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** This file is part of the QtDeclarative module of the Qt Toolkit.
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#include "qfxcomponentinstance.h"
#include "qfxcomponentinstance_p.h"
#include <private/qfxperf_p.h>
#include <QtDeclarative/qmlinfo.h>


QT_BEGIN_NAMESPACE
QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,ComponentInstance,QFxComponentInstance)

/*!
    \internal
    \class QFxComponentInstance ComponentInstance

    \brief The QFxComponentInstance class provides a way to instantiate an item from a component.
 */

/*!
    \qmlclass ComponentInstance QFxComponentInstance
    \brief The ComponentInstance item allows you to instantiate a \l{Component}.

    \qml
    Item {
        Component {
            id: RedSquare
            Rectangle { color: "red"; width: 10; height: 10 }
        }

        ComponentInstance { component: RedSquare }
    }
    \endqml
*/
QFxComponentInstance::QFxComponentInstance(QFxItem *parent)
  : QFxItem(*(new QFxComponentInstancePrivate), parent)
{
    setFlag(QGraphicsItem::ItemAutoDetectsFocusProxy);
}

QFxComponentInstance::QFxComponentInstance(QFxComponentInstancePrivate &dd, QFxItem *parent)
  : QFxItem(dd, parent)
{
    setFlag(QGraphicsItem::ItemAutoDetectsFocusProxy);
}

/*!
    \qmlproperty Component QFxComponentInstance::component

    This property holds the component to instantiate.
*/
QmlComponent *QFxComponentInstance::component() const
{
    Q_D(const QFxComponentInstance);
    return d->component;
}

void QFxComponentInstance::setComponent(QmlComponent *c)
{
    Q_D(QFxComponentInstance);
    if (d->component) {
        qmlInfo(this) << "component is a write-once property.";
        return;
    }
    d->component = c;
    create();
}

void QFxComponentInstance::create()
{
    Q_D(QFxComponentInstance);
    if (d->component) {
        QObject *obj= d->component->create(qmlContext(this));
        if (obj) {
            QFxItem *objitem = qobject_cast<QFxItem *>(obj);
            if (objitem) {
                d->instance = objitem;
                objitem->setParentItem(this);
                objitem->setFocus(true);
                connect(objitem, SIGNAL(widthChanged()), this, SLOT(updateSize()));
                connect(objitem, SIGNAL(heightChanged()), this, SLOT(updateSize()));
                updateSize();
                emit instanceChanged();
            } else {
                delete obj;
            }
        }   
    }
}

void QFxComponentInstance::updateSize()
{
    QFxItem *i = instance();
    if (i) {
        if (!widthValid())
            setImplicitWidth(i->width());
        if (!heightValid())
            setImplicitHeight(i->height());
    }
}

/*!
    \qmlproperty Item QFxComponentInstance::instance

    This property holds the instantiated component.
*/
QFxItem *QFxComponentInstance::instance() const
{
    Q_D(const QFxComponentInstance);
    return d->instance;
}

QT_END_NAMESPACE