third_party/blink/public/platform/mac/web_scrollbar_theme.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 *
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MAC_WEB_SCROLLBAR_THEME_H_
#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MAC_WEB_SCROLLBAR_THEME_H_

#include "third_party/blink/public/platform/web_common.h"
#include "third_party/blink/public/platform/web_scrollbar_buttons_placement.h"

namespace blink {

#if INSIDE_BLINK
class WebScrollbarThemeClient;
#endif

// This enum must match NSScrollerStyle in the 10.7 SDK.
enum ScrollerStyle { kScrollerStyleLegacy = 0, kScrollerStyleOverlay = 1 };

class WebScrollbarTheme {
 public:
  // Updates the scrollbar appearance and behavior.
  // |initialButtonDelay| is the current value of NSScrollerButtonDelay from
  // NSUserDefaults.
  // |autoscrollButtonDelay| is the current value of NSScrollerButtonPeriod from
  // NSUserDefaults.
  // |preferredScrollerStyle| is the current value of +[NSScroller
  // preferredScrollerStyle].
  // |redraw| is true if the update requires a redraw to include the change.
  // |jump_on_track_click| is the current value of AppleScrollerPagingBehavior.
  BLINK_EXPORT static void UpdateScrollbarsWithNSDefaults(
      float initial_button_delay,
      float autoscroll_button_delay,
      ScrollerStyle preferred_scroller_style,
      bool redraw,
      bool jump_on_track_click);

  static float InitialButtonDelay();
  static float AutoscrollButtonDelay();
  static ScrollerStyle PreferredScrollerStyle();
  static bool JumpOnTrackClick();

// Registered clients will receive a callback whenever
// UpdateScrollbarsWithNSDefaults is called.
#if INSIDE_BLINK
  static void RegisterClient(WebScrollbarThemeClient& client);
  static void UnregisterClient(WebScrollbarThemeClient& client);
#endif
};

}  // namespace blink

#endif