mainwindow.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** 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 Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** 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,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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);
 }