/* | |
* 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 |