annotatedurl.cpp Example File

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  #include "annotatedurl.h"

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

  #include <QtWidgets/QGridLayout>
  #include <QtWidgets/QLabel>
  #include <QtGui/QMouseEvent>
  #include <QtGui/QDesktopServices>
  #include <QtCore/QDebug>
  #include <QtCore/QLocale>
  #include <QtCore/QUrl>

  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, &QNearFieldManager::targetDetected,
              this, &AnnotatedUrl::targetDetected);
      connect(manager, &QNearFieldManager::targetLost,
              this, &AnnotatedUrl::targetLost);
  }

  AnnotatedUrl::~AnnotatedUrl()
  {

  }

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

      connect(target, &QNearFieldTarget::ndefMessageRead,
              this, &AnnotatedUrl::handlePolledNdefMessage);
      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);
  }