mainwindow.cpp Example File

webenginewidgets/contentmanipulation/mainwindow.cpp
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 #include <QtWidgets>
 #include <QtWebEngineWidgets>
 #include "mainwindow.h"

 MainWindow::MainWindow(const QUrl& url)
 {
     setAttribute(Qt::WA_DeleteOnClose, true);
     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();

     view = new QWebEngineView(this);
     view->load(url);
     connect(view, &QWebEngineView::loadFinished, this, &MainWindow::adjustLocation);
     connect(view, &QWebEngineView::titleChanged, this, &MainWindow::adjustTitle);
     connect(view, &QWebEngineView::loadProgress, this, &MainWindow::setProgress);
     connect(view, &QWebEngineView::loadFinished, this, &MainWindow::finishLoading);

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

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

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

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

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

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

     setCentralWidget(view);
 }

 void MainWindow::viewSource()
 {
     QTextEdit *textEdit = new QTextEdit(nullptr);
     textEdit->setAttribute(Qt::WA_DeleteOnClose);
     textEdit->adjustSize();
     textEdit->move(this->geometry().center() - textEdit->rect().center());
     textEdit->show();

     view->page()->toHtml([textEdit](const QString &html){
         textEdit->setPlainText(html);
     });
 }

 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(QStringLiteral("%1 (%2%)").arg(view->title()).arg(progress));
 }

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

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

     rotateImages(rotateAction->isChecked());
 }

 void MainWindow::highlightAllLinks()
 {
     QString code = QStringLiteral("qt.jQuery('a').each( function () { qt.jQuery(this).css('background-color', 'yellow') } )");
     view->page()->runJavaScript(code);
 }

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

     if (invert)
         code = QStringLiteral("qt.jQuery('img').each( function () { qt.jQuery(this).css('transition', 'transform 2s'); qt.jQuery(this).css('transform', 'rotate(180deg)') } )");
     else
         code = QStringLiteral("qt.jQuery('img').each( function () { qt.jQuery(this).css('transition', 'transform 2s'); qt.jQuery(this).css('transform', 'rotate(0deg)') } )");
     view->page()->runJavaScript(code);
 }

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

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

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

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