qt5base-lts/examples/widgets/itemviews/simpledommodel/mainwindow.cpp

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#include <QDomDocument>
#include <QFile>
#include <QtWidgets>

#include "dommodel.h"
#include "mainwindow.h"

MainWindow::MainWindow() : QMainWindow(), model(0)
{
    fileMenu = menuBar()->addMenu(tr("&File"));
    fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),
                        QKeySequence::Open);
    fileMenu->addAction(tr("E&xit"), this, SLOT(close()),
                        QKeySequence::Quit);

    model = new DomModel(QDomDocument(), this);
    view = new QTreeView(this);
    view->setModel(model);

    setCentralWidget(view);
    setWindowTitle(tr("Simple DOM Model"));
}

void MainWindow::openFile()
{
    QString filePath = QFileDialog::getOpenFileName(this, tr("Open File"),
        xmlPath, tr("XML files (*.xml);;HTML files (*.html);;"
                    "SVG files (*.svg);;User Interface files (*.ui)"));

    if (!filePath.isEmpty()) {
        QFile file(filePath);
        if (file.open(QIODevice::ReadOnly)) {
            QDomDocument document;
            if (document.setContent(&file)) {
                DomModel *newModel = new DomModel(document, this);
                view->setModel(newModel);
                delete model;
                model = newModel;
                xmlPath = filePath;
            }
            file.close();
        }
    }
}