/*

    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.

*/

#include "config.h"

#include "qwebview.h"

#include "Page.h"

#include "QWebPageClient.h"

#include "Settings.h"

#include "qwebframe.h"

#include "qwebpage_p.h"

#include "qbitmap.h"

#include "qevent.h"

#include "qpainter.h"

#include "qprinter.h"

#include "qdir.h"

#include "qfile.h"

class QWebViewPrivate {

public:

    QWebViewPrivate(QWebView *view)

        : view(view)

        , page(0)

        , renderHints(QPainter::TextAntialiasing)

    {

        Q_ASSERT(view);

    }

    virtual ~QWebViewPrivate();

    void _q_pageDestroyed();

    void detachCurrentPage();

    QWebView *view;

    QWebPage *page;

    QPainter::RenderHints renderHints;

};

QWebViewPrivate::~QWebViewPrivate()

{

    detachCurrentPage();

}

void QWebViewPrivate::_q_pageDestroyed()

{

    page = 0;

    view->setPage(0);

}

#ifdef Q_WS_MAEMO_5

#include "qabstractkineticscroller.h"

#include "qapplication.h"

// QCoreApplication::sendSpontaneousEvent() is private, hence this friend wrapper

bool qt_sendSpontaneousEvent(QObject* receiver, QEvent* ev)

{

    return QCoreApplication::sendSpontaneousEvent(receiver, ev);

}

class QWebViewKineticScroller : public QObject, public QAbstractKineticScroller {

public:

    QWebViewKineticScroller()

        : QObject()

        , QAbstractKineticScroller()

        , m_view(0)

        , m_ignoreEvents(false)

    {

    }

    void setWidget(QWebView* widget)

    {

        if (m_view) {

            m_view->removeEventFilter(this);

            QWebFrame* frame = m_view->page()->mainFrame();

            frame->setScrollBarPolicy(Qt::Vertical, m_oldVerticalScrollBarPolicy);

            frame->setScrollBarPolicy(Qt::Horizontal, m_oldHorizontalScrollBarPolicy);

        }

        m_view = widget;

        setParent(m_view);

        if (m_view) {

            QWebFrame* frame = m_view->page()->mainFrame();

            m_oldHorizontalScrollBarPolicy = frame->scrollBarPolicy(Qt::Horizontal);

            m_oldVerticalScrollBarPolicy = frame->scrollBarPolicy(Qt::Vertical);

            frame->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);

            frame->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);

            m_view->installEventFilter(this);

        }

    }

protected:

    bool eventFilter(QObject* o, QEvent* ev)

    {

        if (!o || m_view != o || m_ignoreEvents || !m_view->isEnabled())

            return QObject::eventFilter(o, ev);

        bool res = false;

        switch (ev->type()) {

        case QEvent::MouseButtonPress: {

            // remember the frame where the button was pressed

            QWebFrame* hitFrame = scrollingFrameAt(static_cast<QMouseEvent*>(ev)->pos());

            if (hitFrame)

                m_frame = hitFrame;

            // fall through

        }

        case QEvent::MouseMove:

        case QEvent::MouseButtonRelease:

        case QEvent::MouseButtonDblClick:

            res = handleMouseEvent(static_cast<QMouseEvent*>(ev));

            break;

        default:

            break;

        }

        return res ? true : QObject::eventFilter(o, ev);

    }

    void cancelLeftMouseButtonPress(const QPoint& /* globalPressPos */)

    {

        QMouseEvent cmem(QEvent::MouseMove, QPoint(-INT_MAX, -INT_MAX), Qt::LeftButton, QApplication::mouseButtons() | Qt::LeftButton, QApplication::keyboardModifiers());

        sendEvent(m_view, &cmem);

        QMouseEvent cmer(QEvent::MouseButtonRelease, QPoint(-INT_MAX, -INT_MAX), Qt::LeftButton, QApplication::mouseButtons() & ~Qt::LeftButton, QApplication::keyboardModifiers());

        sendEvent(m_view, &cmer);

    }

    QWebFrame* currentFrame() const

    {

        if (m_frame)

            return m_frame;

        if (m_view)

            return m_view->page()->mainFrame();

        return 0;

    }

    // Returns the innermost frame at the given position that can scroll.

    QWebFrame* scrollingFrameAt(const QPoint& pos) const

    {

        QWebFrame* hitFrame = 0;

        if (m_view) {

            QWebFrame* frame = m_view->page()->mainFrame();

            hitFrame = frame->hitTestContent(pos).frame();

            QSize range = hitFrame->contentsSize() - hitFrame->geometry().size();

            while (hitFrame && range.width() <= 1 && range.height() <= 1)

                hitFrame = hitFrame->parentFrame();

            return hitFrame;

        }

    }

    QPoint maximumScrollPosition() const

    {

        QWebFrame* frame = currentFrame();

        QSize s = frame ? frame->contentsSize() - frame->geometry().size() : QSize(0, 0);

        return QPoint(qMax(0, s.width()), qMax(0, s.height()));

    }

    QPoint scrollPosition() const

    {

        QWebFrame* frame = currentFrame();

        return frame ? frame->scrollPosition() : QPoint();

    }

    QSize viewportSize() const

    {

        return m_view ? m_view->page()->viewportSize() : QSize();

    }

    void setScrollPosition(const QPoint& point, const QPoint& /* overShootDelta */)

    {

        QWebFrame* frame = currentFrame();

        if (frame)

            frame->setScrollPosition(point);

    }

    void sendEvent(QWidget* w, QEvent* ev)

    {

        m_ignoreEvents = true;

        qt_sendSpontaneousEvent(w, ev);

        m_ignoreEvents = false;

    }

    QWebView* m_view;

    bool m_ignoreEvents;

    QPointer<QWebFrame> m_frame;

    Qt::ScrollBarPolicy m_oldVerticalScrollBarPolicy;

    Qt::ScrollBarPolicy m_oldHorizontalScrollBarPolicy;

};

#endif // Q_WS_MAEMO_5

/*!

    \class QWebView

    \since 4.4

    \brief The QWebView class provides a widget that is used to view and edit

    web documents.

    \ingroup advanced

    \inmodule QtWebKit

    QWebView is the main widget component of the QtWebKit web browsing module.

    It can be used in various applications to display web content live from the

    Internet.

    The image below shows QWebView previewed in \QD with a Nokia website.

    \image qwebview-url.png

    A web site can be loaded onto QWebView with the load() function. Like all

    Qt widgets, the show() function must be invoked in order to display

    QWebView. The snippet below illustrates this:

    \snippet webkitsnippets/simple/main.cpp Using QWebView

    Alternatively, setUrl() can also 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. The

    loadProgress() signal, on the other hand, is emitted whenever an element of

    the web view completes loading, such as an embedded image, a script, etc.

    Finally, the loadFinished() signal is emitted when the view has loaded

    completely. It's argument - either \c true or \c false - indicates

    load success or failure.

    The page() function returns a pointer to the web page object. See

    \l{Elements of QWebView} for an explanation of how the web page

    is related to the view. To modify your web view's settings, you can access

    the QWebSettings object with the settings() function. With QWebSettings,

    you can change the default fonts, enable or disable features such as

    JavaScript and plugins.

    The title of an HTML document can be accessed with the title() property.

    Additionally, a web site may also specify an icon, which can be accessed

    using the icon() property. If the title or the icon changes, the corresponding

    titleChanged() and iconChanged() signals will be emitted. The

    textSizeMultiplier() property can be used to change the overall size of

    the text displayed in the web view.

    If you require a custom context menu, you can implement it by reimplementing

    \l{QWidget::}{contextMenuEvent()} and populating your QMenu with the actions

    obtained from pageAction(). More functionality such as reloading the view,

    copying selected text to the clipboard, or pasting into the view, is also

    encapsulated within the QAction objects returned by pageAction(). These

    actions can be programmatically triggered using triggerPageAction().

    Alternatively, the actions can be added to a toolbar or a menu directly.

    QWebView maintains the state of the returned actions but allows

    modification of action properties such as \l{QAction::}{text} or

    \l{QAction::}{icon}.

    A QWebView can be printed onto a QPrinter using the print() function.

    This function is marked as a slot and can be conveniently connected to

    \l{QPrintPreviewDialog}'s \l{QPrintPreviewDialog::}{paintRequested()}

    signal.

    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 QWebView and

    reimplement the createWindow() function.

    \section1 Elements of QWebView

    QWebView consists of other objects such as QWebFrame and QWebPage. The

    flowchart below shows these elements are related.

    \image qwebview-diagram.png

    \note It is possible to use QWebPage and QWebFrame, without using QWebView,

    if you do not require QWidget attributes. Nevertheless, QtWebKit depends

    on QtGui, so you should use a QApplication instead of QCoreApplication.

    \sa {Previewer Example}, {Web Browser}, {Form Extractor Example},

    {Google Chat Example}, {Fancy Browser Example}

*/

/*!

    Constructs an empty QWebView with parent \a parent.

    \sa load()

*/

QWebView::QWebView(QWidget *parent)

    : QWidget(parent)

{

    d = new QWebViewPrivate(this);

#if !defined(Q_WS_QWS) && !defined(Q_OS_SYMBIAN)

    setAttribute(Qt::WA_InputMethodEnabled);

#endif

#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)

    setAttribute(Qt::WA_AcceptTouchEvents);

#endif

#if defined(Q_WS_MAEMO_5)

    QAbstractKineticScroller* scroller = new QWebViewKineticScroller();

    static_cast<QWebViewKineticScroller*>(scroller)->setWidget(this);

    setProperty("kineticScroller", QVariant::fromValue(scroller));

#endif

    setAcceptDrops(true);

    setMouseTracking(true);

    setFocusPolicy(Qt::WheelFocus);

}

/*!

    Destroys the web view.

*/

QWebView::~QWebView()

{

    delete d;

}

/*!

    Returns a pointer to the underlying web page.

    \sa setPage()

*/

QWebPage *QWebView::page() const

{

    if (!d->page) {

        QWebView *that = const_cast<QWebView *>(this);

        that->setPage(new QWebPage(that));

    }

    return d->page;

}

void QWebViewPrivate::detachCurrentPage()

{

    if (!page)

        return;

    if (page) {

#if QT_VERSION >= 0x040600

        page->d->view.clear();

#else

        page->d->view = 0;

#endif

    }

    // if the page client is the special client constructed for

    // delegating the responsibilities to a QWidget, we need

    // to destroy it.

    if (page->d->client && page->d->client->isQWidgetClient())

        delete page->d->client;

    page->d->client = 0;

    // if the page was created by us, we own it and need to

    // destroy it as well.

    if (page->parent() == view)

        delete page;

    else

        page->disconnect(view);

    page = 0;

}

/*!

    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 document is a child of the web

    view, it will be deleted.

    \sa page()

*/

void QWebView::setPage(QWebPage* page)

{

    if (d->page == page)

        return;

    d->detachCurrentPage();

    d->page = page;

    if (d->page) {

        d->page->setView(this);

        d->page->setPalette(palette());

        // #### connect signals

        QWebFrame *mainFrame = d->page->mainFrame();

        connect(mainFrame, SIGNAL(titleChanged(QString)),

                this, SIGNAL(titleChanged(QString)));

        connect(mainFrame, SIGNAL(iconChanged()),

                this, SIGNAL(iconChanged()));

        connect(mainFrame, SIGNAL(urlChanged(QUrl)),

                this, SIGNAL(urlChanged(QUrl)));

        connect(d->page, SIGNAL(loadStarted()),

                this, SIGNAL(loadStarted()));

        connect(d->page, SIGNAL(loadProgress(int)),

                this, SIGNAL(loadProgress(int)));

        connect(d->page, SIGNAL(loadFinished(bool)),

                this, SIGNAL(loadFinished(bool)));

        connect(d->page, SIGNAL(statusBarMessage(QString)),

                this, SIGNAL(statusBarMessage(QString)));

        connect(d->page, SIGNAL(linkClicked(QUrl)),

                this, SIGNAL(linkClicked(QUrl)));

        connect(d->page, SIGNAL(microFocusChanged()),

                this, SLOT(updateMicroFocus()));

        connect(d->page, SIGNAL(destroyed()),

                this, SLOT(_q_pageDestroyed()));

    }

    setAttribute(Qt::WA_OpaquePaintEvent, d->page);

    update();

}

/*!

    Loads the specified \a url and displays it.

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

    \sa setUrl(), url(), urlChanged(), QUrl::fromUserInput()

*/

void QWebView::load(const QUrl &url)

{

    page()->mainFrame()->load(url);

}

/*!

    \fn void QWebView::load(const QNetworkRequest &request, QNetworkAccessManager::Operation operation, const QByteArray &body)

    Loads a network request, \a request, using the method specified in \a operation.

    \a body is optional and is only used for POST operations.

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

    \sa url(), urlChanged()

*/

void QWebView::load(const QNetworkRequest &request,

                    QNetworkAccessManager::Operation operation,

                    const QByteArray &body)

{

    page()->mainFrame()->load(request, operation, body);

}

/*!

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

    External objects such as stylesheets or images referenced in the HTML

    document are located relative to \a baseUrl.

    The \a html is loaded immediately; external objects are loaded asynchronously.

    When using this method, WebKit 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 also be specified by the web server.

    This is a convenience function equivalent to setContent(html, "text/html", baseUrl).

    \warning This function works only for HTML, for other mime types (i.e. XHTML, SVG)

    setContent() should be used instead.

    \sa load(), setContent(), QWebFrame::toHtml(), QWebFrame::setContent()

*/

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

{

    page()->mainFrame()->setHtml(html, baseUrl);

}

/*!

    Sets the content of the web view to the specified content \a data. If the \a 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 \a baseUrl.

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

    \sa load(), setHtml(), QWebFrame::toHtml()

*/

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

{

    page()->mainFrame()->setContent(data, mimeType, baseUrl);

}

/*!

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

    It is equivalent to

    \snippet webkitsnippets/qtwebkit_qwebview_snippet.cpp 0

*/

QWebHistory *QWebView::history() const

{

    return page()->history();

}

/*!

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

    It is equivalent to

    \snippet webkitsnippets/qtwebkit_qwebview_snippet.cpp 1

    \sa QWebSettings::globalSettings()

*/

QWebSettings *QWebView::settings() const

{

    return page()->settings();

}