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

Qt 5.7.1 Reference Documentation

# tabwidget.cpp Example File

webenginewidgets/simplebrowser/tabwidget.cpp

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      ** This file is part of the examples of the Qt Toolkit.
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      #include "tabwidget.h"
      #include "webpage.h"
      #include "webview.h"
      #include <QMenu>
      #include <QTabBar>
      #include <QWebEngineProfile>

      TabWidget::TabWidget(QWidget *parent)
          : QTabWidget(parent)
      {
          QTabBar *tabBar = this->tabBar();
          tabBar->setTabsClosable(true);
          tabBar->setSelectionBehaviorOnRemove(QTabBar::SelectPreviousTab);
          tabBar->setMovable(true);
          tabBar->setContextMenuPolicy(Qt::CustomContextMenu);
          connect(tabBar, &QTabBar::customContextMenuRequested, this, &TabWidget::handleContextMenuRequested);
          connect(tabBar, &QTabBar::tabCloseRequested, this, &TabWidget::closeTab);
          connect(tabBar, &QTabBar::tabBarDoubleClicked, [this](int index) {
              if (index != -1)
                  return;
              createTab();
          });

          setDocumentMode(true);
          setElideMode(Qt::ElideRight);

          connect(this, &QTabWidget::currentChanged, this, &TabWidget::handleCurrentChanged);
      }

      TabWidget::~TabWidget()
      {
      }

      void TabWidget::handleCurrentChanged(int index)
      {
          if (index != -1) {
              WebView *view = webView(index);
              if (!view->url().isEmpty())
                  view->setFocus();
              emit titleChanged(view->title());
              emit loadProgress(view->loadProgress());
              emit urlChanged(view->url());
              QIcon pageIcon = view->page()->icon();
              if (!pageIcon.isNull())
                  emit iconChanged(pageIcon);
              else
                  emit iconChanged(QIcon(QStringLiteral(":defaulticon.png")));
              emit webActionEnabledChanged(QWebEnginePage::Back, view->isWebActionEnabled(QWebEnginePage::Back));
              emit webActionEnabledChanged(QWebEnginePage::Forward, view->isWebActionEnabled(QWebEnginePage::Forward));
              emit webActionEnabledChanged(QWebEnginePage::Stop, view->isWebActionEnabled(QWebEnginePage::Stop));
              emit webActionEnabledChanged(QWebEnginePage::Reload,view->isWebActionEnabled(QWebEnginePage::Reload));
          } else {
              emit titleChanged(QString());
              emit loadProgress(0);
              emit urlChanged(QUrl());
              emit iconChanged(QIcon(QStringLiteral(":defaulticon.png")));
              emit webActionEnabledChanged(QWebEnginePage::Back, false);
              emit webActionEnabledChanged(QWebEnginePage::Forward, false);
              emit webActionEnabledChanged(QWebEnginePage::Stop, false);
              emit webActionEnabledChanged(QWebEnginePage::Reload, true);
          }
      }

      void TabWidget::handleContextMenuRequested(const QPoint &pos)
      {
          QMenu menu;
          menu.addAction(tr("New &Tab"), this, &TabWidget::createTab, QKeySequence::AddTab);
          int index = tabBar()->tabAt(pos);
          if (index != -1) {
              QAction *action = menu.addAction(tr("Clone Tab"));
              connect(action, &QAction::triggered, this, [this,index]() {
                  cloneTab(index);
              });
              menu.addSeparator();
              action = menu.addAction(tr("&Close Tab"));
              action->setShortcut(QKeySequence::Close);
              connect(action, &QAction::triggered, this, [this,index]() {
                  closeTab(index);
              });
              action = menu.addAction(tr("Close &Other Tabs"));
              connect(action, &QAction::triggered, this, [this,index]() {
                  closeOtherTabs(index);
              });
              menu.addSeparator();
              action = menu.addAction(tr("Reload Tab"));
              action->setShortcut(QKeySequence::Refresh);
              connect(action, &QAction::triggered, this, [this,index]() {
                  reloadTab(index);
              });
          } else {
              menu.addSeparator();
          }
          menu.addAction(tr("Reload All Tabs"), this, &TabWidget::reloadAllTabs);
          menu.exec(QCursor::pos());
      }

      WebView *TabWidget::currentWebView() const
      {
          return webView(currentIndex());
      }

      WebView *TabWidget::webView(int index) const
      {
          return qobject_cast<WebView*>(widget(index));
      }

      void TabWidget::setupView(WebView *webView)
      {
          QWebEnginePage *webPage = webView->page();

          connect(webView, &QWebEngineView::titleChanged, [this, webView](const QString &title) {
              int index = indexOf(webView);
              if (index != -1)
                  setTabText(index, title);
              if (currentIndex() == index)
                  emit titleChanged(title);
          });
          connect(webView, &QWebEngineView::urlChanged, [this, webView](const QUrl &url) {
              int index = indexOf(webView);
              if (index != -1)
                  tabBar()->setTabData(index, url);
              if (currentIndex() == index)
                  emit urlChanged(url);
          });
          connect(webView, &QWebEngineView::loadProgress, [this, webView](int progress) {
              if (currentIndex() == indexOf(webView))
                  emit loadProgress(progress);
          });
          connect(webPage, &QWebEnginePage::linkHovered, [this, webView](const QString &url) {
              if (currentIndex() == indexOf(webView))
                  emit linkHovered(url);
          });
          connect(webPage, &WebPage::iconChanged, [this, webView](const QIcon &icon) {
              int index = indexOf(webView);
              QIcon ico = icon.isNull() ? QIcon(QStringLiteral(":defaulticon.png")) : icon;

              if (index != -1)
                  setTabIcon(index, ico);
              if (currentIndex() == index)
                  emit iconChanged(ico);
          });
          connect(webView, &WebView::webActionEnabledChanged, [this, webView](QWebEnginePage::WebAction action, bool enabled) {
              if (currentIndex() ==  indexOf(webView))
                  emit webActionEnabledChanged(action,enabled);
          });
          connect(webView, &QWebEngineView::loadStarted, [this, webView]() {
              int index = indexOf(webView);
              if (index != -1) {
                  QIcon icon(QLatin1String(":view-refresh.png"));
                  setTabIcon(index, icon);
              }
          });
          connect(webPage, &QWebEnginePage::windowCloseRequested, [this, webView]() {
              int index = indexOf(webView);
              if (index >= 0)
                  closeTab(index);
          });
      }

      WebView *TabWidget::createTab(bool makeCurrent)
      {
          WebView *webView = new WebView;
          WebPage *webPage = new WebPage(QWebEngineProfile::defaultProfile(), webView);
          webView->setPage(webPage);
          setupView(webView);
          addTab(webView, tr("(Untitled)"));
          if (makeCurrent)
              setCurrentWidget(webView);
          return webView;
      }

      void TabWidget::reloadAllTabs()
      {
          for (int i = 0; i < count(); ++i)
              webView(i)->reload();
      }

      void TabWidget::closeOtherTabs(int index)
      {
          for (int i = count() - 1; i > index; --i)
              closeTab(i);
          for (int i = index - 1; i >= 0; --i)
              closeTab(i);
      }

      void TabWidget::closeTab(int index)
      {
          if (WebView *view = webView(index)) {
              bool hasFocus = view->hasFocus();
              removeTab(index);
              if (hasFocus && count() > 0)
                  currentWebView()->setFocus();
              if (count() == 0)
                  createTab();
              view->deleteLater();
          }
      }

      void TabWidget::cloneTab(int index)
      {
          if (WebView *view = webView(index)) {
              WebView *tab = createTab(false);
              tab->setUrl(view->url());
          }
      }

      void TabWidget::setUrl(const QUrl &url)
      {
          if (WebView *view = currentWebView()) {
              view->setUrl(url);
              view->setFocus();
          }
      }

      void TabWidget::triggerWebPageAction(QWebEnginePage::WebAction action)
      {
          if (WebView *webView = currentWebView()) {
              webView->triggerPageAction(action);
              webView->setFocus();
          }
      }

      void TabWidget::nextTab()
      {
          int next = currentIndex() + 1;
          if (next == count())
              next = 0;
          setCurrentIndex(next);
      }

      void TabWidget::previousTab()
      {
          int next = currentIndex() - 1;
          if (next < 0)
              next = count() - 1;
          setCurrentIndex(next);
      }

      void TabWidget::reloadTab(int index)
      {
          if (WebView *view = webView(index))
              view->reload();
      }