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/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef ScrollbarUtil_h
#define ScrollbarUtil_h
#include "nsITheme.h"
#include "nsNativeTheme.h"
class ScrollbarUtil {
static bool IsScrollbarWidthThin(mozilla::ComputedStyle* aStyle);
static bool IsScrollbarWidthThin(nsIFrame* aFrame);
// Returns the style for custom scrollbar if the scrollbar part frame should
// use the custom drawing path, nullptr otherwise.
// Optionally the caller can pass a pointer to aDarkScrollbar for whether
// custom scrollbar may be drawn due to dark background.
static mozilla::ComputedStyle* GetCustomScrollbarStyle(
nsIFrame* aFrame, bool* aDarkScrollbar = nullptr);
static nscolor GetScrollbarTrackColor(nsIFrame* aFrame);
static nscolor GetScrollbarThumbColor(nsIFrame* aFrame,
mozilla::EventStates aEventStates);
static mozilla::Maybe<nsITheme::Transparency> GetScrollbarPartTransparency(
nsIFrame* aFrame, mozilla::StyleAppearance aAppearance);
ScrollbarUtil() = default;
virtual ~ScrollbarUtil() = default;