Qt 5.7 | Qt QML | Extending QML - Property Value Source Example | happybirthdaysong.cpp Example File

Qt 5.7.1 Reference Documentation

# happybirthdaysong.cpp Example File

referenceexamples/valuesource/happybirthdaysong.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/
      #include "happybirthdaysong.h"
      #include <QTimer>

      HappyBirthdaySong::HappyBirthdaySong(QObject *parent)
      : QObject(parent), m_line(-1)
      {
          setName(QString());
          QTimer *timer = new QTimer(this);
          QObject::connect(timer, &QTimer::timeout, this, &HappyBirthdaySong::advance);
          timer->start(1000);
      }

      void HappyBirthdaySong::setTarget(const QQmlProperty &p)
      {
          m_target = p;
      }

      QString HappyBirthdaySong::name() const
      {
          return m_name;
      }

      void HappyBirthdaySong::setName(const QString &name)
      {
          m_name = name;

          m_lyrics.clear();
          m_lyrics << "Happy birthday to you,";
          m_lyrics << "Happy birthday to you,";
          m_lyrics << "Happy birthday dear " + m_name + ",";
          m_lyrics << "Happy birthday to you!";
          m_lyrics << "";
      }

      void HappyBirthdaySong::advance()
      {
          m_line = (m_line + 1) % m_lyrics.count();

          m_target.write(m_lyrics.at(m_line));
      }