mainwindow.cpp Example File

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

  #include <QDomDocument>
  #include <QTreeView>
  #include <QMenuBar>
  #include <QFileDialog>

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