main.cpp Example File | Active Qt 5.6

Qt 5.6 | Active Qt | Web Browser Example (ActiveQt) | main.cpp Example File

Qt 5.6.2 Reference Documentation

# main.cpp Example File

activeqt/webbrowser/main.cpp

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      ** modification, are permitted provided that the following conditions are
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      **   * Redistributions of source code must retain the above copyright
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      **     from this software without specific prior written permission.
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      #include <QApplication>
      #include <QMessageBox>
      #include <QProgressBar>
      #include <QLineEdit>
      #include <QLabel>
      #include <QStatusBar>
      #include <QMainWindow>
      #include <QDesktopWidget>
      #include <QAbstractEventDispatcher>
      #include <QSignalMapper>
      #include <QVariant>
      #include <QSettings>

      #include "ui_mainwindow.h"

      static const char qtUrl[] = "qt.io";
      static const char iWebBrowser2DocumentationUrl[] = "http://msdn.microsoft.com/en-us/library/aa752127%28v=vs.85%29.aspx";
      static const char versionKey[] = "Version";
      static const char geometryKey[] = "Geometry";

      struct Location {
          Location(const QString &t = QString(), const QString &a = QString()) : title(t), address(a) {}

          QString title;
          QString address;
      };

      Q_DECLARE_METATYPE(Location)

      static QList<Location> defaultBookmarks()
      {
          QList<Location> result;
          result.append(Location(QStringLiteral("Qt"), QLatin1String(qtUrl)));
          result.append(Location(QStringLiteral("Digia"), QStringLiteral("http://qt.digia.com/")));
          result.append(Location(QStringLiteral("IWebBrowser2 MSDN Documentation"), QLatin1String(iWebBrowser2DocumentationUrl)));
          return result;
      }

      static bool containsAddress(const QList<Location> &locations, const QString &address)
      {
          foreach (const Location &location, locations) {
              if (location.address == address)
                  return true;
          }
          return false;
      }

      static inline Location locationFromAction(const QAction *action)
      {
          return action->data().value<Location>();
      }

      static QList<Location> readBookMarks(QSettings &settings)
      {
          QList<Location> result;
          if (const int count = settings.beginReadArray(QStringLiteral("Bookmarks"))) {
              const QString titleKey = QStringLiteral("title");
              const QString addressKey = QStringLiteral("address");
              for (int i = 0; i < count; ++i) {
                  settings.setArrayIndex(i);
                  result.append(Location(settings.value(titleKey).toString(),
                                         settings.value(addressKey).toString()));
              }
          }
          settings.endArray();
          return result;
      }

      static void saveBookMarks(const QList<Location> &bookmarks, QSettings &settings)
      {
          const int count = bookmarks.size();
          settings.beginWriteArray(QStringLiteral("Bookmarks"));
          const QString titleKey = QStringLiteral("title");
          const QString addressKey = QStringLiteral("address");
          for (int i = 0; i < count; ++i) {
              settings.setArrayIndex(i);
              settings.setValue(titleKey, bookmarks.at(i).title);
              settings.setValue(addressKey, bookmarks.at(i).address);
          }
          settings.endArray();
      }

      class MainWindow : public QMainWindow, public Ui::MainWindow
      {
          Q_OBJECT
      public:
          MainWindow();
          ~MainWindow();

      public slots:
          void navigate(const QString &address);
          void on_WebBrowser_TitleChange(const QString &title);
          void on_WebBrowser_ProgressChange(int a, int b);
          void on_WebBrowser_CommandStateChange(int cmd, bool on);
          void on_WebBrowser_BeforeNavigate();
          void on_WebBrowser_NavigateComplete(const QString &address);

          void on_actionGo_triggered();
          void on_actionNewWindow_triggered();
          void on_actionAddBookmark_triggered();
          void on_actionAbout_triggered();
          void on_actionAboutQt_triggered();
          void on_actionFileClose_triggered();

      private:
          inline const QString address() const
              { return addressEdit->text().trimmed(); }
          QList<Location> bookmarks() const;
          QAction *addLocation(const Location &location, QMenu *menu);
          inline void addBookmark(const Location &location)
              { bookmarkActions << addLocation(location, BookmarksMenu); }

          QProgressBar *pb;
          QLineEdit *addressEdit;
          QList<QAction *> bookmarkActions;
          QList<QAction *> historyActions;
          QSignalMapper locationActionMapper;
      };

      MainWindow::MainWindow()
      {
          setupUi(this);

          addressEdit = new QLineEdit;
          tbAddress->insertWidget(actionGo, new QLabel(tr("Address")));
          tbAddress->insertWidget(actionGo, addressEdit);

          connect(addressEdit, SIGNAL(returnPressed()), actionGo, SLOT(trigger()));
          connect(actionBack, SIGNAL(triggered()), WebBrowser, SLOT(GoBack()));
          connect(actionForward, SIGNAL(triggered()), WebBrowser, SLOT(GoForward()));
          connect(actionStop, SIGNAL(triggered()), WebBrowser, SLOT(Stop()));
          connect(actionRefresh, SIGNAL(triggered()), WebBrowser, SLOT(Refresh()));
          connect(actionHome, SIGNAL(triggered()), WebBrowser, SLOT(GoHome()));
          connect(actionSearch, SIGNAL(triggered()), WebBrowser, SLOT(GoSearch()));

          pb = new QProgressBar(statusBar());
          pb->setTextVisible(false);
          pb->hide();
          statusBar()->addPermanentWidget(pb);

          connect(&locationActionMapper, SIGNAL(mapped(QString)), this, SLOT(navigate(QString)));

          QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                             QCoreApplication::organizationName(), QCoreApplication::applicationName());
          const QByteArray restoredGeometry = settings.value(QLatin1String(geometryKey)).toByteArray();
          if (restoredGeometry.isEmpty() || !restoreGeometry(restoredGeometry)) {
              const QRect availableGeometry = QApplication::desktop()->availableGeometry(this);
              const QSize size = (availableGeometry.size() * 4) / 5;
              resize(size);
              move(availableGeometry.center() - QPoint(size.width(), size.height()) / 2);
          }
          const QString restoredVersion = settings.value(QLatin1String(versionKey)).toString();
          QList<Location> bookmarks = readBookMarks(settings);
          if (bookmarks.isEmpty() || restoredVersion.isEmpty())
              bookmarks = defaultBookmarks();
          foreach (const Location &bookmark, bookmarks)
              addBookmark(bookmark);
      }

      MainWindow::~MainWindow()
      {
          QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                             QCoreApplication::organizationName(), QCoreApplication::applicationName());
          saveBookMarks(bookmarks(), settings);
          settings.setValue(QLatin1String(versionKey), QLatin1String(QT_VERSION_STR));
          settings.setValue(QLatin1String(geometryKey), saveGeometry());
      }

      QAction *MainWindow::addLocation(const Location &location, QMenu *menu)
      {
          QAction *action = menu->addAction(location.title);
          action->setData(QVariant::fromValue(location));
          locationActionMapper.setMapping(action, location.address);
          connect(action, SIGNAL(triggered()), &locationActionMapper, SLOT(map()));
          return action;
      }

      QList<Location> MainWindow::bookmarks() const
      {
          QList<Location> result;
          foreach (const QAction *action, bookmarkActions)
              result.append(locationFromAction(action));
          return result;
      }

      void MainWindow::on_actionAddBookmark_triggered()
      {
          if (!historyActions.isEmpty()) {
              const Location location = locationFromAction(historyActions.last());
              if (!containsAddress(bookmarks(), location.address))
                  addBookmark(location);
          }
      }

      void MainWindow::on_WebBrowser_TitleChange(const QString &title)
      {
          // This is called multiple times after NavigateComplete().
          // Add new URLs to history here.
          setWindowTitle("Qt WebBrowser - " + title);
          const QString currentAddress = address();
          const QString historyAddress = historyActions.isEmpty() ?
              QString() : locationFromAction(historyActions.last()).address;
          if (currentAddress.isEmpty() || currentAddress == "about:blank" || currentAddress == historyAddress)
              return;
          historyActions << addLocation(Location(title, currentAddress), HistoryMenu);
          if (historyActions.size() > 10)
              delete historyActions.takeFirst();
      }

      void MainWindow::on_WebBrowser_ProgressChange(int a, int b)
      {
          if (a <= 0 || b <= 0) {
              pb->hide();
              return;
          }
          pb->show();
          pb->setRange(0, b);
          pb->setValue(a);
      }

      void MainWindow::on_WebBrowser_CommandStateChange(int cmd, bool on)
      {
          switch (cmd) {
          case 1:
              actionForward->setEnabled(on);
              break;
          case 2:
              actionBack->setEnabled(on);
              break;
          }
      }

      void MainWindow::on_WebBrowser_BeforeNavigate()
      {
          actionStop->setEnabled(true);
      }

      void MainWindow::on_WebBrowser_NavigateComplete(const QString &url)
      {
          actionStop->setEnabled(false);
          const bool blocked = addressEdit->blockSignals(true);
          addressEdit->setText(url);
          addressEdit->blockSignals(blocked);
      }

      void MainWindow::on_actionGo_triggered()
      {
          navigate(address());
      }

      void MainWindow::navigate(const QString &url)
      {
          WebBrowser->dynamicCall("Navigate(const QString&)", url);
      }

      void MainWindow::on_actionNewWindow_triggered()
      {
          MainWindow *window = new MainWindow;
          window->show();
          if (addressEdit->text().isEmpty())
              return;
          window->addressEdit->setText(addressEdit->text());
          window->actionStop->setEnabled(true);
          window->on_actionGo_triggered();
      }

      void MainWindow::on_actionAbout_triggered()
      {
          QMessageBox::about(this, tr("About WebBrowser"),
                      tr("This Example has been created using the ActiveQt integration into Qt Designer.\n"
                         "It demonstrates the use of QAxWidget to embed the Internet Explorer ActiveX\n"
                         "control into a Qt application."));
      }

      void MainWindow::on_actionAboutQt_triggered()
      {
          QMessageBox::aboutQt(this, tr("About Qt"));
      }

      void MainWindow::on_actionFileClose_triggered()
      {
          close();
      }

      #include "main.moc"

      int main(int argc, char ** argv)
      {
          QApplication a(argc, argv);
          QCoreApplication::setApplicationVersion(QT_VERSION_STR);
          QCoreApplication::setApplicationName("Active Qt Web Browser");
          QCoreApplication::setOrganizationName("QtProject");
          MainWindow w;
          const QStringList arguments = QCoreApplication::arguments();
          const QString url = arguments.size() > 1 ?
              arguments.at(1) : QString::fromLatin1(qtUrl);
          w.navigate(url);
          w.show();
          return a.exec();
      }