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Diffstat (limited to 'examples/multimedia/video/doc/src/video-qml-paint-rate.qdocinc')
| -rw-r--r-- | examples/multimedia/video/doc/src/video-qml-paint-rate.qdocinc | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/examples/multimedia/video/doc/src/video-qml-paint-rate.qdocinc b/examples/multimedia/video/doc/src/video-qml-paint-rate.qdocinc new file mode 100644 index 000000000..84098e241 --- /dev/null +++ b/examples/multimedia/video/doc/src/video-qml-paint-rate.qdocinc @@ -0,0 +1,43 @@ +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 + + |