Qt 5.9 | Qt NFC | Annotated URL Example | annotatedurl.cpp Example File

Qt 5.9.9 Reference Documentation

# annotatedurl.cpp Example File

annotatedurl/annotatedurl.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2017 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the QtNfc module.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, 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 "annotatedurl.h"

      #include <qnearfieldmanager.h>
      #include <qnearfieldtarget.h>
      #include <qndefmessage.h>
      #include <qndefrecord.h>
      #include <qndefnfctextrecord.h>
      #include <qndefnfcurirecord.h>

      #include <QtCore/QUrl>
      #include <QtCore/QLocale>

      #include <QGridLayout>
      #include <QLabel>
      #include <QMouseEvent>
      #include <QDesktopServices>
      #include <QDebug>

      AnnotatedUrl::AnnotatedUrl(QObject *parent)
      :   QObject(parent)
      {
          manager = new QNearFieldManager(this);
          if (!manager->isAvailable()) {
              qWarning() << "NFC not available";
              return;
          }

          QNdefFilter filter;
          filter.setOrderMatch(false);
          filter.appendRecord<QNdefNfcTextRecord>(1, UINT_MAX);
          filter.appendRecord<QNdefNfcUriRecord>();
          // type parameter cannot specify substring so filter for "image/" below
          filter.appendRecord(QNdefRecord::Mime, QByteArray(), 0, 1);

          int result = manager->registerNdefMessageHandler(filter, this,
                                             SLOT(handleMessage(QNdefMessage,QNearFieldTarget*)));

          if (result < 0)
              qWarning() << "Platform does not support NDEF message handler registration";

          manager->startTargetDetection();
          connect(manager, SIGNAL(targetDetected(QNearFieldTarget*)),
                  this, SLOT(targetDetected(QNearFieldTarget*)));
          connect(manager, SIGNAL(targetLost(QNearFieldTarget*)),
                  this, SLOT(targetLost(QNearFieldTarget*)));
      }

      AnnotatedUrl::~AnnotatedUrl()
      {

      }

      void AnnotatedUrl::targetDetected(QNearFieldTarget *target)
      {
          if (!target)
              return;

          connect(target, SIGNAL(ndefMessageRead(QNdefMessage)),
                  this, SLOT(handlePolledNdefMessage(QNdefMessage)));
          target->readNdefMessages();
      }

      void AnnotatedUrl::targetLost(QNearFieldTarget *target)
      {
          if (target)
              target->deleteLater();
      }

      void AnnotatedUrl::handlePolledNdefMessage(QNdefMessage message)
      {
          QNearFieldTarget *target = qobject_cast<QNearFieldTarget *>(sender());
          handleMessage(message, target);
      }

      void AnnotatedUrl::handleMessage(const QNdefMessage &message, QNearFieldTarget *target)
      {
          Q_UNUSED(target);

          enum {
              MatchedNone,
              MatchedFirst,
              MatchedEnglish,
              MatchedLanguage,
              MatchedLanguageAndCountry
          } bestMatch = MatchedNone;

          QLocale defaultLocale;

          QString title;
          QUrl url;
          QPixmap pixmap;

          foreach (const QNdefRecord &record, message) {
              if (record.isRecordType<QNdefNfcTextRecord>()) {
                  QNdefNfcTextRecord textRecord(record);

                  title = textRecord.text();
                  QLocale locale(textRecord.locale());
                  // already found best match
                  if (bestMatch == MatchedLanguageAndCountry) {
                      // do nothing
                  } else if (bestMatch <= MatchedLanguage && locale == defaultLocale) {
                      bestMatch = MatchedLanguageAndCountry;
                  } else if (bestMatch <= MatchedEnglish &&
                             locale.language() == defaultLocale.language()) {
                      bestMatch = MatchedLanguage;
                  } else if (bestMatch <= MatchedFirst && locale.language() == QLocale::English) {
                      bestMatch = MatchedEnglish;
                  } else if (bestMatch == MatchedNone) {
                      bestMatch = MatchedFirst;
                  }
              } else if (record.isRecordType<QNdefNfcUriRecord>()) {
                  QNdefNfcUriRecord uriRecord(record);

                  url = uriRecord.uri();
              } else if (record.typeNameFormat() == QNdefRecord::Mime &&
                         record.type().startsWith("image/")) {
                  pixmap = QPixmap::fromImage(QImage::fromData(record.payload()));
              }
          }

          emit annotatedUrl(url, title, pixmap);
      }