114 lines
3.8 KiB
Swift
114 lines
3.8 KiB
Swift
//
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// HeaderBar.swift
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// Adwaita
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//
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// Created by david-swift on 23.08.23.
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//
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import Libadwaita
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/// A header bar widget.
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public struct HeaderBar: Widget {
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/// The start content of the header bar.
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var start: Body
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/// The end content of the header bar.
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var end: Body
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/// Whether the title buttons are visible.
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var titleButtons: Bool
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/// The view acting as the title of the header bar.
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var headerBarTitle: Body?
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/// The start content's id.
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let startID = "start"
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/// The end content's id.
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let endID = "end"
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/// The title's id.
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let titleID = "title"
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/// Initialize a header bar.
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/// - Parameters:
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/// - titleButtons: Whether the title buttons (e.g. close button) are visible.
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/// - start: The start content.
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/// - end: The end content.
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public init(titleButtons: Bool = true, @ViewBuilder start: () -> Body, @ViewBuilder end: () -> Body) {
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self.titleButtons = titleButtons
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self.start = start()
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self.end = end()
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}
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/// Initialize an empty header bar.
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/// - Returns: The header bar.
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public static func empty() -> Self {
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.init(start: { }, end: { })
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}
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/// Initialize a header bar with only views at the start.
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/// - Parameter start: The views.
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/// - Returns: The header bar.
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public static func start(@ViewBuilder start: () -> Body) -> Self {
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.init(start: start) { }
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}
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/// Initialize a header bar with only views at the end.
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/// - Parameter start: The views.
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/// - Returns: The header bar.
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public static func end(@ViewBuilder end: () -> Body) -> Self {
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.init(start: { }, end: end)
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}
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/// Update a header bar'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 bar = storage.view as? Libadwaita.HeaderBar {
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_ = bar.showTitleButtons(titleButtons)
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}
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start.update(storage.content[startID] ?? [], modifiers: modifiers)
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end.update(storage.content[endID] ?? [], modifiers: modifiers)
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if let first = storage.content[titleID]?.first {
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headerBarTitle?.widget(modifiers: modifiers).update(first, modifiers: modifiers)
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}
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}
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/// Get the container for a header bar.
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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 bar: Libadwaita.HeaderBar = .init()
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var startContent: [ViewStorage] = []
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var endContent: [ViewStorage] = []
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for element in start {
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let element = element.storage(modifiers: modifiers)
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_ = bar.packStart(element.view)
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startContent.append(element)
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}
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for element in end {
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let element = element.storage(modifiers: modifiers)
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_ = bar.packEnd(element.view)
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endContent.append(element)
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}
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let title = headerBarTitle?.widget(modifiers: modifiers).container(modifiers: modifiers)
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let titleStorage: [ViewStorage]
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if let title {
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_ = bar.titleWidget(title.view)
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titleStorage = [title]
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} else {
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titleStorage = []
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}
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_ = bar.showTitleButtons(titleButtons)
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return .init(bar, content: [startID: startContent, endID: endContent, titleID: titleStorage])
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}
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/// Set the title widget for the header bar.
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/// - Parameter view: The widget in the header bar.
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/// - Returns: The header bar.
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public func headerBarTitle(@ViewBuilder view: () -> Body) -> Self {
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var newSelf = self
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newSelf.headerBarTitle = view()
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return newSelf
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}
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}
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