webview.cpp Example File | Qt WebKit Examples 5.5

- Qt 5.5
- Qt WebKit Examples
- Tab Browser
- webview.cpp Example File
- Qt 5.5.1 Reference Documentation

# webview.cpp Example File

webkitwidgets/browser/webview.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and The Qt Company. For licensing terms
    ** and conditions see http://www.qt.io/terms-conditions. For further
    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** As a special exception, The Qt Company gives you certain additional
    ** rights. These rights are described in The Qt Company LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "browserapplication.h"
    #include "browsermainwindow.h"
    #include "cookiejar.h"
    #include "downloadmanager.h"
    #include "networkaccessmanager.h"
    #include "tabwidget.h"
    #include "webview.h"

    #include <QtGui/QClipboard>
    #include <QtWidgets/QMenu>
    #include <QtWidgets/QMessageBox>
    #include <QtGui/QMouseEvent>

    #include <QWebHitTestResult>

    #ifndef QT_NO_UITOOLS
    #include <QtUiTools/QUiLoader>
    #endif  //QT_NO_UITOOLS

    #include <QtCore/QDebug>
    #include <QtCore/QBuffer>

    WebPage::WebPage(QObject *parent)
        : QWebPage(parent)
        , m_keyboardModifiers(Qt::NoModifier)
        , m_pressedButtons(Qt::NoButton)
        , m_openInNewTab(false)
    {
        setNetworkAccessManager(BrowserApplication::networkAccessManager());
        connect(this, SIGNAL(unsupportedContent(QNetworkReply*)),
                this, SLOT(handleUnsupportedContent(QNetworkReply*)));
    }

    BrowserMainWindow *WebPage::mainWindow()
    {
        QObject *w = this->parent();
        while (w) {
            if (BrowserMainWindow *mw = qobject_cast<BrowserMainWindow*>(w))
                return mw;
            w = w->parent();
        }
        return BrowserApplication::instance()->mainWindow();
    }

    bool WebPage::acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type)
    {
        // ctrl open in new tab
        // ctrl-shift open in new tab and select
        // ctrl-alt open in new window
        if (type == QWebPage::NavigationTypeLinkClicked
            && (m_keyboardModifiers & Qt::ControlModifier
                || m_pressedButtons == Qt::MidButton)) {
            bool newWindow = (m_keyboardModifiers & Qt::AltModifier);
            WebView *webView;
            if (newWindow) {
                BrowserApplication::instance()->newMainWindow();
                BrowserMainWindow *newMainWindow = BrowserApplication::instance()->mainWindow();
                webView = newMainWindow->currentTab();
                newMainWindow->raise();
                newMainWindow->activateWindow();
                webView->setFocus();
            } else {
                bool selectNewTab = (m_keyboardModifiers & Qt::ShiftModifier);
                webView = mainWindow()->tabWidget()->newTab(selectNewTab);
            }
            webView->load(request);
            m_keyboardModifiers = Qt::NoModifier;
            m_pressedButtons = Qt::NoButton;
            return false;
        }
        if (frame == mainFrame()) {
            m_loadingUrl = request.url();
            emit loadingUrl(m_loadingUrl);
        }
        return QWebPage::acceptNavigationRequest(frame, request, type);
    }

    QWebPage *WebPage::createWindow(QWebPage::WebWindowType type)
    {
        Q_UNUSED(type);
        if (m_keyboardModifiers & Qt::ControlModifier || m_pressedButtons == Qt::MidButton)
            m_openInNewTab = true;
        if (m_openInNewTab) {
            m_openInNewTab = false;
            return mainWindow()->tabWidget()->newTab()->page();
        }
        BrowserApplication::instance()->newMainWindow();
        BrowserMainWindow *mainWindow = BrowserApplication::instance()->mainWindow();
        return mainWindow->currentTab()->page();
    }

    #if !defined(QT_NO_UITOOLS)
    QObject *WebPage::createPlugin(const QString &classId, const QUrl &url, const QStringList &paramNames, const QStringList &paramValues)
    {
        Q_UNUSED(url);
        Q_UNUSED(paramNames);
        Q_UNUSED(paramValues);
        QUiLoader loader;
        return loader.createWidget(classId, view());
    }
    #endif // !defined(QT_NO_UITOOLS)

    void WebPage::handleUnsupportedContent(QNetworkReply *reply)
    {
        QString errorString = reply->errorString();

        if (m_loadingUrl != reply->url()) {
            // sub resource of this page
            qWarning() << "Resource" << reply->url().toEncoded() << "has unknown Content-Type, will be ignored.";
            reply->deleteLater();
            return;
        }

        if (reply->error() == QNetworkReply::NoError && !reply->header(QNetworkRequest::ContentTypeHeader).isValid()) {
            errorString = "Unknown Content-Type";
        }

        QFile file(QLatin1String(":/notfound.html"));
        bool isOpened = file.open(QIODevice::ReadOnly);
        Q_ASSERT(isOpened);
        Q_UNUSED(isOpened)

        QString title = tr("Error loading page: %1").arg(reply->url().toString());
        QString html = QString(QLatin1String(file.readAll()))
                            .arg(title)
                            .arg(errorString)
                            .arg(reply->url().toString());

        QBuffer imageBuffer;
        imageBuffer.open(QBuffer::ReadWrite);
        QIcon icon = view()->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, view());
        QPixmap pixmap = icon.pixmap(QSize(32,32));
        if (pixmap.save(&imageBuffer, "PNG")) {
            html.replace(QLatin1String("IMAGE_BINARY_DATA_HERE"),
                         QString(QLatin1String(imageBuffer.buffer().toBase64())));
        }

        QList<QWebFrame*> frames;
        frames.append(mainFrame());
        while (!frames.isEmpty()) {
            QWebFrame *frame = frames.takeFirst();
            if (frame->url() == reply->url()) {
                frame->setHtml(html, reply->url());
                return;
            }
            QList<QWebFrame *> children = frame->childFrames();
            foreach(QWebFrame *frame, children)
                frames.append(frame);
        }
        if (m_loadingUrl == reply->url()) {
            mainFrame()->setHtml(html, reply->url());
        }
    }

    WebView::WebView(QWidget* parent)
        : QWebView(parent)
        , m_progress(0)
        , m_page(new WebPage(this))
    {
        setPage(m_page);
        connect(page(), SIGNAL(statusBarMessage(QString)),
                SLOT(setStatusBarText(QString)));
        connect(this, SIGNAL(loadProgress(int)),
                this, SLOT(setProgress(int)));
        connect(this, SIGNAL(loadFinished(bool)),
                this, SLOT(loadFinished()));
        connect(page(), SIGNAL(loadingUrl(QUrl)),
                this, SIGNAL(urlChanged(QUrl)));
        connect(page(), SIGNAL(downloadRequested(QNetworkRequest)),
                this, SLOT(downloadRequested(QNetworkRequest)));
        page()->setForwardUnsupportedContent(true);

    }

    void WebView::contextMenuEvent(QContextMenuEvent *event)
    {
        QWebHitTestResult r = page()->mainFrame()->hitTestContent(event->pos());
        if (!r.linkUrl().isEmpty()) {
            QMenu menu(this);
            menu.addAction(pageAction(QWebPage::OpenLinkInNewWindow));
            menu.addAction(tr("Open in New Tab"), this, SLOT(openLinkInNewTab()));
            menu.addSeparator();
            menu.addAction(pageAction(QWebPage::DownloadLinkToDisk));
            // Add link to bookmarks...
            menu.addSeparator();
            menu.addAction(pageAction(QWebPage::CopyLinkToClipboard));
            if (page()->settings()->testAttribute(QWebSettings::DeveloperExtrasEnabled))
                menu.addAction(pageAction(QWebPage::InspectElement));
            menu.exec(mapToGlobal(event->pos()));
            return;
        }
        QWebView::contextMenuEvent(event);
    }

    void WebView::wheelEvent(QWheelEvent *event)
    {
        if (QApplication::keyboardModifiers() & Qt::ControlModifier) {
            int numDegrees = event->delta() / 8;
            int numSteps = numDegrees / 15;
            setTextSizeMultiplier(textSizeMultiplier() + numSteps * 0.1);
            event->accept();
            return;
        }
        QWebView::wheelEvent(event);
    }

    void WebView::openLinkInNewTab()
    {
        m_page->m_openInNewTab = true;
        pageAction(QWebPage::OpenLinkInNewWindow)->trigger();
    }

    void WebView::setProgress(int progress)
    {
        m_progress = progress;
    }

    void WebView::loadFinished()
    {
        if (100 != m_progress) {
            qWarning() << "Received finished signal while progress is still:" << progress()
                       << "Url:" << url();
        }
        m_progress = 0;
    }

    void WebView::loadUrl(const QUrl &url)
    {
        m_initialUrl = url;
        load(url);
    }

    QString WebView::lastStatusBarText() const
    {
        return m_statusBarText;
    }

    QUrl WebView::url() const
    {
        QUrl url = QWebView::url();
        if (!url.isEmpty())
            return url;

        return m_initialUrl;
    }

    void WebView::mousePressEvent(QMouseEvent *event)
    {
        m_page->m_pressedButtons = event->buttons();
        m_page->m_keyboardModifiers = event->modifiers();
        QWebView::mousePressEvent(event);
    }

    void WebView::mouseReleaseEvent(QMouseEvent *event)
    {
        QWebView::mouseReleaseEvent(event);
    #ifndef QT_NO_CLIPBOARD
        if (!event->isAccepted() && (m_page->m_pressedButtons & Qt::MidButton)) {
            QUrl url(QApplication::clipboard()->text(QClipboard::Selection));
            if (!url.isEmpty() && url.isValid() && !url.scheme().isEmpty()) {
                setUrl(url);
            }
        }
    #endif
    }

    void WebView::setStatusBarText(const QString &string)
    {
        m_statusBarText = string;
    }

    void WebView::downloadRequested(const QNetworkRequest &request)
    {
        BrowserApplication::downloadManager()->download(request);
    }