mastodon-ios/Mastodon/Diffiable/Section/Compose/CustomEmojiPickerSection.swift

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//
// CustomEmojiPickerSection.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-3-24.
//
import UIKit
enum CustomEmojiPickerSection: Equatable, Hashable {
case emoji(name: String)
}
extension CustomEmojiPickerSection {
static func collectionViewDiffableDataSource(
for collectionView: UICollectionView,
dependency: NeedsDependency
) -> UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem> {
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let dataSource = UICollectionViewDiffableDataSource<CustomEmojiPickerSection, CustomEmojiPickerItem>(collectionView: collectionView) { [weak dependency] collectionView, indexPath, item -> UICollectionViewCell? in
guard let _ = dependency else { return nil }
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switch item {
case .emoji(let attribute):
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: CustomEmojiPickerItemCollectionViewCell.self), for: indexPath) as! CustomEmojiPickerItemCollectionViewCell
let placeholder = UIImage.placeholder(size: CustomEmojiPickerItemCollectionViewCell.itemSize, color: .systemFill)
.af.imageRounded(withCornerRadius: 4)
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let isAnimated = !UserDefaults.shared.preferredStaticEmoji
let url = URL(string: isAnimated ? attribute.emoji.url : attribute.emoji.staticURL)
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cell.emojiImageView.sd_setImage(
with: url,
placeholderImage: placeholder,
options: [],
context: nil
)
cell.accessibilityLabel = attribute.emoji.shortcode
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return cell
}
}
dataSource.supplementaryViewProvider = { [weak dataSource] collectionView, kind, indexPath -> UICollectionReusableView? in
guard let dataSource = dataSource else { return nil }
let sections = dataSource.snapshot().sectionIdentifiers
guard indexPath.section < sections.count else { return nil }
let section = sections[indexPath.section]
switch kind {
case String(describing: CustomEmojiPickerHeaderCollectionReusableView.self):
let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: String(describing: CustomEmojiPickerHeaderCollectionReusableView.self), for: indexPath) as! CustomEmojiPickerHeaderCollectionReusableView
switch section {
case .emoji(let name):
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header.titleLabel.text = name
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}
return header
default:
assertionFailure()
return nil
}
}
return dataSource
}
}