mainwindow.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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 "mainwindow.h"
  #include "xbeltree.h"

  MainWindow::MainWindow()
  {
      xbelTree = new XbelTree;
      setCentralWidget(xbelTree);

      createActions();
      createMenus();

      statusBar()->showMessage(tr("Ready"));

      setWindowTitle(tr("DOM Bookmarks"));
      resize(480, 320);
  }

  void MainWindow::open()
  {
      QString fileName =
              QFileDialog::getOpenFileName(this, tr("Open Bookmark File"),
                                           QDir::currentPath(),
                                           tr("XBEL Files (*.xbel *.xml)"));
      if (fileName.isEmpty())
          return;

      QFile file(fileName);
      if (!file.open(QFile::ReadOnly | QFile::Text)) {
          QMessageBox::warning(this, tr("SAX Bookmarks"),
                               tr("Cannot read file %1:\n%2.")
                               .arg(fileName)
                               .arg(file.errorString()));
          return;
      }

      if (xbelTree->read(&file))
          statusBar()->showMessage(tr("File loaded"), 2000);
  }

  void MainWindow::saveAs()
  {
      QString fileName =
              QFileDialog::getSaveFileName(this, tr("Save Bookmark File"),
                                           QDir::currentPath(),
                                           tr("XBEL Files (*.xbel *.xml)"));
      if (fileName.isEmpty())
          return;

      QFile file(fileName);
      if (!file.open(QFile::WriteOnly | QFile::Text)) {
          QMessageBox::warning(this, tr("SAX Bookmarks"),
                               tr("Cannot write file %1:\n%2.")
                               .arg(fileName)
                               .arg(file.errorString()));
          return;
      }

      if (xbelTree->write(&file))
          statusBar()->showMessage(tr("File saved"), 2000);
  }

  void MainWindow::about()
  {
     QMessageBox::about(this, tr("About DOM Bookmarks"),
                        tr("The <b>DOM Bookmarks</b> example demonstrates how to "
                           "use Qt's DOM classes to read and write XML "
                           "documents."));
  }

  void MainWindow::createActions()
  {
      openAct = new QAction(tr("&Open..."), this);
      openAct->setShortcuts(QKeySequence::Open);
      connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

      saveAsAct = new QAction(tr("&Save As..."), this);
      saveAsAct->setShortcuts(QKeySequence::SaveAs);
      connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

      exitAct = new QAction(tr("E&xit"), this);
      exitAct->setShortcuts(QKeySequence::Quit);
      connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

      aboutAct = new QAction(tr("&About"), this);
      connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

      aboutQtAct = new QAction(tr("About &Qt"), this);
      connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
  }

  void MainWindow::createMenus()
  {
      fileMenu = menuBar()->addMenu(tr("&File"));
      fileMenu->addAction(openAct);
      fileMenu->addAction(saveAsAct);
      fileMenu->addAction(exitAct);

      menuBar()->addSeparator();

      helpMenu = menuBar()->addMenu(tr("&Help"));
      helpMenu->addAction(aboutAct);
      helpMenu->addAction(aboutQtAct);
  }