133 lines
4.2 KiB
Swift
133 lines
4.2 KiB
Swift
//
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// ComboRow.swift
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// Adwaita
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//
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// Created by david-swift on 04.01.24.
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//
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import Libadwaita
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/// A row for selecting an element out of a list of elements.
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public struct ComboRow<Element>: Widget
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where Element: CustomStringConvertible, Element: Identifiable, Element: Equatable {
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/// The title.
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var title: String
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/// The selected element.
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@Binding var selection: Element.ID
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/// The content.
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var content: [Element]
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/// The subtitle.
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var subtitle = ""
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/// The prefix.
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var prefix: Body = []
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/// The suffix.
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var suffix: Body = []
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/// The identifier for the prefix content.
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let prefixID = "prefix"
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/// The identifier for the suffix content.
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let suffixID = "suffix"
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/// The identifier for the elements.
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let elementsID = "elements"
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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(_ title: String, selection: Binding<Element.ID>, values: [Element]) {
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self.title = title
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self._selection = selection
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content = values
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}
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/// Update a view storage.
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/// - Parameters:
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/// - storage: The view storage.
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/// - modifiers: Modify views before being updated.
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public func update(_ storage: ViewStorage, modifiers: [(View) -> View]) {
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if let row = storage.view as? Libadwaita.ComboRow {
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update(row: row)
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}
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if let prefixStorage = storage.content[prefixID]?.first {
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prefix.widget(modifiers: modifiers).update(prefixStorage, modifiers: modifiers)
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}
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if let suffixStorage = storage.content[suffixID]?.first {
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suffix.widget(modifiers: modifiers).update(suffixStorage, modifiers: modifiers)
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}
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}
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/// Get a view storage.
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/// - Parameter modifiers: Modify views before being updated.
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/// - Returns: The view storage.
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public func container(modifiers: [(View) -> View]) -> ViewStorage {
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let row: Libadwaita.ComboRow = .init(title: title, subtitle: subtitle)
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let prefixContent = prefix.widget(modifiers: modifiers).container(modifiers: modifiers)
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let suffixContent = suffix.widget(modifiers: modifiers).container(modifiers: modifiers)
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if !prefix.isEmpty {
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_ = row.addPrefix(prefixContent.view)
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}
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if !suffix.isEmpty {
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_ = row.addSuffix(suffixContent.view)
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}
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update(row: row)
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_ = row.onChange {
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if let element = content.first(where: { $0.description == row.selected() }) {
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selection = element.id
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}
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}
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return .init(row, content: [prefixID: [prefixContent], suffixID: [suffixContent]])
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}
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/// Update the combo row.
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/// - Parameter row: The combo row.
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func update(row: Libadwaita.ComboRow) {
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_ = row.title(title)
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_ = row.subtitle(subtitle)
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let oldElements = row.fields[elementsID] as? [Element] ?? []
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if oldElements != content {
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for element in oldElements {
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row.remove(at: 0)
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}
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for element in content {
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row.append(element.description)
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}
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}
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let index = content.firstIndex { $0.id == selection } ?? 0
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if row.selected() != content[safe: index]?.description {
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row.select(at: index)
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}
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row.fields[elementsID] = content
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}
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/// Set the combo row's subtitle.
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/// - Parameter subtitle: The subtitle.
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/// - Returns: The combo row.
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public func subtitle(_ subtitle: String) -> Self {
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var newSelf = self
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newSelf.subtitle = subtitle
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return newSelf
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}
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/// Set the combo row's prefix view.
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/// - Parameter prefix: The prefix.
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/// - Returns: The combo row.
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public func prefix(@ViewBuilder _ prefix: @escaping () -> Body) -> Self {
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var newSelf = self
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newSelf.prefix = prefix()
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return newSelf
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}
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/// Set the combo row's suffix view.
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/// - Parameter suffix: The suffix.
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/// - Returns: The combo row.
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public func suffix(@ViewBuilder _ suffix: @escaping () -> Body) -> Self {
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var newSelf = self
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newSelf.suffix = suffix()
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return newSelf
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}
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}
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