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#include "qmlgraphicsgraphicsobjectcontainer_p.h"
#include <QGraphicsObject>
#include <QGraphicsWidget>
#include <QGraphicsSceneResizeEvent>
#include <private/qmlgraphicsitem_p.h>

QT_BEGIN_NAMESPACE

class QmlGraphicsGraphicsObjectContainerPrivate : public QmlGraphicsItemPrivate
{
    Q_DECLARE_PUBLIC(QmlGraphicsGraphicsObjectContainer)

public:
    QmlGraphicsGraphicsObjectContainerPrivate() : QmlGraphicsItemPrivate(), graphicsObject(0), syncedResize(false)
    { }

    void _q_updateSize();

    void setFiltering(bool on)
    {
        Q_Q(QmlGraphicsGraphicsObjectContainer);
        if (graphicsObject && graphicsObject->isWidget()) {
            if (!on) {
                graphicsObject->removeEventFilter(q);
                QObject::disconnect(q, SIGNAL(widthChanged()), q, SLOT(_q_updateSize()));
                QObject::disconnect(q, SIGNAL(heightChanged()), q, SLOT(_q_updateSize()));
            } else {
                graphicsObject->installEventFilter(q);
                QObject::connect(q, SIGNAL(widthChanged()), q, SLOT(_q_updateSize()));
                QObject::connect(q, SIGNAL(heightChanged()), q, SLOT(_q_updateSize()));
            }
        }
    }


    QGraphicsObject *graphicsObject;
    bool syncedResize;
};


/*!
    \qmlclass GraphicsObjectContainer QmlGraphicsGraphicsObjectContainer
    \brief The GraphicsObjectContainer element allows you to add QGraphicsObjects into Fluid UI elements.
*/

/*!
    \internal
    \class QmlGraphicsGraphicsObjectContainer
    \brief The QmlGraphicsGraphicsObjectContainer class allows you to add QGraphicsObjects into Fluid UI applications.
*/

QML_DEFINE_NOCREATE_TYPE(QGraphicsObject)
QML_DEFINE_TYPE(Qt,4,6,GraphicsObjectContainer,QmlGraphicsGraphicsObjectContainer)

QmlGraphicsGraphicsObjectContainer::QmlGraphicsGraphicsObjectContainer(QmlGraphicsItem *parent)
: QmlGraphicsItem(*new QmlGraphicsGraphicsObjectContainerPrivate, parent)
{
}

QmlGraphicsGraphicsObjectContainer::~QmlGraphicsGraphicsObjectContainer()
{
}

QGraphicsObject *QmlGraphicsGraphicsObjectContainer::graphicsObject() const
{
    Q_D(const QmlGraphicsGraphicsObjectContainer);
    return d->graphicsObject;
}

/*!
    \qmlproperty QGraphicsObject GraphicsObjectContainer::graphicsObject
    The QGraphicsObject associated with this element.
*/
void QmlGraphicsGraphicsObjectContainer::setGraphicsObject(QGraphicsObject *object)
{
    Q_D(QmlGraphicsGraphicsObjectContainer);
    if (object == d->graphicsObject)
        return;

    //### remove previously set item?

    d->setFiltering(false);

    d->graphicsObject = object;

    if (d->graphicsObject) {
        d->graphicsObject->setParentItem(this);

        if (d->syncedResize && d->graphicsObject->isWidget()) {
            QGraphicsWidget *gw = static_cast<QGraphicsWidget*>(d->graphicsObject);
            QSizeF gwSize = gw->size(); //### should we use sizeHint?
            QSizeF newSize = gwSize;
            if (heightValid())
                newSize.setHeight(height());
            if (widthValid())
                newSize.setWidth(width());
            if (gwSize != newSize)
                gw->resize(newSize);

            gwSize = gw->size();
            setImplicitWidth(gwSize.width());
            setImplicitHeight(gwSize.height());

            d->setFiltering(true);
        }
    }
}

QVariant QmlGraphicsGraphicsObjectContainer::itemChange(GraphicsItemChange change, const QVariant &value)
{
    Q_D(QmlGraphicsGraphicsObjectContainer);
    if (change == ItemSceneHasChanged) {
        QGraphicsObject *o = d->graphicsObject;
        d->graphicsObject = 0;
        setGraphicsObject(o);
    }
    return QmlGraphicsItem::itemChange(change, value);
}

bool QmlGraphicsGraphicsObjectContainer::eventFilter(QObject *watched, QEvent *e)
{
    Q_D(QmlGraphicsGraphicsObjectContainer);
    if (watched == d->graphicsObject && e->type() == QEvent::GraphicsSceneResize) {
        if (d->graphicsObject && d->graphicsObject->isWidget() && d->syncedResize) {
           QSizeF newSize = static_cast<QGraphicsWidget*>(d->graphicsObject)->size();
           setImplicitWidth(newSize.width());
           setImplicitHeight(newSize.height());
       }
    }
    return QmlGraphicsItem::eventFilter(watched, e);
}

/*!
    \qmlproperty bool GraphicsObjectContainer::synchronizedResizing

    This property determines whether or not the container and graphics object will synchronize their
    sizes.

    \note This property only applies when wrapping a QGraphicsWidget.

    If synchronizedResizing is enabled, the container and widget will
    synchronize their sizes as follows.
    \list
    \o If a size has been set on the container, the widget will be resized to the container.
    Any changes in the container's size will be reflected in the widget.

    \o \e Otherwise, the container will initially be sized to the preferred size of the widget.
    Any changes to the container's size will be reflected in the widget, and any changes to the
    widget's size will be reflected in the container.
    \endlist
*/
bool QmlGraphicsGraphicsObjectContainer::synchronizedResizing() const
{
    Q_D(const QmlGraphicsGraphicsObjectContainer);
    return d->syncedResize;
}

void QmlGraphicsGraphicsObjectContainer::setSynchronizedResizing(bool on)
{
    Q_D(QmlGraphicsGraphicsObjectContainer);
    if (on == d->syncedResize)
        return;

    d->syncedResize = on;
    d->setFiltering(on);
}

void QmlGraphicsGraphicsObjectContainerPrivate::_q_updateSize()
{
    if (!graphicsObject || !graphicsObject->isWidget() || !syncedResize)
        return;

    QGraphicsWidget *gw = static_cast<QGraphicsWidget*>(graphicsObject);
    const QSizeF newSize(width, height);
    gw->resize(newSize);

    //### will respecting the widgets min/max ever get us in trouble? (all other items always
    //    size to exactly what you tell them)
    /*QSizeF constrainedSize = newSize.expandedTo(gw->minimumSize()).boundedTo(gw->maximumSize());
    gw->resize(constrainedSize);
    if (constrainedSize != newSize) {
        setImplicitWidth(constrainedSize.width());
        setImplicitHeight(constrainedSize.height());
    }*/
}

#include "moc_qmlgraphicsgraphicsobjectcontainer_p.cpp"

QT_END_NAMESPACE