Qt 5.8 | Qt Assistant Manual | Simple Text Viewer Example | mainwindow.cpp Example File

Qt 5.8.0 Reference Documentation

# mainwindow.cpp Example File

simpletextviewer/mainwindow.cpp

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      #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);
      }