mainwindow.cpp Example File | Qt Widgets 5.6

Qt 5.6 | Qt Widgets | Chart Example | mainwindow.cpp Example File

Qt 5.6.2 Reference Documentation

# mainwindow.cpp Example File

itemviews/chart/mainwindow.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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);
      }