third_party/WebKit/Source/platform/exported/WebScrollbarThemeGeometryNative.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1.  Redistributions of source code must retain the above copyright
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 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#ifndef WebScrollbarThemeGeometryNative_h
#define WebScrollbarThemeGeometryNative_h

#include <memory>
#include "platform/PlatformExport.h"
#include "platform/wtf/Allocator.h"
#include "platform/wtf/Noncopyable.h"
#include "public/platform/WebRect.h"
#include "public/platform/WebScrollbarThemeGeometry.h"

namespace blink {

class ScrollbarTheme;
class WebScrollbar;

class PLATFORM_EXPORT WebScrollbarThemeGeometryNative
    : public WebScrollbarThemeGeometry {
  USING_FAST_MALLOC(WebScrollbarThemeGeometryNative);
  WTF_MAKE_NONCOPYABLE(WebScrollbarThemeGeometryNative);

 public:
  static std::unique_ptr<WebScrollbarThemeGeometryNative> Create(
      ScrollbarTheme&);

  bool HasButtons(WebScrollbar*) override;
  bool HasThumb(WebScrollbar*) override;
  WebRect TrackRect(WebScrollbar*) override;
  WebRect ThumbRect(WebScrollbar*) override;
  WebRect BackButtonStartRect(WebScrollbar*) override;
  WebRect BackButtonEndRect(WebScrollbar*) override;
  WebRect ForwardButtonStartRect(WebScrollbar*) override;
  WebRect ForwardButtonEndRect(WebScrollbar*) override;
  WebSize NinePatchThumbCanvasSize(WebScrollbar*) override;
  WebRect NinePatchThumbAperture(WebScrollbar*) override;

 private:
  explicit WebScrollbarThemeGeometryNative(ScrollbarTheme&);

  // The theme is not owned by this class. It is assumed that the theme is a
  // static pointer and its lifetime is essentially infinite. Only thread-safe
  // functions on the theme can be called by this theme.
  ScrollbarTheme& theme_;
};

}  // namespace blink

#endif