Add support for ID subscripts

Sources/Adwaita/Model/Data Flow/Binding.swift

@@ -111,3 +111,38 @@ public struct Binding<Value> {
  }
 
 }
+
+extension Binding where Value: MutableCollection {
+
+ /// Get a child at a certain index of the array as a binding.
+ /// - Parameters:
+ /// - index: The child's index.
+ /// - defaultValue: The value used if the index is out of range does not exist.
+ /// - Returns: The child as a binding.
+ public subscript(safe index: Value.Index?, default defaultValue: Value.Element) -> Binding<Value.Element> {
+ .init {
+ if let index, wrappedValue.indices.contains(index) {
+ return wrappedValue[index] ?? defaultValue
+ }
+ return defaultValue
+ } set: { newValue in
+ if let index, wrappedValue.indices.contains(index) {
+ wrappedValue[index] = newValue
+ }
+ }
+ }
+
+}
+
+extension Binding where Value: MutableCollection, Value.Element: Identifiable {
+
+ /// Get a child of the array with a certain id as a binding.
+ /// - Parameters:
+ /// - id: The child's id.
+ /// - defaultValue: The value used if the index is out of range does not exist.
+ /// - Returns: The child as a binding.
+ public subscript(id id: Value.Element.ID?, default defaultValue: Value.Element) -> Binding<Value.Element> {
+ self[safe: wrappedValue.firstIndex { $0.id == id }, default: defaultValue]
+ }
+
+}

Sources/Adwaita/Model/Extensions/Array.swift

@@ -105,24 +105,19 @@ extension Array {
 
 }
 
-extension Binding where Value: MutableCollection {
+extension Array where Element: Identifiable {
 
- /// Get a child at a certain index of the array as a binding.
+ /// Accesses the element with a certain id safely.
  /// - Parameters:
- /// - index: The child's index.
- /// - defaultValue: The value used if the index is out of range does not exist.
- /// - Returns: The child as a binding.
- public subscript(safe index: Value.Index?, default defaultValue: Value.Element) -> Binding<Value.Element> {
- .init {
- if let index, wrappedValue.indices.contains(index) {
- return wrappedValue[index] ?? defaultValue
- }
- return defaultValue
- } set: { newValue in
- if let index, wrappedValue.indices.contains(index) {
- wrappedValue[index] = newValue
- }
- }
+ /// - id: The child's id.
+ ///
+ /// Access and set elements the safe way:
+ /// ```swift
+ /// var array = ["Hello", "World"]
+ /// print(array[safe: 2] ?? "Out of range")
+ /// ```
+ public subscript(id id: Element.ID) -> Element? {
+ self[safe: firstIndex { $0.id == id }]
  }
 
 }