85 lines
2.8 KiB
Swift
85 lines
2.8 KiB
Swift
//
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// DropDown+.swift
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// Adwaita
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//
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// Created by david-swift on 09.04.25.
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//
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import CAdw
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import LevenshteinTransformations
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extension DropDown {
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/// The identifier for the values.
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static var values: String { "values" }
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/// The identifier for the string list.
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static var stringList: String { "string-list" }
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/// Initialize a combo row.
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/// - Parameters:
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/// - selection: The selected value.
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/// - values: The available values.
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public init<Element>(
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selection: Binding<Element.ID>,
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values: [Element]
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) where Element: Identifiable, Element: CustomStringConvertible {
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self.init(selection: selection, values: values, id: \.id, description: \.description)
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}
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/// Initialize a combo row.
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/// - Parameters:
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/// - title: The row's title.
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/// - selection: The selected value.
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/// - values: The available values.
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public init<Element, Identifier>(
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selection: Binding<Identifier>,
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values: [Element],
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id: KeyPath<Element, Identifier>,
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description: KeyPath<Element, String>
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) where Identifier: Equatable {
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self.init()
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self = self.selected(.init {
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.init(values.firstIndex { $0[keyPath: id] == selection.wrappedValue } ?? 0)
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} set: { index in
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if let id = values[safe: .init(index)]?[keyPath: id] {
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selection.wrappedValue = id
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}
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})
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appearFunctions.append { storage, _ in
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storage.fields[Self.stringList] = gtk_drop_down_get_model(storage.opaquePointer)
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Self.updateContent(storage: storage, values: values, id: id, description: description)
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}
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updateFunctions.append { storage, _, _ in
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Self.updateContent(storage: storage, values: values, id: id, description: description)
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}
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}
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/// Update the combo row's content.
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/// - Parameters:
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/// - storage: The view storage.
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/// - values: The elements.
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/// - id: The keypath to the id.
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/// - description: The keypath to the description.
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static func updateContent<Element, Identifier>(
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storage: ViewStorage,
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values: [Element],
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id: KeyPath<Element, Identifier>,
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description: KeyPath<Element, String>
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) where Identifier: Equatable {
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if let list = storage.fields[Self.stringList] as? OpaquePointer {
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let old = storage.fields[Self.values] as? [Element] ?? []
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old.transform(
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to: values,
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id: id,
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functions: .init { index in
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gtk_string_list_remove(list, .init(index))
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} insert: { _, element in
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gtk_string_list_append(list, element[keyPath: description])
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}
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)
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storage.fields[Self.values] = values
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}
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}
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}
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