Shell.h

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// ======================================================================
//  Shell.h --
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#pragma once

#include <QtWidgets>

// ======================================================================
class Shell : public QWidget {
Q_OBJECT
private:
    QProcess*  m_process;
    QLineEdit* m_ptxtCommand;
    QTextEdit* m_ptxtDisplay;

public:
    // ------------------------------------------------------------------
    Shell(QWidget* pwgt = 0) : QWidget(pwgt)
    {
        m_process     = new QProcess(this);
        m_ptxtDisplay = new QTextEdit;

        QLabel* plbl = new QLabel("&Command:");

#ifdef Q_OS_WIN
        QString strCommand = "dir";
#else
        QString strCommand = "ls";
#endif

        m_ptxtCommand = new QLineEdit(strCommand);
        plbl->setBuddy(m_ptxtCommand);

        QPushButton* pcmd = new QPushButton("&Enter");

        connect(m_process, 
                SIGNAL(readyReadStandardOutput()), 
                SLOT(slotDataOnStdout())
               );
        connect(m_ptxtCommand, 
                SIGNAL(returnPressed()), 
                SLOT(slotReturnPressed())
               );
        connect(pcmd, SIGNAL(clicked()), SLOT(slotReturnPressed()));

        //Layout setup
        QHBoxLayout* phbxLayout = new QHBoxLayout;    
        phbxLayout->addWidget(plbl);
        phbxLayout->addWidget(m_ptxtCommand);
        phbxLayout->addWidget(pcmd);

        QVBoxLayout* pvbxLayout = new QVBoxLayout;    
        pvbxLayout->addWidget(m_ptxtDisplay);
        pvbxLayout->addLayout(phbxLayout);
        setLayout(pvbxLayout);
    }

public slots:
    // ------------------------------------------------------------------
    void slotDataOnStdout()
    {
        m_ptxtDisplay->append(m_process->readAllStandardOutput());
    }

    // ------------------------------------------------------------------
    void slotReturnPressed()
    {
        QString strCommand = "";
#ifdef Q_OS_WIN
        strCommand = "cmd /C ";
#endif
        strCommand += m_ptxtCommand->text();
        m_process->start(strCommand);
    }
};