84 lines
2.6 KiB
Swift
84 lines
2.6 KiB
Swift
//
|
|
// Preference.swift
|
|
// TuskerPreferences
|
|
//
|
|
// Created by Shadowfacts on 4/13/24.
|
|
//
|
|
|
|
import Foundation
|
|
import Combine
|
|
|
|
// TODO: once we target iOS 17, use Observable for this
|
|
@propertyWrapper
|
|
final class Preference<Key: PreferenceKey>: Codable {
|
|
@Published private(set) var storedValue: Key.Value?
|
|
|
|
var wrappedValue: Key.Value {
|
|
get {
|
|
storedValue ?? Key.defaultValue
|
|
}
|
|
set {
|
|
fatalError("unreachable")
|
|
}
|
|
}
|
|
|
|
init() {
|
|
self.storedValue = nil
|
|
}
|
|
|
|
init(from decoder: any Decoder) throws {
|
|
if let container = try? decoder.singleValueContainer() {
|
|
self.storedValue = try? container.decode(Key.Value.self)
|
|
}
|
|
}
|
|
|
|
func encode(to encoder: any Encoder) throws {
|
|
if let storedValue {
|
|
var container = encoder.singleValueContainer()
|
|
try container.encode(storedValue)
|
|
}
|
|
}
|
|
|
|
static subscript(
|
|
_enclosingInstance instance: PreferenceStore,
|
|
wrapped wrappedKeyPath: ReferenceWritableKeyPath<PreferenceStore, Key.Value>,
|
|
storage storageKeyPath: ReferenceWritableKeyPath<PreferenceStore, Preference>
|
|
) -> Key.Value {
|
|
get {
|
|
get(enclosingInstance: instance, wrapped: wrappedKeyPath, storage: storageKeyPath)
|
|
}
|
|
set {
|
|
set(enclosingInstance: instance, wrapped: wrappedKeyPath, storage: storageKeyPath, newValue: newValue)
|
|
Key.didSet(in: instance, newValue: newValue)
|
|
}
|
|
}
|
|
|
|
// for testing only
|
|
@inline(__always)
|
|
static func get<Enclosing>(
|
|
enclosingInstance: Enclosing,
|
|
wrapped: ReferenceWritableKeyPath<Enclosing, Key.Value>,
|
|
storage: ReferenceWritableKeyPath<Enclosing, Preference>
|
|
) -> Key.Value where Enclosing: ObservableObject, Enclosing.ObjectWillChangePublisher == ObservableObjectPublisher {
|
|
let pref = enclosingInstance[keyPath: storage]
|
|
return pref.storedValue ?? Key.defaultValue
|
|
}
|
|
|
|
// for testing only
|
|
@inline(__always)
|
|
static func set<Enclosing>(
|
|
enclosingInstance: Enclosing,
|
|
wrapped: ReferenceWritableKeyPath<Enclosing, Key.Value>,
|
|
storage: ReferenceWritableKeyPath<Enclosing, Preference>,
|
|
newValue: Key.Value
|
|
) where Enclosing: ObservableObject, Enclosing.ObjectWillChangePublisher == ObservableObjectPublisher {
|
|
enclosingInstance.objectWillChange.send()
|
|
let pref = enclosingInstance[keyPath: storage]
|
|
pref.storedValue = newValue
|
|
}
|
|
|
|
var projectedValue: some Publisher<Key.Value, Never> {
|
|
$storedValue.map { $0 ?? Key.defaultValue }
|
|
}
|
|
}
|