Easy Beginner's Environment in QT Code

#include "unarybitpanel.h"
#include "settings.h"

#include <QLabel>

UnaryBitPanel::UnaryBitPanel(QWidget *parent)
    : QFrame(parent)
{
    setFrameStyle(QFrame::Panel | QFrame::Raised);
    setLineWidth(0);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->setSpacing(2);
    layout->setContentsMargins(10, 10, 10, 10);

    operatorCombo = new QComboBox(this);

    QStringList ops;
    ops << tr("!  Boolean not") << tr("-  Negative") << tr("~  Bitwise not");
    operatorCombo->addItems(ops);

    QHBoxLayout *opLayout = new QHBoxLayout;
    opLayout->addWidget(new QLabel(tr("Operator ")));
    opLayout->addWidget(operatorCombo);
    opLayout->addStretch();

    layout->addLayout(opLayout);

    table = new QTableWidget;

    //   input  do-it  format result comment
    table->setColumnCount(4);
    table->setRowCount(1);
    QStringList headers;
    headers << tr("Input") << tr("Operator") << tr("Result") << tr("Comment");
    table->setHorizontalHeaderLabels(headers);

    //number = new BinaryNumber;
    //number->setBits(32354,16);

    //layout->addWidget(number);

    input = new BinaryNumber;

    inputEdit = new IntegerEdit;

    fontSize = ebe["font_size"].toInt();
    table->setCellWidget(0, 0, inputEdit);
    table->setCellWidget(0, 2, input);
    table->setColumnWidth(0, 8 * fontSize);
    table->setColumnWidth(1, 8 * fontSize);
    table->setColumnWidth(2, 16 * fontSize + 5);
    table->setColumnWidth(3, 16 * fontSize);

    layout->addWidget(table);

    setLayout(layout);

    connect(operatorCombo, SIGNAL(activated(QString)), this,
        SLOT(selectOperator(QString)));

    selectOperator(tr("!  Boolean not"));

}

void UnaryBitPanel::setFontHeightAndWidth(int height, int width)
{
    fontHeight = height;
    fontWidth = width;
}

void UnaryBitPanel::selectOperator(QString o)
{
    input->clear();
    if (o[0] == QChar('!')) {
        op = o;
        doit = new QPushButton("!");
        table->setRowCount(1);
        table->setCellWidget(0, 1, doit);
        table->setCellWidget(0, 3, new QLabel(""));
        connect(doit, SIGNAL(clicked()), this, SLOT(notStep1()));
    } else if (o[0] == QChar('-')) {
        op = o;
        doit = new QPushButton("-");
        table->setRowCount(1);
        table->setCellWidget(0, 1, doit);
        table->setCellWidget(0, 3, new QLabel(""));
        connect(doit, SIGNAL(clicked()), this, SLOT(negateStep1()));
    } else if (o[0] == QChar('~')) {
        op = o;
        doit = new QPushButton("~");
        table->setRowCount(1);
        table->setCellWidget(0, 1, doit);
        table->setCellWidget(0, 3, new QLabel(""));
        connect(doit, SIGNAL(clicked()), this, SLOT(bitwiseNotStep1()));
    } else {
        qDebug() << tr("Unknown operator:") << o;
    }
}

void UnaryBitPanel::notStep1()
{
    value = inputEdit->value();
    input->setBits(value, 16);
    table->setCellWidget(0, 3, new QLabel(tr("Value converted to binary")));
    table->setRowCount(2);
    table->setCellWidget(0, 1, new QLabel(""));
    doit = new QPushButton("!");
    table->setCellWidget(1, 1, doit);
    connect(doit, SIGNAL(clicked()), this, SLOT(notStep2()));
}

void UnaryBitPanel::notStep2()
{
    output1 = new BinaryNumber;
    output1->setBits(!value, 8);
    table->setCellWidget(1, 2, output1);
    table->setCellWidget(1, 3, new QLabel(tr("Result as a binary bool")));
    table->setCellWidget(1, 1, new QLabel(""));
}

void UnaryBitPanel::bitwiseNotStep1()
{
    value = inputEdit->value();
    input->setBits(value, 16);
    table->setCellWidget(0, 3, new QLabel(tr("Value converted to binary")));
    table->setRowCount(2);
    table->setCellWidget(0, 1, new QLabel(""));
    doit = new QPushButton("~");
    table->setCellWidget(1, 1, doit);
    connect(doit, SIGNAL(clicked()), this, SLOT(bitwiseNotStep2()));
}

void UnaryBitPanel::bitwiseNotStep2()
{
    output1 = new BinaryNumber;
    output1->setBits(~value, 16);
    table->setCellWidget(1, 2, output1);
    table->setCellWidget(1, 3, new QLabel(tr("All bits flipped")));
    table->setCellWidget(1, 1, new QLabel(""));
}

void UnaryBitPanel::negateStep1()
{
    value = inputEdit->value();
    input->setBits(value, 16);
    table->setCellWidget(0, 3, new QLabel(tr("Value converted to binary")));
    table->setRowCount(2);
    table->setCellWidget(0, 1, new QLabel(""));
    doit = new QPushButton("-");
    table->setCellWidget(1, 1, doit);
    connect(doit, SIGNAL(clicked()), this, SLOT(negateStep2()));
}

void UnaryBitPanel::negateStep2()
{
    output1 = new BinaryNumber;
    output1->setBits(~value, 16);
    table->setRowCount(3);
    table->setCellWidget(1, 2, output1);
    table->setCellWidget(1, 3, new QLabel(tr("All bits flipped")));
    table->setCellWidget(1, 1, new QLabel(""));
    doit = new QPushButton("-");
    table->setCellWidget(2, 1, doit);
    connect(doit, SIGNAL(clicked()), this, SLOT(negateStep3()));
}

void UnaryBitPanel::negateStep3()
{
    add1 = new BinaryNumber;
    add1->setText("+ 1", 16);
    table->setCellWidget(2, 2, add1);
    table->setCellWidget(2, 3, new QLabel(tr("Adding 1")));
    table->setRowCount(4);
    table->setCellWidget(2, 1, new QLabel(""));
    doit = new QPushButton("-");
    table->setCellWidget(3, 1, doit);
    connect(doit, SIGNAL(clicked()), this, SLOT(negateStep4()));
}

void UnaryBitPanel::negateStep4()
{
    output2 = new BinaryNumber;
    output2->setBits(-value, 16);
    table->setCellWidget(3, 2, output2);
    table->setCellWidget(3, 3, new QLabel(tr("Twos complement")));
    table->setCellWidget(3, 1, new QLabel(""));
}