main.cpp

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// ======================================================================
//  main.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 <QJSEngine>

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    QWidget*     pwgt = new QWidget;

    QLineEdit* ptxt = new QLineEdit;
    ptxt->setObjectName("lineedit");

    QLabel* plbl1 = new QLabel("1");
    plbl1->setObjectName("label1");

    QLabel* plbl2 = new QLabel("2");
    plbl2->setObjectName("label2");

    QLabel* plbl3 = new QLabel("3");
    plbl3->setObjectName("label3");

    QLabel* plbl4 = new QLabel("4");
    plbl4->setObjectName("label4");

    //Layout Setup
    QVBoxLayout* pvbxLayout = new QVBoxLayout;
    pvbxLayout->addWidget(ptxt);
    pvbxLayout->addWidget(plbl1);
    pvbxLayout->addWidget(plbl2);
    pvbxLayout->addWidget(plbl3);
    pvbxLayout->addWidget(plbl4);
    pwgt->setLayout(pvbxLayout);

    pwgt->show();

    //Script part
    QJSEngine se;
    QFile     file(":/script.js");
    if (file.open(QFile::ReadOnly)) {
        QJSValue sw = se.newQObject(pwgt);

        se.globalObject().setProperty("wgt", sw);

        QList<QObject*> lst = pwgt->findChildren<QObject*>();
        foreach(QObject* pobj, lst) {
            sw = se.newQObject(pobj);
            se.globalObject().setProperty(pobj->objectName(), sw);
        }

        QJSValue result = 
            se.evaluate(QLatin1String(file.readAll()));
        if (result.isError()) {
            QMessageBox::critical(0, 
                                  "Evaluating error", 
                                  result.toString(), 
                                  QMessageBox::Yes
                                 );
        }
    }
    else {
        QMessageBox::critical(0, 
                              "File open error", 
                              "Can not open the script file", 
                              QMessageBox::Yes
                             );
    }

    return app.exec();
}