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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
*
* 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 TimingFunction_h
#define TimingFunction_h
#include <wtf/RefCounted.h>
namespace WebCore {
class TimingFunction : public RefCounted<TimingFunction> {
public:
enum TimingFunctionType {
LinearFunction, CubicBezierFunction, StepsFunction
};
virtual ~TimingFunction() { }
TimingFunctionType type() const { return m_type; }
bool isLinearTimingFunction() const { return m_type == LinearFunction; }
bool isCubicBezierTimingFunction() const { return m_type == CubicBezierFunction; }
bool isStepsTimingFunction() const { return m_type == StepsFunction; }
virtual bool operator==(const TimingFunction& other) = 0;
protected:
TimingFunction(TimingFunctionType type)
: m_type(type)
{
}
TimingFunctionType m_type;
};
class LinearTimingFunction : public TimingFunction {
public:
static PassRefPtr<LinearTimingFunction> create()
{
return adoptRef(new LinearTimingFunction);
}
~LinearTimingFunction() { }
virtual bool operator==(const TimingFunction& other)
{
return other.isLinearTimingFunction();
}
private:
LinearTimingFunction()
: TimingFunction(LinearFunction)
{
}
};
class CubicBezierTimingFunction : public TimingFunction {
public:
enum TimingFunctionPreset {
Ease,
EaseIn,
EaseOut,
EaseInOut,
Custom
};
static PassRefPtr<CubicBezierTimingFunction> create(double x1, double y1, double x2, double y2)
{
return adoptRef(new CubicBezierTimingFunction(Custom, x1, y1, x2, y2));
}
static PassRefPtr<CubicBezierTimingFunction> create()
{
return adoptRef(new CubicBezierTimingFunction());
}
static PassRefPtr<CubicBezierTimingFunction> create(TimingFunctionPreset preset)
{
switch (preset) {
case Ease:
return adoptRef(new CubicBezierTimingFunction());
case EaseIn:
return adoptRef(new CubicBezierTimingFunction(EaseIn, 0.42, 0.0, 1.0, 1.0));
case EaseOut:
return adoptRef(new CubicBezierTimingFunction(EaseOut, 0.0, 0.0, 0.58, 1.0));
case EaseInOut:
return adoptRef(new CubicBezierTimingFunction(EaseInOut, 0.42, 0.0, 0.58, 1.0));
default:
ASSERT_NOT_REACHED();
return 0;
}
}
~CubicBezierTimingFunction() { }
virtual bool operator==(const TimingFunction& other)
{
if (other.isCubicBezierTimingFunction()) {
const CubicBezierTimingFunction* ctf = static_cast<const CubicBezierTimingFunction*>(&other);
if (m_timingFunctionPreset != Custom)
return m_timingFunctionPreset == ctf->m_timingFunctionPreset;
return m_x1 == ctf->m_x1 && m_y1 == ctf->m_y1 && m_x2 == ctf->m_x2 && m_y2 == ctf->m_y2;
}
return false;
}
double x1() const { return m_x1; }
double y1() const { return m_y1; }
double x2() const { return m_x2; }
double y2() const { return m_y2; }
TimingFunctionPreset timingFunctionPreset() const { return m_timingFunctionPreset; }
static const CubicBezierTimingFunction* defaultTimingFunction()
{
static const CubicBezierTimingFunction* dtf = create().leakRef();
return dtf;
}
private:
explicit CubicBezierTimingFunction(TimingFunctionPreset preset = Ease, double x1 = 0.25, double y1 = 0.1, double x2 = 0.25, double y2 = 1.0)
: TimingFunction(CubicBezierFunction)
, m_x1(x1)
, m_y1(y1)
, m_x2(x2)
, m_y2(y2)
, m_timingFunctionPreset(preset)
{
}
double m_x1;
double m_y1;
double m_x2;
double m_y2;
TimingFunctionPreset m_timingFunctionPreset;
};
class StepsTimingFunction : public TimingFunction {
public:
static PassRefPtr<StepsTimingFunction> create(int steps, bool stepAtStart)
{
return adoptRef(new StepsTimingFunction(steps, stepAtStart));
}
~StepsTimingFunction() { }
virtual bool operator==(const TimingFunction& other)
{
if (other.isStepsTimingFunction()) {
const StepsTimingFunction* stf = static_cast<const StepsTimingFunction*>(&other);
return m_steps == stf->m_steps && m_stepAtStart == stf->m_stepAtStart;
}
return false;
}
int numberOfSteps() const { return m_steps; }
bool stepAtStart() const { return m_stepAtStart; }
private:
StepsTimingFunction(int steps, bool stepAtStart)
: TimingFunction(StepsFunction)
, m_steps(steps)
, m_stepAtStart(stepAtStart)
{
}
int m_steps;
bool m_stepAtStart;
};
} // namespace WebCore
#endif // TimingFunction_h
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