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      1 /*
      2  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2008 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 SVGTextContentElement_h
     22 #define SVGTextContentElement_h
     23 
     24 #include "core/svg/SVGAnimatedBoolean.h"
     25 #include "core/svg/SVGAnimatedEnumeration.h"
     26 #include "core/svg/SVGAnimatedLength.h"
     27 #include "core/svg/SVGExternalResourcesRequired.h"
     28 #include "core/svg/SVGGraphicsElement.h"
     29 
     30 namespace WebCore {
     31 
     32 class ExceptionState;
     33 
     34 enum SVGLengthAdjustType {
     35     SVGLengthAdjustUnknown,
     36     SVGLengthAdjustSpacing,
     37     SVGLengthAdjustSpacingAndGlyphs
     38 };
     39 
     40 template<>
     41 struct SVGPropertyTraits<SVGLengthAdjustType> {
     42     static unsigned highestEnumValue() { return SVGLengthAdjustSpacingAndGlyphs; }
     43 
     44     static String toString(SVGLengthAdjustType type)
     45     {
     46         switch (type) {
     47         case SVGLengthAdjustUnknown:
     48             return emptyString();
     49         case SVGLengthAdjustSpacing:
     50             return "spacing";
     51         case SVGLengthAdjustSpacingAndGlyphs:
     52             return "spacingAndGlyphs";
     53         }
     54 
     55         ASSERT_NOT_REACHED();
     56         return emptyString();
     57     }
     58 
     59     static SVGLengthAdjustType fromString(const String& value)
     60     {
     61         if (value == "spacingAndGlyphs")
     62             return SVGLengthAdjustSpacingAndGlyphs;
     63         if (value == "spacing")
     64             return SVGLengthAdjustSpacing;
     65         return SVGLengthAdjustUnknown;
     66     }
     67 };
     68 
     69 class SVGTextContentElement : public SVGGraphicsElement,
     70                               public SVGExternalResourcesRequired {
     71 public:
     72     // Forward declare enumerations in the W3C naming scheme, for IDL generation.
     73     enum {
     74         LENGTHADJUST_UNKNOWN = SVGLengthAdjustUnknown,
     75         LENGTHADJUST_SPACING = SVGLengthAdjustSpacing,
     76         LENGTHADJUST_SPACINGANDGLYPHS = SVGLengthAdjustSpacingAndGlyphs
     77     };
     78 
     79     unsigned getNumberOfChars();
     80     float getComputedTextLength();
     81     float getSubStringLength(unsigned charnum, unsigned nchars, ExceptionState&);
     82     SVGPoint getStartPositionOfChar(unsigned charnum, ExceptionState&);
     83     SVGPoint getEndPositionOfChar(unsigned charnum, ExceptionState&);
     84     SVGRect getExtentOfChar(unsigned charnum, ExceptionState&);
     85     float getRotationOfChar(unsigned charnum, ExceptionState&);
     86     int getCharNumAtPosition(const SVGPoint&);
     87     void selectSubString(unsigned charnum, unsigned nchars, ExceptionState&);
     88 
     89     static SVGTextContentElement* elementFromRenderer(RenderObject*);
     90 
     91     // textLength is not declared using the standard DECLARE_ANIMATED_LENGTH macro
     92     // as its getter needs special handling (return getComputedTextLength(), instead of m_textLength).
     93     SVGLength& specifiedTextLength() { return m_specifiedTextLength; }
     94     PassRefPtr<SVGAnimatedLength> textLength();
     95     static const SVGPropertyInfo* textLengthPropertyInfo();
     96 
     97 protected:
     98     SVGTextContentElement(const QualifiedName&, Document*);
     99 
    100     virtual bool isValid() const { return SVGTests::isValid(); }
    101 
    102     bool isSupportedAttribute(const QualifiedName&);
    103     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
    104     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
    105     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, MutableStylePropertySet*) OVERRIDE;
    106     virtual void svgAttributeChanged(const QualifiedName&);
    107 
    108     virtual bool selfHasRelativeLengths() const;
    109 
    110 private:
    111     virtual bool isTextContent() const { return true; }
    112 
    113     // Custom 'textLength' property
    114     static void synchronizeTextLength(SVGElement* contextElement);
    115     static PassRefPtr<SVGAnimatedProperty> lookupOrCreateTextLengthWrapper(SVGElement* contextElement);
    116     mutable SVGSynchronizableAnimatedProperty<SVGLength> m_textLength;
    117     SVGLength m_specifiedTextLength;
    118 
    119     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGTextContentElement)
    120         DECLARE_ANIMATED_ENUMERATION(LengthAdjust, lengthAdjust, SVGLengthAdjustType)
    121         DECLARE_ANIMATED_BOOLEAN(ExternalResourcesRequired, externalResourcesRequired)
    122     END_DECLARE_ANIMATED_PROPERTIES
    123 };
    124 
    125 inline SVGTextContentElement* toSVGTextContentElement(SVGElement* element)
    126 {
    127     ASSERT_WITH_SECURITY_IMPLICATION(!element || element->isTextContent());
    128     return static_cast<SVGTextContentElement*>(element);
    129 }
    130 
    131 } // namespace WebCore
    132 
    133 #endif
    134