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import SwiftUI
// MARK: - Theme & Density Types
enum AppTheme: String, CaseIterable, Identifiable {
case system
case light
case dark
case amoled
var id: String { rawValue }
var label: String {
switch self {
case .system: "System"
case .light: "Light"
case .dark: "Dark"
case .amoled: "AMOLED"
}
}
var colorScheme: ColorScheme? {
switch self {
case .system: nil
case .light: .light
case .dark: .dark
case .amoled: .dark
}
}
}
enum DisplayDensity: String, CaseIterable, Identifiable {
case standard
case compact
var id: String { rawValue }
var label: String {
switch self {
case .standard: "Standard"
case .compact: "Compact"
}
}
}
// MARK: - Environment Keys
private struct DisplayDensityKey: EnvironmentKey {
static let defaultValue: DisplayDensity = .standard
}
private struct IsAMOLEDThemeKey: EnvironmentKey {
static let defaultValue: Bool = false
}
extension EnvironmentValues {
var displayDensity: DisplayDensity {
get { self[DisplayDensityKey.self] }
set { self[DisplayDensityKey.self] = newValue }
}
var isAMOLEDTheme: Bool {
get { self[IsAMOLEDThemeKey.self] }
set { self[IsAMOLEDThemeKey.self] = newValue }
}
}
// MARK: - Themed List Modifier
/// Combined modifier for List/Form that applies compact section spacing and AMOLED black backgrounds.
/// Apply once per List or Form.
struct ThemedListStyle: ViewModifier {
@Environment(\.displayDensity) private var density
@Environment(\.isAMOLEDTheme) private var isAMOLED
func body(content: Content) -> some View {
content
.listSectionSpacing(density == .compact ? .compact : .default)
.contentMargins(.vertical, density == .compact ? 2 : 8, for: .scrollContent)
.controlSize(density == .compact ? .small : .regular)
.modifier(AMOLEDListBackground(isAMOLED: isAMOLED))
}
}
/// Hides the default grouped list background and replaces it with true black for OLED screens.
private struct AMOLEDListBackground: ViewModifier {
let isAMOLED: Bool
func body(content: Content) -> some View {
if isAMOLED {
content
.scrollContentBackground(.hidden)
.background(Color.black)
} else {
content
}
}
}
extension View {
/// Apply themed appearance (density spacing) to a List or Form.
func themedList() -> some View {
modifier(ThemedListStyle())
}
}
// MARK: - Themed Row Modifier
struct ThemedRowStyle: ViewModifier {
@Environment(\.isAMOLEDTheme) private var isAMOLED
func body(content: Content) -> some View {
content
.listRowBackground(isAMOLED ? Color.black : nil)
}
}
extension View {
/// Apply to each row view inside a List or Form section to get a true-black background in AMOLED mode.
func themedRow() -> some View {
modifier(ThemedRowStyle())
}
}
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