6b4994c265
This follows suit with aeb036e in qtbase. Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com> Reviewed-by: hjk <qthjk@ovi.com>
44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
The QML painting rate is calculated by the FrequencyMonitor class, which
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turns a stream of events (received via the notify() slot), into an
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instantaneous and an averaged frequency:
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\quotefromfile video/snippets/frequencymonitor/frequencymonitor.h
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\skipto class FrequencyMonitor : public QObject
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\printuntil Q_OBJECT
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\skipto Q_PROPERTY(qreal instantaneousFrequency
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\printuntil averageFrequencyChanged)
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\skipto public
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\printuntil :
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\dots
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\skipto static void qmlRegisterType
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\printuntil ;
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\skipto public slots
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\printuntil notify();
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\skipto };
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\printline };
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The FrequencyMonitor class is exposed to QML like this
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\quotefromfile video/snippets/frequencymonitor/frequencymonitordeclarative.cpp
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\skipto FrequencyMonitor::qmlRegisterType
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\printuntil }
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and its data is displayed by defining a QML item called FrequencyItem, like this:
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\quotefromfile video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml
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\skipto import FrequencyMonitor
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\printuntil id: root
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\dots
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\skipto function notify
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\printuntil id: monitor
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\skipto onAverageFrequencyChanged
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\printuntil {
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\skipto averageFrequencyText
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\printuntil /^\}/
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The result looks like this:
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\image video-qml-paint-rate.png
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