mastodon-ios/Mastodon/Diffiable/DataSource/TableNodeDiffableDataSource...

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//
// TableNodeDiffableDataSource.swift
// Mastodon
//
// Created by Cirno MainasuK on 2021-6-19.
//
2021-06-22 07:41:40 +02:00
#if ASDK
import UIKit
import AsyncDisplayKit
import DiffableDataSources
open class TableNodeDiffableDataSource<SectionIdentifierType: Hashable, ItemIdentifierType: Hashable>: NSObject, ASTableDataSource {
/// The type of closure providing the cell.
public typealias CellProvider = (ASTableNode, IndexPath, ItemIdentifierType) -> ASCellNodeBlock?
/// The default animation to updating the views.
public var defaultRowAnimation: UITableView.RowAnimation = .automatic
private weak var tableNode: ASTableNode?
private let cellProvider: CellProvider
private let core = DiffableDataSourceCore<SectionIdentifierType, ItemIdentifierType>()
/// Creates a new data source.
///
/// - Parameters:
/// - tableView: A table view instance to be managed.
/// - cellProvider: A closure to dequeue the cell for rows.
public init(tableNode: ASTableNode, cellProvider: @escaping CellProvider) {
self.tableNode = tableNode
self.cellProvider = cellProvider
super.init()
tableNode.dataSource = self
}
/// Applies given snapshot to perform automatic diffing update.
///
/// - Parameters:
/// - snapshot: A snapshot object to be applied to data model.
/// - animatingDifferences: A Boolean value indicating whether to update with
/// diffing animation.
/// - completion: An optional completion block which is called when the complete
/// performing updates.
public func apply(_ snapshot: DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType>, animatingDifferences: Bool = true, completion: (() -> Void)? = nil) {
core.apply(snapshot, view: tableNode, animatingDifferences: animatingDifferences, completion: completion)
}
/// Returns a new snapshot object of current state.
///
/// - Returns: A new snapshot object of current state.
public func snapshot() -> DiffableDataSourceSnapshot<SectionIdentifierType, ItemIdentifierType> {
return core.snapshot()
}
/// Returns an item identifier for given index path.
///
/// - Parameters:
/// - indexPath: An index path for the item identifier.
///
/// - Returns: An item identifier for given index path.
public func itemIdentifier(for indexPath: IndexPath) -> ItemIdentifierType? {
return core.itemIdentifier(for: indexPath)
}
/// Returns an index path for given item identifier.
///
/// - Parameters:
/// - itemIdentifier: An identifier of item.
///
/// - Returns: An index path for given item identifier.
public func indexPath(for itemIdentifier: ItemIdentifierType) -> IndexPath? {
return core.indexPath(for: itemIdentifier)
}
/// Returns the number of sections in the data source.
///
/// - Parameters:
/// - tableNode: A table node instance managed by `self`.
///
/// - Returns: The number of sections in the data source.
public func numberOfSections(in tableNode: ASTableNode) -> Int {
return core.numberOfSections()
}
/// Returns the number of items in the specified section.
///
/// - Parameters:
/// - tableNode: A table node instance managed by `self`.
/// - section: An index of section.
///
/// - Returns: The number of items in the specified section.
public func tableNode(_ tableNode: ASTableNode, numberOfRowsInSection section: Int) -> Int {
return core.numberOfItems(inSection: section)
}
/// Returns a cell for row at specified index path.
///
/// - Parameters:
/// - tableView: A table view instance managed by `self`.
/// - indexPath: An index path for cell.
///
/// - Returns: A cell for row at specified index path.
open func tableNode(_ tableNode: ASTableNode, nodeBlockForRowAt indexPath: IndexPath) -> ASCellNodeBlock {
let itemIdentifier = core.unsafeItemIdentifier(for: indexPath)
guard let block = cellProvider(tableNode, indexPath, itemIdentifier) else {
fatalError("UITableView dataSource returned a nil cell for row at index path: \(indexPath), tableNode: \(tableNode), itemIdentifier: \(itemIdentifier)")
}
return block
}
}
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#endif