[WIP] Refactor DocumentMarker

third_party/WebKit/Source/core/editing/markers/CompositionMarker.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CompositionMarker_h
+#define CompositionMarker_h
+
+#include "core/editing/markers/DocumentMarker.h"
+
+namespace blink {
+
+class CORE_EXPORT CompositionMarker final : public DocumentMarker {
+ public:
+  CompositionMarker(unsigned startOffset,
+                    unsigned endOffset,
+                    Color underlineColor,
+                    bool thick,
+                    Color backgroundColor);
+
+  // DocumentMarker implementations
+  CompositionMarker* clone() const final;
+
+  MarkerType type() const final;
+
+  Color underlineColor() const final;
+  bool thick() const final;
+  Color backgroundColor() const final;
+
+ protected:
+  CompositionMarker(const CompositionMarker&) = default;
+
+ private:
+  Color m_underlineColor;
+  bool m_thick;
+  Color m_backgroundColor;
+};
+
+DEFINE_TYPE_CASTS(CompositionMarker,
+                  DocumentMarker,
+                  marker,
+                  marker->type() == DocumentMarker::Composition,
+                  marker.type() == DocumentMarker::Composition);
+
+}  // namespace blink
+
+#endif  // CompositionMarker_h