Qt 5.7 | Qt WebEngine | WebEngine Widgets Simple Browser Example | browserwindow.cpp Example File

Qt 5.7.1 Reference Documentation

# browserwindow.cpp Example File

webenginewidgets/simplebrowser/browserwindow.cpp

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      #include "browser.h"
      #include "browserwindow.h"
      #include "tabwidget.h"
      #include "urllineedit.h"
      #include "webview.h"
      #include <QApplication>
      #include <QCloseEvent>
      #include <QDesktopWidget>
      #include <QFileDialog>
      #include <QMenuBar>
      #include <QMessageBox>
      #include <QProgressBar>
      #include <QStatusBar>
      #include <QToolBar>
      #include <QVBoxLayout>

      BrowserWindow::BrowserWindow(QWidget *parent, Qt::WindowFlags flags)
          : QMainWindow(parent, flags)
          , m_tabWidget(new TabWidget(this))
          , m_progressBar(new QProgressBar(this))
          , m_historyBackAction(nullptr)
          , m_historyForwardAction(nullptr)
          , m_stopAction(nullptr)
          , m_reloadAction(nullptr)
          , m_stopReloadAction(nullptr)
          , m_urlLineEdit(new UrlLineEdit(this))
      {
          setToolButtonStyle(Qt::ToolButtonFollowStyle);
          setAttribute(Qt::WA_DeleteOnClose, true);

          QToolBar *toolbar = createToolBar();
          addToolBar(toolbar);
          menuBar()->addMenu(createFileMenu(m_tabWidget));
          menuBar()->addMenu(createViewMenu(toolbar));
          menuBar()->addMenu(createWindowMenu(m_tabWidget));
          menuBar()->addMenu(createHelpMenu());

          QWidget *centralWidget = new QWidget(this);
          QVBoxLayout *layout = new QVBoxLayout;
          layout->setSpacing(0);
          layout->setMargin(0);
          addToolBarBreak();

          m_progressBar->setMaximumHeight(1);
          m_progressBar->setTextVisible(false);
          m_progressBar->setStyleSheet(QStringLiteral("QProgressBar {border: 0px } QProgressBar::chunk { background-color: red; }"));

          layout->addWidget(m_progressBar);
          layout->addWidget(m_tabWidget);
          centralWidget->setLayout(layout);
          setCentralWidget(centralWidget);

          connect(m_tabWidget, &TabWidget::titleChanged, this, &BrowserWindow::handleWebViewTitleChanged);
          connect(m_tabWidget, &TabWidget::linkHovered, [this](const QString& url) {
              statusBar()->showMessage(url);
          });
          connect(m_tabWidget, &TabWidget::loadProgress, this, &BrowserWindow::handleWebViewLoadProgress);
          connect(m_tabWidget, &TabWidget::urlChanged, this, &BrowserWindow::handleWebViewUrlChanged);
          connect(m_tabWidget, &TabWidget::iconChanged, this, &BrowserWindow::handleWebViewIconChanged);
          connect(m_tabWidget, &TabWidget::webActionEnabledChanged, this, &BrowserWindow::handleWebActionEnabledChanged);
          connect(m_urlLineEdit, &QLineEdit::returnPressed, this, [this]() {
              m_urlLineEdit->setFavIcon(QIcon(QStringLiteral(":defaulticon.png")));
              loadPage(m_urlLineEdit->url());
          });

          m_urlLineEdit->setFavIcon(QIcon(QStringLiteral(":defaulticon.png")));

          handleWebViewTitleChanged(tr("Qt Simple Browser"));
          m_tabWidget->createTab();
      }

      BrowserWindow::~BrowserWindow()
      {
      }

      QSize BrowserWindow::sizeHint() const
      {
          QRect desktopRect = QApplication::desktop()->screenGeometry();
          QSize size = desktopRect.size() * qreal(0.9);
          return size;
      }

      QMenu *BrowserWindow::createFileMenu(TabWidget *tabWidget)
      {
          QMenu *fileMenu = new QMenu(tr("&File"));
          fileMenu->addAction(tr("&New Window"), this, &BrowserWindow::handleNewWindowTriggered, QKeySequence::New);

          QAction *newTabAction = new QAction(QIcon(QLatin1String(":addtab.png")), tr("New &Tab"), this);
          newTabAction->setShortcuts(QKeySequence::AddTab);
          newTabAction->setIconVisibleInMenu(false);
          connect(newTabAction, &QAction::triggered, tabWidget, &TabWidget::createTab);
          fileMenu->addAction(newTabAction);

          fileMenu->addAction(tr("&Open File..."), this, &BrowserWindow::handleFileOpenTriggered, QKeySequence::Open);
          fileMenu->addSeparator();

          QAction *closeTabAction = new QAction(QIcon(QLatin1String(":closetab.png")), tr("&Close Tab"), this);
          closeTabAction->setShortcuts(QKeySequence::Close);
          closeTabAction->setIconVisibleInMenu(false);
          connect(closeTabAction, &QAction::triggered, [tabWidget]() {
              tabWidget->closeTab(tabWidget->currentIndex());
          });
          fileMenu->addAction(closeTabAction);

          QAction *closeAction = new QAction(tr("&Quit"),this);
          closeAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_Q));
          connect(closeAction, &QAction::triggered, this, &QWidget::close);
          fileMenu->addAction(closeAction);

          connect(fileMenu, &QMenu::aboutToShow, [closeAction]() {
              if (Browser::instance().windows().count() == 1)
                  closeAction->setText(tr("&Quit"));
              else
                  closeAction->setText(tr("&Close Window"));
          });
          return fileMenu;
      }

      QMenu *BrowserWindow::createViewMenu(QToolBar *toolbar)
      {
          QMenu *viewMenu = new QMenu(tr("&View"));
          m_stopAction = viewMenu->addAction(tr("&Stop"));
          QList<QKeySequence> shortcuts;
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_Period));
          shortcuts.append(Qt::Key_Escape);
          m_stopAction->setShortcuts(shortcuts);
          connect(m_stopAction, &QAction::triggered, [this]() {
              m_tabWidget->triggerWebPageAction(QWebEnginePage::Stop);
          });

          m_reloadAction = viewMenu->addAction(tr("Reload Page"));
          m_reloadAction->setShortcuts(QKeySequence::Refresh);
          connect(m_reloadAction, &QAction::triggered, [this]() {
              m_tabWidget->triggerWebPageAction(QWebEnginePage::Reload);
          });

          QAction *zoomIn = viewMenu->addAction(tr("Zoom &In"));
          zoomIn->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_Plus));
          connect(zoomIn, &QAction::triggered, [this]() {
              if (currentTab())
                  currentTab()->setZoomFactor(currentTab()->zoomFactor() + 0.1);
          });

          QAction *zoomOut = viewMenu->addAction(tr("Zoom &Out"));
          zoomOut->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_Minus));
          connect(zoomOut, &QAction::triggered, [this]() {
              if (currentTab())
                  currentTab()->setZoomFactor(currentTab()->zoomFactor() - 0.1);
          });

          QAction *resetZoom = viewMenu->addAction(tr("Reset &Zoom"));
          resetZoom->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_0));
          connect(resetZoom, &QAction::triggered, [this]() {
              if (currentTab())
                  currentTab()->setZoomFactor(1.0);
          });

          viewMenu->addSeparator();
          QAction *viewToolbarAction = new QAction(tr("Hide Toolbar"),this);
          viewToolbarAction->setShortcut(tr("Ctrl+|"));
          connect(viewToolbarAction, &QAction::triggered, [toolbar,viewToolbarAction]() {
              if (toolbar->isVisible()) {
                  viewToolbarAction->setText(tr("Show Toolbar"));
                  toolbar->close();
              } else {
                  viewToolbarAction->setText(tr("Hide Toolbar"));
                  toolbar->show();
              }
          });
          viewMenu->addAction(viewToolbarAction);

          QAction *viewStatusbarAction = new QAction(tr("Hide Status Bar"), this);
          viewStatusbarAction->setShortcut(tr("Ctrl+/"));
          connect(viewStatusbarAction, &QAction::triggered, [this, viewStatusbarAction]() {
              if (statusBar()->isVisible()) {
                  viewStatusbarAction->setText(tr("Show Status Bar"));
                  statusBar()->close();
              } else {
                  viewStatusbarAction->setText(tr("Hide Status Bar"));
                  statusBar()->show();
              }
          });
          viewMenu->addAction(viewStatusbarAction);
          return viewMenu;
      }

      QMenu *BrowserWindow::createWindowMenu(TabWidget *tabWidget)
      {
          QMenu *menu = new QMenu(tr("&Window"));

          QAction *nextTabAction = new QAction(tr("Show Next Tab"), this);
          QList<QKeySequence> shortcuts;
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_BraceRight));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_PageDown));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_BracketRight));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_Less));
          nextTabAction->setShortcuts(shortcuts);
          connect(nextTabAction, &QAction::triggered, tabWidget, &TabWidget::nextTab);

          QAction *previousTabAction = new QAction(tr("Show Previous Tab"), this);
          shortcuts.clear();
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_BraceLeft));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_PageUp));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_BracketLeft));
          shortcuts.append(QKeySequence(Qt::CTRL | Qt::Key_Greater));
          previousTabAction->setShortcuts(shortcuts);
          connect(previousTabAction, &QAction::triggered, tabWidget, &TabWidget::previousTab);

          connect(menu, &QMenu::aboutToShow, [this, menu, nextTabAction, previousTabAction]() {
              menu->clear();
              menu->addAction(nextTabAction);
              menu->addAction(previousTabAction);
              menu->addSeparator();

              QVector<BrowserWindow*> windows = Browser::instance().windows();
              int index(-1);
              for (auto window : windows) {
                  QAction *action = menu->addAction(window->windowTitle(), this, &BrowserWindow::handleShowWindowTriggered);
                  action->setData(++index);
                  action->setCheckable(true);
                  if (window == this)
                      action->setChecked(true);
              }
          });
          return menu;
      }

      QMenu *BrowserWindow::createHelpMenu()
      {
          QMenu *helpMenu = new QMenu(tr("&Help"));
          helpMenu->addAction(tr("About &Qt"), qApp, QApplication::aboutQt);
          return helpMenu;
      }

      QToolBar *BrowserWindow::createToolBar()
      {
          QToolBar *navigationBar = new QToolBar(tr("Navigation"));
          navigationBar->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
          navigationBar->toggleViewAction()->setEnabled(false);

          m_historyBackAction = new QAction(this);
          QList<QKeySequence> backShortcuts = QKeySequence::keyBindings(QKeySequence::Back);
          for (auto it = backShortcuts.begin(); it != backShortcuts.end();) {
              // Chromium already handles navigate on backspace when appropriate.
              if ((*it)[0] == Qt::Key_Backspace)
                  it = backShortcuts.erase(it);
              else
                  ++it;
          }
          // For some reason Qt doesn't bind the dedicated Back key to Back.
          backShortcuts.append(QKeySequence(Qt::Key_Back));
          m_historyBackAction->setShortcuts(backShortcuts);
          m_historyBackAction->setIconVisibleInMenu(false);
          m_historyBackAction->setIcon(QIcon(QStringLiteral(":go-previous.png")));
          connect(m_historyBackAction, &QAction::triggered, [this]() {
              m_tabWidget->triggerWebPageAction(QWebEnginePage::Back);
          });
          navigationBar->addAction(m_historyBackAction);

          m_historyForwardAction = new QAction(this);
          QList<QKeySequence> fwdShortcuts = QKeySequence::keyBindings(QKeySequence::Forward);
          for (auto it = fwdShortcuts.begin(); it != fwdShortcuts.end();) {
              if (((*it)[0] & Qt::Key_unknown) == Qt::Key_Backspace)
                  it = fwdShortcuts.erase(it);
              else
                  ++it;
          }
          fwdShortcuts.append(QKeySequence(Qt::Key_Forward));
          m_historyForwardAction->setShortcuts(fwdShortcuts);
          m_historyForwardAction->setIconVisibleInMenu(false);
          m_historyForwardAction->setIcon(QIcon(QStringLiteral(":go-next.png")));
          connect(m_historyForwardAction, &QAction::triggered, [this]() {
              m_tabWidget->triggerWebPageAction(QWebEnginePage::Forward);
          });
          navigationBar->addAction(m_historyForwardAction);

          m_stopReloadAction = new QAction(this);
          connect(m_stopReloadAction, &QAction::triggered, [this]() {
              m_tabWidget->triggerWebPageAction(QWebEnginePage::WebAction(m_stopReloadAction->data().toInt()));
          });
          navigationBar->addAction(m_stopReloadAction);
          navigationBar->addWidget(m_urlLineEdit);
          int size = m_urlLineEdit->sizeHint().height();
          navigationBar->setIconSize(QSize(size, size));
          return navigationBar;
      }

      void BrowserWindow::handleWebViewIconChanged(const QIcon &icon)
      {
          m_urlLineEdit->setFavIcon(icon);
      }

      void BrowserWindow::handleWebViewUrlChanged(const QUrl &url)
      {
          m_urlLineEdit->setUrl(url);
          if (url.isEmpty())
              m_urlLineEdit->setFocus();
      }

      void BrowserWindow::handleWebActionEnabledChanged(QWebEnginePage::WebAction action, bool enabled)
      {
          switch (action) {
          case QWebEnginePage::Back:
              m_historyBackAction->setEnabled(enabled);
              break;
          case QWebEnginePage::Forward:
              m_historyForwardAction->setEnabled(enabled);
              break;
          case QWebEnginePage::Reload:
              m_reloadAction->setEnabled(enabled);
              break;
          case QWebEnginePage::Stop:
              m_stopAction->setEnabled(enabled);
              break;
          default:
              qWarning("Unhandled webActionChanged singal");
          }
      }

      void BrowserWindow::handleWebViewTitleChanged(const QString &title)
      {
          if (title.isEmpty())
              setWindowTitle(tr("Qt Simple Browser"));
          else
              setWindowTitle(tr("%1 - Qt Simple Browser").arg(title));
      }

      void BrowserWindow::handleNewWindowTriggered()
      {
          BrowserWindow *window = new BrowserWindow();
          Browser::instance().addWindow(window);
          window->loadHomePage();
      }

      void BrowserWindow::handleFileOpenTriggered()
      {
          QString file = QFileDialog::getOpenFileName(this, tr("Open Web Resource"), QString(),
                                                      tr("Web Resources (*.html *.htm *.svg *.png *.gif *.svgz);;All files (*.*)"));
          if (file.isEmpty())
              return;
          loadPage(file);
      }

      void BrowserWindow::closeEvent(QCloseEvent *event)
      {
          if (m_tabWidget->count() > 1) {
              int ret = QMessageBox::warning(this, tr("Confirm close"),
                                             tr("Are you sure you want to close the window ?\n"
                                                "There are %1 tabs open.").arg(m_tabWidget->count()),
                                             QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
              if (ret == QMessageBox::No) {
                  event->ignore();
                  return;
              }
          }
          event->accept();
          deleteLater();
      }

      void BrowserWindow::loadHomePage()
      {
          loadPage(QStringLiteral("http://www.qt.io"));
      }

      void BrowserWindow::loadPage(const QString &page)
      {
          loadPage(QUrl::fromUserInput(page));
      }

      void BrowserWindow::loadPage(const QUrl &url)
      {
          if (url.isValid()) {
              m_urlLineEdit->setUrl(url);
              m_tabWidget->setUrl(url);
          }
      }

      TabWidget *BrowserWindow::tabWidget() const
      {
          return m_tabWidget;
      }

      WebView *BrowserWindow::currentTab() const
      {
          return m_tabWidget->currentWebView();
      }

      void BrowserWindow::handleWebViewLoadProgress(int progress)
      {
          static QIcon stopIcon(QStringLiteral(":process-stop.png"));
          static QIcon reloadIcon(QStringLiteral(":view-refresh.png"));

          if (progress < 100 && progress > 0) {
              m_stopReloadAction->setData(QWebEnginePage::Stop);
              m_stopReloadAction->setIcon(stopIcon);
              m_stopReloadAction->setToolTip(tr("Stop loading the current page"));
          } else {
              m_stopReloadAction->setData(QWebEnginePage::Reload);
              m_stopReloadAction->setIcon(reloadIcon);
              m_stopReloadAction->setToolTip(tr("Reload the current page"));
          }
          m_progressBar->setValue(progress < 100 ? progress : 0);
      }

      void BrowserWindow::handleShowWindowTriggered()
      {
          if (QAction *action = qobject_cast<QAction*>(sender())) {
              int offset = action->data().toInt();
              QVector<BrowserWindow*> windows = Browser::instance().windows();
              windows.at(offset)->activateWindow();
              windows.at(offset)->currentTab()->setFocus();
          }
      }