76 lines
1.7 KiB
Swift
76 lines
1.7 KiB
Swift
//
|
|
// State.swift
|
|
// Adwaita
|
|
//
|
|
// Created by david-swift on 06.08.23.
|
|
//
|
|
|
|
/// A property wrapper for properties in a view that should be stored throughout view updates.
|
|
@propertyWrapper
|
|
public struct State<Value>: StateProtocol {
|
|
|
|
/// Access the stored value. This updates the views when being changed.
|
|
public var wrappedValue: Value {
|
|
get {
|
|
storage.value
|
|
}
|
|
nonmutating set {
|
|
storage.value = newValue
|
|
Self.updateViews()
|
|
}
|
|
}
|
|
|
|
/// Get the value as a binding using the `$` prefix.
|
|
public var projectedValue: Binding<Value> {
|
|
.init {
|
|
wrappedValue
|
|
} set: { newValue in
|
|
self.wrappedValue = newValue
|
|
}
|
|
}
|
|
|
|
/// The stored value.
|
|
private let storage: Storage<Value>
|
|
/// The value with an erased type.
|
|
public var value: Any {
|
|
get {
|
|
wrappedValue
|
|
}
|
|
nonmutating set {
|
|
if let newValue = newValue as? Value {
|
|
storage.value = newValue
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Initialize a property representing a state in the view.
|
|
/// - Parameters:
|
|
/// - wrappedValue: The wrapped value.
|
|
public init(wrappedValue: Value) {
|
|
storage = .init(value: wrappedValue)
|
|
}
|
|
|
|
/// A class storing the value.
|
|
class Storage<StoredValue> {
|
|
|
|
/// The stored value.
|
|
var value: StoredValue
|
|
|
|
/// Initialize the storage.
|
|
/// - Parameters:
|
|
/// - value: The value.
|
|
init(value: StoredValue) {
|
|
self.value = value
|
|
}
|
|
|
|
}
|
|
|
|
/// Update all of the views.
|
|
public static func updateViews() {
|
|
for handler in GTUIApp.updateHandlers {
|
|
handler()
|
|
}
|
|
}
|
|
|
|
}
|