juce_UndoableAction.h

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/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.
 
   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3
 
   Details of these licenses can be found at: www.gnu.org/licenses
 
   JUCE 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 General Public License for more details.
 
   ------------------------------------------------------------------------------
 
   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.
 
  ==============================================================================
*/
 
#ifndef JUCE_UNDOABLEACTION_H_INCLUDED
#define JUCE_UNDOABLEACTION_H_INCLUDED
 
 
//==============================================================================
class JUCE_API  UndoableAction
{
protected:
    UndoableAction() noexcept   {}
 
public:
    virtual ~UndoableAction()   {}
 
    //==============================================================================
    virtual bool perform() = 0;
 
    virtual bool undo() = 0;
 
    //==============================================================================
    virtual int getSizeInUnits()    { return 10; }
 
    virtual UndoableAction* createCoalescedAction (UndoableAction* nextAction)  { (void) nextAction; return nullptr; }
};
 
 
#endif   // JUCE_UNDOABLEACTION_H_INCLUDED