third_party/WebKit/Source/core/style/BorderValue.h

   1 /*
   2  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   3  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
   4  *           (C) 2000 Dirk Mueller (mueller@kde.org)
   5  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   6  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public License
  19  * along with this library; see the file COPYING.LIB.  If not, write to
  20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21  * Boston, MA 02110-1301, USA.
  22  *
  23  */
  24
  25 #ifndef BorderValue_h
  26 #define BorderValue_h
  27
  28 #include "core/css/StyleColor.h"
  29 #include "core/style/ComputedStyleConstants.h"
  30 #include "platform/graphics/Color.h"
  31 #include "wtf/Allocator.h"
  32
  33 namespace blink {
  34
  35 class BorderValue {
  36     DISALLOW_ALLOCATION();
  37 friend class ComputedStyle;
  38 public:
  39     BorderValue()
  40         : m_color(0)
  41         , m_colorIsCurrentColor(true)
  42         , m_width(3)
  43         , m_style(BNONE)
  44         , m_isAuto(AUTO_OFF)
  45     {
  46     }
  47
  48     bool nonZero(bool checkStyle = true) const
  49     {
  50         return width() && (!checkStyle || m_style != BNONE);
  51     }
  52
  53     bool isTransparent() const
  54     {
  55         return !m_colorIsCurrentColor && !m_color.alpha();
  56     }
  57
  58     bool isVisible(bool checkStyle = true) const
  59     {
  60         return nonZero(checkStyle) && !isTransparent() && (!checkStyle || m_style != BHIDDEN);
  61     }
  62
  63     bool operator==(const BorderValue& o) const
  64     {
  65         return m_width == o.m_width && m_style == o.m_style && m_color == o.m_color && m_colorIsCurrentColor == o.m_colorIsCurrentColor;
  66     }
  67
  68     // The default width is 3px, but if the style is none we compute a value of 0 (in ComputedStyle itself)
  69     bool visuallyEqual(const BorderValue& o) const
  70     {
  71         if (m_style == BNONE && o.m_style == BNONE)
  72             return true;
  73         if (m_style == BHIDDEN && o.m_style == BHIDDEN)
  74             return true;
  75         return *this == o;
  76     }
  77
  78     bool operator!=(const BorderValue& o) const
  79     {
  80         return !(*this == o);
  81     }
  82
  83     void setColor(const StyleColor& color)
  84     {
  85         m_color = color.resolve(Color());
  86         m_colorIsCurrentColor = color.isCurrentColor();
  87     }
  88
  89     StyleColor color() const { return m_colorIsCurrentColor ? StyleColor::currentColor() : StyleColor(m_color); }
  90
  91     int width() const { return m_width; }
  92
  93     EBorderStyle style() const { return static_cast<EBorderStyle>(m_style); }
  94     void setStyle(EBorderStyle style) { m_style = style; }
  95
  96 protected:
  97     Color m_color;
  98     unsigned m_colorIsCurrentColor : 1;
  99
 100     unsigned m_width : 26;
 101     unsigned m_style : 4; // EBorderStyle
 102
 103     // This is only used by OutlineValue but moved here to keep the bits packed.
 104     unsigned m_isAuto : 1; // OutlineIsAuto
 105 };
 106
 107 } // namespace blink
 108
 109 #endif // BorderValue_h