//=============================================================================
//  MuseScore
//  Music Composition & Notation
//
//  Copyright (C) 2020 MuseScore BVBA
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2
//  as published by the Free Software Foundation and appearing in
//  the file LICENCE.GPL
//=============================================================================

#ifndef __ELEMENTGROUP_H__
#define __ELEMENTGROUP_H__

namespace Ms {
class Element;
class EditData;

//-------------------------------------------------------------------
//   ElementGroup
///   Base class for implementing logic to handle groups of elements
///   together in certain operations.
//-------------------------------------------------------------------

class ElementGroup
{
public:
    virtual ~ElementGroup() {}

    virtual void startDrag(EditData&) = 0;
    virtual QRectF drag(EditData&) = 0;
    virtual void endDrag(EditData&) = 0;

    virtual bool enabled() const { return true; }
};

//-------------------------------------------------------------------
//   DisabledElementGroup
//-------------------------------------------------------------------

class DisabledElementGroup final : public ElementGroup
{
public:
    bool enabled() const override { return false; }

    void startDrag(EditData&) override {}
    QRectF drag(EditData&) override { return QRectF(); }
    void endDrag(EditData&) override {}
};

//-------------------------------------------------------------------
//   SingleElementGroup
///   Element group for single element.
//-------------------------------------------------------------------

class SingleElementGroup final : public ElementGroup
{
    Element* e;
public:
    SingleElementGroup(Element* el)
        : e(el) {}

    void startDrag(EditData& ed) override;
    QRectF drag(EditData& ed) override;
    void endDrag(EditData& ed) override;
};
} // namespace Ms

#endif