/*

 * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 *

 */

#ifndef StepRange_h

#define StepRange_h

#include <wtf/Noncopyable.h>

namespace WebCore {

class HTMLInputElement;

class String;

class StepRange : public Noncopyable {

public:

    bool hasStep;

    double step;

    double minimum;

    double maximum; // maximum must be >= minimum.

    explicit StepRange(const HTMLInputElement*);

    double clampValue(double value);

    double clampValue(const String& stringValue);

    // Clamp the middle value according to the step

    double defaultValue()

    {

        return clampValue((minimum + maximum) / 2);

    }

    // Map value into 0-1 range

    double proportionFromValue(double value)

    {

        if (minimum == maximum)

            return 0;

        return (value - minimum) / (maximum - minimum);

    }

    // Map from 0-1 range to value

    double valueFromProportion(double proportion)

    {

        return minimum + proportion * (maximum - minimum);

    }

    double valueFromElement(HTMLInputElement*, bool* wasClamped = 0);

};

}

#endif // StepRange_h