96 lines
3.1 KiB
Swift
96 lines
3.1 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 CAdw
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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 = ViewStorage(.init(adw_view_switcher_new()))
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let stack = ViewStorage(.init(adw_view_stack_new()))
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adw_view_switcher_set_stack(switcher.pointer, stack.pointer)
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for option in Element.allCases {
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adw_view_stack_add_titled_with_icon(
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stack.pointer,
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gtk_label_new(""),
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option.title,
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option.title,
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option.icon.string
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)
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}
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stack.notify(name: "visible-child") {
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if let title = adw_view_stack_get_visible_child_name(stack.pointer),
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let option = Element(title: .init(cString: title)) {
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selection = option
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}
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}
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updateSwitcher(switcher: switcher)
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switcher.fields["stack"] = stack
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return 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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/// - updateProperties: Whether to update properties.
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public func update(_ storage: ViewStorage, modifiers: [(View) -> View], updateProperties: Bool) {
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updateSwitcher(switcher: storage)
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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: ViewStorage) {
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adw_view_switcher_set_policy(
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switcher.pointer,
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wide ? ADW_VIEW_SWITCHER_POLICY_WIDE : ADW_VIEW_SWITCHER_POLICY_NARROW
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)
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let stack = adw_view_switcher_get_stack(switcher.pointer)
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adw_view_stack_set_visible_child_name(stack, 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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