зеркало из https://github.com/mozilla/gecko-dev.git
399 строки
15 KiB
C++
399 строки
15 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 "ScrollbarDrawing.h"
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#include "mozilla/RelativeLuminanceUtils.h"
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#include "mozilla/StaticPrefs_widget.h"
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#include "nsContainerFrame.h"
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#include "nsDeviceContext.h"
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#include "nsIFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsLookAndFeel.h"
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#include "nsNativeTheme.h"
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using namespace mozilla::gfx;
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namespace mozilla::widget {
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using mozilla::RelativeLuminanceUtils;
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/* static */
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auto ScrollbarDrawing::GetDPIRatioForScrollbarPart(nsPresContext* aPc)
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-> DPIRatio {
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if (auto* rootPc = aPc->GetRootPresContext()) {
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if (nsCOMPtr<nsIWidget> widget = rootPc->GetRootWidget()) {
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return widget->GetDefaultScale();
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}
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}
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return DPIRatio(
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float(AppUnitsPerCSSPixel()) /
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float(aPc->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom()));
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}
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/*static*/
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nsIFrame* ScrollbarDrawing::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*/
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bool ScrollbarDrawing::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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/*static*/
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bool ScrollbarDrawing::IsParentScrollbarHoveredOrActive(nsIFrame* aFrame) {
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nsIFrame* scrollbarFrame = GetParentScrollbarFrame(aFrame);
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return scrollbarFrame && scrollbarFrame->GetContent()
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->AsElement()
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->State()
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.HasAtLeastOneOfStates(NS_EVENT_STATE_HOVER |
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NS_EVENT_STATE_ACTIVE);
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}
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/*static*/
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bool ScrollbarDrawing::IsScrollbarWidthThin(const ComputedStyle& aStyle) {
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auto scrollbarWidth = aStyle.StyleUIReset()->ScrollbarWidth();
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return scrollbarWidth == StyleScrollbarWidth::Thin;
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}
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/*static*/
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bool ScrollbarDrawing::IsScrollbarWidthThin(nsIFrame* aFrame) {
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ComputedStyle* style = nsLayoutUtils::StyleForScrollbar(aFrame);
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return IsScrollbarWidthThin(*style);
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}
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auto ScrollbarDrawing::GetScrollbarSizes(nsPresContext* aPresContext,
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StyleScrollbarWidth aWidth, Overlay)
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-> ScrollbarSizes {
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uint32_t h = GetHorizontalScrollbarHeight();
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uint32_t w = GetVerticalScrollbarWidth();
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if (aWidth == StyleScrollbarWidth::Thin) {
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h /= 2;
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w /= 2;
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}
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auto dpi = GetDPIRatioForScrollbarPart(aPresContext);
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return {(CSSCoord(w) * dpi).Rounded(), (CSSCoord(h) * dpi).Rounded()};
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}
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auto ScrollbarDrawing::GetScrollbarSizes(nsPresContext* aPresContext,
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nsIFrame* aFrame) -> ScrollbarSizes {
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auto* style = nsLayoutUtils::StyleForScrollbar(aFrame);
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auto width = style->StyleUIReset()->ScrollbarWidth();
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auto overlay =
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aPresContext->UseOverlayScrollbars() ? Overlay::Yes : Overlay::No;
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return GetScrollbarSizes(aPresContext, width, overlay);
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}
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bool ScrollbarDrawing::IsScrollbarTrackOpaque(nsIFrame* aFrame) {
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auto trackColor = ComputeScrollbarTrackColor(
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aFrame, *nsLayoutUtils::StyleForScrollbar(aFrame),
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aFrame->PresContext()->Document()->GetDocumentState(),
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Colors(aFrame, StyleAppearance::ScrollbartrackVertical));
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return trackColor.a == 1.0f;
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}
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sRGBColor ScrollbarDrawing::ComputeScrollbarTrackColor(
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nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aDocumentState, const Colors& aColors) {
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if (aColors.HighContrast()) {
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return aColors.System(StyleSystemColor::Window);
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}
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const nsStyleUI* ui = aStyle.StyleUI();
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if (ui->mScrollbarColor.IsColors()) {
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return sRGBColor::FromABGR(
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ui->mScrollbarColor.AsColors().track.CalcColor(aStyle));
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}
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static constexpr sRGBColor sDefaultDarkTrackColor =
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sRGBColor::FromU8(20, 20, 25, 77);
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static constexpr sRGBColor sDefaultTrackColor(
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gfx::sRGBColor::UnusualFromARGB(0xfff0f0f0));
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auto systemColor =
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aDocumentState.HasAllStates(NS_DOCUMENT_STATE_WINDOW_INACTIVE)
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? StyleSystemColor::ThemedScrollbarInactive
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: StyleSystemColor::ThemedScrollbar;
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return aColors.SystemOrElse(systemColor, [&] {
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return aColors.IsDark() ? sDefaultDarkTrackColor : sDefaultTrackColor;
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});
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}
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// Don't use the theme color for dark scrollbars if it's not a color (if it's
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// grey-ish), as that'd either lack enough contrast, or be close to what we'd do
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// by default anyways.
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sRGBColor ScrollbarDrawing::ComputeScrollbarThumbColor(
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nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aElementState, const EventStates& aDocumentState,
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const Colors& aColors) {
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const nsStyleUI* ui = aStyle.StyleUI();
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if (ui->mScrollbarColor.IsColors()) {
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return sRGBColor::FromABGR(ThemeColors::AdjustUnthemedScrollbarThumbColor(
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ui->mScrollbarColor.AsColors().thumb.CalcColor(aStyle), aElementState));
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}
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auto systemColor = [&] {
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if (aDocumentState.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
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return StyleSystemColor::ThemedScrollbarThumbInactive;
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}
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if (aElementState.HasState(NS_EVENT_STATE_ACTIVE)) {
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if (aColors.HighContrast()) {
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return StyleSystemColor::Selecteditem;
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}
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return StyleSystemColor::ThemedScrollbarThumbActive;
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}
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if (aElementState.HasState(NS_EVENT_STATE_HOVER)) {
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if (aColors.HighContrast()) {
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return StyleSystemColor::Selecteditem;
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}
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return StyleSystemColor::ThemedScrollbarThumbHover;
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}
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if (aColors.HighContrast()) {
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return StyleSystemColor::Windowtext;
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}
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return StyleSystemColor::ThemedScrollbarThumb;
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}();
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return aColors.SystemOrElse(systemColor, [&] {
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const nscolor unthemedColor = aColors.IsDark() ? NS_RGBA(249, 249, 250, 102)
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: NS_RGB(0xcd, 0xcd, 0xcd);
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return sRGBColor::FromABGR(ThemeColors::AdjustUnthemedScrollbarThumbColor(
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unthemedColor, aElementState));
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});
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}
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template <typename PaintBackendData>
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bool ScrollbarDrawing::DoPaintDefaultScrollbar(
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PaintBackendData& aPaintData, const LayoutDeviceRect& aRect,
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bool aHorizontal, nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aElementState, const EventStates& aDocumentState,
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const Colors& aColors, const DPIRatio& aDpiRatio) {
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if (aFrame->PresContext()->UseOverlayScrollbars() &&
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!aElementState.HasAtLeastOneOfStates(NS_EVENT_STATE_HOVER |
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NS_EVENT_STATE_ACTIVE)) {
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return true;
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}
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auto scrollbarColor =
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ComputeScrollbarTrackColor(aFrame, aStyle, aDocumentState, aColors);
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ThemeDrawing::FillRect(aPaintData, aRect, scrollbarColor);
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return true;
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}
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bool ScrollbarDrawing::PaintScrollbar(
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DrawTarget& aDrawTarget, const LayoutDeviceRect& aRect, bool aHorizontal,
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nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aElementState, const EventStates& aDocumentState,
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const Colors& aColors, const DPIRatio& aDpiRatio) {
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return DoPaintDefaultScrollbar(aDrawTarget, aRect, aHorizontal, aFrame,
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aStyle, aElementState, aDocumentState, aColors,
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aDpiRatio);
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}
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bool ScrollbarDrawing::PaintScrollbar(
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WebRenderBackendData& aWrData, const LayoutDeviceRect& aRect,
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bool aHorizontal, nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aElementState, const EventStates& aDocumentState,
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const Colors& aColors, const DPIRatio& aDpiRatio) {
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return DoPaintDefaultScrollbar(aWrData, aRect, aHorizontal, aFrame, aStyle,
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aElementState, aDocumentState, aColors,
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aDpiRatio);
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}
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template <typename PaintBackendData>
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bool ScrollbarDrawing::DoPaintDefaultScrollCorner(
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PaintBackendData& aPaintData, const LayoutDeviceRect& aRect,
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nsIFrame* aFrame, const ComputedStyle& aStyle,
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const EventStates& aDocumentState, const Colors& aColors,
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const DPIRatio& aDpiRatio) {
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auto scrollbarColor =
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ComputeScrollbarTrackColor(aFrame, aStyle, aDocumentState, aColors);
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ThemeDrawing::FillRect(aPaintData, aRect, scrollbarColor);
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return true;
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}
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bool ScrollbarDrawing::PaintScrollCorner(
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DrawTarget& aDrawTarget, const LayoutDeviceRect& aRect, nsIFrame* aFrame,
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const ComputedStyle& aStyle, const EventStates& aDocumentState,
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const Colors& aColors, const DPIRatio& aDpiRatio) {
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return DoPaintDefaultScrollCorner(aDrawTarget, aRect, aFrame, aStyle,
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aDocumentState, aColors, aDpiRatio);
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}
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bool ScrollbarDrawing::PaintScrollCorner(WebRenderBackendData& aWrData,
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const LayoutDeviceRect& aRect,
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nsIFrame* aFrame,
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const ComputedStyle& aStyle,
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const EventStates& aDocumentState,
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const Colors& aColors,
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const DPIRatio& aDpiRatio) {
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return DoPaintDefaultScrollCorner(aWrData, aRect, aFrame, aStyle,
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aDocumentState, aColors, aDpiRatio);
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}
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nscolor ScrollbarDrawing::GetScrollbarButtonColor(nscolor aTrackColor,
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EventStates aStates) {
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// See numbers in GetScrollbarArrowColor.
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// This function is written based on ratios between values listed there.
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bool isActive = aStates.HasState(NS_EVENT_STATE_ACTIVE);
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bool isHover = aStates.HasState(NS_EVENT_STATE_HOVER);
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if (!isActive && !isHover) {
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return aTrackColor;
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}
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float luminance = RelativeLuminanceUtils::Compute(aTrackColor);
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if (isActive) {
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if (luminance >= 0.18f) {
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luminance *= 0.134f;
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} else {
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luminance /= 0.134f;
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luminance = std::min(luminance, 1.0f);
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}
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} else {
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if (luminance >= 0.18f) {
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luminance *= 0.805f;
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} else {
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luminance /= 0.805f;
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}
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}
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return RelativeLuminanceUtils::Adjust(aTrackColor, luminance);
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}
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Maybe<nscolor> ScrollbarDrawing::GetScrollbarArrowColor(nscolor aButtonColor) {
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// In Windows 10 scrollbar, there are several gray colors used:
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//
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// State | Background (lum) | Arrow | Contrast
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// -------+------------------+---------+---------
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// Normal | Gray 240 (87.1%) | Gray 96 | 5.5
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// Hover | Gray 218 (70.1%) | Black | 15.0
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// Active | Gray 96 (11.7%) | White | 6.3
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//
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// Contrast value is computed based on the definition in
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// https://www.w3.org/TR/WCAG20/#contrast-ratiodef
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//
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// This function is written based on these values.
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if (NS_GET_A(aButtonColor) == 0) {
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// If the button color is transparent, because of e.g.
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// scrollbar-color: <something> transparent, then use
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// the thumb color, which is expected to have enough
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// contrast.
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return Nothing();
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}
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float luminance = RelativeLuminanceUtils::Compute(aButtonColor);
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// Color with luminance larger than 0.72 has contrast ratio over 4.6
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// to color with luminance of gray 96, so this value is chosen for
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// this range. It is the luminance of gray 221.
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if (luminance >= 0.72) {
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// ComputeRelativeLuminanceFromComponents(96). That function cannot
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// be constexpr because of std::pow.
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const float GRAY96_LUMINANCE = 0.117f;
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return Some(RelativeLuminanceUtils::Adjust(aButtonColor, GRAY96_LUMINANCE));
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}
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// The contrast ratio of a color to black equals that to white when its
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// luminance is around 0.18, with a contrast ratio ~4.6 to both sides,
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// thus the value below. It's the lumanince of gray 118.
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//
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// TODO(emilio): Maybe the button alpha is not the best thing to use here and
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// we should use the thumb alpha? It seems weird that the color of the arrow
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// depends on the opacity of the scrollbar thumb...
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if (luminance >= 0.18) {
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return Some(NS_RGBA(0, 0, 0, NS_GET_A(aButtonColor)));
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}
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return Some(NS_RGBA(255, 255, 255, NS_GET_A(aButtonColor)));
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}
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std::pair<sRGBColor, sRGBColor> ScrollbarDrawing::ComputeScrollbarButtonColors(
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nsIFrame* aFrame, StyleAppearance aAppearance, const ComputedStyle& aStyle,
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const EventStates& aElementState, const EventStates& aDocumentState,
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const Colors& aColors) {
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if (aColors.HighContrast()) {
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if (aElementState.HasAtLeastOneOfStates(NS_EVENT_STATE_ACTIVE |
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NS_EVENT_STATE_HOVER)) {
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return aColors.SystemPair(StyleSystemColor::Selecteditem,
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StyleSystemColor::Buttonface);
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}
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return aColors.SystemPair(StyleSystemColor::Window,
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StyleSystemColor::Windowtext);
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}
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auto trackColor =
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ComputeScrollbarTrackColor(aFrame, aStyle, aDocumentState, aColors);
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nscolor buttonColor =
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GetScrollbarButtonColor(trackColor.ToABGR(), aElementState);
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auto arrowColor =
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GetScrollbarArrowColor(buttonColor)
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.map(sRGBColor::FromABGR)
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.valueOrFrom([&] {
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return ComputeScrollbarThumbColor(aFrame, aStyle, aElementState,
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aDocumentState, aColors);
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});
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return {sRGBColor::FromABGR(buttonColor), arrowColor};
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}
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bool ScrollbarDrawing::PaintScrollbarButton(
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DrawTarget& aDrawTarget, StyleAppearance aAppearance,
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const LayoutDeviceRect& aRect, nsIFrame* aFrame,
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const ComputedStyle& aStyle, const EventStates& aElementState,
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const EventStates& aDocumentState, const Colors& aColors, const DPIRatio&) {
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auto [buttonColor, arrowColor] = ComputeScrollbarButtonColors(
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aFrame, aAppearance, aStyle, aElementState, aDocumentState, aColors);
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aDrawTarget.FillRect(aRect.ToUnknownRect(),
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ColorPattern(ToDeviceColor(buttonColor)));
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// Start with Up arrow.
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float arrowPolygonX[] = {-4.0f, 0.0f, 4.0f, 4.0f, 0.0f, -4.0f};
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float arrowPolygonY[] = {0.0f, -4.0f, 0.0f, 3.0f, -1.0f, 3.0f};
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const float kPolygonSize = 17;
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const int32_t arrowNumPoints = ArrayLength(arrowPolygonX);
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switch (aAppearance) {
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case StyleAppearance::ScrollbarbuttonUp:
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break;
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case StyleAppearance::ScrollbarbuttonDown:
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for (int32_t i = 0; i < arrowNumPoints; i++) {
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arrowPolygonY[i] *= -1;
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}
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break;
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case StyleAppearance::ScrollbarbuttonLeft:
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for (int32_t i = 0; i < arrowNumPoints; i++) {
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float temp = arrowPolygonX[i];
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arrowPolygonX[i] = arrowPolygonY[i];
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arrowPolygonY[i] = temp;
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}
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break;
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case StyleAppearance::ScrollbarbuttonRight:
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for (int32_t i = 0; i < arrowNumPoints; i++) {
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float temp = arrowPolygonX[i];
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arrowPolygonX[i] = arrowPolygonY[i] * -1;
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arrowPolygonY[i] = temp;
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}
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break;
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default:
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return false;
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}
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ThemeDrawing::PaintArrow(aDrawTarget, aRect, arrowPolygonX, arrowPolygonY,
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kPolygonSize, arrowNumPoints, arrowColor);
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return true;
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}
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} // namespace mozilla::widget
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