Qt 5.9 | Qt Assistant Manual | Simple Text Viewer Example | mainwindow.cpp Example File

Qt 5.9.2 Reference Documentation

# mainwindow.cpp Example File

simpletextviewer/mainwindow.cpp

      /****************************************************************************
      **
      ** 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 <QtCore/QLibraryInfo>
      #include <QtWidgets/QApplication>
      #include <QtWidgets/QAction>
      #include <QtWidgets/QMenu>
      #include <QtWidgets/QMenuBar>
      #include <QtWidgets/QMessageBox>

      #include "mainwindow.h"
      #include "findfiledialog.h"
      #include "assistant.h"
      #include "textedit.h"

      // ![0]
      MainWindow::MainWindow()
      {
          assistant = new Assistant;
      // ![0]
          textViewer = new TextEdit;
          textViewer->setContents(QLibraryInfo::location(QLibraryInfo::ExamplesPath)
                  + QLatin1String("/assistant/simpletextviewer/documentation/intro.html"));
          setCentralWidget(textViewer);

          createActions();
          createMenus();

          setWindowTitle(tr("Simple Text Viewer"));
          resize(750, 400);
      // ![1]
      }

      void MainWindow::closeEvent(QCloseEvent *)
      {
          delete assistant;
      }

      void MainWindow::about()
      {
          QMessageBox::about(this, tr("About Simple Text Viewer"),
                             tr("This example demonstrates how to use\n"
                                "Qt Assistant as help system for your\n"
                                "own application."));
      }

      void MainWindow::showDocumentation()
      {
          assistant->showDocumentation("index.html");
      }

      void MainWindow::open()
      {
          FindFileDialog dialog(textViewer, assistant);
          dialog.exec();
      }

      void MainWindow::createActions()
      {
          assistantAct = new QAction(tr("Help Contents"), this);
          assistantAct->setShortcut(QKeySequence::HelpContents);
          connect(assistantAct, SIGNAL(triggered()), this, SLOT(showDocumentation()));

          openAct = new QAction(tr("&Open..."), this);
          openAct->setShortcut(QKeySequence::Open);
          connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

          clearAct = new QAction(tr("&Clear"), this);
          clearAct->setShortcut(tr("Ctrl+C"));
          connect(clearAct, SIGNAL(triggered()), textViewer, SLOT(clear()));

          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 = new QMenu(tr("&File"), this);
          fileMenu->addAction(openAct);
          fileMenu->addAction(clearAct);
          fileMenu->addSeparator();
          fileMenu->addAction(exitAct);

          helpMenu = new QMenu(tr("&Help"), this);
          helpMenu->addAction(assistantAct);
          helpMenu->addSeparator();
          helpMenu->addAction(aboutAct);
          helpMenu->addAction(aboutQtAct);

          menuBar()->addMenu(fileMenu);
          menuBar()->addMenu(helpMenu);
      }