/*
    Copyright (C) 2019 The Qt Company Ltd.
    Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
    Copyright (C) 2008 Holger Hans Peter Freyther
    Copyright (C) 2009 Girish Ramakrishnan <girish@forwardbias.in>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

// The documentation in this file was imported from QtWebKit and is thus constrained
// by its LGPL license. Documentation written from scratch for new methods should be
// placed inline in the code as usual.

/*!
    \class QWebEngineView
    \brief The QWebEngineView class provides a widget that is used to view and edit
    web documents.
    \since 5.4
    \ingroup advanced

    \inmodule QtWebEngineWidgets

    A \e {web view} is the main widget component of the \QWE web browsing module.
    It can be used in various applications to display web content live from the
    Internet.

    A \e {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:

    \snippet simple/main.cpp Using QWebEngineView

    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 \c true or \c false, indicates whether loading was
    successful or failed.

    The page() function returns a pointer to a \e {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 \l pageAction(). The web view maintains the state of the returned actions,
    but allows modification of action properties such as \l{QAction::}{text} or
    \l{QAction::}{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.

    \sa {WebEngine Widgets Simple Browser Example}, {WebEngine Content Manipulation Example}, {WebEngine Markdown Editor Example}
*/


/*!
    \fn QWebEngineView::QWebEngineView(QWidget *parent)
    Constructs an empty web view with the parent \a parent.

    \sa load()
*/

/*!
    \fn QWebEngineView::~QWebEngineView()
    Destroys the web view.
*/

/*!
    \fn QWebEnginePage *QWebEngineView::page() const
    Returns a pointer to the underlying web page.

    \sa setPage()
*/

/*!
    \fn void QWebEngineView::setPage(QWebEnginePage* page)
    Makes \a 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.

    \sa page()
*/

/*!
    \fn void QWebEngineView::load(const QUrl &url)
    Loads the specified \a url and displays it.

    \note The view remains the same until enough data has arrived to display the new URL.

    \sa load(), setUrl(), url(), urlChanged(), QUrl::fromUserInput()
*/

/*!
    \fn void QWebEngineView::setHtml(const QString &html, const QUrl &baseUrl)
    Sets the content of the web view to the specified \a html content.

    External objects, such as stylesheets or images referenced in the HTML
    document, are located relative to \a baseUrl. For external objects to
    be loaded, \c baseUrl cannot be empty. For example, if \a html
    is retrieved from \c http://www.example.com/documents/overview.html, which
    is the base URL, then an image referenced with the relative URL, \c diagram.png,
    should be at \c{http://www.example.com/documents/diagram.png}.

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

    When using this method, \QWE 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 \c charset attribute of the HTML script tag. Alternatively, the
    encoding can be specified by the web server.

    This is a convenience function equivalent to
    \c{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.

    \note Content larger than 2 MB cannot be displayed, because setHtml()
    converts the provided HTML to percent-encoding and places \c data: in front
    of it to create the URL that it navigates to. Thereby, the provided code
    becomes a URL that exceeds the 2 MB limit set by Chromium. If the content is
    too large, the loadFinished() signal is triggered with \c success=false.

    \sa load(), setContent(), QWebEnginePage::toHtml(), QWebEnginePage::setContent()
*/

/*!
    \fn void QWebEngineView::setContent(const QByteArray &data, const QString &mimeType, const QUrl &baseUrl)
    Sets the content of the web view to \a data. If the \a mimeType argument
    is empty, it is assumed that the content is \c{text/plain,charset=US-ASCII}.

    External objects referenced in the content are located relative to \a baseUrl.
    For external objects to be loaded, \c baseUrl cannot be empty.

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

    \sa load(), setHtml(), QWebEnginePage::toHtml()
*/

/*!
    \fn QWebEngineHistory *QWebEngineView::history() const
    Returns a pointer to the view's history of navigated web pages.

    It is equivalent to:

    \snippet qtwebengine_qwebengineview_snippet.cpp 0
*/

/*!
    \property QWebEngineView::title
    \brief The title of the page as defined by the HTML \c <title> element.

    Equivalent to \l {QWebEnginePage::title()}.

    \sa titleChanged()
*/

/*!
    \property QWebEngineView::url
    \brief 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.

    \sa load(), urlChanged()
*/

/*!
    \property QWebEngineView::iconUrl
    \brief The URL of the icon associated with the page currently viewed.

    By default, this property contains an empty URL.

    \sa iconUrlChanged(), icon(), iconChanged()
*/

/*!
    \property QWebEngineView::hasSelection
    \brief Whether this page contains selected content or not.

    By default, this property is \c false.

    \sa selectionChanged()
*/

/*!
    \property QWebEngineView::selectedText
    \brief The text currently selected.

    By default, this property contains an empty string.

    \sa findText(), selectionChanged()
*/

/*!
    \fn QAction *QWebEngineView::pageAction(QWebEnginePage::WebAction action) const
    Returns a pointer to a QAction that encapsulates the specified web action \a action.
*/

/*!
    \fn void QWebEngineView::triggerPageAction(QWebEnginePage::WebAction action, bool checked)
    Triggers the specified \a action. If it is a checkable action, the specified
    \a checked state is assumed.

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

    \snippet qtwebengine_qwebengineview_snippet.cpp 2

    \sa pageAction()
*/

/*!
    \property QWebEngineView::zoomFactor
    \brief The zoom factor for the view.

    Valid values are within the range from \c{0.25} to \c{5.0}. The default factor is \c{1.0}.
*/

/*!
    \fn void QWebEngineView::findText(const QString &subString, QWebEnginePage::FindFlags options = QWebEnginePage::FindFlags(), const QWebEngineCallback<bool> &resultCallback = QWebEngineCallback<bool>())
    Finds the specified string, \a subString, in the page, using the given \a options.

    To clear the selection, just pass an empty string.

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

    \warning We guarantee that the callback (\a resultCallback) is always called, but it might be done
    during page destruction. When QWebEnginePage is deleted, the callback is triggered with an invalid
    value and it is not safe to use the corresponding QWebEnginePage or QWebEngineView instance inside it.

    \sa selectedText(), selectionChanged()
*/

/*!
    \fn void QWebEngineView::stop()
    Convenience slot that stops loading the document.

    It is equivalent to:

    \snippet qtwebengine_qwebengineview_snippet.cpp 3

    \sa reload(), pageAction(), loadFinished()
*/

/*!
    \fn 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:

    \snippet qtwebengine_qwebengineview_snippet.cpp 4

    \sa forward(), pageAction()
*/

/*!
    \fn 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:

    \snippet qtwebengine_qwebengineview_snippet.cpp 5

    \sa back(), pageAction()
*/

/*!
    \fn void QWebEngineView::reload()
    Reloads the current document.

    \sa stop(), pageAction(), loadStarted()
*/

/*!
    \fn QWebEngineView *QWebEngineView::createWindow(QWebEnginePage::WebWindowType type)
    This function is called from the \l{QWebEnginePage::}{createWindow()} method of the associated
    QWebEnginePage each time the page wants to create a new window of the given \a type. For
    example, when a JavaScript request to open a document in a new window is issued.

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

    \sa QWebEnginePage::createWindow()
*/

/*!
    \fn void QWebEngineView::titleChanged(const QString &title)

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

    \sa title()
*/

/*!
    \fn void QWebEngineView::urlChanged(const QUrl &url)

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

    \sa url(), load()
*/

/*!
    \fn 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 \a url.

    \sa iconUrl(), icon(), iconChanged()
*/

/*!
    \fn void QWebEngineView::loadStarted()

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

    \sa loadProgress(), loadFinished()
*/

/*!
    \fn void QWebEngineView::loadFinished(bool ok)

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

    \sa loadStarted()
*/

/*!
    \fn void QWebEngineView::selectionChanged()

    This signal is emitted whenever the selection changes.

    \note When using the mouse to select text by left-clicking and dragging, the signal will be
    emitted for each new character selected, and not upon releasing the left mouse button.

    \sa selectedText()
*/

/*!
    \fn 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 \a progress and scales from 0 to 100,
    which is the default range of QProgressBar.

    \sa loadStarted(), loadFinished()
*/

/*!
    \fn QWebEngineSettings *QWebEngineView::settings() const

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

    It is equivalent to:

    \snippet qtwebengine_qwebengineview_snippet.cpp 6

    \sa QWebEngineSettings::defaultSettings()
*/
