mirror of
https://github.com/MessageKit/MessageKit.git
synced 2026-02-06 19:03:19 +00:00
Steven Deutsch
110 lines
3.9 KiB
Swift
110 lines
3.9 KiB
Swift
/*
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MIT License
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Copyright (c) 2017-2018 MessageKit
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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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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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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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import UIKit
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open class MessagesCollectionView: UICollectionView {
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// MARK: - Properties
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open weak var messagesDataSource: MessagesDataSource?
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open weak var messagesDisplayDelegate: MessagesDisplayDelegate?
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open weak var messagesLayoutDelegate: MessagesLayoutDelegate?
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open weak var messageCellDelegate: MessageCellDelegate?
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open var showsDateHeaderAfterTimeInterval: TimeInterval = 3600
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private var indexPathForLastItem: IndexPath? {
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let lastSection = numberOfSections - 1
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guard lastSection >= 0, numberOfItems(inSection: lastSection) > 0 else { return nil }
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return IndexPath(item: numberOfItems(inSection: lastSection) - 1, section: lastSection)
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}
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// MARK: - Initializers
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public override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
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super.init(frame: frame, collectionViewLayout: layout)
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backgroundColor = .white
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setupGestureRecognizers()
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}
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required public init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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public convenience init() {
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self.init(frame: .zero, collectionViewLayout: MessagesCollectionViewFlowLayout())
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}
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// MARK: - Methods
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func setupGestureRecognizers() {
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let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTapGesture(_:)))
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tapGesture.delaysTouchesBegan = true
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addGestureRecognizer(tapGesture)
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}
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@objc
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open func handleTapGesture(_ gesture: UIGestureRecognizer) {
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guard gesture.state == .ended else { return }
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let touchLocation = gesture.location(in: self)
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guard let indexPath = indexPathForItem(at: touchLocation) else { return }
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let cell = cellForItem(at: indexPath) as? MessageCollectionViewCell
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cell?.handleTapGesture(gesture)
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}
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public func scrollToBottom(animated: Bool = false) {
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let collectionViewContentHeight = collectionViewLayout.collectionViewContentSize.height
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performBatchUpdates(nil) { _ in
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self.scrollRectToVisible(CGRect(0.0, collectionViewContentHeight - 1.0, 1.0, 1.0), animated: animated)
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}
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}
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public func reloadDataAndKeepOffset() {
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// stop scrolling
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setContentOffset(contentOffset, animated: false)
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// calculate the offset and reloadData
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let beforeContentSize = contentSize
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reloadData()
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layoutIfNeeded()
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let afterContentSize = contentSize
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// reset the contentOffset after data is updated
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let newOffset = CGPoint(
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x: contentOffset.x + (afterContentSize.width - beforeContentSize.width),
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y: contentOffset.y + (afterContentSize.height - beforeContentSize.height))
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setContentOffset(newOffset, animated: false)
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}
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}
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