/*

 * Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: NMailUI web viewer. Inherits from

 *              QGrapohicsWebView and handles gestures, etc.

 */

#include "nmuiheaders.h"

/*!

    Constructor.

*/

NmMailViewerWK::NmMailViewerWK()

: QGraphicsWebView(),

  mContent(),

  mSuppressRelease(false)

{

    // Subscribe this widget to tap and pinch gestures.

    grabGesture(Qt::TapGesture);

    grabGesture(Qt::PinchGesture);

    // Prevent this widget from accepting focus.

}

/*!

    Destructor.

 */

NmMailViewerWK::~NmMailViewerWK()

{

    mContent.clear();

}

/*!

    Adds content into web view.

 */

void NmMailViewerWK::addContent(QString key, QVariant val, NmId partId, bool isFetched) 

{

    mContent[key] = NmMailViewerWkContentItem(val, partId, isFetched);

}

/*!

    Returns resource from added content.

 */

QVariant NmMailViewerWK::loadResource(int type, const QUrl &name, NmId &partId, bool &isFetched)

{

    NM_FUNCTION;

    if (type == QTextDocument::ImageResource) {

        QString key = '<' + name.path() + '>';

        if (!mContent.contains(key)) {

            key = name.path();

        }

        if (mContent.contains(key)) {

            partId = mContent[key].mPartId;

            isFetched = mContent[key].mIsFetched;

            return mContent[key].mData;

        }

    }

    return 0;

}

/*!

    This is the main event handler that processes all incoming events in an

    appropriate manner.

 */

bool NmMailViewerWK::event(QEvent* event)

{

    bool consumed = false;

    if (event) {

        switch (event->type()) {

        case QEvent::Gesture:

            // Handle gesture events.

            gestureEvent(static_cast<QGestureEvent*>(event));

            consumed = event->isAccepted();

            break;

        case QEvent::GraphicsSceneContextMenu:

            // Handle context-menu events.

            // contextMenuEvent() is invoked directly in order to override

            // text selection in QWebPage.

            contextMenuEvent(static_cast<QGraphicsSceneContextMenuEvent*>(event));

            consumed = event->isAccepted();

            break;

        default:

            // Invoke base class' event handler.

            consumed = QGraphicsWebView::event(event);

            break;

        }

    }

    return consumed;

}

/*!

    Handles context-menu events.

 */

void NmMailViewerWK::contextMenuEvent(QGraphicsSceneContextMenuEvent* event)

{

    if (event) {

        // Suppress context-menu invocations.

        event->accept();

    }

}

/*!

    Handles gesture events.

 */

void NmMailViewerWK::gestureEvent(QGestureEvent* event)

{

    if (event) {

        if (QTapGesture* tap = static_cast<QTapGesture*>(event->gesture(Qt::TapGesture))) {

            switch (tap->state()) {

            case Qt::GestureCanceled:

                // Tap cancellation suppresses the following mouse release.

                mSuppressRelease = true;

                break;

            default:

                // Other states disclose the following mouse release.

                mSuppressRelease = false;

                break;

            }

            event->accept();

        }

        if (QPinchGesture* pinch = static_cast<QPinchGesture*>(event->gesture(Qt::PinchGesture))) {

            // Handle pinch (zoom).

            // At the moment we simply consume the event.

            event->accept();

        }

    }

}

/*!

    Handles double-click events.

 */

void NmMailViewerWK::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event)

{

    if (event) {

        // Handle double clicks (instant zoom).

        // At the moment we simply consume the event.

        event->accept();

    }

}

/*!

    Handles mouse-move events.

 */

void NmMailViewerWK::mouseMoveEvent(QGraphicsSceneMouseEvent* event)

{

    if (event) {

        // Suppress drag selection.

        event->accept();

    }

}

/*!

    Handles mouse-release events.

 */

void NmMailViewerWK::mouseReleaseEvent(QGraphicsSceneMouseEvent* event)

{

    if (event) {

        // Suppress mouse release if the previous tap was cancelled.

        // Otherwise, invoke the base class' event handler.

        if (mSuppressRelease) {

            event->accept();

        } else {

            QGraphicsWebView::mouseReleaseEvent(event);

        }

    }

}