132 lines
3.7 KiB
Swift
132 lines
3.7 KiB
Swift
//
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// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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@objc
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public class StickerHorizontalListViewItem: NSObject {
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let stickerInfo: StickerInfo
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let selectedBlock: () -> Void
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@objc
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public init(stickerInfo: StickerInfo, selectedBlock: @escaping () -> Void) {
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self.stickerInfo = stickerInfo
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self.selectedBlock = selectedBlock
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}
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}
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// MARK: -
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@objc
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public class StickerHorizontalListView: UICollectionView {
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private let cellSize: CGFloat
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public typealias Item = StickerHorizontalListViewItem
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@objc
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public var items = [Item]() {
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didSet {
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AssertIsOnMainThread()
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collectionViewLayout.invalidateLayout()
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reloadData()
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}
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}
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private let cellReuseIdentifier = "cellReuseIdentifier"
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@objc
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public override var contentInset: UIEdgeInsets {
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didSet {
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updateHeightConstraint()
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}
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}
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private var heightConstraint: NSLayoutConstraint?
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@objc
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public required init(cellSize: CGFloat, spacing: CGFloat = 0) {
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self.cellSize = cellSize
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let layout = LinearHorizontalLayout(itemSize: CGSize(width: cellSize, height: cellSize), spacing: spacing)
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super.init(frame: .zero, collectionViewLayout: layout)
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delegate = self
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dataSource = self
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register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellReuseIdentifier)
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setContentHuggingHorizontalLow()
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setCompressionResistanceHorizontalLow()
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heightConstraint = autoSetDimension(.height, toSize: 0)
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updateHeightConstraint()
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}
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private func updateHeightConstraint() {
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guard let heightConstraint = heightConstraint else {
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owsFailDebug("Missing heightConstraint.")
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return
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}
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let newValue = cellSize + contentInset.top + contentInset.bottom
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if heightConstraint.constant == newValue {
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return
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}
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heightConstraint.constant = newValue
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invalidateIntrinsicContentSize()
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}
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required public init(coder: NSCoder) {
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notImplemented()
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}
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}
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// MARK: - UICollectionViewDelegate
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extension StickerHorizontalListView: UICollectionViewDelegate {
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public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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Logger.debug("")
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guard let item = items[safe: indexPath.row] else {
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owsFailDebug("Invalid index path: \(indexPath)")
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return
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}
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item.selectedBlock()
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}
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}
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// MARK: - UICollectionViewDataSource
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extension StickerHorizontalListView: UICollectionViewDataSource {
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public func numberOfSections(in collectionView: UICollectionView) -> Int {
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return 1
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}
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public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection sectionIdx: Int) -> Int {
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return items.count
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}
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public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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// We could eventually use cells that lazy-load the sticker views
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// when the cells becomes visible and eagerly unload them.
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// But we probably won't need to do that.
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellReuseIdentifier, for: indexPath)
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for subview in cell.contentView.subviews {
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subview.removeFromSuperview()
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}
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guard let item = items[safe: indexPath.row] else {
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owsFailDebug("Invalid index path: \(indexPath)")
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return cell
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}
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let stickerView = StickerView(stickerInfo: item.stickerInfo)
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cell.contentView.addSubview(stickerView)
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stickerView.autoPinEdgesToSuperviewEdges()
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return cell
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}
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}
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