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Add support for storing a single item
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| /** | ||
| A `DataSource` that contains a single item. It is backed by a `SingleItemDataStore` | ||
| */ | ||
| open class SingleItemDataSource<Element>: BasicDataSource<SingleItemDataStore<Element>> { | ||
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| /** | ||
| Create a new `SingleItemDataSource` with the provided element | ||
| - parameter element: The element to populate the backing store with | ||
| */ | ||
| public init(element: Element) { | ||
| let store = SingleItemDataStore(element: element) | ||
| super.init(store: store) | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import Foundation | ||
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| /** | ||
| A `DataStore` that contains a single element of type `Element` | ||
| */ | ||
| open class SingleItemDataStore<Element>: DataStore { | ||
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| public let element: Element | ||
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| public weak var delegate: DataStoreDelegate? | ||
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| public weak var dataSource: Composed.DataSource? | ||
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| public let numberOfSections: Int = 1 | ||
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| /** | ||
| Create a new `SingleItemDataStore` with the provided element | ||
| - parameter element: The element to populate the store with | ||
| */ | ||
| public init(element: Element) { | ||
| self.element = element | ||
| } | ||
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| public func numberOfElements(in section: Int) -> Int { | ||
| return 1 | ||
| } | ||
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| public func element(at indexPath: IndexPath) -> Element { | ||
| guard indexPath.item == 0 else { fatalError() } | ||
| return element | ||
| } | ||
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| public func indexPath(where predicate: @escaping (Element) -> Bool) -> IndexPath? { | ||
| return predicate(element) ? IndexPath(item: 0, section: 0) : nil | ||
| } | ||
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| } |