108 lines
2.8 KiB
Swift
108 lines
2.8 KiB
Swift
import Elementary
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/// The page links under a card grid; renders nothing for a single page.
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struct Pagination: HTML {
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// MARK: Properties
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/// The page shown, counted from one.
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let current: Int
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/// The path of a given page.
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let path: @Sendable (Int) -> String
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/// The number of pages.
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let total: Int
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// MARK: Initializers
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/// Creates the page links.
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/// - Parameters:
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/// - current: the page shown, counted from one.
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/// - total: the number of pages.
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/// - path: the path of a given page.
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init(
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current: Int,
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total: Int,
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path: @escaping @Sendable (Int) -> String
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) {
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self.current = current
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self.path = path
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self.total = total
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}
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// MARK: Computed
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var body: some HTML {
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if total > 1 {
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nav(
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.class("pagination"),
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.custom(
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name: "aria-label",
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value: "Pagination"
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)
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) {
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for page in 1...total {
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if page == current {
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a(
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.class("pagination__page"),
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.href(path(page)),
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.custom(
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name: "aria-current",
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value: "page"
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)
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) {
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"\(page)"
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}
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} else {
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a(
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.class("pagination__page"),
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.href(path(page))
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) {
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"\(page)"
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}
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}
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}
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if current < total {
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a(
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.class("pagination__next"),
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.href(path(current + 1))
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) {
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"Next"
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}
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}
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}
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}
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}
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}
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// MARK: - Extensions
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extension Pagination {
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// MARK: Methods
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/// Cuts the items of one page out of a list, clamping the page to the list's range.
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/// - Parameters:
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/// - items: the whole list.
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/// - page: the page asked for, counted from one.
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/// - size: the number of items on a page.
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/// - Returns: the page's items, the page actually shown, and the number of pages.
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static func slice<Item>(
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_ items: [Item],
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page: Int,
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size: Int
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) -> (items: [Item], current: Int, total: Int) {
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let total = max((items.count + size - 1) / size, 1)
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let current = min(max(page, 1), total)
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return (
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Array(items.dropFirst((current - 1) * size).prefix(size)),
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current,
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total
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)
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}
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}
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