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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/native_theme/native_theme_base.h"
#include "base/test/scoped_feature_list.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/color_utils.h"
#include "ui/native_theme/features/native_theme_features.h"
namespace ui {
class NativeThemeBaseTest : public NativeThemeBase, public testing::Test {
public:
SkColor GetContrastingPressedOrHoveredColor(
SkColor fg,
std::optional<SkColor> bg = std::nullopt) {
return NativeThemeBase::GetContrastingPressedOrHoveredColor(
fg, bg, /*state=*/NativeTheme::State::kHovered,
/*part=*/Part::kScrollbarVerticalThumb)
.value();
}
float GetBaseContrastRatio() {
return NativeThemeBase::GetContrastRatioForState(
/*state=*/NativeTheme::State::kHovered,
/*part=*/Part::kScrollbarVerticalThumb);
}
};
// Check that `GetContrastingPressedOrHoveredColor` doesn't modify fully
// transparent colors.
TEST_F(NativeThemeBaseTest, GetContrastingPressedOrHoveredTransparent) {
const SkColor transparent_color = SkColorSetARGB(0x00, 0xBA, 0x74, 0x74);
EXPECT_EQ(transparent_color,
GetContrastingPressedOrHoveredColor(transparent_color));
}
// Tests that the `GetContrastingPressedOrHoveredColor` can adapt to a whole
// range of luminosity for the colors to modify.
TEST_F(NativeThemeBaseTest, GetContrastingPressedOrHoveredColor) {
for (unsigned i = 0; i < 255; i++) {
const SkColor color = SkColorSetRGB(i, i, i);
const float luminance = color_utils::GetRelativeLuminance(color);
const float adjusted_luminance = color_utils::GetRelativeLuminance(
GetContrastingPressedOrHoveredColor(color));
if (color_utils::IsDark(color)) {
EXPECT_GT(adjusted_luminance, luminance);
} else {
EXPECT_LT(adjusted_luminance, luminance);
}
}
}
// Tests that the returned color never loses contrast against the background
// color.
TEST_F(NativeThemeBaseTest,
GetContrastingPressedOrHoveredColorBackgroundContrast) {
for (int c = 0; c < 24; c += 8) {
// Test with Green, Blue and Red.
const SkColor bg_color = SkColorSetA(SkColor(0x80 << (c)), SK_AlphaOPAQUE);
for (U8CPU i = 0; i < 255; i++) {
const SkColor adjusted_color = GetContrastingPressedOrHoveredColor(
SkColorSetA(SkColor(i << (c)), SK_AlphaOPAQUE), bg_color);
EXPECT_GT(color_utils::GetContrastRatio(bg_color, adjusted_color),
GetBaseContrastRatio());
}
}
}
// Checks that grayscale colors never lose contrast with the background when it
// is different shades of gray.
TEST_F(NativeThemeBaseTest, GetContrastingPressedOrHoveredColorGrayScales) {
static constexpr auto kColors =
std::to_array({SK_ColorWHITE, SK_ColorLTGRAY, SK_ColorGRAY,
SK_ColorDKGRAY, SK_ColorBLACK});
for (const auto foreground : kColors) {
for (const auto background : kColors) {
const float background_contrast_ratio = color_utils::GetContrastRatio(
background,
GetContrastingPressedOrHoveredColor(foreground, background));
const float base_contrast_ratio = GetBaseContrastRatio();
EXPECT_GE(background_contrast_ratio, base_contrast_ratio);
}
}
}
// Checks that transparent foreground colors don't lose contrast against the
// background when altered.
TEST_F(NativeThemeBaseTest, GetContrastingPressedOrHoveredTransparencies) {
for (const auto background : {SK_ColorBLACK, SK_ColorWHITE}) {
for (auto foreground : {SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE}) {
for (int i = 1; i < 4; i++) {
foreground = SkColorSetA(foreground, SK_AlphaOPAQUE * i / 4);
const float background_contrast_ratio = color_utils::GetContrastRatio(
background,
GetContrastingPressedOrHoveredColor(foreground, background));
const float base_contrast_ratio = GetBaseContrastRatio();
EXPECT_GE(background_contrast_ratio, base_contrast_ratio);
}
}
}
}
// Tests that colors are not modified if the feature flag is disabled.
TEST_F(NativeThemeBaseTest, GetContrastingPressedOrHoveredDisableFeature) {
base::test::ScopedFeatureList feature_list;
feature_list.InitAndDisableFeature(
::features::kModifyScrollbarCssColorOnHoverOrPress);
EXPECT_EQ(GetContrastingPressedOrHoveredColor(SK_ColorRED, SK_ColorBLACK),
SK_ColorRED);
}
} // namespace ui
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