forked from mirrors/gecko-dev
364 lines
13 KiB
C++
364 lines
13 KiB
C++
/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 2; -*- */
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/* vim: set sw=2 ts=8 et tw=80 : */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ScrollbarDrawingMac.h"
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#include "mozilla/gfx/Helpers.h"
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#include "mozilla/RelativeLuminanceUtils.h"
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#include "nsLayoutUtils.h"
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#include "nsIFrame.h"
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#include "nsLookAndFeel.h"
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#include "nsContainerFrame.h"
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#include "nsNativeTheme.h"
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namespace mozilla {
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using namespace gfx;
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namespace widget {
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static nsIFrame* GetParentScrollbarFrame(nsIFrame* aFrame) {
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// Walk our parents to find a scrollbar frame
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nsIFrame* scrollbarFrame = aFrame;
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do {
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if (scrollbarFrame->IsScrollbarFrame()) {
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break;
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}
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} while ((scrollbarFrame = scrollbarFrame->GetParent()));
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// We return null if we can't find a parent scrollbar frame
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return scrollbarFrame;
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}
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static bool IsParentScrollbarRolledOver(nsIFrame* aFrame) {
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nsIFrame* scrollbarFrame = GetParentScrollbarFrame(aFrame);
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return nsLookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars) != 0
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? nsNativeTheme::CheckBooleanAttr(scrollbarFrame, nsGkAtoms::hover)
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: nsNativeTheme::GetContentState(scrollbarFrame,
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StyleAppearance::None)
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.HasState(NS_EVENT_STATE_HOVER);
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}
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CSSIntCoord ScrollbarDrawingMac::GetScrollbarSize(StyleScrollbarWidth aWidth,
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bool aOverlay) {
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bool isSmall = aWidth == StyleScrollbarWidth::Thin;
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if (aOverlay) {
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return isSmall ? 14 : 16;
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}
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return isSmall ? 11 : 15;
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}
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LayoutDeviceIntCoord ScrollbarDrawingMac::GetScrollbarSize(
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StyleScrollbarWidth aWidth, bool aOverlay, float aDpiRatio) {
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CSSIntCoord size = GetScrollbarSize(aWidth, aOverlay);
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if (aDpiRatio >= 2.0f) {
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return int32_t(size) * 2;
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}
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return int32_t(size);
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}
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LayoutDeviceIntSize ScrollbarDrawingMac::GetMinimumWidgetSize(
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StyleAppearance aAppearance, nsIFrame* aFrame, float aDpiRatio) {
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auto minSize = [&] {
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switch (aAppearance) {
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case StyleAppearance::ScrollbarthumbHorizontal:
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return IntSize{26, 0};
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case StyleAppearance::ScrollbarthumbVertical:
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return IntSize{0, 26};
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case StyleAppearance::ScrollbarVertical:
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case StyleAppearance::ScrollbarHorizontal:
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case StyleAppearance::ScrollbartrackVertical:
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case StyleAppearance::ScrollbartrackHorizontal: {
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ComputedStyle* style = nsLayoutUtils::StyleForScrollbar(aFrame);
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auto scrollbarWidth = style->StyleUIReset()->mScrollbarWidth;
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auto size = GetScrollbarSize(
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scrollbarWidth,
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LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars));
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return IntSize{size, size};
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}
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case StyleAppearance::MozMenulistArrowButton: {
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auto size =
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GetScrollbarSize(StyleScrollbarWidth::Auto, /* aOverlay = */ false);
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return IntSize{size, size};
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}
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case StyleAppearance::ScrollbarbuttonUp:
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case StyleAppearance::ScrollbarbuttonDown:
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return IntSize{15, 16};
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case StyleAppearance::ScrollbarbuttonLeft:
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case StyleAppearance::ScrollbarbuttonRight:
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return IntSize{16, 15};
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default:
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return IntSize{};
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}
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}();
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if (aDpiRatio >= 2.0f) {
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return LayoutDeviceIntSize{minSize.width * 2, minSize.height * 2};
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}
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return LayoutDeviceIntSize{minSize.width, minSize.height};
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}
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ScrollbarParams ScrollbarDrawingMac::ComputeScrollbarParams(
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nsIFrame* aFrame, const ComputedStyle& aStyle, bool aIsHorizontal) {
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ScrollbarParams params;
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params.overlay =
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nsLookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars) != 0;
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params.rolledOver = IsParentScrollbarRolledOver(aFrame);
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params.small =
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aStyle.StyleUIReset()->mScrollbarWidth == StyleScrollbarWidth::Thin;
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params.rtl = nsNativeTheme::IsFrameRTL(aFrame);
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params.horizontal = aIsHorizontal;
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params.onDarkBackground = !StaticPrefs::widget_disable_dark_scrollbar() &&
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nsNativeTheme::IsDarkBackground(aFrame);
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// Don't use custom scrollbars for overlay scrollbars since they are
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// generally good enough for use cases of custom scrollbars.
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if (!params.overlay) {
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const nsStyleUI* ui = aStyle.StyleUI();
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if (ui->HasCustomScrollbars()) {
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const auto& colors = ui->mScrollbarColor.AsColors();
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params.custom = true;
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params.trackColor = colors.track.CalcColor(aStyle);
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params.faceColor = colors.thumb.CalcColor(aStyle);
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}
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}
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return params;
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}
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auto ScrollbarDrawingMac::GetThumbRect(const Rect& aRect,
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const ScrollbarParams& aParams,
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float aScale) -> ThumbRect {
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// This matches the sizing checks in GetMinimumWidgetSize etc.
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aScale = aScale >= 2.0f ? 2.0f : 1.0f;
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// Compute the thumb thickness. This varies based on aParams.small,
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// aParams.overlay and aParams.rolledOver. non-overlay: 6 / 8, overlay
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// non-hovered: 5 / 7, overlay hovered: 9 / 11
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float thickness = aParams.small ? 6.0f : 8.0f;
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if (aParams.overlay) {
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thickness -= 1.0f;
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if (aParams.rolledOver) {
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thickness += 4.0f;
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}
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}
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thickness *= aScale;
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// Compute the thumb rect.
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const float outerSpacing =
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((aParams.overlay || aParams.small) ? 1.0f : 2.0f) * aScale;
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Rect thumbRect = aRect;
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thumbRect.Deflate(1.0f * aScale);
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if (aParams.horizontal) {
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float bottomEdge = thumbRect.YMost() - outerSpacing;
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thumbRect.SetBoxY(bottomEdge - thickness, bottomEdge);
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} else {
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if (aParams.rtl) {
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float leftEdge = thumbRect.X() + outerSpacing;
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thumbRect.SetBoxX(leftEdge, leftEdge + thickness);
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} else {
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float rightEdge = thumbRect.XMost() - outerSpacing;
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thumbRect.SetBoxX(rightEdge - thickness, rightEdge);
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}
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}
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// Compute the thumb fill color.
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nscolor faceColor;
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if (aParams.custom) {
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faceColor = aParams.faceColor;
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} else {
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if (aParams.overlay) {
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faceColor = aParams.onDarkBackground ? NS_RGBA(255, 255, 255, 128)
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: NS_RGBA(0, 0, 0, 128);
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} else if (aParams.onDarkBackground) {
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faceColor = aParams.rolledOver ? NS_RGBA(158, 158, 158, 255)
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: NS_RGBA(117, 117, 117, 255);
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} else {
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faceColor = aParams.rolledOver ? NS_RGBA(125, 125, 125, 255)
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: NS_RGBA(194, 194, 194, 255);
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}
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}
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nscolor strokeColor = 0;
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float strokeOutset = 0.0f;
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float strokeWidth = 0.0f;
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// Overlay scrollbars have an additional stroke around the fill.
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if (aParams.overlay) {
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strokeOutset = (aParams.onDarkBackground ? 0.3f : 0.5f) * aScale;
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strokeWidth = (aParams.onDarkBackground ? 0.6f : 0.8f) * aScale;
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strokeColor = aParams.onDarkBackground ? NS_RGBA(0, 0, 0, 48)
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: NS_RGBA(255, 255, 255, 48);
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}
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return {thumbRect, faceColor, strokeColor, strokeWidth, strokeOutset};
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}
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struct ScrollbarTrackDecorationColors {
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nscolor mInnerColor = 0;
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nscolor mShadowColor = 0;
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nscolor mOuterColor = 0;
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};
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static ScrollbarTrackDecorationColors ComputeScrollbarTrackDecorationColors(
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nscolor aTrackColor) {
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ScrollbarTrackDecorationColors result;
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float luminance = RelativeLuminanceUtils::Compute(aTrackColor);
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if (luminance >= 0.5f) {
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result.mInnerColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 0.836f);
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result.mShadowColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 0.982f);
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result.mOuterColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 0.886f);
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} else {
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result.mInnerColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 1.196f);
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result.mShadowColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 1.018f);
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result.mOuterColor =
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RelativeLuminanceUtils::Adjust(aTrackColor, luminance * 1.129f);
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}
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return result;
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}
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bool ScrollbarDrawingMac::GetScrollbarTrackRects(const Rect& aRect,
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const ScrollbarParams& aParams,
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float aScale,
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ScrollbarTrackRects& aRects) {
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if (aParams.overlay && !aParams.rolledOver) {
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// Non-hovered overlay scrollbars don't have a track. Draw nothing.
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return false;
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}
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// This matches the sizing checks in GetMinimumWidgetSize etc.
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aScale = aScale >= 2.0f ? 2.0f : 1.0f;
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nscolor trackColor;
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if (aParams.custom) {
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trackColor = aParams.trackColor;
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} else {
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if (aParams.overlay) {
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trackColor = aParams.onDarkBackground ? NS_RGBA(201, 201, 201, 38)
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: NS_RGBA(250, 250, 250, 191);
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} else {
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trackColor = aParams.onDarkBackground ? NS_RGBA(46, 46, 46, 255)
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: NS_RGBA(250, 250, 250, 255);
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}
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}
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float thickness = aParams.horizontal ? aRect.height : aRect.width;
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// The scrollbar track is drawn as multiple non-overlapping segments, which
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// make up lines of different widths and with slightly different shading.
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ScrollbarTrackDecorationColors colors =
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ComputeScrollbarTrackDecorationColors(trackColor);
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struct {
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nscolor color;
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float thickness;
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} segments[] = {
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{colors.mInnerColor, 1.0f * aScale},
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{colors.mShadowColor, 1.0f * aScale},
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{trackColor, thickness - 3.0f * aScale},
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{colors.mOuterColor, 1.0f * aScale},
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};
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// Iterate over the segments "from inside to outside" and fill each segment.
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// For horizontal scrollbars, iterate top to bottom.
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// For vertical scrollbars, iterate left to right or right to left based on
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// aParams.rtl.
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auto current = aRects.begin();
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float accumulatedThickness = 0.0f;
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for (const auto& segment : segments) {
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Rect segmentRect = aRect;
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float startThickness = accumulatedThickness;
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float endThickness = startThickness + segment.thickness;
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if (aParams.horizontal) {
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segmentRect.SetBoxY(aRect.Y() + startThickness, aRect.Y() + endThickness);
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} else {
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if (aParams.rtl) {
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segmentRect.SetBoxX(aRect.XMost() - endThickness,
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aRect.XMost() - startThickness);
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} else {
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segmentRect.SetBoxX(aRect.X() + startThickness,
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aRect.X() + endThickness);
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}
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}
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accumulatedThickness = endThickness;
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*current++ = {segmentRect, segment.color};
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}
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return true;
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}
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bool ScrollbarDrawingMac::GetScrollCornerRects(const Rect& aRect,
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const ScrollbarParams& aParams,
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float aScale,
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ScrollCornerRects& aRects) {
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if (aParams.overlay && !aParams.rolledOver) {
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// Non-hovered overlay scrollbars don't have a corner. Draw nothing.
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return false;
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}
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// This matches the sizing checks in GetMinimumWidgetSize etc.
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aScale = aScale >= 2.0f ? 2.0f : 1.0f;
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// Draw the following scroll corner.
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//
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// Output: Rectangles:
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// +---+---+----------+---+ +---+---+----------+---+
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// | I | S | T ... T | O | | I | S | T ... T | O |
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// +---+ | | | +---+---+ | |
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// | S S | T ... T | | | S S | T ... T | . |
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// +-------+ | . | +-------+----------+ . |
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// | T ... T | . | | T ... T | . |
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// | . . | . | | . . | |
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// | T ... T | | | T ... T | O |
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// +------------------+ | +------------------+---+
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// | O ... O | | O ... O |
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// +----------------------+ +----------------------+
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float width = aRect.width;
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float height = aRect.height;
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nscolor trackColor;
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if (aParams.custom) {
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trackColor = aParams.trackColor;
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} else {
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trackColor = aParams.onDarkBackground ? NS_RGBA(46, 46, 46, 255)
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: NS_RGBA(250, 250, 250, 255);
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}
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ScrollbarTrackDecorationColors colors =
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ComputeScrollbarTrackDecorationColors(trackColor);
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struct {
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nscolor color;
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Rect relativeRect;
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} pieces[] = {
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{colors.mInnerColor, {0.0f, 0.0f, 1.0f * aScale, 1.0f * aScale}},
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{colors.mShadowColor,
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{1.0f * aScale, 0.0f, 1.0f * aScale, 1.0f * aScale}},
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{colors.mShadowColor,
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{0.0f, 1.0f * aScale, 2.0f * aScale, 1.0f * aScale}},
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{trackColor, {2.0f * aScale, 0.0f, width - 3.0f * aScale, 2.0f * aScale}},
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{trackColor,
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{0.0f, 2.0f * aScale, width - 1.0f * aScale, height - 3.0f * aScale}},
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{colors.mOuterColor,
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{width - 1.0f * aScale, 0.0f, 1.0f * aScale, height - 1.0f * aScale}},
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{colors.mOuterColor,
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{0.0f, height - 1.0f * aScale, width, 1.0f * aScale}},
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};
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auto current = aRects.begin();
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for (const auto& piece : pieces) {
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Rect pieceRect = piece.relativeRect + aRect.TopLeft();
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if (aParams.rtl) {
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pieceRect.x = aRect.XMost() - piece.relativeRect.XMost();
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}
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*current++ = {pieceRect, piece.color};
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}
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return true;
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}
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} // namespace widget
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} // namespace mozilla
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