- Qt 5.5
- Qt NFC
- Annotated URL Example
- annotatedurl.cpp Example File
- Qt 5.5.1 Reference Documentation

# annotatedurl.cpp Example File

annotatedurl/annotatedurl.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtNfc module.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** 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
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    **     the documentation and/or other materials provided with the
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #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>();
        int result = manager->registerNdefMessageHandler(filter, this,
                                           SLOT(handleMessage(QNdefMessage,QNearFieldTarget*)));

        if (result != -1)
            return;

        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);
    }