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//
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// ChatLayout
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// ItemModel.swift
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// https://github.com/ekazaev/ChatLayout
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//
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// Created by Eugene Kazaev in 2020-2022.
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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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struct ItemModel {
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struct Configuration {
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let alignment: ChatItemAlignment
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let preferredSize: CGSize
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let calculatedSize: CGSize?
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}
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let id: UUID
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var preferredSize: CGSize
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var offsetY: CGFloat = .zero
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var calculatedSize: CGSize?
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var calculatedOnce: Bool = false
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var alignment: ChatItemAlignment
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var origin: CGPoint {
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CGPoint(x: 0, y: offsetY)
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}
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var height: CGFloat {
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size.height
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}
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var locationHeight: CGFloat {
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offsetY + height
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}
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var size: CGSize {
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guard let calculatedSize = calculatedSize else {
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return preferredSize
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}
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return calculatedSize
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}
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var frame: CGRect {
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CGRect(origin: origin, size: size)
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}
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init(id: UUID = UUID(), with configuration: Configuration) {
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self.id = id
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alignment = configuration.alignment
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preferredSize = configuration.preferredSize
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calculatedSize = configuration.calculatedSize
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calculatedOnce = configuration.calculatedSize != nil
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}
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// We are just resetting `calculatedSize` if needed as the actual size will be found in invalidationContext(forPreferredLayoutAttributes:, withOriginalAttributes:)
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// It is important for the rotation to keep previous frame size.
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mutating func resetSize() {
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guard let calculatedSize = calculatedSize else {
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return
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}
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self.calculatedSize = nil
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preferredSize = calculatedSize
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}
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}
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