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****************************************************************************/

#include "customproxy.h"

#include <QtGui>

CustomProxy::CustomProxy(QGraphicsItem *parent, Qt::WindowFlags wFlags)

    : QGraphicsProxyWidget(parent, wFlags), popupShown(false), currentPopup(0)

{

    timeLine = new QTimeLine(250, this);

    connect(timeLine, SIGNAL(valueChanged(qreal)),

            this, SLOT(updateStep(qreal)));

    connect(timeLine, SIGNAL(stateChanged(QTimeLine::State)),

            this, SLOT(stateChanged(QTimeLine::State)));

}

QRectF CustomProxy::boundingRect() const

{

    return QGraphicsProxyWidget::boundingRect().adjusted(0, 0, 10, 10);

}

void CustomProxy::paintWindowFrame(QPainter *painter, const QStyleOptionGraphicsItem *option,

                                   QWidget *widget)

{

    const QColor color(0, 0, 0, 64);

    QRectF r = windowFrameRect();

    QRectF right(r.right(), r.top() + 10, 10, r.height() - 10);

    QRectF bottom(r.left() + 10, r.bottom(), r.width(), 10);

    bool intersectsRight = right.intersects(option->exposedRect);

    bool intersectsBottom = bottom.intersects(option->exposedRect);

    if (intersectsRight && intersectsBottom) {

        QPainterPath path;

        path.addRect(right);

        path.addRect(bottom);

        painter->setPen(Qt::NoPen);

        painter->setBrush(color);

        painter->drawPath(path);

    } else if (intersectsBottom) {

        painter->fillRect(bottom, color);

    } else if (intersectsRight) {

        painter->fillRect(right, color);

    }

    QGraphicsProxyWidget::paintWindowFrame(painter, option, widget);

}

void CustomProxy::hoverEnterEvent(QGraphicsSceneHoverEvent *event)

{

    QGraphicsProxyWidget::hoverEnterEvent(event);

    scene()->setActiveWindow(this);

    if (timeLine->currentValue() != 1)

        zoomIn();

}

void CustomProxy::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)

{

    QGraphicsProxyWidget::hoverLeaveEvent(event);

    if (!popupShown && (timeLine->direction() != QTimeLine::Backward || timeLine->currentValue() != 0))

        zoomOut();

}

bool CustomProxy::sceneEventFilter(QGraphicsItem *watched, QEvent *event)

{

    if (watched->isWindow() && (event->type() == QEvent::UngrabMouse || event->type() == QEvent::GrabMouse)) {

        popupShown = watched->isVisible();

        if (!popupShown && !isUnderMouse())

            zoomOut();

    }

    return QGraphicsProxyWidget::sceneEventFilter(watched, event);

}

QVariant CustomProxy::itemChange(GraphicsItemChange change, const QVariant &value)

{

    if (change == ItemChildAddedChange || change == ItemChildRemovedChange) {

        if (change == ItemChildAddedChange) {

            currentPopup = qVariantValue<QGraphicsItem *>(value);

            currentPopup->setCacheMode(ItemCoordinateCache);

            if (scene())

                currentPopup->installSceneEventFilter(this);

        } else if (scene()) {

            currentPopup->removeSceneEventFilter(this);

            currentPopup = 0;

        }

    } else if (currentPopup && change == ItemSceneHasChanged) {

        currentPopup->installSceneEventFilter(this);

    }

    return QGraphicsProxyWidget::itemChange(change, value);

}

void CustomProxy::updateStep(qreal step)

{

    QRectF r = boundingRect();

    setTransform(QTransform()

                 .translate(r.width() / 2, r.height() / 2)

                 .rotate(step * 30, Qt::XAxis)

                 .rotate(step * 10, Qt::YAxis)

                 .rotate(step * 5, Qt::ZAxis)

                 .scale(1 + 1.5 * step, 1 + 1.5 * step)

                 .translate(-r.width() / 2, -r.height() / 2));

}

void CustomProxy::stateChanged(QTimeLine::State state)

{

    if (state == QTimeLine::Running) {

	if (timeLine->direction() == QTimeLine::Forward)

            setCacheMode(ItemCoordinateCache);

    } else if (state == QTimeLine::NotRunning) {

	if (timeLine->direction() == QTimeLine::Backward)

            setCacheMode(DeviceCoordinateCache);

    }

}

void CustomProxy::zoomIn()

{

    if (timeLine->direction() != QTimeLine::Forward)

        timeLine->setDirection(QTimeLine::Forward);

    if (timeLine->state() == QTimeLine::NotRunning) 

        timeLine->start();

}

void CustomProxy::zoomOut()

{

    if (timeLine->direction() != QTimeLine::Backward)

        timeLine->setDirection(QTimeLine::Backward);

    if (timeLine->state() == QTimeLine::NotRunning) 

        timeLine->start();

}