84 lines
2.6 KiB
Swift
84 lines
2.6 KiB
Swift
//
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// ViewSwitcher.swift
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// Adwaita
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//
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// Created by david-swift on 03.01.24.
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//
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import Libadwaita
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/// A picker used for indicating multiple views.
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///
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/// It normally controls a `ViewStack` (e.g. via `switch` statements).
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public struct ViewSwitcher<Element>: Widget where Element: ViewSwitcherOption {
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/// The selected element.
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@Binding var selection: Element
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/// Whether the wide style is used, that means the icons and titles are on the same line.
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var wide = false
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/// Initialize a view switcher.
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/// - Parameter selection: The selected element.
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public init(selection: Binding<Element>) {
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self._selection = selection
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}
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/// Get a view switcher's 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 switcher = Libadwaita.ViewSwitcher()
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for option in Element.allCases {
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_ = switcher.addOption(title: option.title, icon: option.icon)
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}
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_ = switcher.onSelect {
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let selection = switcher.getSelection()
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if let element = Element(title: selection) {
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self.selection = element
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}
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}
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updateSwitcher(switcher: switcher)
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return .init(switcher)
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}
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/// Update a view switcher's 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 switcher = storage.view as? Libadwaita.ViewSwitcher {
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updateSwitcher(switcher: switcher)
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}
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}
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/// Update a view switcher's style and selection.
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/// - Parameter switcher: The view switcher.
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func updateSwitcher(switcher: Libadwaita.ViewSwitcher) {
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_ = switcher.wideDesign(wide)
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switcher.select(title: selection.title)
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}
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/// Set whether to use the wide design.
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/// - Parameter wide: Whether to use the wide design.
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/// - Returns: The view switcher.
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public func wideDesign(_ wide: Bool = true) -> Self {
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var newSelf = self
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newSelf.wide = wide
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return newSelf
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}
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}
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/// The protocol an element type for view switcher has to conform to.
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public protocol ViewSwitcherOption: CaseIterable {
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/// The title displayed in the switcher and used for identification.
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var title: String { get }
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/// A symbolic representation in the view switcher.
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var icon: Icon { get }
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/// Get the element from the title.
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init?(title: String)
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}
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