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//
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// ChatLayout
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// ChatLayoutAttributes.swift
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// https://github.com/ekazaev/ChatLayout
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//
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// Created by Eugene Kazaev in 2020-2023.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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/// Custom implementation of `UICollectionViewLayoutAttributes`
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public final class ChatLayoutAttributes: UICollectionViewLayoutAttributes {
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/// Alignment of the current item. Can be changed within `UICollectionViewCell.preferredLayoutAttributesFitting(...)`
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public var alignment: ChatItemAlignment = .fullWidth
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/// `CollectionViewChatLayout`s additional insets setup using `ChatLayoutSettings`. Added for convenience.
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public internal(set) var additionalInsets: UIEdgeInsets = .zero
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/// `UICollectionView`s frame size. Added for convenience.
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public internal(set) var viewSize: CGSize = .zero
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/// `UICollectionView`s adjusted content insets. Added for convenience.
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public internal(set) var adjustedContentInsets: UIEdgeInsets = .zero
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/// `CollectionViewChatLayout`s visible bounds size excluding `adjustedContentInsets`. Added for convenience.
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public internal(set) var visibleBoundsSize: CGSize = .zero
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/// `CollectionViewChatLayout`s visible bounds size excluding `adjustedContentInsets` and `additionalInsets`. Added for convenience.
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public internal(set) var layoutFrame: CGRect = .zero
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#if DEBUG
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var id: UUID?
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#endif
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convenience init(kind: ItemKind, indexPath: IndexPath = IndexPath(item: 0, section: 0)) {
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switch kind {
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case .cell:
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self.init(forCellWith: indexPath)
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case .header:
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self.init(forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, with: indexPath)
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case .footer:
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self.init(forSupplementaryViewOfKind: UICollectionView.elementKindSectionFooter, with: indexPath)
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}
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}
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/// Returns an exact copy of `ChatLayoutAttributes`.
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public override func copy(with zone: NSZone? = nil) -> Any {
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let copy = super.copy(with: zone) as! ChatLayoutAttributes
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copy.viewSize = viewSize
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copy.alignment = alignment
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copy.layoutFrame = layoutFrame
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copy.additionalInsets = additionalInsets
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copy.visibleBoundsSize = visibleBoundsSize
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copy.adjustedContentInsets = adjustedContentInsets
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#if DEBUG
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copy.id = id
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#endif
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return copy
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}
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/// Returns a Boolean value indicating whether two `ChatLayoutAttributes` are considered equal.
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public override func isEqual(_ object: Any?) -> Bool {
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super.isEqual(object)
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&& alignment == (object as? ChatLayoutAttributes)?.alignment
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}
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/// `ItemKind` represented by this attributes object.
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public var kind: ItemKind {
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switch (representedElementCategory, representedElementKind) {
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case (.cell, nil):
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return .cell
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case (.supplementaryView, .some(UICollectionView.elementKindSectionHeader)):
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return .header
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case (.supplementaryView, .some(UICollectionView.elementKindSectionFooter)):
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return .footer
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default:
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preconditionFailure("Unsupported element kind.")
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}
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}
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func typedCopy() -> ChatLayoutAttributes {
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guard let typedCopy = copy() as? ChatLayoutAttributes else {
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fatalError("Internal inconsistency.")
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}
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return typedCopy
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}
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}
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