myitem.cxx

#include "myitem.h"

MyItem::MyItem(QQuickItem *parent):
    QQuickItem(parent)
{
    // By default, QQuickItem does not draw anything. If you subclass
    // QQuickItem to create a visual item, you will need to uncomment the
    // following line and re-implement updatePaintNode()
    
    // setFlag(ItemHasContents, true);
}

MyItem::~MyItem()
{
}

myitem.h

#ifndef MYITEM_H
#define MYITEM_H

#include <QQuickItem>

class MyItem : public QQuickItem
{
    Q_OBJECT
    Q_DISABLE_COPY(MyItem)
    
public:
    MyItem(QQuickItem *parent = 0);
    ~MyItem();
};

QML_DECLARE_TYPE(MyItem)

#endif // MYITEM_H

untitled_plugin.cxx

#include "untitled_plugin.h"
#include "myitem.h"

#include <qqml.h>

void UntitledPlugin::registerTypes(const char *uri)
{
    // @uri com.mycompany.qmlcomponents
    qmlRegisterType<MyItem>(uri, 1, 0, "MyItem");
}

untitled_plugin.h

#ifndef UNTITLED_PLUGIN_H
#define UNTITLED_PLUGIN_H

#include <QQmlExtensionPlugin>

class UntitledPlugin : public QQmlExtensionPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtensionInterface")
    
public:
    void registerTypes(const char *uri);
};

#endif // UNTITLED_PLUGIN_H