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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef AnimatableLength_h
#define AnimatableLength_h
#include "core/animation/AnimatableValue.h"
#include "core/css/CSSCalculationValue.h"
#include "core/css/CSSPrimitiveValue.h"
#include "platform/Length.h"
namespace WebCore {
enum NumberRange {
AllValues,
NonNegativeValues,
};
// Handles animation of CSS length and percentage values including CSS calc.
// See primitiveUnitToNumberType() for the list of supported units.
// If created from a CSSPrimitiveValue this class will cache it to be returned in toCSSValue().
class AnimatableLength : public AnimatableValue {
public:
enum NumberUnitType {
UnitTypeCalc,
UnitTypePixels,
UnitTypePercentage,
UnitTypeFontSize,
UnitTypeFontXSize,
UnitTypeRootFontSize,
UnitTypeViewportWidth,
UnitTypeViewportHeight,
UnitTypeViewportMin,
UnitTypeViewportMax,
};
virtual ~AnimatableLength() { }
static bool canCreateFrom(const CSSValue*);
static PassRefPtr<AnimatableLength> create(CSSValue*);
static PassRefPtr<AnimatableLength> create(double number, NumberUnitType unitType, CSSPrimitiveValue* cssPrimitiveValue = 0)
{
return adoptRef(new AnimatableLength(number, unitType, cssPrimitiveValue));
}
static PassRefPtr<AnimatableLength> create(PassRefPtr<CSSCalcExpressionNode> calcExpression, CSSPrimitiveValue* cssPrimitiveValue = 0)
{
return adoptRef(new AnimatableLength(calcExpression, cssPrimitiveValue));
}
PassRefPtr<CSSValue> toCSSValue(NumberRange = AllValues) const;
Length toLength(const CSSToLengthConversionData&, NumberRange = AllValues) const;
protected:
virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;
private:
AnimatableLength(double number, NumberUnitType unitType, CSSPrimitiveValue* cssPrimitiveValue)
: m_number(number)
, m_unitType(unitType)
, m_cachedCSSPrimitiveValue(cssPrimitiveValue)
{
ASSERT(m_unitType != UnitTypeCalc);
}
AnimatableLength(PassRefPtr<CSSCalcExpressionNode> calcExpression, CSSPrimitiveValue* cssPrimitiveValue)
: m_unitType(UnitTypeCalc)
, m_calcExpression(calcExpression)
, m_cachedCSSPrimitiveValue(cssPrimitiveValue)
{
ASSERT(m_calcExpression);
}
virtual AnimatableType type() const OVERRIDE { return TypeLength; }
virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
bool isCalc() const
{
return m_unitType == UnitTypeCalc;
}
bool isViewportUnit() const
{
return m_unitType == UnitTypeViewportWidth || m_unitType == UnitTypeViewportHeight || m_unitType == UnitTypeViewportMin || m_unitType == UnitTypeViewportMax;
}
static PassRefPtr<AnimatableLength> create(const AnimatableLength* leftAddend, const AnimatableLength* rightAddend)
{
ASSERT(leftAddend && rightAddend);
return create(CSSCalcValue::createExpressionNode(leftAddend->toCSSCalcExpressionNode(), rightAddend->toCSSCalcExpressionNode(), CalcAdd));
}
PassRefPtr<CSSPrimitiveValue> toCSSPrimitiveValue(NumberRange) const;
PassRefPtr<CSSCalcExpressionNode> toCSSCalcExpressionNode() const;
PassRefPtr<AnimatableLength> scale(double) const;
double clampedNumber(NumberRange range) const
{
ASSERT(!isCalc());
return (range == NonNegativeValues && m_number <= 0) ? 0 : m_number;
}
// Returns true and populates numberType, if primitiveUnit is a primitive length unit. Otherwise, returns false.
static bool primitiveUnitToNumberType(unsigned short primitiveUnit, NumberUnitType& numberType);
static unsigned short numberTypeToPrimitiveUnit(NumberUnitType numberType);
// Zero is effectively unitless, except in the case of percentage.
// http://www.w3.org/TR/css3-values/#calc-computed-value
// e.g. calc(100% - 100% + 1em) resolves to calc(0% + 1em), not to calc(1em)
bool isUnitlessZero() const
{
return !isCalc() && !m_number && m_unitType != UnitTypePercentage;
}
NumberUnitType commonUnitType(const AnimatableLength* length) const
{
if (m_unitType == length->m_unitType)
return m_unitType;
if (isUnitlessZero())
return length->m_unitType;
if (length->isUnitlessZero())
return m_unitType;
return UnitTypeCalc;
}
double m_number;
const NumberUnitType m_unitType;
RefPtr<CSSCalcExpressionNode> m_calcExpression;
mutable RefPtr<CSSPrimitiveValue> m_cachedCSSPrimitiveValue;
friend class AnimationAnimatableLengthTest;
};
DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLength, isLength());
} // namespace WebCore
#endif // AnimatableLength_h
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