98 lines
3.4 KiB
Swift
98 lines
3.4 KiB
Swift
//
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// ProfileAboutViewModel+Diffable.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-1-22.
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//
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import UIKit
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import Combine
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import MastodonSDK
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extension ProfileAboutViewModel {
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func setupDiffableDataSource(
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collectionView: UICollectionView,
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profileFieldCollectionViewCellDelegate: ProfileFieldCollectionViewCellDelegate,
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profileFieldEditCollectionViewCellDelegate: ProfileFieldEditCollectionViewCellDelegate
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) {
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let diffableDataSource = ProfileFieldSection.diffableDataSource(
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collectionView: collectionView,
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context: context,
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configuration: ProfileFieldSection.Configuration(
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profileFieldCollectionViewCellDelegate: profileFieldCollectionViewCellDelegate,
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profileFieldEditCollectionViewCellDelegate: profileFieldEditCollectionViewCellDelegate
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)
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)
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self.diffableDataSource = diffableDataSource
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diffableDataSource.reorderingHandlers.canReorderItem = { item -> Bool in
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switch item {
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case .editField: return true
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default: return false
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}
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}
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diffableDataSource.reorderingHandlers.didReorder = { [weak self] transaction in
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guard let self = self else { return }
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let items = transaction.finalSnapshot.itemIdentifiers
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var fields: [ProfileFieldItem.FieldValue] = []
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for item in items {
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guard case let .editField(field) = item else { continue }
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fields.append(field)
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}
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self.profileInfoEditing.fields = fields
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}
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var snapshot = NSDiffableDataSourceSnapshot<ProfileFieldSection, ProfileFieldItem>()
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snapshot.appendSections([.main])
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diffableDataSource.apply(snapshot)
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let fields = Publishers.CombineLatest3(
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$isEditing.removeDuplicates(),
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profileInfo.$fields.removeDuplicates(),
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profileInfoEditing.$fields.removeDuplicates()
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).map { isEditing, displayFields, editingFields in
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isEditing ? editingFields : displayFields
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}
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Publishers.CombineLatest4(
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$isEditing.removeDuplicates(),
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$createdAt.removeDuplicates(),
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fields,
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$emojiMeta.removeDuplicates()
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)
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.throttle(for: 0.3, scheduler: DispatchQueue.main, latest: true)
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.sink { [weak self] isEditing, createdAt, fields, emojiMeta in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<ProfileFieldSection, ProfileFieldItem>()
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snapshot.appendSections([.main])
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var items: [ProfileFieldItem] = [
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.createdAt(date: createdAt),
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] + fields.map { field in
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if isEditing {
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return ProfileFieldItem.editField(field: field)
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} else {
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return ProfileFieldItem.field(field: field)
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}
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}
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if isEditing, fields.count < ProfileHeaderViewModel.maxProfileFieldCount {
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items.append(.addEntry)
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}
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snapshot.appendItems(items, toSection: .main)
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diffableDataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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}
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.store(in: &disposeBag)
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}
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}
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