mainwindow.cpp Example File

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  #include <QtWidgets>

  #include "pieview.h"
  #include "mainwindow.h"

  MainWindow::MainWindow()
  {
      QMenu *fileMenu = new QMenu(tr("&File"), this);
      QAction *openAction = fileMenu->addAction(tr("&Open..."));
      openAction->setShortcuts(QKeySequence::Open);
      QAction *saveAction = fileMenu->addAction(tr("&Save As..."));
      saveAction->setShortcuts(QKeySequence::SaveAs);
      QAction *quitAction = fileMenu->addAction(tr("E&xit"));
      quitAction->setShortcuts(QKeySequence::Quit);

      setupModel();
      setupViews();

      connect(openAction, &QAction::triggered, this, &MainWindow::openFile);
      connect(saveAction, &QAction::triggered, this, &MainWindow::saveFile);
      connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);

      menuBar()->addMenu(fileMenu);
      statusBar();

      loadFile(":/Charts/qtdata.cht");

      setWindowTitle(tr("Chart"));
      resize(870, 550);
  }

  void MainWindow::setupModel()
  {
      model = new QStandardItemModel(8, 2, this);
      model->setHeaderData(0, Qt::Horizontal, tr("Label"));
      model->setHeaderData(1, Qt::Horizontal, tr("Quantity"));
  }

  void MainWindow::setupViews()
  {
      QSplitter *splitter = new QSplitter;
      QTableView *table = new QTableView;
      pieChart = new PieView;
      splitter->addWidget(table);
      splitter->addWidget(pieChart);
      splitter->setStretchFactor(0, 0);
      splitter->setStretchFactor(1, 1);

      table->setModel(model);
      pieChart->setModel(model);

      QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
      table->setSelectionModel(selectionModel);
      pieChart->setSelectionModel(selectionModel);

      QHeaderView *headerView = table->horizontalHeader();
      headerView->setStretchLastSection(true);

      setCentralWidget(splitter);
  }

  void MainWindow::openFile()
  {
      const QString fileName =
          QFileDialog::getOpenFileName(this, tr("Choose a data file"), "", "*.cht");
      if (!fileName.isEmpty())
          loadFile(fileName);
  }

  void MainWindow::loadFile(const QString &fileName)
  {
      QFile file(fileName);
      if (!file.open(QFile::ReadOnly | QFile::Text))
          return;

      QTextStream stream(&file);
      QString line;

      model->removeRows(0, model->rowCount(QModelIndex()), QModelIndex());

      int row = 0;
      do {
          line = stream.readLine();
          if (!line.isEmpty()) {
              model->insertRows(row, 1, QModelIndex());

              QStringList pieces = line.split(',', QString::SkipEmptyParts);
              model->setData(model->index(row, 0, QModelIndex()),
                             pieces.value(0));
              model->setData(model->index(row, 1, QModelIndex()),
                             pieces.value(1));
              model->setData(model->index(row, 0, QModelIndex()),
                             QColor(pieces.value(2)), Qt::DecorationRole);
              row++;
          }
      } while (!line.isEmpty());

      file.close();
      statusBar()->showMessage(tr("Loaded %1").arg(fileName), 2000);
  }

  void MainWindow::saveFile()
  {
      QString fileName = QFileDialog::getSaveFileName(this,
          tr("Save file as"), "", "*.cht");

      if (fileName.isEmpty())
          return;

      QFile file(fileName);
      if (!file.open(QFile::WriteOnly | QFile::Text))
          return;

      QTextStream stream(&file);
      for (int row = 0; row < model->rowCount(QModelIndex()); ++row) {

          QStringList pieces;

          pieces.append(model->data(model->index(row, 0, QModelIndex()),
                                    Qt::DisplayRole).toString());
          pieces.append(model->data(model->index(row, 1, QModelIndex()),
                                    Qt::DisplayRole).toString());
          pieces.append(model->data(model->index(row, 0, QModelIndex()),
                                    Qt::DecorationRole).toString());

          stream << pieces.join(',') << "\n";
      }

      file.close();
      statusBar()->showMessage(tr("Saved %1").arg(fileName), 2000);
  }