third_party/WebKit/Source/platform/LengthBox.cpp

   1 /*
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   4  * Redistribution and use in source and binary forms, with or without
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
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  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
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  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "platform/LengthBox.h"
  33
  34 namespace blink {
  35
  36 const Length& LengthBox::logicalLeft(WritingMode writingMode) const
  37 {
  38     return isHorizontalWritingMode(writingMode) ? m_left : m_top;
  39 }
  40
  41 const Length& LengthBox::logicalRight(WritingMode writingMode) const
  42 {
  43     return isHorizontalWritingMode(writingMode) ? m_right : m_bottom;
  44 }
  45
  46 const Length& LengthBox::before(WritingMode writingMode) const
  47 {
  48     switch (writingMode) {
  49     case TopToBottomWritingMode:
  50         return m_top;
  51     case BottomToTopWritingMode:
  52         return m_bottom;
  53     case LeftToRightWritingMode:
  54         return m_left;
  55     case RightToLeftWritingMode:
  56         return m_right;
  57     }
  58     ASSERT_NOT_REACHED();
  59     return m_top;
  60 }
  61
  62 const Length& LengthBox::after(WritingMode writingMode) const
  63 {
  64     switch (writingMode) {
  65     case TopToBottomWritingMode:
  66         return m_bottom;
  67     case BottomToTopWritingMode:
  68         return m_top;
  69     case LeftToRightWritingMode:
  70         return m_right;
  71     case RightToLeftWritingMode:
  72         return m_left;
  73     }
  74     ASSERT_NOT_REACHED();
  75     return m_bottom;
  76 }
  77
  78 const Length& LengthBox::start(WritingMode writingMode, TextDirection direction) const
  79 {
  80     if (isHorizontalWritingMode(writingMode))
  81         return isLeftToRightDirection(direction) ? m_left : m_right;
  82     return isLeftToRightDirection(direction) ? m_top : m_bottom;
  83 }
  84
  85 const Length& LengthBox::end(WritingMode writingMode, TextDirection direction) const
  86 {
  87     if (isHorizontalWritingMode(writingMode))
  88         return isLeftToRightDirection(direction) ? m_right : m_left;
  89     return isLeftToRightDirection(direction) ? m_bottom : m_top;
  90 }
  91
  92 } // namespace blink