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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis (at) kde.org>
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  */
     20 
     21 #ifndef SVGLength_h
     22 #define SVGLength_h
     23 
     24 #include "bindings/v8/ExceptionMessages.h"
     25 #include "bindings/v8/ExceptionStatePlaceholder.h"
     26 #include "core/svg/SVGLengthContext.h"
     27 #include "core/svg/properties/SVGProperty.h"
     28 #include "platform/heap/Handle.h"
     29 
     30 namespace WebCore {
     31 
     32 class CSSPrimitiveValue;
     33 class ExceptionState;
     34 class QualifiedName;
     35 
     36 enum SVGLengthNegativeValuesMode {
     37     AllowNegativeLengths,
     38     ForbidNegativeLengths
     39 };
     40 
     41 class SVGLengthTearOff;
     42 
     43 class SVGLength FINAL : public SVGPropertyBase {
     44 public:
     45     typedef SVGLengthTearOff TearOffType;
     46 
     47     static PassRefPtr<SVGLength> create(SVGLengthMode mode = LengthModeOther)
     48     {
     49         return adoptRef(new SVGLength(mode));
     50     }
     51 
     52     PassRefPtr<SVGLength> clone() const;
     53     virtual PassRefPtr<SVGPropertyBase> cloneForAnimation(const String&) const OVERRIDE;
     54 
     55     SVGLengthType unitType() const { return static_cast<SVGLengthType>(m_unitType); }
     56     void setUnitType(SVGLengthType);
     57     SVGLengthMode unitMode() const { return static_cast<SVGLengthMode>(m_unitMode); }
     58 
     59     bool operator==(const SVGLength&) const;
     60     bool operator!=(const SVGLength& other) const { return !operator==(other); }
     61 
     62     float value(const SVGLengthContext& context) const
     63     {
     64         return value(context, IGNORE_EXCEPTION);
     65     }
     66     float value(const SVGLengthContext&, ExceptionState&) const;
     67     void setValue(float, const SVGLengthContext&, ExceptionState&);
     68 
     69     float valueInSpecifiedUnits() const { return m_valueInSpecifiedUnits; }
     70     void setValueInSpecifiedUnits(float value) { m_valueInSpecifiedUnits = value; }
     71 
     72     float valueAsPercentage() const;
     73 
     74     virtual String valueAsString() const OVERRIDE;
     75     void setValueAsString(const String&, ExceptionState&);
     76 
     77     void newValueSpecifiedUnits(SVGLengthType, float valueInSpecifiedUnits);
     78     void convertToSpecifiedUnits(SVGLengthType, const SVGLengthContext&, ExceptionState&);
     79 
     80     // Helper functions
     81     inline bool isRelative() const
     82     {
     83         return m_unitType == LengthTypePercentage
     84             || m_unitType == LengthTypeEMS
     85             || m_unitType == LengthTypeEXS;
     86     }
     87 
     88     bool isZero() const
     89     {
     90         return !m_valueInSpecifiedUnits;
     91     }
     92 
     93     static PassRefPtr<SVGLength> fromCSSPrimitiveValue(CSSPrimitiveValue*);
     94     static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> toCSSPrimitiveValue(PassRefPtr<SVGLength>);
     95     static SVGLengthMode lengthModeForAnimatedLengthAttribute(const QualifiedName&);
     96 
     97     PassRefPtr<SVGLength> blend(PassRefPtr<SVGLength> from, float progress) const;
     98 
     99     virtual void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) OVERRIDE;
    100     virtual void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtr<SVGPropertyBase> from, PassRefPtr<SVGPropertyBase> to, PassRefPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement* contextElement) OVERRIDE;
    101     virtual float calculateDistance(PassRefPtr<SVGPropertyBase> to, SVGElement* contextElement) OVERRIDE;
    102 
    103     static AnimatedPropertyType classType() { return AnimatedLength; }
    104 
    105 private:
    106     SVGLength(SVGLengthMode);
    107     SVGLength(const SVGLength&);
    108 
    109     float m_valueInSpecifiedUnits;
    110     unsigned m_unitMode : 2;
    111     unsigned m_unitType : 4;
    112 };
    113 
    114 inline PassRefPtr<SVGLength> toSVGLength(PassRefPtr<SVGPropertyBase> passBase)
    115 {
    116     RefPtr<SVGPropertyBase> base = passBase;
    117     ASSERT(base->type() == SVGLength::classType());
    118     return static_pointer_cast<SVGLength>(base.release());
    119 }
    120 
    121 } // namespace WebCore
    122 
    123 #endif // SVGLength_h
    124