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DiffableDataSource.CollectionView implementation
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John Estropia
291
Sources/DiffableDataSource.CollectionView.swift
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291
Sources/DiffableDataSource.CollectionView.swift
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//
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// DiffableDataSource.CollectionView.swift
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// CoreStore
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//
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// Copyright © 2018 John Rommel Estropia
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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#if canImport(UIKit)
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import UIKit
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import CoreData
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// MARK: - DiffableDataSource
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extension DiffableDataSource {
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// MARK: - CollectionView
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open class CollectionView<O: DynamicObject>: NSObject, UICollectionViewDataSource {
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// MARK: Public
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public typealias ObjectType = O
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@nonobjc
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public init(collectionView: UICollectionView, dataStack: DataStack, cellProvider: @escaping (UICollectionView, IndexPath, ObjectType) -> UICollectionViewCell?, supplementaryViewProvider: @escaping (UICollectionView, String, IndexPath) -> UICollectionReusableView? = { _, _, _ in nil }) {
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self.collectionView = collectionView
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self.cellProvider = cellProvider
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self.supplementaryViewProvider = supplementaryViewProvider
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self.dataStack = dataStack
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super.init()
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// self.rawDataSource = UITableViewDiffableDataSource<String, O.ObjectID>(
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// tableView: tableView,
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// cellProvider: { [weak self] (tableView, indexPath, objectID) -> UITableViewCell? in
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//
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// guard let self = self else {
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//
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// return nil
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// }
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// guard let object = self.dataStack.fetchExisting(objectID) as O? else {
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//
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// return nil
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// }
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// return self.cellProvider(tableView, indexPath, object)
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// }
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// )
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// }
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// else {
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self.rawDataSource = Internals.DiffableDataUIDispatcher<O>(dataStack: dataStack)
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// }
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collectionView.dataSource = self
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}
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public func apply(_ snapshot: ListSnapshot<ObjectType>, animatingDifferences: Bool = true) {
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let diffableSnapshot = snapshot.diffableSnapshot
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// self.modernDataSource.apply(
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// diffableSnapshot as! NSDiffableDataSourceSnapshot<String, NSManagedObjectID>,
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// animatingDifferences: animatingDifferences,
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// completion: nil
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// )
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// }
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// else {
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self.legacyDataSource.apply(
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diffableSnapshot as! Internals.DiffableDataSourceSnapshot,
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view: self.collectionView,
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animatingDifferences: animatingDifferences,
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performUpdates: { collectionView, changeset, setSections in
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collectionView.reload(
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using: changeset,
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setData: setSections
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)
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}
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)
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// }
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}
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public func itemIdentifier(for indexPath: IndexPath) -> O.ObjectID? {
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// return self.modernDataSource.itemIdentifier(for: indexPath)
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// }
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// else {
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return self.legacyDataSource.itemIdentifier(for: indexPath)
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// }
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}
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public func indexPath(for itemIdentifier: O.ObjectID) -> IndexPath? {
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// return self.modernDataSource.indexPath(for: itemIdentifier)
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// }
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// else {
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return self.legacyDataSource.indexPath(for: itemIdentifier)
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// }
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}
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// MARK: - UICollectionViewDataSource
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@objc
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public dynamic func numberOfSections(in collectionView: UICollectionView) -> Int {
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// return self.modernDataSource.numberOfSections(in: tableView)
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// }
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// else {
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return self.legacyDataSource.numberOfSections()
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// }
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}
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@objc
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public dynamic func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// return self.modernDataSource.tableView(tableView, numberOfRowsInSection: section)
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// }
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// else {
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return self.legacyDataSource.numberOfItems(inSection: section)
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// }
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}
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@objc
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open dynamic func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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// if #available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *) {
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//
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// return self.modernDataSource.tableView(tableView, cellForRowAt: indexPath)
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// }
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// else {
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guard let objectID = self.legacyDataSource.itemIdentifier(for: indexPath) else {
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Internals.abort("Object at \(Internals.typeName(IndexPath.self)) \(indexPath) already removed from list")
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}
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guard let object = self.dataStack.fetchExisting(objectID) as O? else {
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Internals.abort("Object at \(Internals.typeName(IndexPath.self)) \(indexPath) has been deleted")
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}
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guard let cell = self.cellProvider(collectionView, indexPath, object) else {
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Internals.abort("\(Internals.typeName(UICollectionViewDataSource.self)) returned a `nil` cell for \(Internals.typeName(IndexPath.self)) \(indexPath)")
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}
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return cell
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// }
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}
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@objc
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open dynamic func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
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guard let view = self.supplementaryViewProvider(collectionView, kind, indexPath) else {
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return UICollectionReusableView()
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}
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return view
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}
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// MARK: Private
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private weak var collectionView: UICollectionView?
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private let dataStack: DataStack
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private let cellProvider: (UICollectionView, IndexPath, ObjectType) -> UICollectionViewCell?
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private let supplementaryViewProvider: (UICollectionView, String, IndexPath) -> UICollectionReusableView?
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private var rawDataSource: Any!
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// @available(iOS 13.0, tvOS 13.0, watchOS 6.0, macOS 10.15, *)
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// private var modernDataSource: UITableViewDiffableDataSource<String, O.ObjectID> {
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//
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// return self.rawDataSource as! UITableViewDiffableDataSource<String, O.ObjectID>
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// }
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private var legacyDataSource: Internals.DiffableDataUIDispatcher<O> {
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return self.rawDataSource as! Internals.DiffableDataUIDispatcher<O>
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}
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}
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}
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// MARK: - UICollectionView
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extension UICollectionView {
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// MARK: FilePrivate
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@nonobjc
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fileprivate func reload<C, O>(
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using stagedChangeset: Internals.DiffableDataUIDispatcher<O>.StagedChangeset<C>,
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interrupt: ((Internals.DiffableDataUIDispatcher<O>.Changeset<C>) -> Bool)? = nil,
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setData: (C) -> Void
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) {
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if case .none = window, let data = stagedChangeset.last?.data {
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setData(data)
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self.reloadData()
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return
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}
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for changeset in stagedChangeset {
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if let interrupt = interrupt, interrupt(changeset), let data = stagedChangeset.last?.data {
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setData(data)
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self.reloadData()
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return
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}
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self.performBatchUpdates(
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{
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setData(changeset.data)
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if !changeset.sectionDeleted.isEmpty {
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self.deleteSections(IndexSet(changeset.sectionDeleted))
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}
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if !changeset.sectionInserted.isEmpty {
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self.insertSections(IndexSet(changeset.sectionInserted))
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}
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if !changeset.sectionUpdated.isEmpty {
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self.reloadSections(IndexSet(changeset.sectionUpdated))
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}
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for (source, target) in changeset.sectionMoved {
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self.moveSection(source, toSection: target)
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}
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if !changeset.elementDeleted.isEmpty {
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self.deleteItems(at: changeset.elementDeleted.map { IndexPath(row: $0.element, section: $0.section) })
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}
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if !changeset.elementInserted.isEmpty {
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self.insertItems(at: changeset.elementInserted.map { IndexPath(row: $0.element, section: $0.section) })
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}
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if !changeset.elementUpdated.isEmpty {
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self.reloadItems(at: changeset.elementUpdated.map { IndexPath(row: $0.element, section: $0.section) })
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}
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for (source, target) in changeset.elementMoved {
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self.moveItem(at: IndexPath(row: source.element, section: source.section), to: IndexPath(row: target.element, section: target.section))
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}
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},
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completion: nil
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)
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}
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}
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}
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#endif
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