text: /*
   * Copyright (C) 2008 Apple 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 INC. ``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 INC. OR
   * 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
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef ScrollbarThemeMac_h
  #define ScrollbarThemeMac_h
  
  #include "platform/mac/NSScrollerImpDetails.h"
  #include "platform/scroll/ScrollbarTheme.h"
  
  typedef id ScrollbarPainter;
  
  class SkCanvas;
  
  namespace blink {
  
  class Pattern;
  
  class PLATFORM_EXPORT ScrollbarThemeMac : public ScrollbarTheme {
   public:
    ~ScrollbarThemeMac() override;
  
    void registerScrollbar(ScrollbarThemeClient&) override;
    void unregisterScrollbar(ScrollbarThemeClient&) override;
    void preferencesChanged(float initialButtonDelay,
                            float autoscrollButtonDelay,
                            NSScrollerStyle preferredScrollerStyle,
                            bool redraw,
                            WebScrollbarButtonsPlacement);
  
    bool supportsControlTints() const override { return true; }
  
    double initialAutoscrollTimerDelay() override;
    double autoscrollTimerDelay() override;
  
    void paintTickmarks(GraphicsContext&,
                        const Scrollbar&,
                        const IntRect&) override;
  
    bool shouldRepaintAllPartsOnInvalidation() const override { return false; }
    ScrollbarPart invalidateOnThumbPositionChange(
        const ScrollbarThemeClient&,
        float oldPosition,
        float newPosition) const override;
    void updateEnabledState(const ScrollbarThemeClient&) override;
    int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) override;
    bool usesOverlayScrollbars() const override;
    void updateScrollbarOverlayColorTheme(const ScrollbarThemeClient&) override;
    WebScrollbarButtonsPlacement buttonsPlacement() const override;
  
    void setNewPainterForScrollbar(ScrollbarThemeClient&, ScrollbarPainter);
    ScrollbarPainter painterForScrollbar(const ScrollbarThemeClient&) const;
  
    void paintTrackBackground(GraphicsContext&,
                              const Scrollbar&,
                              const IntRect&) override;
    void paintThumb(GraphicsContext&, const Scrollbar&, const IntRect&) override;
  
    float thumbOpacity(const ScrollbarThemeClient&) const override;
  
    static NSScrollerStyle recommendedScrollerStyle();
  
   protected:
    int maxOverlapBetweenPages() override { return 40; }
  
    bool shouldDragDocumentInsteadOfThumb(const ScrollbarThemeClient&,
                                          const PlatformMouseEvent&) override;
    int scrollbarPartToHIPressedState(ScrollbarPart);
  
    virtual void updateButtonPlacement(WebScrollbarButtonsPlacement) {}
  
    IntRect trackRect(const ScrollbarThemeClient&,
                      bool painting = false) override;
    IntRect backButtonRect(const ScrollbarThemeClient&,
                           ScrollbarPart,
                           bool painting = false) override;
    IntRect forwardButtonRect(const ScrollbarThemeClient&,
                              ScrollbarPart,
                              bool painting = false) override;
  
    bool hasButtons(const ScrollbarThemeClient&) override { return false; }
    bool hasThumb(const ScrollbarThemeClient&) override;
  
    int minimumThumbLength(const ScrollbarThemeClient&) override;
  
    int tickmarkBorderWidth() override { return 1; }
  
    RefPtr<Pattern> m_overhangPattern;
  };
  }
  
  #endif  // ScrollbarThemeMac_h
  