[client] Add light mode with system, light, and dark theme options (#7344)

* desktop UI light mode * Theme review fixes plus macOS window outline fix * Windows runtime chrome re-theming plus apply serialization * Windows chrome threading and theme event ordering fixes * Darken toggle and setting sidebar text * resolve theme appearance, apply on UI thread * read theme once per window * Re-assert Windows dark opt-in after SetTheme * split app-wide GTK theming from per-window chrome * Update Wails dependency and checksums * KDE tray icon panel fix * Five review fixes: theme ordering, cgo dedup, KDE panel resolution * Path guard hardening, toggle contrast, windows comment * non-vacuous escape tests * Default view edits * Polish settings nav, controls, borders, and disc * Profiles settings boarder, modals, and buttons * Additional edits based on feedback * Switch colors away from slight blue hue * Update missing lang * Fix vertical tab active view
2026-09-23 15:19:08 +02:00 · 2026-09-11 08:25:10 -07:00
parent f422c41654
commit ec0c36b0e7
68 changed files with 1853 additions and 259 deletions
@@ -0,0 +1,99 @@
+//go:build linux && cgo && !android && !ios
+
+package services
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// setAppAppearance points GTK at the light or dark variant of the current theme
+// so the decorations match the webview. Without it a forced Light theme keeps
+// dark decorations on a dark desktop, and the reverse.
+//
+// The theme name is switched, not just gtk-application-prefer-dark-theme:
+// desktops such as Ubuntu implement dark mode as a separate theme (Yaru-dark),
+// which that flag cannot lighten. The flag is still set for themes that do
+// carry both variants under one name. Both are per-process settings, so this
+// changes only our own decorations; GTK re-reads the desktop value on a change,
+// which is why Theme.apply re-asserts. Must run on the main thread.
+//
+// GTK styling is app-wide, which is why this is separate from
+// setWindowAppearance: it must be applied even when no window exists yet, since
+// windows created later inherit it rather than carrying it in their options.
+func setAppAppearance(dark bool) {
+	target := baseGtkTheme(gtkThemeName())
+	if dark {
+		if variant, ok := darkGtkVariant(target); ok {
+			target = variant
+		}
+	}
+	// An unknown name would leave GTK with no theme at all, so fall back to
+	// changing nothing and let the prefer-dark flag do what it can.
+	if target != "" && !gtkThemeExists(target) {
+		target = ""
+	}
+	applyGtkTheme(target, dark)
+}
+
+// baseGtkTheme strips a dark-variant suffix, so "Yaru-dark" becomes "Yaru".
+func baseGtkTheme(name string) string {
+	for _, suffix := range []string{"-dark", "-Dark"} {
+		if len(name) > len(suffix) && strings.EqualFold(name[len(name)-len(suffix):], suffix) {
+			return name[:len(name)-len(suffix)]
+		}
+	}
+	return name
+}
+
+// darkGtkVariant reports the installed dark counterpart of a base theme name.
+// Themes that carry both variants under one name have none, and rely on
+// gtk-application-prefer-dark-theme instead.
+func darkGtkVariant(base string) (string, bool) {
+	if base == "" {
+		return "", false
+	}
+	for _, suffix := range []string{"-dark", "-Dark"} {
+		if candidate := base + suffix; gtkThemeExists(candidate) {
+			return candidate, true
+		}
+	}
+	return "", false
+}
+
+// gtkThemeExists reports whether a theme of that name is installed, searching
+// the same locations GTK does.
+func gtkThemeExists(name string) bool {
+	if name == "" {
+		return false
+	}
+	for _, dir := range gtkThemeDirs() {
+		if info, err := os.Stat(filepath.Join(dir, name)); err == nil && info.IsDir() {
+			return true
+		}
+	}
+	return false
+}
+
+func gtkThemeDirs() []string {
+	var dirs []string
+	if home, err := os.UserHomeDir(); err == nil {
+		dirs = append(dirs, filepath.Join(home, ".themes"))
+	}
+	if dataHome := os.Getenv("XDG_DATA_HOME"); dataHome != "" {
+		dirs = append(dirs, filepath.Join(dataHome, "themes"))
+	} else if home, err := os.UserHomeDir(); err == nil {
+		dirs = append(dirs, filepath.Join(home, ".local", "share", "themes"))
+	}
+	dataDirs := os.Getenv("XDG_DATA_DIRS")
+	if dataDirs == "" {
+		dataDirs = "/usr/local/share:/usr/share"
+	}
+	for _, dir := range strings.Split(dataDirs, ":") {
+		if dir != "" {
+			dirs = append(dirs, filepath.Join(dir, "themes"))
+		}
+	}
+	return dirs
+}