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plugin.cpp 4.42 KiB
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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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**   * Redistributions of source code must retain the above copyright
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**     notice, this list of conditions and the following disclaimer.
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**   * Redistributions in binary form must reproduce the above copyright
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**     notice, this list of conditions and the following disclaimer in
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**     the documentation and/or other materials provided with the
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**     distribution.
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**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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**     of its contributors may be used to endorse or promote products derived
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**     from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtQml/QQmlExtensionPlugin>
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#include <QtQml/qqml.h>
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#include <qdebug.h>
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#include <qdatetime.h>
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#include <qbasictimer.h>
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#include <qcoreapplication.h>
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// Implements a "TimeModel" class with hour and minute properties
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// that change on-the-minute yet efficiently sleep the rest
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// of the time.
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class MinuteTimer : public QObject
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{
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    Q_OBJECT
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public:
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    MinuteTimer(QObject *parent) : QObject(parent)
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    {
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    }
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    void start()
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    {
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        if (!timer.isActive()) {
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            time = QTime::currentTime();
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            timer.start(60000-time.second()*1000, this);
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        }
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    }
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    void stop()
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    {
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        timer.stop();
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} int hour() const { return time.hour(); } int minute() const { return time.minute(); } signals: void timeChanged(); protected: void timerEvent(QTimerEvent *) { 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.addSecs(60); timer.start(60500, this); } else { time = now; timer.start(60000-time.second()*1000, this); } emit timeChanged(); } private: QTime time; QBasicTimer timer; }; //![0] class TimeModel : public QObject { Q_OBJECT Q_PROPERTY(int hour READ hour NOTIFY timeChanged) Q_PROPERTY(int minute READ minute NOTIFY timeChanged) //![0] public: TimeModel(QObject *parent=0) : QObject(parent) { if (++instances == 1) { if (!timer) timer = new MinuteTimer(QCoreApplication::instance()); connect(timer, SIGNAL(timeChanged()), this, SIGNAL(timeChanged())); timer->start(); } } ~TimeModel() { 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=0; //![plugin]
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class QExampleQmlPlugin : public QQmlExtensionPlugin { Q_OBJECT Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface") public: void registerTypes(const char *uri) { Q_ASSERT(uri == QLatin1String("TimeExample")); qmlRegisterType<TimeModel>(uri, 1, 0, "Time"); } }; //![plugin] #include "plugin.moc"