widget/windows/ScrollbarUtil.h

   1 /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef ScrollbarUtil_h
   7 #define ScrollbarUtil_h
   8
   9 #include "nsITheme.h"
  10 #include "nsNativeTheme.h"
  11
  12 class ScrollbarUtil {
  13  public:
  14   static bool IsScrollbarWidthThin(mozilla::ComputedStyle* aStyle);
  15   static bool IsScrollbarWidthThin(nsIFrame* aFrame);
  16
  17   // Returns the style for custom scrollbar if the scrollbar part frame should
  18   // use the custom drawing path, nullptr otherwise.
  19   //
  20   // Optionally the caller can pass a pointer to aDarkScrollbar for whether
  21   // custom scrollbar may be drawn due to dark background.
  22   static mozilla::ComputedStyle* GetCustomScrollbarStyle(
  23       nsIFrame* aFrame, bool* aDarkScrollbar = nullptr);
  24
  25   static nscolor GetScrollbarButtonColor(nscolor aTrackColor,
  26                                          mozilla::EventStates aStates);
  27   static nscolor GetScrollbarArrowColor(nscolor aButtonColor);
  28   static nscolor GetScrollbarTrackColor(nsIFrame* aFrame);
  29   static nscolor GetScrollbarThumbColor(nsIFrame* aFrame,
  30                                         mozilla::EventStates aEventStates);
  31   static mozilla::Maybe<nsITheme::Transparency> GetScrollbarPartTransparency(
  32       nsIFrame* aFrame, mozilla::StyleAppearance aAppearance);
  33
  34  protected:
  35   ScrollbarUtil() = default;
  36   virtual ~ScrollbarUtil() = default;
  37 };
  38
  39 #endif