third_party/WebKit/Source/core/svg/SVGZoomAndPan.h

   1 /*
   2  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
   3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
   4  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this library; see the file COPYING.LIB.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  */
  21
  22 #ifndef SVGZoomAndPan_h
  23 #define SVGZoomAndPan_h
  24
  25 #include "core/SVGNames.h"
  26 #include "core/dom/QualifiedName.h"
  27 #include "wtf/HashSet.h"
  28
  29 namespace blink {
  30
  31 class ExceptionState;
  32
  33 enum SVGZoomAndPanType {
  34     SVGZoomAndPanUnknown = 0,
  35     SVGZoomAndPanDisable,
  36     SVGZoomAndPanMagnify
  37 };
  38
  39 class SVGZoomAndPan {
  40 public:
  41     // Forward declare enumerations in the W3C naming scheme, for IDL generation.
  42     enum {
  43         SVG_ZOOMANDPAN_UNKNOWN = SVGZoomAndPanUnknown,
  44         SVG_ZOOMANDPAN_DISABLE = SVGZoomAndPanDisable,
  45         SVG_ZOOMANDPAN_MAGNIFY = SVGZoomAndPanMagnify
  46     };
  47
  48     virtual ~SVGZoomAndPan() { }
  49
  50     static bool isKnownAttribute(const QualifiedName&);
  51     static void addSupportedAttributes(HashSet<QualifiedName>&);
  52
  53     static SVGZoomAndPanType parseFromNumber(unsigned short number)
  54     {
  55         if (!number || number > SVGZoomAndPanMagnify)
  56             return SVGZoomAndPanUnknown;
  57         return static_cast<SVGZoomAndPanType>(number);
  58     }
  59
  60     bool parseZoomAndPan(const LChar*& start, const LChar* end);
  61     bool parseZoomAndPan(const UChar*& start, const UChar* end);
  62
  63     bool parseAttribute(const QualifiedName& name, const AtomicString& value)
  64     {
  65         if (name == SVGNames::zoomAndPanAttr) {
  66             m_zoomAndPan = SVGZoomAndPanUnknown;
  67             if (!value.isEmpty()) {
  68                 if (value.is8Bit()) {
  69                     const LChar* start = value.characters8();
  70                     parseZoomAndPan(start, start + value.length());
  71                 } else {
  72                     const UChar* start = value.characters16();
  73                     parseZoomAndPan(start, start + value.length());
  74                 }
  75             }
  76             return true;
  77         }
  78
  79         return false;
  80     }
  81
  82     // JS API
  83     SVGZoomAndPanType zoomAndPan() const { return m_zoomAndPan; }
  84     virtual void setZoomAndPan(unsigned short value) { m_zoomAndPan = parseFromNumber(value); }
  85     virtual void setZoomAndPan(unsigned short value, ExceptionState&) { setZoomAndPan(value); }
  86
  87 protected:
  88     SVGZoomAndPan();
  89     void resetZoomAndPan();
  90
  91 private:
  92     SVGZoomAndPanType m_zoomAndPan;
  93 };
  94
  95 } // namespace blink
  96
  97 #endif // SVGZoomAndPan_h