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/****************************************************************************
**
** Copyright (C) 2016 Jochen Becher
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/

#ifndef QMT_TREEMODEL_H
#define QMT_TREEMODEL_H

#include <QStandardItemModel>
#include "qmt/infrastructure/qmt_global.h"

#include <qmt/stereotype/stereotypeicon.h>
#include <qmt/style/styleengine.h>

#include <QScopedPointer>
#include <QHash>

QT_BEGIN_NAMESPACE
class QIcon;
QT_END_NAMESPACE

namespace qmt {

class MElement;
class MObject;
class MDiagram;
class MRelation;
class ModelController;
class StereotypeController;
class StyleController;

class QMT_EXPORT TreeModel : public QStandardItemModel
{
    Q_OBJECT

    class ModelItem;
    class ItemFactory;
    class ItemUpdater;

public:
    enum ItemType {
        Package,
        Diagram,
        Element,
        Relation
    };

    enum Roles {
        RoleItemType = Qt::UserRole + 1
    };

    explicit TreeModel(QObject *parent = 0);
    ~TreeModel() override;

    ModelController *modelController() const { return m_modelController; }
    void setModelController(ModelController *modelController);
    StereotypeController *stereotypeController() const { return m_stereotypeController; }
    void setStereotypeController(StereotypeController *stereotypeController);
    StyleController *styleController() const { return m_styleController; }
    void setStyleController(StyleController *styleController);

    MElement *element(const QModelIndex &index) const;
    QModelIndex indexOf(const MElement *element) const;
    QIcon icon(const QModelIndex &index) const;

    Qt::DropActions supportedDropActions() const override;
    QStringList mimeTypes() const override;

private:
    void onBeginResetModel();
    void onEndResetModel();
    void onBeginUpdateObject(int row, const MObject *parent);
    void onEndUpdateObject(int row, const MObject *parent);
    void onBeginInsertObject(int row, const MObject *parent);
    void onEndInsertObject(int row, const MObject *parent);
    void onBeginRemoveObject(int row, const MObject *parent);
    void onEndRemoveObject(int row, const MObject *parent);
    void onBeginMoveObject(int formerRow, const MObject *formerOwner);
    void onEndMoveObject(int row, const MObject *owner);
    void onBeginUpdateRelation(int row, const MObject *parent);
    void onEndUpdateRelation(int row, const MObject *parent);
    void onBeginInsertRelation(int row, const MObject *parent);
    void onEndInsertRelation(int row, const MObject *parent);
    void onBeginRemoveRelation(int row, const MObject *parent);
    void onEndRemoveRelation(int row, const MObject *parent);
    void onBeginMoveRelation(int formerRow, const MObject *formerOwner);
    void onEndMoveRelation(int row, const MObject *owner);
    void onRelationEndChanged(MRelation *relation, MObject *endObject);
    void onModelDataChanged(const QModelIndex &topleft, const QModelIndex &bottomright);

    void clear();
    ModelItem *createItem(const MElement *element);
    void createChildren(const MObject *parentObject, ModelItem *parentItem);
    void removeObjectFromItemMap(const MObject *object);
    QString createObjectLabel(const MObject *object);
    QString createRelationLabel(const MRelation *relation);
    QIcon createIcon(StereotypeIcon::Element stereotypeIconElement,
                     StyleEngine::ElementType styleElementType, const QStringList &stereotypes,
                     const QString &defaultIconPath);

    enum Busy {
        NotBusy,
        ResetModel,
        UpdateElement,
        InsertElement,
        RemoveElement,
        MoveElement,
        UpdateDiagram,
        InsertDiagram,
        RemoveDiagram,
        MoveDiagram,
        UpdateRelation,
        InsertRelation,
        RemoveRelation,
        MoveRelation
    };

    ModelController *m_modelController;
    StereotypeController *m_stereotypeController;
    StyleController *m_styleController;
    ModelItem *m_rootItem;
    QHash<const MObject *, ModelItem *> m_objectToItemMap;
    QHash<ModelItem *, const MObject *> m_itemToObjectMap;
    Busy m_busyState;
};

} // namespace qmt

#endif // QMT_TREEMODEL_H