优化代码
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package ui
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import (
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"image/color"
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"fyne.io/fyne/v2"
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"fyne.io/fyne/v2/theme"
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)
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// 主题模式。
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const (
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ThemeSystem = "system" // 跟随系统
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ThemeContrast = "contrast" // 黑白高对比
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ThemeLight = "light" // 浅色高对比
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)
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// themeLabel 返回主题模式的中文名。
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func themeLabel(mode string) string {
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switch mode {
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case ThemeContrast:
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return "黑白高对比"
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case ThemeLight:
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return "浅色高对比"
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default:
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return "跟随系统"
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}
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}
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// themeOptions 返回设置页下拉里的可选项。
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func themeOptions() []string {
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return []string{
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themeLabel(ThemeSystem),
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themeLabel(ThemeContrast),
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themeLabel(ThemeLight),
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}
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}
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// themeFromLabel 由中文名反查主题模式。
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func themeFromLabel(label string) string {
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for _, mode := range []string{ThemeSystem, ThemeContrast, ThemeLight} {
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if themeLabel(mode) == label {
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return mode
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}
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}
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return ThemeSystem
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}
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// applyThemeMode 按主题模式切换界面主题。
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func applyThemeMode(mode string) {
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app := fyne.CurrentApp()
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if app == nil {
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return
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}
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switch mode {
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case ThemeContrast:
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app.Settings().SetTheme(newMonoTheme(darkPalette()))
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case ThemeLight:
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app.Settings().SetTheme(newMonoTheme(lightPalette()))
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default:
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app.Settings().SetTheme(theme.DefaultTheme())
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}
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}
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// monoTheme 是一套纯灰度主题：所有颜色都去掉彩度，只靠明暗区分层级，
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// 文字与背景的对比拉到最高。
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type monoTheme struct {
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base fyne.Theme
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colors map[fyne.ThemeColorName]color.Color
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}
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// newMonoTheme 用给定配色造一个主题，其余项沿用默认主题。
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func newMonoTheme(palette map[fyne.ThemeColorName]color.Color) fyne.Theme {
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return &monoTheme{base: theme.DefaultTheme(), colors: palette}
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}
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func (t *monoTheme) Color(name fyne.ThemeColorName, variant fyne.ThemeVariant) color.Color {
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if c, ok := t.colors[name]; ok {
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return c
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}
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return t.base.Color(name, variant)
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}
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func (t *monoTheme) Font(style fyne.TextStyle) fyne.Resource { return t.base.Font(style) }
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func (t *monoTheme) Icon(name fyne.ThemeIconName) fyne.Resource { return t.base.Icon(name) }
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func (t *monoTheme) Size(name fyne.ThemeSizeName) float32 { return t.base.Size(name) }
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// rgb 生成不透明灰度色。
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func rgb(v uint8) color.NRGBA {
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return color.NRGBA{R: v, G: v, B: v, A: 0xFF}
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}
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// darkPalette 是黑白高对比（纯黑底）的配色。
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func darkPalette() map[fyne.ThemeColorName]color.Color {
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return map[fyne.ThemeColorName]color.Color{
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theme.ColorNameBackground: rgb(0x00),
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theme.ColorNameForeground: rgb(0xFF),
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theme.ColorNameDisabled: rgb(0x8C),
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theme.ColorNameDisabledButton: rgb(0x1A),
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theme.ColorNameButton: rgb(0x2E),
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theme.ColorNameHover: rgb(0x4A),
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theme.ColorNamePressed: rgb(0x1E),
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theme.ColorNameFocus: rgb(0xFF),
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theme.ColorNamePrimary: rgb(0xFF),
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theme.ColorNameForegroundOnPrimary: rgb(0x00),
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theme.ColorNameSelection: rgb(0xFF),
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theme.ColorNameInputBackground: rgb(0x0B),
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theme.ColorNameInputBorder: rgb(0xE6),
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theme.ColorNamePlaceHolder: rgb(0xA6),
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theme.ColorNameSeparator: rgb(0x5A),
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theme.ColorNameOverlayBackground: rgb(0x11),
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theme.ColorNameMenuBackground: rgb(0x16),
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theme.ColorNameHeaderBackground: rgb(0x1C),
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theme.ColorNameInnerWindowBorder: rgb(0x3A),
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theme.ColorNameInnerWindowBorderInactive: rgb(0x26),
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theme.ColorNameScrollBar: rgb(0x9A),
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theme.ColorNameScrollBarBackground: rgb(0x1A),
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theme.ColorNameShadow: rgb(0x00),
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theme.ColorNameError: rgb(0xFF),
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theme.ColorNameForegroundOnError: rgb(0x00),
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theme.ColorNameSuccess: rgb(0xFF),
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theme.ColorNameForegroundOnSuccess: rgb(0x00),
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theme.ColorNameWarning: rgb(0xFF),
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theme.ColorNameForegroundOnWarning: rgb(0x00),
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theme.ColorNameHyperlink: rgb(0xFF),
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}
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}
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// lightPalette 是浅色高对比（纯白底）的配色。
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func lightPalette() map[fyne.ThemeColorName]color.Color {
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return map[fyne.ThemeColorName]color.Color{
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theme.ColorNameBackground: rgb(0xFF),
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theme.ColorNameForeground: rgb(0x00),
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theme.ColorNameDisabled: rgb(0x70),
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theme.ColorNameDisabledButton: rgb(0xF0),
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theme.ColorNameButton: rgb(0xE0),
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theme.ColorNameHover: rgb(0xC8),
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theme.ColorNamePressed: rgb(0xD4),
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theme.ColorNameFocus: rgb(0x00),
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theme.ColorNamePrimary: rgb(0x00),
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theme.ColorNameForegroundOnPrimary: rgb(0xFF),
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theme.ColorNameSelection: rgb(0x00),
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theme.ColorNameInputBackground: rgb(0xFF),
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theme.ColorNameInputBorder: rgb(0x00),
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theme.ColorNamePlaceHolder: rgb(0x70),
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theme.ColorNameSeparator: rgb(0x9A),
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theme.ColorNameOverlayBackground: rgb(0xF4),
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theme.ColorNameMenuBackground: rgb(0xFA),
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theme.ColorNameHeaderBackground: rgb(0xEF),
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theme.ColorNameInnerWindowBorder: rgb(0xC0),
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theme.ColorNameInnerWindowBorderInactive: rgb(0xD8),
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theme.ColorNameScrollBar: rgb(0x55),
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theme.ColorNameScrollBarBackground: rgb(0xED),
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theme.ColorNameShadow: rgb(0x00),
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theme.ColorNameError: rgb(0x00),
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theme.ColorNameForegroundOnError: rgb(0xFF),
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theme.ColorNameSuccess: rgb(0x00),
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theme.ColorNameForegroundOnSuccess: rgb(0xFF),
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theme.ColorNameWarning: rgb(0x00),
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theme.ColorNameForegroundOnWarning: rgb(0xFF),
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theme.ColorNameHyperlink: rgb(0x00),
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}
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}
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