MyProgram.cpp

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// ======================================================================
//  MyProgram.cpp --
// ======================================================================
//                   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
// ======================================================================

#include <QtWidgets>
#include "MyProgram.h"

// ----------------------------------------------------------------------
MyProgram::MyProgram(QWidget* pwgt/*=0*/)
    : QWidget(pwgt) 
    , m_settings("BHV","MyProgram")
{
    m_plbl = new QLabel;
    m_ptxt = new QTextEdit;
    m_pcbo = new QComboBox;
    m_pchk = new QCheckBox("Disable edit");

    m_pcbo->addItem("Classic");
    m_pcbo->addItem("Borland");


    connect(m_pchk, SIGNAL(clicked()), SLOT(slotCheckBoxClicked()));
    connect(m_pcbo, 
            SIGNAL(activated(int)), 
            SLOT(slotComboBoxActivated(int))
           );
    readSettings();

    //Layout setup
    QVBoxLayout* pvbxLayout = new QVBoxLayout;
    QHBoxLayout* phbxLayout = new QHBoxLayout;

    pvbxLayout->setContentsMargins(5, 5, 5, 5);
    phbxLayout->setSpacing(15);
    pvbxLayout->setSpacing(15);
    pvbxLayout->addWidget(m_plbl);
    pvbxLayout->addWidget(m_ptxt);
    phbxLayout->addWidget(m_pcbo);
    phbxLayout->addWidget(m_pchk);

    pvbxLayout->addLayout(phbxLayout);
    setLayout(pvbxLayout);

}


// ----------------------------------------------------------------------
/*virtual*/MyProgram::~MyProgram()
{
    writeSettings();
}

// ----------------------------------------------------------------------
void MyProgram::readSettings()
{
    m_settings.beginGroup("/Settings");

    QString strText    = m_settings.value("/text", "").toString();
    int     nWidth     = m_settings.value("/width", width()).toInt();
    int     nHeight    = m_settings.value("/height", height()).toInt();
    int     nComboItem = m_settings.value("/highlight", 0).toInt();
    bool    bEdit      = m_settings.value("/edit", false).toBool();

    m_nCounter = m_settings.value("/counter", 1).toInt();

    QString str = QString().setNum(m_nCounter++);
    m_plbl->setText("This program has been started " + str + " times");

    m_ptxt->setPlainText(strText);

    resize(nWidth, nHeight);

    m_pchk->setChecked(bEdit);
    slotCheckBoxClicked();
    
    m_pcbo->setCurrentIndex(nComboItem);
    slotComboBoxActivated(nComboItem);

    m_settings.endGroup();
}

// ----------------------------------------------------------------------
void MyProgram::writeSettings()
{
    m_settings.beginGroup("/Settings");
    m_settings.setValue("/counter", m_nCounter);
    m_settings.setValue("/text", m_ptxt->toPlainText());
    m_settings.setValue("/width", width());
    m_settings.setValue("/height", height());
    m_settings.setValue("/highlight", m_pcbo->currentIndex());
    m_settings.setValue("/edit", m_pchk->isChecked());
    m_settings.endGroup();
}

// ----------------------------------------------------------------------
void MyProgram::slotCheckBoxClicked()
{
    m_ptxt->setEnabled(!m_pchk->isChecked());
}

// ----------------------------------------------------------------------
void MyProgram::slotComboBoxActivated(int n)
{  
    QPalette pal = m_ptxt->palette();    
    pal.setColor(QPalette::Active, 
                 QPalette::Base, 
                 n ? Qt::darkBlue : Qt::white
                );
    pal.setColor(QPalette::Active, 
                 QPalette::Text, 
                 n ? Qt::yellow : Qt::black
                );
    m_ptxt->setPalette(pal);  
}