Add theme management functionality to the application

Implemented a theme management system allowing users to select and persist themes (default, light, dark) in the settings menu.

theme/repository.go

@@ -0,0 +1,28 @@
+package theme
+
+import "git.kor-elf.net/kor-elf/gui-for-ffmpeg/setting"
+
+type RepositoryContract interface {
+	GetCode() string
+	Save(code string) (setting.Setting, error)
+}
+
+type Repository struct {
+	settingRepository setting.RepositoryContract
+}
+
+func NewRepository(settingRepository setting.RepositoryContract) *Repository {
+	return &Repository{settingRepository: settingRepository}
+}
+
+func (r Repository) GetCode() string {
+	name, err := r.settingRepository.GetValue("theme")
+	if err != nil {
+		return "default"
+	}
+	return name
+}
+
+func (r Repository) Save(code string) (setting.Setting, error) {
+	return r.settingRepository.CreateOrUpdate("theme", code)
+}

theme/theme.go

@@ -0,0 +1,158 @@
+package theme
+
+import (
+	"fyne.io/fyne/v2"
+	fyneTheme "fyne.io/fyne/v2/theme"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/kernel"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"image/color"
+)
+
+type ThemeContract interface {
+	List() map[string]ThemeInfoContract
+	GetCurrentThemeInfo() ThemeInfoContract
+	SetCurrentTheme(themeInfo ThemeInfoContract) error
+}
+
+type theme struct {
+	app        kernel.AppContract
+	repository RepositoryContract
+	list       map[string]ThemeInfoContract
+}
+
+func NewTheme(app kernel.AppContract, repository RepositoryContract) ThemeContract {
+	theme := &theme{
+		app:        app,
+		repository: repository,
+		list:       getThemes(app.GetLocalizerService()),
+	}
+
+	theme.init()
+
+	return theme
+}
+
+func (t theme) init() {
+	themeInfo := t.GetCurrentThemeInfo()
+	if themeInfo.GetName() == "default" {
+		t.app.GetAppFyne().Settings().SetTheme(fyneTheme.DefaultTheme())
+		return
+	}
+	t.app.GetAppFyne().Settings().SetTheme(&forcedVariant{theme: fyneTheme.DefaultTheme(), variant: themeInfo.GetVariant()})
+}
+
+func (t theme) GetCurrentThemeInfo() ThemeInfoContract {
+	themes := t.List()
+	if themeInfo, ok := themes[t.repository.GetCode()]; ok {
+		return themeInfo
+	}
+
+	return themes["default"]
+}
+
+func (t theme) List() map[string]ThemeInfoContract {
+	return t.list
+}
+
+func (t theme) SetCurrentTheme(themeInfo ThemeInfoContract) error {
+	_, err := t.repository.Save(themeInfo.GetName())
+	if err != nil {
+		return err
+	}
+
+	if themeInfo.GetName() == "default" {
+		t.app.GetAppFyne().Settings().SetTheme(fyneTheme.DefaultTheme())
+		return nil
+	}
+	t.app.GetAppFyne().Settings().SetTheme(&forcedVariant{theme: fyneTheme.DefaultTheme(), variant: themeInfo.GetVariant()})
+
+	return nil
+}
+
+type ThemeInfoContract interface {
+	GetName() string
+	GetTitle() string
+	GetVariant() fyne.ThemeVariant
+}
+
+type themeInfo struct {
+	name    string
+	title   string
+	variant fyne.ThemeVariant
+}
+
+func (inf themeInfo) GetName() string {
+	return inf.name
+}
+
+func (inf themeInfo) GetTitle() string {
+	return inf.title
+}
+
+func (inf themeInfo) GetVariant() fyne.ThemeVariant {
+	return inf.variant
+}
+
+func getThemes(localizer kernel.LocalizerContract) map[string]ThemeInfoContract {
+	themesNameDefault := &themeInfo{
+		name: "default",
+		title: localizer.GetMessage(&i18n.LocalizeConfig{
+			MessageID: "themesNameDefault",
+		}),
+	}
+
+	themesNameLight := &themeInfo{
+		name: "light",
+		title: localizer.GetMessage(&i18n.LocalizeConfig{
+			MessageID: "themesNameLight",
+		}),
+		variant: fyneTheme.VariantLight,
+	}
+
+	themesNameDark := &themeInfo{
+		name: "dark",
+		title: localizer.GetMessage(&i18n.LocalizeConfig{
+			MessageID: "themesNameDark",
+		}),
+		variant: fyneTheme.VariantDark,
+	}
+
+	list := map[string]ThemeInfoContract{
+		"default": themesNameDefault,
+		"light":   themesNameLight,
+		"dark":    themesNameDark,
+	}
+
+	localizer.AddChangeCallback("themesNameDefault", func(text string) {
+		themesNameDefault.title = text
+	})
+	localizer.AddChangeCallback("themesNameLight", func(text string) {
+		themesNameLight.title = text
+	})
+	localizer.AddChangeCallback("themesNameDark", func(text string) {
+		themesNameDark.title = text
+	})
+
+	return list
+}
+
+type forcedVariant struct {
+	theme   fyne.Theme
+	variant fyne.ThemeVariant
+}
+
+func (f *forcedVariant) Color(name fyne.ThemeColorName, _ fyne.ThemeVariant) color.Color {
+	return f.theme.Color(name, f.variant)
+}
+
+func (f *forcedVariant) Font(style fyne.TextStyle) fyne.Resource {
+	return fyneTheme.DefaultTheme().Font(style)
+}
+
+func (f *forcedVariant) Icon(name fyne.ThemeIconName) fyne.Resource {
+	return fyneTheme.DefaultTheme().Icon(name)
+}
+
+func (f *forcedVariant) Size(name fyne.ThemeSizeName) float32 {
+	return fyneTheme.DefaultTheme().Size(name)
+}