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/*
   This file is part of the Nepomuk KDE project.
   Copyright (C) 2007-2010 Sebastian Trueg <trueg@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) version 3, or any
   later version accepted by the membership of KDE e.V. (or its
   successor approved by the membership of KDE e.V.), which shall
   act as a proxy defined in Section 6 of version 3 of the license.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _NEPOMUK_RESOUCE_MODEL_H_
#define _NEPOMUK_RESOUCE_MODEL_H_

#include <QtCore/QAbstractItemModel>

#include "nepomukutils_export.h"

namespace Nepomuk {

    class Resource;

    namespace Utils {
        /**
         * \class ResourceModel resourcemodel.h Nepomuk/Utils/ResourceModel
         *
         * \brief Base class for all models providing a plain list of resources.
         *
         * The %ResourceModel is a base class for models that handle a set of
         * %Nepomuk Resource instances. This can be a simple list as in SimpleResourceModel
         * or a set of query results as in ResultModel. It could also be a dynamic list
         * which is updated while the user scrolls it.
         *
         * %ResourceModel cannot be instanciated by itself. Use one of the subclasses
         * or derive your own subclass from it.
         *
         * At least the following methods need to be implemented in a subclass:
         * \li resourceForIndex()
         * \li indexForResource(),
         * \li QAbstractItemModel::rowCount()
         * \li QAbstractItemModel::index()
         *
         * \author Sebastian Trueg <trueg@kde.org>
         *
         * \since 4.6
         */
        class NEPOMUKUTILS_EXPORT ResourceModel : public QAbstractItemModel
        {
            Q_OBJECT

        public:
            /**
             * Constructor.
             */
            ResourceModel( QObject* parent = 0 );

            /**
             * Destructor
             */
            virtual ~ResourceModel();

            /**
             * The columns supported by ResourceModel are identified
             * by this enumeration.
             */
            enum ResourceModelColumns {
                /// The first column displays the label of the resource and its icon
                ResourceColumn = 0,

                /// The second column displays the resource's type
                ResourceTypeColumn = 1,

                /// The number of columns
                ResourceModelColumnCount = 2
            };

            /**
             * Custom roles that can be accessed for example in delegates.
             */
            enum ResourceRoles {
                /**
                 * The resource itself, provided as a Nepomuk::Resource instance.
                 */
                ResourceRole = 7766897,

                /**
                 * The type of the resource, provided as a Nepomuk::Types::Class
                 * instance.
                 */
                ResourceTypeRole = 687585,

                /**
                 * The creation date of the resource.
                 */
                ResourceCreationDateRole = 7766898
            };

            /**
             * Get the Resource which corresponds to \p index.
             *
             * \return The Resource which corresponds to \p index or an invalid Resource
             * if \p index is invalid.
             */
            virtual Resource resourceForIndex( const QModelIndex& index ) const = 0;

            /**
             * Get the index for a resource.
             *
             * \return The index which corresponds to \p res of an invalid QModelIndex
             * if \p res is not part of this model.
             */
            virtual QModelIndex indexForResource( const Resource& res ) const = 0;

            /**
             * The default implementation returns an invalid QModelIndex, thus providing
             * a plain list.
             */
            virtual QModelIndex parent( const QModelIndex& child ) const;

            /**
             * The default implementation returns 2 with the first column representing the resource
             * itself and the second one showing the type.
             */
            virtual int columnCount( const QModelIndex& parent ) const;

            /**
             * Handles most roles typically used in applications like Qt::DisplayRole, Qt::ToolTipRole,
             * and Qt::DecorationRole. Additionally KCategorizedSortFilterProxyModel roles are supported
             * categorizing by resource types.
             */
            virtual QVariant data( const QModelIndex& index, int role = Qt::DisplayRole ) const;

            /**
             * Provides header data for the supported columns.
             */
            virtual QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;

            /**
             * Reimplemented to support dragging of resources out of the model.
             */
            virtual Qt::ItemFlags flags( const QModelIndex& index ) const;

            /**
             * Stores the resource URIs via KUrl::List::populateMimeData() and as a specific
             * "application/x-nepomuk-resource-uri" mime type to indicate that these are URIs
             * corresponding to actual %Nepomuk resources.
             */
            virtual QMimeData* mimeData( const QModelIndexList& indexes ) const;

            /**
             * \return The KUrl mime types and "application/x-nepomuk-resource-uri".
             */
            virtual QStringList mimeTypes() const;

            /**
             * Provided for future extensions.
             */
            virtual bool setData( const QModelIndex& index, const QVariant& value, int role );

        private:
            class Private;
            Private* const d;
        };
    }
}

#endif