mainwindow.cpp Example File | Qt WebKit Examples 5.9

Qt 5.9 | Qt WebKit Examples | Fancy Browser Example | mainwindow.cpp Example File

Qt 5.9.2 Reference Documentation

# mainwindow.cpp Example File

webkitwidgets/fancybrowser/mainwindow.cpp

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
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      **     from this software without specific prior written permission.
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      #include <QtWidgets>
      #include <QtNetwork>
      #include <QtWebKitWidgets>
      #include "mainwindow.h"

      MainWindow::MainWindow(const QUrl& url)
      {
          progress = 0;

          QFile file;
          file.setFileName(":/jquery.min.js");
          file.open(QIODevice::ReadOnly);
          jQuery = file.readAll();
          jQuery.append("\nvar qt = { 'jQuery': jQuery.noConflict(true) };");
          file.close();

          QNetworkProxyFactory::setUseSystemConfiguration(true);

          view = new QWebView(this);
          view->load(url);
          connect(view, SIGNAL(loadFinished(bool)), SLOT(adjustLocation()));
          connect(view, SIGNAL(titleChanged(QString)), SLOT(adjustTitle()));
          connect(view, SIGNAL(loadProgress(int)), SLOT(setProgress(int)));
          connect(view, SIGNAL(loadFinished(bool)), SLOT(finishLoading(bool)));

          locationEdit = new QLineEdit(this);
          locationEdit->setSizePolicy(QSizePolicy::Expanding, locationEdit->sizePolicy().verticalPolicy());
          connect(locationEdit, SIGNAL(returnPressed()), SLOT(changeLocation()));

          QToolBar *toolBar = addToolBar(tr("Navigation"));
          toolBar->addAction(view->pageAction(QWebPage::Back));
          toolBar->addAction(view->pageAction(QWebPage::Forward));
          toolBar->addAction(view->pageAction(QWebPage::Reload));
          toolBar->addAction(view->pageAction(QWebPage::Stop));
          toolBar->addWidget(locationEdit);

          QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
          QAction* viewSourceAction = new QAction("Page Source", this);
          connect(viewSourceAction, SIGNAL(triggered()), SLOT(viewSource()));
          viewMenu->addAction(viewSourceAction);

          QMenu *effectMenu = menuBar()->addMenu(tr("&Effect"));
          effectMenu->addAction("Highlight all links", this, SLOT(highlightAllLinks()));

          rotateAction = new QAction(this);
          rotateAction->setIcon(style()->standardIcon(QStyle::SP_FileDialogDetailedView));
          rotateAction->setCheckable(true);
          rotateAction->setText(tr("Turn images upside down"));
          connect(rotateAction, SIGNAL(toggled(bool)), this, SLOT(rotateImages(bool)));
          effectMenu->addAction(rotateAction);

          QMenu *toolsMenu = menuBar()->addMenu(tr("&Tools"));
          toolsMenu->addAction(tr("Remove GIF images"), this, SLOT(removeGifImages()));
          toolsMenu->addAction(tr("Remove all inline frames"), this, SLOT(removeInlineFrames()));
          toolsMenu->addAction(tr("Remove all object elements"), this, SLOT(removeObjectElements()));
          toolsMenu->addAction(tr("Remove all embedded elements"), this, SLOT(removeEmbeddedElements()));

          setCentralWidget(view);
          setUnifiedTitleAndToolBarOnMac(true);
      }

      void MainWindow::viewSource()
      {
          QNetworkAccessManager* accessManager = view->page()->networkAccessManager();
          QNetworkRequest request(view->url());
          QNetworkReply* reply = accessManager->get(request);
          connect(reply, SIGNAL(finished()), this, SLOT(slotSourceDownloaded()));
      }

      void MainWindow::slotSourceDownloaded()
      {
          QNetworkReply* reply = qobject_cast<QNetworkReply*>(const_cast<QObject*>(sender()));
          QTextEdit* textEdit = new QTextEdit(NULL);
          textEdit->setAttribute(Qt::WA_DeleteOnClose);
          textEdit->show();
          textEdit->setPlainText(reply->readAll());
          reply->deleteLater();
      }

      void MainWindow::adjustLocation()
      {
          locationEdit->setText(view->url().toString());
      }

      void MainWindow::changeLocation()
      {
          QUrl url = QUrl::fromUserInput(locationEdit->text());
          view->load(url);
          view->setFocus();
      }

      void MainWindow::adjustTitle()
      {
          if (progress <= 0 || progress >= 100)
              setWindowTitle(view->title());
          else
              setWindowTitle(QString("%1 (%2%)").arg(view->title()).arg(progress));
      }

      void MainWindow::setProgress(int p)
      {
          progress = p;
          adjustTitle();
      }

      void MainWindow::finishLoading(bool)
      {
          progress = 100;
          adjustTitle();
          view->page()->mainFrame()->evaluateJavaScript(jQuery);

          rotateImages(rotateAction->isChecked());
      }

      void MainWindow::highlightAllLinks()
      {
          // We append '; undefined' after the jQuery call here to prevent a possible recursion loop and crash caused by
          // the way the elements returned by the each iterator elements reference each other, which causes problems upon
          // converting them to QVariants.
          QString code = "qt.jQuery('a').each( function () { qt.jQuery(this).css('background-color', 'yellow') } ); undefined";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }

      void MainWindow::rotateImages(bool invert)
      {
          QString code;

          // We append '; undefined' after each of the jQuery calls here to prevent a possible recursion loop and crash caused by
          // the way the elements returned by the each iterator elements reference each other, which causes problems upon
          // converting them to QVariants.
          if (invert)
              code = "qt.jQuery('img').each( function () { qt.jQuery(this).css('-webkit-transition', '-webkit-transform 2s'); qt.jQuery(this).css('-webkit-transform', 'rotate(180deg)') } ); undefined";
          else
              code = "qt.jQuery('img').each( function () { qt.jQuery(this).css('-webkit-transition', '-webkit-transform 2s'); qt.jQuery(this).css('-webkit-transform', 'rotate(0deg)') } ); undefined";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }

      void MainWindow::removeGifImages()
      {
          QString code = "qt.jQuery('[src*=gif]').remove()";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }

      void MainWindow::removeInlineFrames()
      {
          QString code = "qt.jQuery('iframe').remove()";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }

      void MainWindow::removeObjectElements()
      {
          QString code = "qt.jQuery('object').remove()";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }

      void MainWindow::removeEmbeddedElements()
      {
          QString code = "qt.jQuery('embed').remove()";
          view->page()->mainFrame()->evaluateJavaScript(code);
      }