Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

Source/core/rendering/style/StyleNavigationData.h

+/*
+ * Copyright (C) 2011 Kyounga Ra (kyounga.ra@gmail.com)
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef StyleNavigationData_h
+#define StyleNavigationData_h
+
+#include "StyleNavigationValue.h"
+
+namespace WebCore {
+
+class StyleNavigationData {
+friend class RenderStyle;
+public:
+    StyleNavigationData() { }
+
+    StyleNavigationData(const StyleNavigationData& o)
+    : m_up(o.m_up)
+    , m_down(o.m_down)
+    , m_left(o.m_left)
+    , m_right(o.m_right)
+    { }
+
+    bool operator==(const StyleNavigationData& o) const
+    {
+        return m_up == o.m_up && m_down == o.m_down && m_left == o.m_left && m_right == o.m_right;
+    }
+
+    bool operator!=(const StyleNavigationData& o) const
+    {
+        return !(*this == o);
+    }
+
+    const StyleNavigationValue& up() const { return m_up; }
+    const StyleNavigationValue& down() const { return m_down; }
+    const StyleNavigationValue& left() const { return m_left; }
+    const StyleNavigationValue& right() const { return m_right; }
+
+private:
+    StyleNavigationValue m_up;
+    StyleNavigationValue m_down;
+    StyleNavigationValue m_left;
+    StyleNavigationValue m_right;
+};
+
+} // namespace WebCore
+
+#endif // StyleNavigationData_h