chromium/src/third_party/blink/renderer/core/scroll/scrollbar_theme_overlay.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 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
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SCROLLBAR_THEME_OVERLAY_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SCROLLBAR_THEME_OVERLAY_H_

#include "third_party/blink/renderer/core/scroll/scrollbar_theme.h"

namespace blink {

// This scrollbar theme is used to get overlay scrollbar for platforms other
// than Mac. Mac's overlay scrollbars are in ScrollbarThemeMac*.
class CORE_EXPORT ScrollbarThemeOverlay : public ScrollbarTheme {
 public:
  static ScrollbarThemeOverlay& GetInstance();

  ~ScrollbarThemeOverlay() override = default;

  bool ShouldRepaintAllPartsOnInvalidation() const override;

  ScrollbarPart PartsToInvalidateOnThumbPositionChange(
      const Scrollbar&,
      float old_position,
      float new_position) const override;

  int ScrollbarThickness(float scale_from_dip) override;
  int ScrollbarMargin(float scale_from_dip) const override;
  bool UsesOverlayScrollbars() const override;
  base::TimeDelta OverlayScrollbarFadeOutDelay() const override;
  base::TimeDelta OverlayScrollbarFadeOutDuration() const override;

  int ThumbLength(const Scrollbar&) override;
  int ThumbThickness(float scale_from_dip) const {
    return thumb_thickness_dip_ * scale_from_dip;
  }

  bool NativeThemeHasButtons() override { return false; }
  bool HasThumb(const Scrollbar&) override;

  IntRect BackButtonRect(const Scrollbar&) override;
  IntRect ForwardButtonRect(const Scrollbar&) override;
  IntRect TrackRect(const Scrollbar&) override;
  IntRect ThumbRect(const Scrollbar&) override;

  void PaintThumb(GraphicsContext&, const Scrollbar&, const IntRect&) override;

  bool UsesNinePatchThumbResource() const override;
  IntSize NinePatchThumbCanvasSize(const Scrollbar&) const override;
  IntRect NinePatchThumbAperture(const Scrollbar&) const override;

  int MinimumThumbLength(const Scrollbar&) override;

 protected:
  FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeOverlayTest, PaintInvalidation);

  ScrollbarThemeOverlay(int thumb_thickness_dip, int scrollbar_margin_dip);

  ScrollbarPart HitTest(const Scrollbar&, const IntPoint&) override;

 private:
  int thumb_thickness_dip_;
  int scrollbar_margin_dip_;
};

}  // namespace blink

#endif