70 lines
2 KiB
C++
70 lines
2 KiB
C++
//=============================================================================
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// MuseScore
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// Music Composition & Notation
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//
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// Copyright (C) 2020 MuseScore BVBA
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2
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// as published by the Free Software Foundation and appearing in
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// the file LICENCE.GPL
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//=============================================================================
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#ifndef __ELEMENTGROUP_H__
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#define __ELEMENTGROUP_H__
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namespace Ms {
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class Element;
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class EditData;
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//-------------------------------------------------------------------
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// ElementGroup
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/// Base class for implementing logic to handle groups of elements
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/// together in certain operations.
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//-------------------------------------------------------------------
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class ElementGroup
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{
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public:
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virtual ~ElementGroup() {}
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virtual void startDrag(EditData&) = 0;
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virtual QRectF drag(EditData&) = 0;
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virtual void endDrag(EditData&) = 0;
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virtual bool enabled() const { return true; }
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};
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//-------------------------------------------------------------------
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// DisabledElementGroup
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//-------------------------------------------------------------------
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class DisabledElementGroup final : public ElementGroup
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{
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public:
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bool enabled() const override { return false; }
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void startDrag(EditData&) override {}
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QRectF drag(EditData&) override { return QRectF(); }
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void endDrag(EditData&) override {}
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};
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//-------------------------------------------------------------------
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// SingleElementGroup
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/// Element group for single element.
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//-------------------------------------------------------------------
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class SingleElementGroup final : public ElementGroup
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{
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Element* e;
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public:
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SingleElementGroup(Element* el)
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: e(el) {}
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void startDrag(EditData& ed) override;
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QRectF drag(EditData& ed) override;
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void endDrag(EditData& ed) override;
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};
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} // namespace Ms
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#endif
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