QWebEngineView Class

The QWebEngineView class provides a widget that is used to view and edit web documents. More...

Header: #include <QWebEngineView>
qmake: QT += webenginewidgets
Since: Qt 5.4
Inherits: QWidget

Properties

  • 59 properties inherited from QWidget
  • 1 property inherited from QObject

Public Functions

QWebEngineView(QWidget *parent = Q_NULLPTR)
virtual ~QWebEngineView()
void findText(const QString &subString, QWebEnginePage::FindFlags options = QWebEnginePage::FindFlags())
void findText(const QString &subString, QWebEnginePage::FindFlags options, FunctorOrLambda resultCallback)
bool hasSelection() const
QWebEngineHistory *history() const
QIcon icon() const
QUrl iconUrl() const
void load(const QUrl &url)
void load(const QWebEngineHttpRequest &request)
QWebEnginePage *page() const
QAction *pageAction(QWebEnginePage::WebAction action) const
QString selectedText() const
void setContent(const QByteArray &data, const QString &mimeType = QString(), const QUrl &baseUrl = QUrl())
void setHtml(const QString &html, const QUrl &baseUrl = QUrl())
void setPage(QWebEnginePage *page)
void setUrl(const QUrl &url)
void setZoomFactor(qreal factor)
QWebEngineSettings *settings() const
QString title() const
void triggerPageAction(QWebEnginePage::WebAction action, bool checked = false)
QUrl url() const
qreal zoomFactor() const

Reimplemented Public Functions

virtual QSize sizeHint() const
  • 214 public functions inherited from QWidget
  • 32 public functions inherited from QObject
  • 14 public functions inherited from QPaintDevice

Public Slots

void back()
void forward()
void reload()
void stop()
  • 19 public slots inherited from QWidget
  • 1 public slot inherited from QObject

Signals

void iconChanged(const QIcon &icon)
void iconUrlChanged(const QUrl &url)
void loadFinished(bool ok)
void loadProgress(int progress)
void loadStarted()
void renderProcessTerminated(QWebEnginePage::RenderProcessTerminationStatus terminationStatus, int exitCode)
void selectionChanged()
void titleChanged(const QString &title)
void urlChanged(const QUrl &url)

Protected Functions

virtual QWebEngineView *createWindow(QWebEnginePage::WebWindowType type)

Reimplemented Protected Functions

virtual void contextMenuEvent(QContextMenuEvent *event)
virtual void dragEnterEvent(QDragEnterEvent *e)
virtual void dragLeaveEvent(QDragLeaveEvent *e)
virtual void dragMoveEvent(QDragMoveEvent *e)
virtual void dropEvent(QDropEvent *e)
virtual bool event(QEvent *ev)
virtual void hideEvent(QHideEvent *event)
virtual void showEvent(QShowEvent *event)
  • 35 protected functions inherited from QWidget
  • 9 protected functions inherited from QObject
  • 1 protected function inherited from QPaintDevice

Additional Inherited Members

  • 5 static public members inherited from QWidget
  • 11 static public members inherited from QObject
  • 1 protected slot inherited from QWidget

Detailed Description

The QWebEngineView class provides a widget that is used to view and edit web documents.

A web view is the main widget component of the Qt WebEngine web browsing module. It can be used in various applications to display web content live from the Internet.

A web site can be loaded to a web view with the load() function. The GET method is always used to load URLs.

Like all Qt widgets, the show() function must be invoked in order to display the web view. The snippet below illustrates this:

    QWebEngineView *view = new QWebEngineView(parent);
    view->load(QUrl("http://qt-project.org/"));
    view->show();

Alternatively, setUrl() can be used to load a web site. If you have the HTML content readily available, you can use setHtml() instead.

The loadStarted() signal is emitted when the view begins loading and the loadProgress() signal is emitted whenever an element of the web view completes loading, such as an embedded image or a script. The loadFinished() signal is emitted when the view has been loaded completely. Its argument, either true or false, indicates whether loading was successful or failed.

The page() function returns a pointer to a web page object. A QWebEngineView contains a QWebEnginePage, which in turn allows access to the QWebEngineHistory in the page's context.

The title of an HTML document can be accessed with the title() property. Additionally, a web site may specify an icon, which can be accessed using the icon() or its URL using the iconUrl() property. If the title or the icon changes, the corresponding titleChanged(), iconChanged() and iconUrlChanged() signals will be emitted. The zoomFactor() property enables zooming the contents of the web page by a scale factor.

The widget features a context menu that is tailored to the element at hand, and includes actions useful in a browser. For a custom context menu, or for embedding actions in a menu or toolbar, the individual actions are available via pageAction(). The web view maintains the state of the returned actions, but allows modification of action properties such as text or icon. The action semantics can also be triggered directly through triggerPageAction().

If you want to provide support for web sites that allow the user to open new windows, such as pop-up windows, you can subclass QWebEngineView and reimplement the createWindow() function.

See also WebEngine Demo Browser Example, WebEngine Content Manipulation Example, and WebEngine Markdown Editor Example.

Property Documentation

hasSelection : const bool

This property holds whether this page contains selected content or not.

By default, this property is false.

Access functions:

bool hasSelection() const

See also selectionChanged().

icon : const QIcon

This property holds the icon associated with the page currently viewed

By default, this property contains a null icon.

This property was introduced in Qt 5.7.

Access functions:

QIcon icon() const

Notifier signal:

void iconChanged(const QIcon &icon)

See also iconChanged(), iconUrl(), and iconUrlChanged().

iconUrl : const QUrl

This property holds the URL of the icon associated with the page currently viewed

By default, this property contains an empty URL.

Access functions:

QUrl iconUrl() const

Notifier signal:

void iconUrlChanged(const QUrl &url)

See also iconUrlChanged(), icon(), and iconChanged().

selectedText : const QString

This property holds the text currently selected

By default, this property contains an empty string.

Access functions:

QString selectedText() const

See also findText() and selectionChanged().

title : const QString

This property holds the title of the web page currently viewed

By default, this property contains an empty string.

Access functions:

QString title() const

See also titleChanged().

url : QUrl

This property holds the URL of the web page currently viewed

Setting this property clears the view and loads the URL.

By default, this property contains an empty, invalid URL.

Access functions:

QUrl url() const
void setUrl(const QUrl &url)

See also load() and urlChanged().

zoomFactor : qreal

This property holds the zoom factor for the view

Valid values are within the range from 0.25 to 5.0. The default factor is 1.0.

Access functions:

qreal zoomFactor() const
void setZoomFactor(qreal factor)

Member Function Documentation

QWebEngineView::QWebEngineView(QWidget *parent = Q_NULLPTR)

Constructs an empty web view with the parent parent.

See also load().

[virtual] QWebEngineView::~QWebEngineView()

Destroys the web view.

[slot] void QWebEngineView::back()

Convenience slot that loads the previous document in the list of documents built by navigating links. Does nothing if there is no previous document.

It is equivalent to:

    view->page()->triggerAction(QWebEnginePage::Back);

See also forward() and pageAction().

[virtual protected] void QWebEngineView::contextMenuEvent(QContextMenuEvent *event)

Reimplemented from QWidget::contextMenuEvent().

[virtual protected] QWebEngineView *QWebEngineView::createWindow(QWebEnginePage::WebWindowType type)

This function is called from the createWindow() method of the associated QWebEnginePage each time the page wants to create a new window of the given type. For example, when a JavaScript request to open a document in a new window is issued.

Note: If the createWindow() method of the associated page is reimplemented, this method is not called, unless explicitly done so in the reimplementation.

See also QWebEnginePage::createWindow().

[virtual protected] void QWebEngineView::dragEnterEvent(QDragEnterEvent *e)

Reimplemented from QWidget::dragEnterEvent().

[virtual protected] void QWebEngineView::dragLeaveEvent(QDragLeaveEvent *e)

Reimplemented from QWidget::dragLeaveEvent().

[virtual protected] void QWebEngineView::dragMoveEvent(QDragMoveEvent *e)

Reimplemented from QWidget::dragMoveEvent().

[virtual protected] void QWebEngineView::dropEvent(QDropEvent *e)

Reimplemented from QWidget::dropEvent().

[virtual protected] bool QWebEngineView::event(QEvent *ev)

Reimplemented from QObject::event().

void QWebEngineView::findText(const QString &subString, QWebEnginePage::FindFlags options = QWebEnginePage::FindFlags())

Finds the specified string, subString, in the page, using the given options.

To clear the selection, just pass an empty string.

See also selectedText() and selectionChanged().

void QWebEngineView::findText(const QString &subString, QWebEnginePage::FindFlags options, FunctorOrLambda resultCallback)

Finds the specified string, subString, in the page, using the given options.

To clear the selection, just pass an empty string.

resultCallback must take a boolean parameter. It will be called with a value of true if subString was found; otherwise the callback value will be false.

See also selectedText() and selectionChanged().

[slot] void QWebEngineView::forward()

Convenience slot that loads the next document in the list of documents built by navigating links. Does nothing if there is no next document.

It is equivalent to:

    view->page()->triggerAction(QWebEnginePage::Forward);

See also back() and pageAction().

[virtual protected] void QWebEngineView::hideEvent(QHideEvent *event)

Reimplemented from QWidget::hideEvent().

QWebEngineHistory *QWebEngineView::history() const

Returns a pointer to the view's history of navigated web pages.

It is equivalent to:

    view->page()->history();

[signal] void QWebEngineView::iconChanged(const QIcon &icon)

This signal is emitted when the icon ("favicon") associated with the view is changed. The new icon is specified by icon.

This function was introduced in Qt 5.7.

Note: Notifier signal for property icon.

See also icon(), iconUrl(), and iconUrlChanged().

[signal] void QWebEngineView::iconUrlChanged(const QUrl &url)

This signal is emitted when the URL of the icon ("favicon") associated with the view is changed. The new URL is specified by url.

Note: Notifier signal for property iconUrl.

See also iconUrl(), icon(), and iconChanged().

void QWebEngineView::load(const QUrl &url)

Loads the specified url and displays it.

Note: The view remains the same until enough data has arrived to display the new URL.

See also load(), setUrl(), url(), urlChanged(), and QUrl::fromUserInput().

void QWebEngineView::load(const QWebEngineHttpRequest &request)

Issues the specified request and loads the response.

This function was introduced in Qt 5.9.

See also load(), setUrl(), url(), urlChanged(), and QUrl::fromUserInput().

[signal] void QWebEngineView::loadFinished(bool ok)

This signal is emitted when a load of the page has finished. ok will indicate whether the load was successful or an error occurred.

See also loadStarted().

[signal] void QWebEngineView::loadProgress(int progress)

This signal is emitted every time an element in the web view completes loading, such as an embedded image or a script. Therefore, it tracks the collective progress of loading the web view.

The current value is provided by progress and scales from 0 to 100, which is the default range of QProgressBar.

See also loadStarted() and loadFinished().

[signal] void QWebEngineView::loadStarted()

This signal is emitted when a new load of the page is started.

See also loadProgress() and loadFinished().

QWebEnginePage *QWebEngineView::page() const

Returns a pointer to the underlying web page.

See also setPage().

QAction *QWebEngineView::pageAction(QWebEnginePage::WebAction action) const

Returns a pointer to a QAction that encapsulates the specified web action action.

[slot] void QWebEngineView::reload()

Reloads the current document.

See also stop(), pageAction(), and loadStarted().

[signal] void QWebEngineView::renderProcessTerminated(QWebEnginePage::RenderProcessTerminationStatus terminationStatus, int exitCode)

This signal is emitted when the render process is terminated with a non-zero exit status. terminationStatus is the termination status of the process and exitCode is the status code with which the process terminated.

This function was introduced in Qt 5.6.

[signal] void QWebEngineView::selectionChanged()

This signal is emitted whenever the selection changes.

See also selectedText().

void QWebEngineView::setContent(const QByteArray &data, const QString &mimeType = QString(), const QUrl &baseUrl = QUrl())

Sets the content of the web view to the specified content data. If the mimeType argument is empty, it is currently assumed that the content is HTML but in future versions we may introduce auto-detection.

External objects referenced in the content are located relative to baseUrl.

The data is loaded immediately; external objects are loaded asynchronously.

See also load(), setHtml(), and QWebEnginePage::toHtml().

void QWebEngineView::setHtml(const QString &html, const QUrl &baseUrl = QUrl())

Sets the content of the web view to the specified html content.

External objects, such as stylesheets or images referenced in the HTML document, are located relative to baseUrl.

The HTML document is loaded immediately, whereas external objects are loaded asynchronously.

When using this method, Qt WebEngine assumes that external resources, such as JavaScript programs or style sheets, are encoded in UTF-8 unless otherwise specified. For example, the encoding of an external script can be specified through the charset attribute of the HTML script tag. Alternatively, the encoding can be specified by the web server.

This is a convenience function equivalent to setContent(html, "text/html;charset=UTF-8", baseUrl).

Warning: This function works only for HTML. For other MIME types (such as XHTML or SVG), setContent() should be used instead.

See also load(), setContent(), QWebEnginePage::toHtml(), and QWebEnginePage::setContent().

void QWebEngineView::setPage(QWebEnginePage *page)

Makes page the new web page of the web view.

The parent QObject of the provided page remains the owner of the object. If the current page is a child of the web view, it will be deleted.

See also page().

QWebEngineSettings *QWebEngineView::settings() const

Returns a pointer to the view or page specific settings object.

It is equivalent to:

    view->page()->settings();

See also QWebEngineSettings::globalSettings().

[virtual protected] void QWebEngineView::showEvent(QShowEvent *event)

Reimplemented from QWidget::showEvent().

[virtual] QSize QWebEngineView::sizeHint() const

Reimplemented from QWidget::sizeHint().

[slot] void QWebEngineView::stop()

Convenience slot that stops loading the document.

It is equivalent to:

    view->page()->triggerAction(QWebEnginePage::Stop);

See also reload(), pageAction(), and loadFinished().

[signal] void QWebEngineView::titleChanged(const QString &title)

This signal is emitted whenever the title of the view changes.

See also title().

void QWebEngineView::triggerPageAction(QWebEnginePage::WebAction action, bool checked = false)

Triggers the specified action. If it is a checkable action, the specified checked state is assumed.

The following example triggers the copy action and therefore copies any selected text to the clipboard.

    view->triggerPageAction(QWebEnginePage::Copy);

See also pageAction().

[signal] void QWebEngineView::urlChanged(const QUrl &url)

This signal is emitted when the url of the view changes.

See also url() and load().

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