: QGraphicsWebView(),

  mContent(),

  mParentView(NULL),

  mSuppressRelease(false)

    // Subscribe this widget to tap and pinch gestures.

    grabGesture(Qt::TapGesture);

    // Prevent this widget from accepting focus.

    setFocusPolicy(Qt::NoFocus);

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

    appropriate manner.

bool NmMailViewerWK::event(QEvent* event)

            // Handle gesture events.

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

            consumed = event->isAccepted();

            // Handle context-menu events.

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

            // text selection in QWebPage.

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

            consumed = event->isAccepted();

            // Invoke base class' event handler.

            consumed = QGraphicsWebView::event(event);

    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 (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();

        }

}

/*!

    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);

        }

    }

}