Qt 4.8: mainwindow.cpp Example File (webkit/fancybrowser/mainwindow.cpp)

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# mainwindow.cpp Example File

webkit/fancybrowser/mainwindow.cpp

     /****************************************************************************
     **
     ** 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:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     #include <QtGui>
     #include <QtNetwork>
     #include <QtWebKit>
     #include "mainwindow.h"

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

         QFile file;
         file.setFileName(":/jquery.min.js");
         file.open(QIODevice::ReadOnly);
         jQuery = file.readAll();
         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(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()
     {
         QString code = "$('a').each( function () { $(this).css('background-color', 'yellow') } )";
         view->page()->mainFrame()->evaluateJavaScript(code);
     }

     void MainWindow::rotateImages(bool invert)
     {
         QString code;
         if (invert)
             code = "$('img').each( function () { $(this).css('-webkit-transition', '-webkit-transform 2s'); $(this).css('-webkit-transform', 'rotate(180deg)') } )";
         else
             code = "$('img').each( function () { $(this).css('-webkit-transition', '-webkit-transform 2s'); $(this).css('-webkit-transform', 'rotate(0deg)') } )";
         view->page()->mainFrame()->evaluateJavaScript(code);
     }

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

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

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

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