sendframebox.cpp Example File

can/sendframebox.cpp
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 ** Copyright (C) 2017 Andre Hartmann <aha_1980@gmx.de>
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 #include "sendframebox.h"
 #include "ui_sendframebox.h"

 enum {
     MaxStandardId = 0x7FF,
     MaxExtendedId = 0x10000000
 };

 enum {
     MaxPayload = 8,
     MaxPayloadFd = 64
 };

 HexIntegerValidator::HexIntegerValidator(QObject *parent) :
     QValidator(parent),
     m_maximum(MaxStandardId)
 {
 }

 QValidator::State HexIntegerValidator::validate(QString &input, int &) const
 {
     bool ok;
     uint value = input.toUInt(&ok, 16);

     if (input.isEmpty())
         return Intermediate;

     if (!ok || value > m_maximum)
         return Invalid;

     return Acceptable;
 }

 void HexIntegerValidator::setMaximum(uint maximum)
 {
     m_maximum = maximum;
 }

 HexStringValidator::HexStringValidator(QObject *parent) :
     QValidator(parent),
     m_maxLength(MaxPayload)
 {
 }

 QValidator::State HexStringValidator::validate(QString &input, int &pos) const
 {
     const int maxSize = 2 * m_maxLength;
     const QChar space = QLatin1Char(' ');
     QString data = input;
     data.remove(space);

     if (data.isEmpty())
         return Intermediate;

     // limit maximum size and forbid trailing spaces
     if ((data.size() > maxSize) || (data.size() == maxSize && input.endsWith(space)))
         return Invalid;

     // check if all input is valid
     const QRegularExpression re(QStringLiteral("^[[:xdigit:]]*$"));
     if (!re.match(data).hasMatch())
         return Invalid;

     // insert a space after every two hex nibbles
     const QRegularExpression insertSpace(QStringLiteral("(?:[[:xdigit:]]{2} )*[[:xdigit:]]{3}"));
     if (insertSpace.match(input).hasMatch()) {
         input.insert(input.size() - 1, space);
         pos = input.size();
     }

     return Acceptable;
 }

 void HexStringValidator::setMaxLength(int maxLength)
 {
     m_maxLength = maxLength;
 }

 SendFrameBox::SendFrameBox(QWidget *parent) :
     QGroupBox(parent),
     m_ui(new Ui::SendFrameBox)
 {
     m_ui->setupUi(this);

     m_hexIntegerValidator = new HexIntegerValidator(this);
     m_ui->frameIdEdit->setValidator(m_hexIntegerValidator);
     m_hexStringValidator = new HexStringValidator(this);
     m_ui->payloadEdit->setValidator(m_hexStringValidator);

     connect(m_ui->dataFrame, &QRadioButton::toggled, [this](bool set) {
         if (set)
             m_ui->flexibleDataRateBox->setEnabled(true);
     });

     connect(m_ui->remoteFrame, &QRadioButton::toggled, [this](bool set) {
         if (set) {
             m_ui->flexibleDataRateBox->setEnabled(false);
             m_ui->flexibleDataRateBox->setChecked(false);
         }
     });

     connect(m_ui->errorFrame, &QRadioButton::toggled, [this](bool set) {
         if (set) {
             m_ui->flexibleDataRateBox->setEnabled(false);
             m_ui->flexibleDataRateBox->setChecked(false);
         }
     });

     connect(m_ui->extendedFormatBox, &QCheckBox::toggled, [this](bool set) {
         m_hexIntegerValidator->setMaximum(set ? MaxExtendedId : MaxStandardId);
     });

     connect(m_ui->flexibleDataRateBox, &QCheckBox::toggled, [this](bool set) {
         m_hexStringValidator->setMaxLength(set ? MaxPayloadFd : MaxPayload);
         m_ui->bitrateSwitchBox->setEnabled(set);
         if (!set)
             m_ui->bitrateSwitchBox->setChecked(false);
     });

     auto frameIdTextChanged = [this]() {
         const bool hasFrameId = !m_ui->frameIdEdit->text().isEmpty();
         m_ui->sendButton->setEnabled(hasFrameId);
         m_ui->sendButton->setToolTip(hasFrameId
                                      ? QString() : tr("Cannot send because no Frame ID was given."));
     };
     connect(m_ui->frameIdEdit, &QLineEdit::textChanged, frameIdTextChanged);
     frameIdTextChanged();

     connect(m_ui->sendButton, &QPushButton::clicked, [this]() {
         const uint frameId = m_ui->frameIdEdit->text().toUInt(nullptr, 16);
         QString data = m_ui->payloadEdit->text();
         const QByteArray payload = QByteArray::fromHex(data.remove(QLatin1Char(' ')).toLatin1());

         QCanBusFrame frame = QCanBusFrame(frameId, payload);
         frame.setExtendedFrameFormat(m_ui->extendedFormatBox->isChecked());
         frame.setFlexibleDataRateFormat(m_ui->flexibleDataRateBox->isChecked());
         frame.setBitrateSwitch(m_ui->bitrateSwitchBox->isChecked());

         if (m_ui->errorFrame->isChecked())
             frame.setFrameType(QCanBusFrame::ErrorFrame);
         else if (m_ui->remoteFrame->isChecked())
             frame.setFrameType(QCanBusFrame::RemoteRequestFrame);

         emit sendFrame(frame);
     });
 }

 SendFrameBox::~SendFrameBox()
 {
     delete m_ui;
 }