优化代码

internal/ui/theme_test.go

@@ -0,0 +1,117 @@
+package ui
+
+import (
+	"image/color"
+	"testing"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/test"
+	"fyne.io/fyne/v2/theme"
+)
+
+// isGray 判断颜色是否是无彩度的灰度色。
+func isGray(c color.Color) bool {
+	n := color.NRGBAModel.Convert(c).(color.NRGBA)
+	return n.R == n.G && n.G == n.B
+}
+
+func TestThemeLabelRoundTrip(t *testing.T) {
+	for _, mode := range []string{ThemeSystem, ThemeContrast, ThemeLight} {
+		label := themeLabel(mode)
+		if got := themeFromLabel(label); got != mode {
+			t.Fatalf("主题 %q 的中文名 %q 反查应为 %q，实际 %q", mode, label, mode, got)
+		}
+	}
+	if got := themeFromLabel("不存在的名字"); got != ThemeSystem {
+		t.Fatalf("未知中文名应回落到 %q，实际 %q", ThemeSystem, got)
+	}
+	if len(themeOptions()) != 3 {
+		t.Fatalf("主题下拉应有 3 个选项，实际 %v", themeOptions())
+	}
+}
+
+func TestDarkPaletteIsPureBlackOnWhite(t *testing.T) {
+	p := darkPalette()
+
+	black := color.NRGBA{R: 0, G: 0, B: 0, A: 0xFF}
+	white := color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF}
+	if got := p[theme.ColorNameBackground]; got != black {
+		t.Fatalf("黑白主题背景应为纯黑，实际 %v", got)
+	}
+	if got := p[theme.ColorNameForeground]; got != white {
+		t.Fatalf("黑白主题文字应为纯白，实际 %v", got)
+	}
+	for name, c := range p {
+		if !isGray(c) {
+			t.Fatalf("黑白主题不应出现彩色：%s = %v", name, c)
+		}
+	}
+}
+
+func TestLightPaletteIsPureWhiteOnBlack(t *testing.T) {
+	p := lightPalette()
+
+	black := color.NRGBA{R: 0, G: 0, B: 0, A: 0xFF}
+	white := color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF}
+	if got := p[theme.ColorNameBackground]; got != white {
+		t.Fatalf("浅色主题背景应为纯白，实际 %v", got)
+	}
+	if got := p[theme.ColorNameForeground]; got != black {
+		t.Fatalf("浅色主题文字应为纯黑，实际 %v", got)
+	}
+	for name, c := range p {
+		if !isGray(c) {
+			t.Fatalf("浅色高对比主题不应出现彩色：%s = %v", name, c)
+		}
+	}
+}
+
+func TestMonoThemeFallsBackToDefault(t *testing.T) {
+	th := newMonoTheme(darkPalette())
+
+	black := color.NRGBA{R: 0, G: 0, B: 0, A: 0xFF}
+	// 调色板里有的走调色板。
+	if got := th.Color(theme.ColorNameBackground, theme.VariantDark); got != black {
+		t.Fatalf("背景色应取自调色板，实际 %v", got)
+	}
+	// 调色板里没有的沿用默认主题。
+	if got := th.Color(theme.ColorNameOverlayBackground, theme.VariantDark); got == nil {
+		t.Fatal("未覆盖的颜色名应回落到默认主题")
+	}
+	if th.Font(fyne.TextStyle{}) == nil || th.Size(theme.SizeNamePadding) <= 0 {
+		t.Fatal("字体与尺寸应沿用默认主题")
+	}
+}
+
+func TestApplyThemeModeSwitchesTheme(t *testing.T) {
+	app := test.NewApp()
+
+	black := color.NRGBA{R: 0, G: 0, B: 0, A: 0xFF}
+	white := color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF}
+
+	applyThemeMode(ThemeContrast)
+	mt, ok := app.Settings().Theme().(*monoTheme)
+	if !ok {
+		t.Fatalf("黑白模式应切到 monoTheme，实际 %T", app.Settings().Theme())
+	}
+	if got := mt.Color(theme.ColorNameBackground, app.Settings().ThemeVariant()); got != black {
+		t.Fatalf("黑白模式背景应为纯黑，实际 %v", got)
+	}
+
+	applyThemeMode(ThemeLight)
+	mt, ok = app.Settings().Theme().(*monoTheme)
+	if !ok {
+		t.Fatalf("浅色模式应切到 monoTheme，实际 %T", app.Settings().Theme())
+	}
+	if got := mt.Color(theme.ColorNameBackground, app.Settings().ThemeVariant()); got != white {
+		t.Fatalf("浅色模式背景应为纯白，实际 %v", got)
+	}
+
+	applyThemeMode(ThemeSystem)
+	if _, ok := app.Settings().Theme().(*monoTheme); ok {
+		t.Fatal("跟随系统应还原默认主题")
+	}
+	if got := app.Settings().Theme().Color(theme.ColorNameBackground, app.Settings().ThemeVariant()); got == nil {
+		t.Fatal("默认主题应能取到背景色")
+	}
+}