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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 mozilla_widget_ScrollbarDrawing_h
#define mozilla_widget_ScrollbarDrawing_h
#include "nsColor.h"
#include "nsITheme.h"
#include "Units.h"
#include "mozilla/Array.h"
namespace mozilla {
namespace gfx {
class DrawTarget;
namespace widget {
struct ScrollbarParams {
bool overlay = false;
bool rolledOver = false;
bool small = false;
bool horizontal = false;
bool rtl = false;
bool onDarkBackground = false;
bool custom = false;
// Two colors only used when custom is true.
nscolor trackColor = NS_RGBA(0, 0, 0, 0);
nscolor faceColor = NS_RGBA(0, 0, 0, 0);
class ScrollbarDrawingMac final {
struct FillRect {
gfx::Rect mRect;
nscolor mColor;
static CSSIntCoord GetScrollbarSize(StyleScrollbarWidth, bool aOverlay);
static LayoutDeviceIntCoord GetScrollbarSize(StyleScrollbarWidth,
bool aOverlay, float aDpiRatio);
static LayoutDeviceIntSize GetMinimumWidgetSize(StyleAppearance aAppearance,
nsIFrame* aFrame,
float aDpiRatio);
static ScrollbarParams ComputeScrollbarParams(nsIFrame* aFrame,
const ComputedStyle& aStyle,
bool aIsHorizontal);
// The caller can draw this rectangle with rounded corners as appropriate.
struct ThumbRect {
gfx::Rect mRect;
nscolor mFillColor;
nscolor mStrokeColor;
float mStrokeWidth;
float mStrokeOutset;
static ThumbRect GetThumbRect(const gfx::Rect& aRect,
const ScrollbarParams& aParams, float aScale);
using ScrollbarTrackRects = Array<FillRect, 4>;
static bool GetScrollbarTrackRects(const gfx::Rect& aRect,
const ScrollbarParams& aParams,
float aScale, ScrollbarTrackRects&);
using ScrollCornerRects = Array<FillRect, 7>;
static bool GetScrollCornerRects(const gfx::Rect& aRect,
const ScrollbarParams& aParams, float aScale,
} // namespace widget
} // namespace mozilla