/*

 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)

 * Copyright (C) 2009 Girish Ramakrishnan <girish@forwardbias.in>

 * Copyright (C) 2006 George Staikos <staikos@kde.org>

 * Copyright (C) 2006 Dirk Mueller <mueller@kde.org>

 * Copyright (C) 2006 Zack Rusin <zack@kde.org>

 * Copyright (C) 2006 Simon Hausmann <hausmann@kde.org>

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "webview.h"

#include <QtGui>

#include <QGraphicsScene>

WebViewGraphicsBased::WebViewGraphicsBased(QWidget* parent)

    : QGraphicsView(parent)

    , m_item(new GraphicsWebView)

    , m_numPaintsTotal(0)

    , m_numPaintsSinceLastMeasure(0)

    , m_measureFps(false)

    , m_resizesToContents(false)

{

    setScene(new QGraphicsScene(this));

    scene()->addItem(m_item);

    setFrameShape(QFrame::NoFrame);

    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

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

    QStateMachine* machine = new QStateMachine(this);

    QState* s0 = new QState(machine);

    s0->assignProperty(this, "yRotation", 0);

    QState* s1 = new QState(machine);

    s1->assignProperty(this, "yRotation", 90);

    QAbstractTransition* t1 = s0->addTransition(this, SIGNAL(yFlipRequest()), s1);

    QPropertyAnimation* yRotationAnim = new QPropertyAnimation(this, "yRotation", this);

    yRotationAnim->setDuration(1000);

    t1->addAnimation(yRotationAnim);

    QState* s2 = new QState(machine);

    s2->assignProperty(this, "yRotation", -90);

    s1->addTransition(s1, SIGNAL(propertiesAssigned()), s2);

    QAbstractTransition* t2 = s2->addTransition(s0);

    t2->addAnimation(yRotationAnim);

    machine->setInitialState(s0);

    machine->start();

#endif

    m_updateTimer = new QTimer(this);

    m_updateTimer->setInterval(1000);

    connect(m_updateTimer, SIGNAL(timeout()), this, SLOT(updateFrameRate()));

}

void WebViewGraphicsBased::setPage(QWebPage* page)

{

    connect(page->mainFrame(), SIGNAL(contentsSizeChanged(const QSize&)), SLOT(contentsSizeChanged(const QSize&)));

    m_item->setPage(page);

}

void WebViewGraphicsBased::contentsSizeChanged(const QSize& size)

{

    if (m_resizesToContents)

        scene()->setSceneRect(0, 0, size.width(), size.height());

}

void WebViewGraphicsBased::setResizesToContents(bool b)

{

    if (b == m_resizesToContents)

        return;

    m_resizesToContents = b;

    m_item->setResizesToContents(m_resizesToContents);

    // When setting resizesToContents ON, our web view widget will always size as big as the

    // web content being displayed, and so will the QWebPage's viewport. It implies that internally

    // WebCore will work as if there was no content rendered offscreen, and then no scrollbars need

    // drawing. In order to keep scrolling working, we:

    //

    // 1) Set QGraphicsView's scrollbars policy back to 'auto'.

    // 2) Set scene's boundaries rect to an invalid size, which automatically makes it to be as big

    //    as it needs to enclose all items onto it. We do that because QGraphicsView also calculates

    //    the size of its scrollable area according to the amount of content in scene that is rendered

    //    offscreen.

    // 3) Set QWebPage's preferredContentsSize according to the size of QGraphicsView's viewport,

    //    so WebCore properly lays pages out.

    //

    // On the other hand, when toggling resizesToContents OFF, we set back the default values, as

    // opposite as described above.

    if (m_resizesToContents) {

        setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);

        setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

        m_item->page()->setPreferredContentsSize(size());

        QRectF itemRect(m_item->geometry().topLeft(), m_item->page()->mainFrame()->contentsSize());

        m_item->setGeometry(itemRect);

        scene()->setSceneRect(itemRect);

    } else {

        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

        setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

        m_item->page()->setPreferredContentsSize(QSize());

        QRect viewportRect(QPoint(0, 0), size());

        m_item->setGeometry(viewportRect);

        scene()->setSceneRect(viewportRect);

    }

}

void WebViewGraphicsBased::resizeEvent(QResizeEvent* event)

{

    QGraphicsView::resizeEvent(event);

    QSize size(event->size());

    if (m_resizesToContents) {

        m_item->page()->setPreferredContentsSize(size);

        return;

    }

    QRectF rect(QPoint(0, 0), size);

    m_item->setGeometry(rect);

    scene()->setSceneRect(rect);

}

void WebViewGraphicsBased::setFrameRateMeasurementEnabled(bool enabled)

{

    m_measureFps = enabled;

    if (m_measureFps) {

        m_lastConsultTime = m_startTime = QTime::currentTime();

        m_fpsTimer.start();

        m_updateTimer->start();

    } else {

        m_fpsTimer.stop();

        m_updateTimer->stop();

    }

}

void WebViewGraphicsBased::updateFrameRate()

{

    const QTime now = QTime::currentTime();

    int interval = m_lastConsultTime.msecsTo(now);

    int frames = m_fpsTimer.numFrames(interval);

    int current = interval ? frames * 1000 / interval : 0;

    emit currentFPSUpdated(current);

    m_lastConsultTime = now;

}

void WebViewGraphicsBased::animatedFlip()

{

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

    QSizeF center = m_item->boundingRect().size() / 2;

    QPointF centerPoint = QPointF(center.width(), center.height());

    m_item->setTransformOriginPoint(centerPoint);

    QPropertyAnimation* animation = new QPropertyAnimation(m_item, "rotation", this);

    animation->setDuration(1000);

    int rotation = int(m_item->rotation());

    animation->setStartValue(rotation);

    animation->setEndValue(rotation + 180 - (rotation % 180));

    animation->start(QAbstractAnimation::DeleteWhenStopped);

#endif

}

void WebViewGraphicsBased::animatedYFlip()

{

    emit yFlipRequest();

}

void WebViewGraphicsBased::paintEvent(QPaintEvent* event)

{

    QGraphicsView::paintEvent(event);

    if (!m_measureFps)

        return;

}

static QMenu* createContextMenu(QWebPage* page, QPoint position)

{

    QMenu* menu = page->createStandardContextMenu();

    QWebHitTestResult r = page->mainFrame()->hitTestContent(position);

    if (!r.linkUrl().isEmpty()) {

        WebPage* webPage = qobject_cast<WebPage*>(page);

        QAction* newTabAction = menu->addAction("Open in Default &Browser", webPage, SLOT(openUrlInDefaultBrowser()));

        newTabAction->setData(r.linkUrl());

        menu->insertAction(menu->actions().at(2), newTabAction);

    }

    return menu;

}

void GraphicsWebView::mousePressEvent(QGraphicsSceneMouseEvent* event)

{

    setProperty("mouseButtons", QVariant::fromValue(int(event->buttons())));

    setProperty("keyboardModifiers", QVariant::fromValue(int(event->modifiers())));

    QGraphicsWebView::mousePressEvent(event);

}

void WebViewTraditional::mousePressEvent(QMouseEvent* event)

{

    setProperty("mouseButtons", QVariant::fromValue(int(event->buttons())));

    setProperty("keyboardModifiers", QVariant::fromValue(int(event->modifiers())));

    QWebView::mousePressEvent(event);

}

void GraphicsWebView::contextMenuEvent(QGraphicsSceneContextMenuEvent* event)

{

    QMenu* menu = createContextMenu(page(), event->pos().toPoint());

    menu->exec(event->screenPos());

    delete menu;

}

void WebViewTraditional::contextMenuEvent(QContextMenuEvent* event)

{

    QMenu* menu = createContextMenu(page(), event->pos());

    menu->exec(event->globalPos());

    delete menu;

}