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Diffstat (limited to 'examples/declarative/plugins/plugin.cpp')
-rw-r--r-- | examples/declarative/plugins/plugin.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/examples/declarative/plugins/plugin.cpp b/examples/declarative/plugins/plugin.cpp new file mode 100644 index 0000000..f4aa36b --- /dev/null +++ b/examples/declarative/plugins/plugin.cpp @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtDeclarative/qmlmoduleplugin.h> +#include <QtDeclarative/qml.h> +#include <qdebug.h> +#include <qdatetime.h> +#include <qbasictimer.h> +#include <qapplication.h> + +// Implements a "Time" 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 *) + { + 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; +}; + +class Time : public QObject +{ + Q_OBJECT + Q_PROPERTY(int hour READ hour NOTIFY timeChanged) + Q_PROPERTY(int minute READ minute NOTIFY timeChanged) + +public: + Time(QObject *parent=0) : QObject(parent) + { + if (++instances == 1) { + if (!timer) + timer = new MinuteTimer(qApp); + connect(timer, SIGNAL(timeChanged()), this, SIGNAL(timeChanged())); + timer->start(); + } + } + + ~Time() + { + 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 Time::instances=0; +MinuteTimer *Time::timer=0; + + +QML_DECLARE_TYPE(Time); + + +class QExampleQmlPlugin : public QmlModulePlugin +{ + Q_OBJECT +public: + QStringList keys() const + { + return QStringList() << QLatin1String("com.nokia.TimeExample"); + } + + void defineModule(const QString& uri) + { + Q_ASSERT(uri == QLatin1String("com.nokia.TimeExample")); + qmlRegisterType<Time>("com.nokia.TimeExample", 1, 0, "Time", "Time"); + } +}; + +#include "plugin.moc" + +Q_EXPORT_PLUGIN2(qtimeexampleqmlplugin, QExampleQmlPlugin); |