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/*
* 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/Forward.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class HTMLInputElement;
class StepRange {
WTF_MAKE_NONCOPYABLE(StepRange);
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