qt-everywhere-src-5.14.1/qtconnectivity/examples/nfc/annotatedurl/annotatedurl.cpp

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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)
{
    //! [QNearFieldManager register handler]
    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*)));
    //! [QNearFieldManager register handler]

    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);
}

//! [handleMessage 1]
void AnnotatedUrl::handleMessage(const QNdefMessage &message, QNearFieldTarget *target)
{
//! [handleMessage 1]
    Q_UNUSED(target);

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

    QLocale defaultLocale;

    QString title;
    QUrl url;
    QPixmap pixmap;

//! [handleMessage 2]
    for (const QNdefRecord &record : message) {
        if (record.isRecordType<QNdefNfcTextRecord>()) {
            QNdefNfcTextRecord textRecord(record);

            title = textRecord.text();
            QLocale locale(textRecord.locale());
//! [handleMessage 2]
            // 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;
            }
//! [handleMessage 3]
        } 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()));
        }
//! [handleMessage 3]
//! [handleMessage 4]
    }

    emit annotatedUrl(url, title, pixmap);
}
//! [handleMessage 4]