mainwindow.cpp Example File

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 ** Contact: http://www.qt-project.org/legal
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 ** This file is part of the Qt Mobility Components.
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 #include "mainwindow.h"
 #include "ui_mainwindow.h"

 #include "textrecordeditor.h"
 #include "urirecordeditor.h"
 #include "mimeimagerecordeditor.h"

 #include <QtCore/QTime>
 #include <QtGui/QMenu>
 #include <QtGui/QVBoxLayout>
 #include <QtGui/QFrame>
 #include <QtGui/QLabel>
 #include <QtGui/QFileDialog>

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

 #include <QtCore/QDebug>

 class EmptyRecordLabel : public QLabel
 {
     Q_OBJECT

 public:
     EmptyRecordLabel() : QLabel(tr("Empty Record")) { }
     ~EmptyRecordLabel() { }

     void setRecord(const QNdefRecord &record)
     {
         Q_UNUSED(record);
     }

     QNdefRecord record() const
     {
         return QNdefRecord();
     }
 };

 class UnknownRecordLabel : public QLabel
 {
     Q_OBJECT

 public:
     UnknownRecordLabel() : QLabel(tr("Unknown Record Type")) { }
     ~UnknownRecordLabel() { }

     void setRecord(const QNdefRecord &record) { m_record = record; }
     QNdefRecord record() const { return m_record; }

 private:
     QNdefRecord m_record;
 };

 template <typename T>
 void addRecord(Ui::MainWindow *ui, const QNdefRecord &record = QNdefRecord())
 {
     QVBoxLayout *vbox = qobject_cast<QVBoxLayout *>(ui->scrollAreaWidgetContents->layout());
     if (!vbox)
         return;

     if (!vbox->isEmpty()) {
         QFrame *hline = new QFrame;
         hline->setFrameShape(QFrame::HLine);
         hline->setObjectName(QLatin1String("line-spacer"));

         vbox->addWidget(hline);
     }

     T *recordEditor = new T;
     recordEditor->setObjectName(QLatin1String("record-editor"));

     if (!record.isEmpty())
         recordEditor->setRecord(record);

     vbox->addWidget(recordEditor);
 }

 MainWindow::MainWindow(QWidget *parent)
 :   QMainWindow(parent), ui(new Ui::MainWindow), m_manager(new QNearFieldManager(this)),
     m_touchAction(NoAction)
 {
     ui->setupUi(this);

     QMenu *addRecordMenu = new QMenu(this);
     addRecordMenu->addAction(tr("NFC Text Record"), this, SLOT(addNfcTextRecord()));
     addRecordMenu->addAction(tr("NFC URI Record"), this, SLOT(addNfcUriRecord()));
     addRecordMenu->addAction(tr("MIME Image Record"), this, SLOT(addMimeImageRecord()));
     addRecordMenu->addAction(tr("Empty Record"), this, SLOT(addEmptyRecord()));
     ui->addRecord->setMenu(addRecordMenu);

     QVBoxLayout *vbox = new QVBoxLayout;
     ui->scrollAreaWidgetContents->setLayout(vbox);

     connect(m_manager, SIGNAL(targetDetected(QNearFieldTarget*)),
             this, SLOT(targetDetected(QNearFieldTarget*)));
     connect(m_manager, SIGNAL(targetLost(QNearFieldTarget*)),
             this, SLOT(targetLost(QNearFieldTarget*)));
 }

 MainWindow::~MainWindow()
 {
     delete ui;
 }

 void MainWindow::addNfcTextRecord()
 {
     addRecord<TextRecordEditor>(ui);
 }

 void MainWindow::addNfcUriRecord()
 {
     addRecord<UriRecordEditor>(ui);
 }

 void MainWindow::addMimeImageRecord()
 {
     addRecord<MimeImageRecordEditor>(ui);
 }

 void MainWindow::addEmptyRecord()
 {
     addRecord<EmptyRecordLabel>(ui);
 }

 void MainWindow::loadMessage()
 {
     QString filename = QFileDialog::getOpenFileName(this, tr("Select NDEF Message"));
     if (filename.isEmpty())
         return;

     QFile file(filename);
     if (!file.open(QIODevice::ReadOnly))
         return;

     QByteArray ndef = file.readAll();

     ndefMessageRead(QNdefMessage::fromByteArray(ndef));

     file.close();
 }

 void MainWindow::saveMessage()
 {
     QString filename = QFileDialog::getSaveFileName(this, tr("Select NDEF Message"));
     if (filename.isEmpty())
         return;

     QFile file(filename);
     if (!file.open(QIODevice::WriteOnly))
         return;

     file.write(ndefMessage().toByteArray());

     file.close();
 }

 void MainWindow::touchReceive()
 {
     ui->status->setStyleSheet(QLatin1String("background: blue"));

     m_touchAction = ReadNdef;

     m_manager->setTargetAccessModes(QNearFieldManager::NdefReadTargetAccess);
     m_manager->startTargetDetection();
 }

 void MainWindow::touchStore()
 {
     ui->status->setStyleSheet(QLatin1String("background: yellow"));

     m_touchAction = WriteNdef;

     m_manager->setTargetAccessModes(QNearFieldManager::NdefWriteTargetAccess);
     m_manager->startTargetDetection();
 }

 void MainWindow::targetDetected(QNearFieldTarget *target)
 {
     switch (m_touchAction) {
     case NoAction:
         break;
     case ReadNdef:
         connect(target, SIGNAL(ndefMessageRead(QNdefMessage)),
                 this, SLOT(ndefMessageRead(QNdefMessage)));
         connect(target, SIGNAL(error(QNearFieldTarget::Error,QNearFieldTarget::RequestId)),
                 this, SLOT(targetError(QNearFieldTarget::Error,QNearFieldTarget::RequestId)));

         m_request = target->readNdefMessages();
         break;
     case WriteNdef:
         connect(target, SIGNAL(ndefMessagesWritten()), this, SLOT(ndefMessageWritten()));
         connect(target, SIGNAL(error(QNearFieldTarget::Error,QNearFieldTarget::RequestId)),
                 this, SLOT(targetError(QNearFieldTarget::Error,QNearFieldTarget::RequestId)));

         m_request = target->writeNdefMessages(QList<QNdefMessage>() << ndefMessage());
         break;
     }
 }

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

 void MainWindow::ndefMessageRead(const QNdefMessage &message)
 {
     clearMessage();

     foreach (const QNdefRecord &record, message) {
         if (record.isRecordType<QNdefNfcTextRecord>()) {
             addRecord<TextRecordEditor>(ui, record);
         } else if (record.isRecordType<QNdefNfcUriRecord>()) {
             addRecord<UriRecordEditor>(ui, record);
         } else if (record.typeNameFormat() == QNdefRecord::Mime &&
                    record.type().startsWith("image/")) {
             addRecord<MimeImageRecordEditor>(ui, record);
         } else if (record.isEmpty()) {
             addRecord<EmptyRecordLabel>(ui);
         } else {
             addRecord<UnknownRecordLabel>(ui, record);
         }
     }

     ui->status->setStyleSheet(QString());
     m_manager->setTargetAccessModes(QNearFieldManager::NoTargetAccess);
     m_manager->stopTargetDetection();
     m_request = QNearFieldTarget::RequestId();
     ui->statusBar->clearMessage();
 }

 void MainWindow::ndefMessageWritten()
 {
     ui->status->setStyleSheet(QString());
     m_manager->setTargetAccessModes(QNearFieldManager::NoTargetAccess);
     m_manager->stopTargetDetection();
     m_request = QNearFieldTarget::RequestId();
     ui->statusBar->clearMessage();
 }

 void MainWindow::targetError(QNearFieldTarget::Error error, const QNearFieldTarget::RequestId &id)
 {
     Q_UNUSED(error);
     Q_UNUSED(id);

     if (m_request == id) {
         switch (error) {
         case QNearFieldTarget::NoError:
             ui->statusBar->clearMessage();
             break;
         case QNearFieldTarget::UnsupportedError:
             ui->statusBar->showMessage(tr("Unsupported tag"));
             break;
         case QNearFieldTarget::TargetOutOfRangeError:
             ui->statusBar->showMessage(tr("Tag removed from field"));
             break;
         case QNearFieldTarget::NoResponseError:
             ui->statusBar->showMessage(tr("No response from tag"));
             break;
         case QNearFieldTarget::ChecksumMismatchError:
             ui->statusBar->showMessage(tr("Checksum mismatch"));
             break;
         case QNearFieldTarget::InvalidParametersError:
             ui->statusBar->showMessage(tr("Invalid parameters"));
             break;
         case QNearFieldTarget::NdefReadError:
             ui->statusBar->showMessage(tr("NDEF read error"));
             break;
         case QNearFieldTarget::NdefWriteError:
             ui->statusBar->showMessage(tr("NDEF write error"));
             break;
         default:
             ui->statusBar->showMessage(tr("Unknown error"));
         }

         ui->status->setStyleSheet(QString());
         m_manager->setTargetAccessModes(QNearFieldManager::NoTargetAccess);
         m_manager->stopTargetDetection();
         m_request = QNearFieldTarget::RequestId();
     }
 }

 void MainWindow::clearMessage()
 {
     QWidget *scrollArea = ui->scrollAreaWidgetContents;

     qDeleteAll(scrollArea->findChildren<QWidget *>(QLatin1String("line-spacer")));
     qDeleteAll(scrollArea->findChildren<QWidget *>(QLatin1String("record-editor")));
 }

 QNdefMessage MainWindow::ndefMessage() const
 {
     QVBoxLayout *vbox = qobject_cast<QVBoxLayout *>(ui->scrollAreaWidgetContents->layout());
     if (!vbox)
         return QNdefMessage();

     QNdefMessage message;

     for (int i = 0; i < vbox->count(); ++i) {
         QWidget *widget = vbox->itemAt(i)->widget();

         if (TextRecordEditor *editor = qobject_cast<TextRecordEditor *>(widget)) {
             message.append(editor->record());
         } else if (UriRecordEditor *editor = qobject_cast<UriRecordEditor *>(widget)) {
             message.append(editor->record());
         } else if (MimeImageRecordEditor *editor = qobject_cast<MimeImageRecordEditor *>(widget)) {
             message.append(editor->record());
         } else if (qobject_cast<EmptyRecordLabel *>(widget)) {
             message.append(QNdefRecord());
         } else if (UnknownRecordLabel *label = qobject_cast<UnknownRecordLabel *>(widget)) {
             message.append(label->record());
         }
     }

     return message;
 }

 #include "mainwindow.moc"