progress.h

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/*
    Copyright (C) 2010 Paul Davis

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __ardour_progress_h__
#define __ardour_progress_h__

#include <list>

#include "ardour/libardour_visibility.h"

namespace ARDOUR {

class LIBARDOUR_API Progress
{
public:
        Progress ();
        virtual ~Progress () {}
        void set_progress (float);

        void ascend ();
        void descend (float);

        bool cancelled () const;

protected:
        void cancel ();

private:
        virtual void set_overall_progress (float p) = 0;

        struct Level {
                Level (float a) : allocation (a), normalised (0) {}

                float allocation;
                float normalised;
        };

        std::list<Level> _stack;
        bool _cancelled;
};

}

#endif