plugin.cpp Example File

qmlextensionplugins/plugin.cpp
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#include <QtQml/QQmlExtensionPlugin> #include <QtQml/qqml.h> #include <qdebug.h> #include <qdatetime.h> #include <qbasictimer.h> #include <qcoreapplication.h> // Implements a "TimeModel" class with hour and minute properties // that change on-the-minute yet efficiently sleep the rest // of the time. class MinuteTimer : public QObject { Q_OBJECT public: MinuteTimer(QObject *parent) : QObject(parent) { } void start() { if (!timer.isActive()) { time = QTime::currentTime(); timer.start(60000-time.second()*1000, this); } } void stop() { timer.stop(); } int hour() const { return time.hour(); } int minute() const { return time.minute(); } signals: void timeChanged(); protected: void timerEvent(QTimerEvent *) override { QTime now = QTime::currentTime(); if (now.second() == 59 && now.minute() == time.minute() && now.hour() == time.hour()) { // just missed time tick over, force it, wait extra 0.5 seconds time = time.addSecs(60); timer.start(60500, this); } else { time = now; timer.start(60000-time.second()*1000, this); } emit timeChanged(); } private: QTime time; QBasicTimer timer; }; class TimeModel : public QObject { Q_OBJECT Q_PROPERTY(int hour READ hour NOTIFY timeChanged) Q_PROPERTY(int minute READ minute NOTIFY timeChanged) public: TimeModel(QObject *parent=nullptr) : QObject(parent) { if (++instances == 1) { if (!timer) timer = new MinuteTimer(QCoreApplication::instance()); connect(timer, &MinuteTimer::timeChanged, this, &TimeModel::timeChanged); timer->start(); } } ~TimeModel() override { if (--instances == 0) { timer->stop(); } } int minute() const { return timer->minute(); } int hour() const { return timer->hour(); } signals: void timeChanged(); private: QTime t; static MinuteTimer *timer; static int instances; }; int TimeModel::instances=0; MinuteTimer *TimeModel::timer=nullptr; class QExampleQmlPlugin : public QQmlExtensionPlugin { Q_OBJECT Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid) public: void registerTypes(const char *uri) override { Q_ASSERT(uri == QLatin1String("TimeExample")); qmlRegisterType<TimeModel>(uri, 1, 0, "Time"); } }; #include "plugin.moc"