forked from zelo72/mastodon-ios
111 lines
4.2 KiB
Swift
111 lines
4.2 KiB
Swift
//
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// PickServerCategoriesCell.swift
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// Mastodon
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//
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// Created by BradGao on 2021/2/23.
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//
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import UIKit
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import MastodonSDK
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protocol PickServerCategoriesDataSource: class {
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func numberOfCategories() -> Int
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func category(at index: Int) -> PickServerViewModel.Category
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func selectedIndex() -> Int
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}
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protocol PickServerCategoriesDelegate: class {
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func pickServerCategoriesCell(didSelect index: Int)
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}
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final class PickServerCategoriesCell: UITableViewCell {
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weak var dataSource: PickServerCategoriesDataSource!
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weak var delegate: PickServerCategoriesDelegate!
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let collectionView: UICollectionView = {
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let flowLayout = UICollectionViewFlowLayout()
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flowLayout.scrollDirection = .horizontal
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let view = ControlContainableCollectionView(frame: .zero, collectionViewLayout: flowLayout)
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view.backgroundColor = .clear
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view.showsHorizontalScrollIndicator = false
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view.register(PickServerCategoryCollectionViewCell.self, forCellWithReuseIdentifier: String(describing: PickServerCategoryCollectionViewCell.self))
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view.showsVerticalScrollIndicator = false
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view.translatesAutoresizingMaskIntoConstraints = false
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return view
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}()
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override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
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super.init(style: style, reuseIdentifier: reuseIdentifier)
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_init()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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_init()
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}
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}
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extension PickServerCategoriesCell {
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private func _init() {
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self.selectionStyle = .none
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backgroundColor = .clear
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contentView.addSubview(collectionView)
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NSLayoutConstraint.activate([
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collectionView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
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collectionView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
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collectionView.topAnchor.constraint(equalTo: contentView.topAnchor),
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collectionView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
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collectionView.heightAnchor.constraint(equalToConstant: 80),
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])
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collectionView.delegate = self
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collectionView.dataSource = self
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}
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}
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extension PickServerCategoriesCell: UICollectionViewDelegateFlowLayout {
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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collectionView.selectItem(at: indexPath, animated: true, scrollPosition: .centeredHorizontally)
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delegate.pickServerCategoriesCell(didSelect: indexPath.row)
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}
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
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return UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)
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}
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
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return 16
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}
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
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return CGSize(width: 60, height: 80)
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}
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}
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extension PickServerCategoriesCell: UICollectionViewDataSource {
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func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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return dataSource.numberOfCategories()
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}
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func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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let category = dataSource.category(at: indexPath.row)
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: PickServerCategoryCollectionViewCell.self), for: indexPath) as! PickServerCategoryCollectionViewCell
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cell.category = category
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// Select the default category by default
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if indexPath.row == dataSource.selectedIndex() {
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// Use `[]` as the scrollPosition to avoid contentOffset change
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collectionView.selectItem(at: indexPath, animated: false, scrollPosition: [])
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cell.isSelected = true
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}
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return cell
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}
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}
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