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#ifndef PatternistSDK_TreeItem_H

#define PatternistSDK_TreeItem_H

#include <QObject>

#include "Global.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QVariant;

template<typename T> class QList;

template<typename T> class QPointer;

namespace QPatternistSDK

{

    /**

     * @short TreeItem is a node in a hierachial structure and is used together

     * with TreeModel.

     *

     * TreeItem is abstract base class. Instances of sub-classes of TreeItem

     * can be used with TreeModel in order to use hierarchial data in Qt's

     * model/view framework.

     *

     * TreeItem is a QObject in order to be able to be used with QPointer.

     *

     * @author Frans Englich <frans.englich@nokia.com>

     * @see TreeModel

     * @ingroup PatternistSDK

     */

    class Q_PATTERNISTSDK_EXPORT TreeItem : public QObject

    {

        Q_OBJECT

    public:

        typedef QList<QPointer<TreeItem> > List;

        virtual ~TreeItem() {}

        virtual void appendChild(TreeItem *item) = 0;

        virtual TreeItem *child(const unsigned int row) const = 0;

        virtual unsigned int childCount() const = 0;

        virtual TreeItem *parent() const = 0;

        virtual TreeItem::List children() const = 0;

        virtual int columnCount() const = 0;

        /**

         * Determines the position among the children of

         * this TreeItem's parent. This is done by introspecting the result

         * of children().

         */

        int row() const;

        virtual QVariant data(const Qt::ItemDataRole role, int column) const = 0;

    Q_SIGNALS:

        /**

         * Emitted whenever this item changed. This is used for keeping

         * views in synchronization with the item model which houses

         * this item.

         *

         * @param item the item which changed. That is, this TreeItem.

         */

        void changed(TreeItem *item);

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif

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