mirror of
https://github.com/MessageKit/MessageKit.git
synced 2026-02-06 19:03:19 +00:00
Steven Deutsch
538 lines
22 KiB
Swift
538 lines
22 KiB
Swift
/*
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MIT License
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Copyright (c) 2017 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 MessagesCollectionViewFlowLayout: UICollectionViewFlowLayout {
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// MARK: - Properties
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open var messageLabelFont: UIFont
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open var messageLabelInsets: UIEdgeInsets
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open var messageToViewEdgePadding: CGFloat
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open var cellTopLabelInsets: UIEdgeInsets
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open var topLabelExtendsPastAvatar: Bool
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open var cellBottomLabelInsets: UIEdgeInsets
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open var bottomLabelExtendsPastAvatar: Bool
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fileprivate var avatarMessagePadding: CGFloat = 4
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fileprivate var messagesCollectionView: MessagesCollectionView? {
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return collectionView as? MessagesCollectionView
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}
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fileprivate var itemWidth: CGFloat {
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guard let collectionView = collectionView else { return 0 }
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return collectionView.frame.width - sectionInset.left - sectionInset.right
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}
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override open class var layoutAttributesClass: AnyClass {
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return MessagesCollectionViewLayoutAttributes.self
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}
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// MARK: - Initializers
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override public init() {
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messageLabelFont = UIFont.preferredFont(forTextStyle: .body)
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messageLabelInsets = UIEdgeInsets(top: 7, left: 14, bottom: 7, right: 14)
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messageToViewEdgePadding = 30.0
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cellTopLabelInsets = .zero
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topLabelExtendsPastAvatar = false
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cellBottomLabelInsets = .zero
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bottomLabelExtendsPastAvatar = false
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super.init()
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sectionInset = UIEdgeInsets(top: 4, left: 8, bottom: 4, right: 8)
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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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// MARK: - Methods
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// MARK: - Layout Attributes
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override open func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
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guard let attributesArray = super.layoutAttributesForElements(in: rect) as? [MessagesCollectionViewLayoutAttributes] else { return nil }
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attributesArray.forEach { attributes in
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if attributes.representedElementCategory == UICollectionElementCategory.cell {
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configure(attributes: attributes)
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}
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}
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return attributesArray
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}
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override open func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? {
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guard let attributes = super.layoutAttributesForItem(at: indexPath) as? MessagesCollectionViewLayoutAttributes else { return nil }
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if attributes.representedElementCategory == UICollectionElementCategory.cell {
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configure(attributes: attributes)
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}
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return attributes
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}
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private func configure(attributes: MessagesCollectionViewLayoutAttributes) {
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guard let messagesCollectionView = messagesCollectionView else { return }
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guard let dataSource = messagesCollectionView.messagesDataSource else { return }
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let indexPath = attributes.indexPath
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let message = dataSource.messageForItem(at: indexPath, in: messagesCollectionView)
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// First we set all the sizes so we can pass the attributes object around to calculate the origins
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attributes.messageContainerFrame = CGRect(origin: .zero, size: messageContainerSize(for: message, at: indexPath))
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attributes.cellTopLabelFrame = CGRect(origin: .zero, size: cellTopLabelSize(for: message, at: indexPath))
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attributes.cellBottomLabelFrame = CGRect(origin: .zero, size: cellBottomLabelSize(for: message, at: indexPath))
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attributes.avatarFrame = CGRect(origin: .zero, size: avatarSize(for: message, at: indexPath))
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attributes.messageLabelFont = messageLabelFont
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attributes.messageLabelInsets = messageLabelInsets
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attributes.cellTopLabelInsets = cellTopLabelInsets
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attributes.cellBottomLabelInsets = cellBottomLabelInsets
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attributes.direction = dataSource.isFromCurrentSender(message: message) ? .outgoing : .incoming
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let layoutDelegate = messagesCollectionView.messagesLayoutDelegate
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let avatarPosition = layoutDelegate?.avatarPosition(for: message, at: indexPath, in: messagesCollectionView) ?? .messageBottom
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// Now we set the origins for the frames using the attributes object that contains the calculated sizes
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attributes.messageContainerFrame.origin = messageContainerOrigin(for: attributes)
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attributes.cellTopLabelFrame.origin = cellTopLabelOrigin(for: message, and: attributes)
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attributes.cellBottomLabelFrame.origin = cellBottomLabelOrigin(for: message, and: attributes)
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attributes.avatarFrame.origin = avatarOrigin(for: attributes, with: avatarPosition)
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}
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// MARK: - Invalidation Context
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override open func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
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return collectionView?.bounds.width != newBounds.width || collectionView?.bounds.height != newBounds.height
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}
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open override func invalidationContext(forBoundsChange newBounds: CGRect) -> UICollectionViewLayoutInvalidationContext {
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let context = super.invalidationContext(forBoundsChange: newBounds)
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guard let flowLayoutContext = context as? UICollectionViewFlowLayoutInvalidationContext else { return context }
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flowLayoutContext.invalidateFlowLayoutDelegateMetrics = shouldInvalidateLayout(forBoundsChange: newBounds)
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return flowLayoutContext
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}
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}
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extension MessagesCollectionViewFlowLayout {
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// MARK: - Avatar Calculations
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/// The size of the avatar view.
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fileprivate func avatarSize(for message: MessageType, at indexPath: IndexPath) -> CGSize {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let layoutDelegate = messagesCollectionView.messagesLayoutDelegate else { return .zero }
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return layoutDelegate.avatarSize(for: message, at: indexPath, in: messagesCollectionView)
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}
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/// The origin for the avatar view.
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fileprivate func avatarOrigin(for attributes: MessagesCollectionViewLayoutAttributes, with avatarPosition: AvatarPosition) -> CGPoint {
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var origin = CGPoint.zero
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let contentWidth = attributes.frame.size.width
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let avatarWidth = attributes.avatarFrame.size.width
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switch attributes.direction {
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case .incoming:
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origin.x = 0
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case .outgoing:
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origin.x = contentWidth - avatarWidth
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}
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let contentHeight = attributes.frame.height
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let avatarHeight = attributes.avatarFrame.height
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let cellTopLabelHeight = attributes.cellTopLabelFrame.height
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let cellBottomLabelHeight = attributes.cellBottomLabelFrame.height
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let messageContainerHeight = attributes.messageContainerFrame.height
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switch avatarPosition {
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case .cellTop:
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origin.y = topLabelExtendsPastAvatar ? cellTopLabelHeight : 0
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case .cellBottom:
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origin.y = contentHeight - avatarHeight
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if bottomLabelExtendsPastAvatar { origin.y -= cellBottomLabelHeight }
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case .messageTop:
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origin.y = cellTopLabelHeight
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case .messageBottom:
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origin.y = contentHeight - avatarHeight - cellBottomLabelHeight
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case .messageCenter:
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let messageMidY = messageContainerHeight / 2
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let avatarMidY = avatarHeight / 2
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origin.y = contentHeight - cellTopLabelHeight - messageMidY - avatarMidY
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}
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return origin
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}
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// MARK: - Label Size Calculations
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/// The size required fit a NSAttributedString considering a constrained max width.
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fileprivate func labelSize(for attributedText: NSAttributedString, considering maxWidth: CGFloat) -> CGSize {
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let estimatedHeight = attributedText.height(considering: maxWidth)
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let estimatedWidth = attributedText.width(considering: estimatedHeight)
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let finalHeight = estimatedHeight.rounded(.up)
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let finalWidth = estimatedWidth > maxWidth ? maxWidth : estimatedWidth.rounded(.up)
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return CGSize(width: finalWidth, height: finalHeight)
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}
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/// The size required to fit a String considering a constrained max width.
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fileprivate func labelSize(for text: String, considering maxWidth: CGFloat, and font: UIFont) -> CGSize {
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let estimatedHeight = text.height(considering: maxWidth, and: font)
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let estimatedWidth = text.width(considering: estimatedHeight, and: font)
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let finalHeight = estimatedHeight.rounded(.up)
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let finalWidth = estimatedWidth > maxWidth ? maxWidth : estimatedWidth.rounded(.up)
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return CGSize(width: finalWidth, height: finalHeight)
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}
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// MARK: - Message Container Calculations
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/// The total value of the horizontal insets for the message label.
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private var horizontalMessageInsets: CGFloat {
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return messageLabelInsets.left + messageLabelInsets.right
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}
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/// The total value of the vertical insets for the message label.
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private var verticalMessageInsets: CGFloat {
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return messageLabelInsets.top + messageLabelInsets.bottom
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}
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/// The total width for all of the cells content excluding the message container.
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private func nonMessageContentWidth(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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var reservedWidth: CGFloat = 0
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let avatarWidth = avatarSize(for: message, at: indexPath).width
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/// Only consider padding if the avatar exists
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if avatarWidth > 0 {
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reservedWidth += avatarMessagePadding
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}
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reservedWidth += avatarWidth
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reservedWidth += messageToViewEdgePadding
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return reservedWidth
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}
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/// The max width available for the message container.
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private func messageContainerMaxWidth(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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let reservedWidth = nonMessageContentWidth(for: message, at: indexPath) + horizontalMessageInsets
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let availableWidth = itemWidth - reservedWidth
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return availableWidth
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}
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/// The size for the message container.
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fileprivate func messageContainerSize(for message: MessageType, at indexPath: IndexPath) -> CGSize {
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let maxWidth = messageContainerMaxWidth(for: message, at: indexPath)
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var messageContainerSize: CGSize = .zero
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switch message.data {
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case .text(let text):
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messageContainerSize = labelSize(for: text, considering: maxWidth, and: messageLabelFont)
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case .attributedText(let text):
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messageContainerSize = labelSize(for: text, considering: maxWidth)
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}
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messageContainerSize.width += horizontalMessageInsets
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messageContainerSize.height += verticalMessageInsets
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return messageContainerSize
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}
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/// The origin for the message container.
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fileprivate func messageContainerOrigin(for attributes: MessagesCollectionViewLayoutAttributes) -> CGPoint {
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let contentWidth = attributes.frame.width
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let avatarWidth = attributes.avatarFrame.width
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let messageContainerWidth = attributes.messageContainerFrame.width
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let cellTopLabelHeight = attributes.cellTopLabelFrame.height
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var origin = CGPoint.zero
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switch attributes.direction {
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case .incoming:
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origin.x = avatarWidth + avatarMessagePadding
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origin.y = cellTopLabelHeight
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case .outgoing:
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origin.x = contentWidth - avatarWidth - avatarMessagePadding - messageContainerWidth
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origin.y = cellTopLabelHeight
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}
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return origin
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}
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// MARK: - Cell Top Label Calculations
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/// The total value of the horizontal insets for the cell top label.
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private var topLabelHorizontalInsets: CGFloat {
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return cellTopLabelInsets.left + cellTopLabelInsets.right
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}
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/// The total value of the vertical insets for the cell top label.
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private var topLabelVerticalInsets: CGFloat {
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return cellTopLabelInsets.top + cellTopLabelInsets.bottom
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}
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/// The max width available for the cell top label.
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private func topLabelMaxWidth(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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if topLabelExtendsPastAvatar {
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return itemWidth - topLabelHorizontalInsets
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} else {
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let reservedWidth = nonMessageContentWidth(for: message, at: indexPath) + topLabelHorizontalInsets
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return itemWidth - reservedWidth
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}
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}
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/// The size of the cell top label.
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fileprivate func cellTopLabelSize(for message: MessageType, at indexPath: IndexPath) -> CGSize {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let dataSource = messagesCollectionView.messagesDataSource else { return .zero }
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guard let topLabelText = dataSource.cellTopLabelAttributedText(for: message, at: indexPath) else { return .zero }
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let maxWidth = topLabelMaxWidth(for: message, at: indexPath)
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var size = labelSize(for: topLabelText, considering: maxWidth)
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size.width += topLabelHorizontalInsets
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size.height += topLabelVerticalInsets
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return size
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}
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/// The origin for the cell top label.
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fileprivate func cellTopLabelOrigin(for message: MessageType, and attributes: MessagesCollectionViewLayoutAttributes) -> CGPoint {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let layoutDelegate = messagesCollectionView.messagesLayoutDelegate else { return .zero }
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let position = layoutDelegate.cellTopLabelPosition(for: message, at: attributes.indexPath, in: messagesCollectionView)
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var origin: CGPoint = .zero
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switch position {
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case .cellTrailing:
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origin.x = attributes.frame.width - attributes.cellTopLabelFrame.width
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case .cellLeading:
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origin.x = 0
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case .cellCenter:
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origin.x = itemWidth / 2 - (attributes.cellTopLabelFrame.width / 2)
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case .messageTrailing:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding + attributes.messageContainerFrame.width - attributes.cellTopLabelFrame.width
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case .outgoing:
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origin.x = attributes.frame.width - attributes.avatarFrame.width - avatarMessagePadding - attributes.cellTopLabelFrame.width
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}
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case .messageLeading:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding
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case .outgoing:
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origin.x = attributes.frame.width - attributes.avatarFrame.width - avatarMessagePadding - attributes.messageContainerFrame.width
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}
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case .messageCenter:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding + (attributes.messageContainerFrame.width / 2) - (attributes.cellTopLabelFrame.width / 2)
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case .outgoing:
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origin.x = attributes.frame.width - attributes.avatarFrame.width - avatarMessagePadding - (attributes.messageContainerFrame.width / 2) - (attributes.cellTopLabelFrame.width / 2)
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}
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}
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return origin
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}
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// MARK: - Cell Bottom Label Calculations
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/// The total value of the horizontal insets for the cell bottom label
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private var bottomLabelHorizontalInsets: CGFloat {
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return cellBottomLabelInsets.left + cellBottomLabelInsets.right
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}
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/// The total value of the vertical insets for the cell bottom label.
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private var bottomLabelVerticalInsets: CGFloat {
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return cellBottomLabelInsets.top + cellBottomLabelInsets.bottom
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}
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/// The max with available for the cell bottom label.
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private func bottomLabelMaxWidth(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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if bottomLabelExtendsPastAvatar {
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return itemWidth - bottomLabelHorizontalInsets
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} else {
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let reservedWidth = nonMessageContentWidth(for: message, at: indexPath) + bottomLabelHorizontalInsets
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return itemWidth - reservedWidth
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}
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}
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/// The size for the cell bottom label.
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fileprivate func cellBottomLabelSize(for message: MessageType, at indexPath: IndexPath) -> CGSize {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let dataSource = messagesCollectionView.messagesDataSource else { return .zero }
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guard let bottomLabelText = dataSource.cellBottomLabelAttributedText(for: message, at: indexPath) else { return .zero }
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let maxWidth = bottomLabelMaxWidth(for: message, at: indexPath)
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var size = labelSize(for: bottomLabelText, considering: maxWidth)
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size.width += bottomLabelHorizontalInsets
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size.height += bottomLabelVerticalInsets
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return size
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}
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/// The origin for the cell bottom label.
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fileprivate func cellBottomLabelOrigin(for message: MessageType, and attributes: MessagesCollectionViewLayoutAttributes) -> CGPoint {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let layoutDelegate = messagesCollectionView.messagesLayoutDelegate else { return .zero }
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let position = layoutDelegate.cellBottomLabelPosition(for: message, at: attributes.indexPath, in: messagesCollectionView)
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var origin: CGPoint = .zero
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origin.y = attributes.frame.height - attributes.cellBottomLabelFrame.height
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switch position {
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case .cellTrailing:
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origin.x = attributes.frame.width - attributes.cellBottomLabelFrame.width
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case .cellLeading:
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origin.x = 0
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case .cellCenter:
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origin.x = itemWidth / 2 - (attributes.cellBottomLabelFrame.width / 2)
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case .messageTrailing:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding + attributes.messageContainerFrame.width - attributes.cellBottomLabelFrame.width
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case .outgoing:
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origin.x = attributes.frame.width - attributes.avatarFrame.width - avatarMessagePadding - attributes.cellBottomLabelFrame.width
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}
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case .messageLeading:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding
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case .outgoing:
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origin.x = attributes.frame.width - attributes.avatarFrame.width - avatarMessagePadding - attributes.messageContainerFrame.width
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}
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case .messageCenter:
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switch attributes.direction {
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case .incoming:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding + (attributes.messageContainerFrame.width / 2) - (attributes.cellBottomLabelFrame.width / 2)
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case .outgoing:
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origin.x = attributes.avatarFrame.width + avatarMessagePadding + (attributes.messageContainerFrame.width / 2) - (attributes.cellBottomLabelFrame.width / 2)
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}
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}
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return origin
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}
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// MARK: - Cell Size Calculations
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/// The minimum height for the cell.
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private func minimumCellHeight(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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guard let messagesCollectionView = messagesCollectionView else { return 0 }
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guard let layoutDelegate = messagesCollectionView.messagesLayoutDelegate else { return 0 }
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let avatarPosition = layoutDelegate.avatarPosition(for: message, at: indexPath, in: messagesCollectionView)
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let topLabelHeight = cellTopLabelSize(for: message, at: indexPath).height
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let avatarHeight = avatarSize(for: message, at: indexPath).height
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let bottomLabelHeight = cellBottomLabelSize(for: message, at: indexPath).height
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switch avatarPosition {
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case .cellTop:
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return max(avatarHeight, topLabelHeight) + bottomLabelHeight
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case .cellBottom:
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return max(avatarHeight, bottomLabelHeight) + topLabelHeight
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case .messageTop, .messageCenter, .messageBottom:
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return topLabelHeight + avatarHeight + bottomLabelHeight
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}
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}
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/// The calculated height of the cell not considering the minimum height.
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private func estimatedCellHeight(for message: MessageType, at indexPath: IndexPath) -> CGFloat {
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let messageContainerHeight = messageContainerSize(for: message, at: indexPath).height
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let cellTopLabelHeight = cellTopLabelSize(for: message, at: indexPath).height
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let cellBottomLabelHeight = cellBottomLabelSize(for: message, at: indexPath).height
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return messageContainerHeight + cellBottomLabelHeight + cellTopLabelHeight
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}
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/// The size for the cell considering all cell contents.
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open func sizeForItem(at indexPath: IndexPath) -> CGSize {
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guard let messagesCollectionView = messagesCollectionView else { return .zero }
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guard let dataSource = messagesCollectionView.messagesDataSource else { return .zero }
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let message = dataSource.messageForItem(at: indexPath, in: messagesCollectionView)
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let minimumHeight = minimumCellHeight(for: message, at: indexPath)
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let estimatedHeight = estimatedCellHeight(for: message, at: indexPath)
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let itemHeight = estimatedHeight > minimumHeight ? estimatedHeight : minimumHeight
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return CGSize(width: itemWidth, height: itemHeight)
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}
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}
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