browserapplication.cpp Example File | Qt WebKit Examples 5.9

Qt 5.9 | Qt WebKit Examples | Tab Browser | browserapplication.cpp Example File

Qt 5.9.2 Reference Documentation

# browserapplication.cpp Example File

webkitwidgets/browser/browserapplication.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the demonstration applications of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 2.1 or version 3 as published by the Free
      ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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      #include "browserapplication.h"

      #include "bookmarks.h"
      #include "browsermainwindow.h"
      #include "cookiejar.h"
      #include "downloadmanager.h"
      #include "history.h"
      #include "networkaccessmanager.h"
      #include "tabwidget.h"
      #include "webview.h"

      #include <QtCore/QBuffer>
      #include <QtCore/QCommandLineParser>
      #include <QtCore/QDir>
      #include <QtCore/QLibraryInfo>
      #include <QtCore/QSettings>
      #include <QtCore/QTextStream>
      #include <QtCore/QTranslator>

      #include <QtGui/QDesktopServices>
      #include <QtGui/QFileOpenEvent>
      #include <QtWidgets/QMessageBox>

      #include <QtNetwork/QLocalServer>
      #include <QtNetwork/QLocalSocket>
      #include <QtNetwork/QNetworkProxy>
      #include <QtNetwork/QSslSocket>

      #include <QWebSettings>

      #include <QtCore/QDebug>

      DownloadManager *BrowserApplication::s_downloadManager = 0;
      HistoryManager *BrowserApplication::s_historyManager = 0;
      NetworkAccessManager *BrowserApplication::s_networkAccessManager = 0;
      BookmarksManager *BrowserApplication::s_bookmarksManager = 0;

      static void showHelp(QCommandLineParser &parser, const QString errorMessage = QString())
      {
          QString text;
          QTextStream str(&text);
          str << "<html><head/><body>";
          if (!errorMessage.isEmpty())
              str << errorMessage;
          str << "<pre>" << parser.helpText() << "</pre></body></html>";
          QMessageBox box(errorMessage.isEmpty() ? QMessageBox::Information : QMessageBox::Warning,
              QGuiApplication::applicationDisplayName(), text, QMessageBox::Ok);
          box.setTextInteractionFlags(Qt::TextBrowserInteraction);
          box.exec();
      }

      BrowserApplication::BrowserApplication(int &argc, char **argv)
          : QApplication(argc, argv)
          , m_localServer(0)
          , m_initialUrl(QString())
          , m_correctlyInitialized(false)
      {
          QCoreApplication::setOrganizationName(QLatin1String("Qt"));
          QCoreApplication::setApplicationName(QLatin1String("demobrowser"));
          QCoreApplication::setApplicationVersion(QLatin1String("0.1"));

          QCommandLineParser commandLineParser;
          commandLineParser.addPositionalArgument(QStringLiteral("url"),
              QStringLiteral("The url to be loaded in the browser window."));

          if (!commandLineParser.parse(QCoreApplication::arguments())) {
              showHelp(commandLineParser, QStringLiteral("<p>Invalid argument</p>"));
              return;
          }

          QStringList args = commandLineParser.positionalArguments();
          if (args.count() > 1) {
              showHelp(commandLineParser, QStringLiteral("<p>Too many arguments.</p>"));
              return;
          } else if (args.count() == 1) {
              m_initialUrl = args.at(0);
          }
          if (!m_initialUrl.isEmpty() && !QUrl::fromUserInput(m_initialUrl).isValid()) {
              showHelp(commandLineParser, QString("<p>%1 is not a valid url</p>").arg(m_initialUrl));
              return;
          }

          m_correctlyInitialized = true;

          QString serverName = QCoreApplication::applicationName()
              + QString::fromLatin1(QT_VERSION_STR).remove('.') + QLatin1String("webkit");
          QLocalSocket socket;
          socket.connectToServer(serverName);
          if (socket.waitForConnected(500)) {
              QTextStream stream(&socket);
              stream << m_initialUrl;
              stream.flush();
              socket.waitForBytesWritten();
              return;
          }

      #if defined(Q_OS_OSX)
          QApplication::setQuitOnLastWindowClosed(false);
      #else
          QApplication::setQuitOnLastWindowClosed(true);
      #endif

          m_localServer = new QLocalServer(this);
          connect(m_localServer, SIGNAL(newConnection()),
                  this, SLOT(newLocalSocketConnection()));
          if (!m_localServer->listen(serverName)) {
              if (m_localServer->serverError() == QAbstractSocket::AddressInUseError
                  && QFile::exists(m_localServer->serverName())) {
                  QFile::remove(m_localServer->serverName());
                  m_localServer->listen(serverName);
              }
          }

      #ifndef QT_NO_OPENSSL
          if (!QSslSocket::supportsSsl()) {
          QMessageBox::information(0, "Demo Browser",
                       "This system does not support OpenSSL. SSL websites will not be available.");
          }
      #endif

          QDesktopServices::setUrlHandler(QLatin1String("http"), this, "openUrl");
          QString localSysName = QLocale::system().name();

          installTranslator(QLatin1String("qt_") + localSysName);

          QSettings settings;
          settings.beginGroup(QLatin1String("sessions"));
          m_lastSession = settings.value(QLatin1String("lastSession")).toByteArray();
          settings.endGroup();

      #if defined(Q_OS_OSX)
          connect(this, SIGNAL(lastWindowClosed()),
                  this, SLOT(lastWindowClosed()));
      #endif

          QTimer::singleShot(0, this, SLOT(postLaunch()));
      }

      BrowserApplication::~BrowserApplication()
      {
          delete s_downloadManager;
          for (int i = 0; i < m_mainWindows.size(); ++i) {
              BrowserMainWindow *window = m_mainWindows.at(i);
              delete window;
          }
          delete s_networkAccessManager;
          delete s_bookmarksManager;
      }

      #if defined(Q_OS_OSX)
      void BrowserApplication::lastWindowClosed()
      {
          clean();
          BrowserMainWindow *mw = new BrowserMainWindow;
          mw->slotHome();
          m_mainWindows.prepend(mw);
      }
      #endif

      BrowserApplication *BrowserApplication::instance()
      {
          return (static_cast<BrowserApplication *>(QCoreApplication::instance()));
      }

      #if defined(Q_OS_OSX)
      #include <QtWidgets/QMessageBox>
      void BrowserApplication::quitBrowser()
      {
          clean();
          int tabCount = 0;
          for (int i = 0; i < m_mainWindows.count(); ++i) {
              tabCount += m_mainWindows.at(i)->tabWidget()->count();
          }

          if (tabCount > 1) {
              int ret = QMessageBox::warning(mainWindow(), QString(),
                                 tr("There are %1 windows and %2 tabs open\n"
                                    "Do you want to quit anyway?").arg(m_mainWindows.count()).arg(tabCount),
                                 QMessageBox::Yes | QMessageBox::No,
                                 QMessageBox::No);
              if (ret == QMessageBox::No)
                  return;
          }

          exit(0);
      }
      #endif

      /*!
          Any actions that can be delayed until the window is visible
       */
      void BrowserApplication::postLaunch()
      {
          QString directory = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
          if (directory.isEmpty())
              directory = QDir::homePath() + QLatin1String("/.") + QCoreApplication::applicationName();
          QWebSettings::setIconDatabasePath(directory);
          QWebSettings::setOfflineStoragePath(directory);

          setWindowIcon(QIcon(QLatin1String(":browser.svg")));

          loadSettings();

          // newMainWindow() needs to be called in main() for this to happen
          if (m_mainWindows.count() > 0) {
              if (!m_initialUrl.isEmpty())
                  mainWindow()->loadPage(m_initialUrl);
              else
                  mainWindow()->slotHome();
          }
          BrowserApplication::historyManager();
      }

      void BrowserApplication::loadSettings()
      {
          QSettings settings;
          settings.beginGroup(QLatin1String("websettings"));

          QWebSettings *defaultSettings = QWebSettings::globalSettings();
          QString standardFontFamily = defaultSettings->fontFamily(QWebSettings::StandardFont);
          int standardFontSize = defaultSettings->fontSize(QWebSettings::DefaultFontSize);
          QFont standardFont = QFont(standardFontFamily, standardFontSize);
          standardFont = qvariant_cast<QFont>(settings.value(QLatin1String("standardFont"), standardFont));
          defaultSettings->setFontFamily(QWebSettings::StandardFont, standardFont.family());
          defaultSettings->setFontSize(QWebSettings::DefaultFontSize, standardFont.pointSize());

          QString fixedFontFamily = defaultSettings->fontFamily(QWebSettings::FixedFont);
          int fixedFontSize = defaultSettings->fontSize(QWebSettings::DefaultFixedFontSize);
          QFont fixedFont = QFont(fixedFontFamily, fixedFontSize);
          fixedFont = qvariant_cast<QFont>(settings.value(QLatin1String("fixedFont"), fixedFont));
          defaultSettings->setFontFamily(QWebSettings::FixedFont, fixedFont.family());
          defaultSettings->setFontSize(QWebSettings::DefaultFixedFontSize, fixedFont.pointSize());

          defaultSettings->setAttribute(QWebSettings::JavascriptEnabled, settings.value(QLatin1String("enableJavascript"), true).toBool());
          defaultSettings->setAttribute(QWebSettings::PluginsEnabled, settings.value(QLatin1String("enablePlugins"), true).toBool());

          QUrl url = settings.value(QLatin1String("userStyleSheet")).toUrl();
          defaultSettings->setUserStyleSheetUrl(url);

          defaultSettings->setAttribute(QWebSettings::DnsPrefetchEnabled, true);

          settings.endGroup();
      }

      QList<BrowserMainWindow*> BrowserApplication::mainWindows()
      {
          clean();
          QList<BrowserMainWindow*> list;
          for (int i = 0; i < m_mainWindows.count(); ++i)
              list.append(m_mainWindows.at(i));
          return list;
      }

      void BrowserApplication::clean()
      {
          // cleanup any deleted main windows first
          for (int i = m_mainWindows.count() - 1; i >= 0; --i)
              if (m_mainWindows.at(i).isNull())
                  m_mainWindows.removeAt(i);
      }

      void BrowserApplication::saveSession()
      {
          QWebSettings *globalSettings = QWebSettings::globalSettings();
          if (globalSettings->testAttribute(QWebSettings::PrivateBrowsingEnabled))
              return;

          clean();

          QSettings settings;
          settings.beginGroup(QLatin1String("sessions"));

          QByteArray data;
          QBuffer buffer(&data);
          QDataStream stream(&buffer);
          buffer.open(QIODevice::ReadWrite);

          stream << m_mainWindows.count();
          for (int i = 0; i < m_mainWindows.count(); ++i)
              stream << m_mainWindows.at(i)->saveState();
          settings.setValue(QLatin1String("lastSession"), data);
          settings.endGroup();
      }

      bool BrowserApplication::canRestoreSession() const
      {
          return !m_lastSession.isEmpty();
      }

      void BrowserApplication::restoreLastSession()
      {
          QList<QByteArray> windows;
          QBuffer buffer(&m_lastSession);
          QDataStream stream(&buffer);
          buffer.open(QIODevice::ReadOnly);
          int windowCount;
          stream >> windowCount;
          for (int i = 0; i < windowCount; ++i) {
              QByteArray windowState;
              stream >> windowState;
              windows.append(windowState);
          }
          for (int i = 0; i < windows.count(); ++i) {
              BrowserMainWindow *newWindow = 0;
              if (m_mainWindows.count() == 1
                  && mainWindow()->tabWidget()->count() == 1
                  && mainWindow()->currentTab()->url() == QUrl()) {
                  newWindow = mainWindow();
              } else {
                  newWindow = newMainWindow();
              }
              newWindow->restoreState(windows.at(i));
          }
      }

      bool BrowserApplication::isTheOnlyBrowser() const
      {
          return (m_localServer != 0);
      }

      bool BrowserApplication::isCorrectlyInitialized() const
      {
          return m_correctlyInitialized;
      }

      void BrowserApplication::installTranslator(const QString &name)
      {
          QTranslator *translator = new QTranslator(this);
          translator->load(name, QLibraryInfo::location(QLibraryInfo::TranslationsPath));
          QApplication::installTranslator(translator);
      }

      #if defined(Q_OS_OSX)
      bool BrowserApplication::event(QEvent* event)
      {
          switch (event->type()) {
          case QEvent::ApplicationActivate: {
              clean();
              if (!m_mainWindows.isEmpty()) {
                  BrowserMainWindow *mw = mainWindow();
                  if (mw && !mw->isMinimized()) {
                      mainWindow()->show();
                  }
                  return true;
              }
          }
          case QEvent::FileOpen:
              if (!m_mainWindows.isEmpty()) {
                  mainWindow()->loadPage(static_cast<QFileOpenEvent *>(event)->file());
                  return true;
              }
          default:
              break;
          }
          return QApplication::event(event);
      }
      #endif

      void BrowserApplication::openUrl(const QUrl &url)
      {
          mainWindow()->loadPage(url.toString());
      }

      BrowserMainWindow *BrowserApplication::newMainWindow()
      {
          BrowserMainWindow *browser = new BrowserMainWindow();
          m_mainWindows.prepend(browser);
          browser->show();
          return browser;
      }

      BrowserMainWindow *BrowserApplication::mainWindow()
      {
          clean();
          if (m_mainWindows.isEmpty())
              newMainWindow();
          return m_mainWindows[0];
      }

      void BrowserApplication::newLocalSocketConnection()
      {
          QLocalSocket *socket = m_localServer->nextPendingConnection();
          if (!socket)
              return;
          socket->waitForReadyRead(1000);
          QTextStream stream(socket);
          QString url;
          stream >> url;
          if (!url.isEmpty()) {
              QSettings settings;
              settings.beginGroup(QLatin1String("general"));
              int openLinksIn = settings.value(QLatin1String("openLinksIn"), 0).toInt();
              settings.endGroup();
              if (openLinksIn == 1)
                  newMainWindow();
              else
                  mainWindow()->tabWidget()->newTab();
              openUrl(url);
          }
          delete socket;
          mainWindow()->raise();
          mainWindow()->activateWindow();
      }

      CookieJar *BrowserApplication::cookieJar()
      {
          return (CookieJar*)networkAccessManager()->cookieJar();
      }

      DownloadManager *BrowserApplication::downloadManager()
      {
          if (!s_downloadManager) {
              s_downloadManager = new DownloadManager();
          }
          return s_downloadManager;
      }

      NetworkAccessManager *BrowserApplication::networkAccessManager()
      {
          if (!s_networkAccessManager) {
              s_networkAccessManager = new NetworkAccessManager();
              s_networkAccessManager->setCookieJar(new CookieJar);
          }
          return s_networkAccessManager;
      }

      HistoryManager *BrowserApplication::historyManager()
      {
          if (!s_historyManager) {
              s_historyManager = new HistoryManager();
              QWebHistoryInterface::setDefaultInterface(s_historyManager);
          }
          return s_historyManager;
      }

      BookmarksManager *BrowserApplication::bookmarksManager()
      {
          if (!s_bookmarksManager) {
              s_bookmarksManager = new BookmarksManager;
          }
          return s_bookmarksManager;
      }

      QIcon BrowserApplication::icon(const QUrl &url) const
      {
          QIcon icon = QWebSettings::iconForUrl(url);
          if (!icon.isNull())
              return icon.pixmap(16, 16);
          if (m_defaultIcon.isNull())
              m_defaultIcon = QIcon(QLatin1String(":defaulticon.png"));
          return m_defaultIcon.pixmap(16, 16);
      }