitordeclarative.cpp
+\skipto FrequencyMonitor::qmlRegisterType
+\printuntil }
+
+and its data is displayed by defining a QML item called FrequencyItem, like this:
+
+\quotefromfile video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml
+\skipto import FrequencyMonitor
+\printuntil id: root
+\dots
+\skipto function notify
+\printuntil id: monitor
+\skipto onAverageFrequencyChanged
+\printuntil {
+\skipto averageFrequencyText
+\printuntil /^\}/
+
+The result looks like this:
+
+\image video-qml-paint-rate.png
+
+