105 lines
2.4 KiB
Swift
105 lines
2.4 KiB
Swift
//
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// State.swift
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// Adwaita
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//
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// Created by david-swift on 06.08.23.
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//
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import Foundation
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/// A property wrapper for properties in a view that should be stored throughout view updates.
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@propertyWrapper
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public struct State<Value>: StateProtocol {
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/// Access the stored value. This updates the views when being changed.
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public var wrappedValue: Value {
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get {
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rawValue
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}
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nonmutating set {
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rawValue = newValue
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Self.updateViews()
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}
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}
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/// Get the value as a binding using the `$` prefix.
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public var projectedValue: Binding<Value> {
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.init {
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wrappedValue
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} set: { newValue in
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self.wrappedValue = newValue
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}
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}
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// swiftlint:disable force_cast
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/// Get and set the value without updating the views.
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public var rawValue: Value {
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get {
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content.storage.value as! Value
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}
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nonmutating set {
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content.storage.value = newValue
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}
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}
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// swiftlint:enable force_cast
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/// The stored value.
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public let content: State<Any>.Content
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/// The value with an erased type.
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public var value: Any {
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get {
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wrappedValue
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}
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nonmutating set {
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if let newValue = newValue as? Value {
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content.storage.value = newValue
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}
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}
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}
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/// Initialize a property representing a state in the view.
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/// - Parameters:
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/// - wrappedValue: The wrapped value.
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public init(wrappedValue: Value) {
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content = .init(storage: .init(value: wrappedValue))
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}
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/// A class storing the state's content.
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public class Content {
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/// The storage.
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public var storage: Storage
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/// Initialize the content.
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/// - Parameter storage: The storage.
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public init(storage: Storage) {
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self.storage = storage
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}
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}
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/// A class storing the value.
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public class Storage {
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/// The stored value.
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public var value: Any
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/// Initialize the storage.
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/// - Parameters:
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/// - value: The value.
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public init(value: Any) {
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self.value = value
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}
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}
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/// Update all of the views.
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public static func updateViews() {
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for handler in GTUIApp.updateHandlers {
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handler()
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}
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}
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}
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