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//
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// ChatLayout
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// MessageContainerView.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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/// A container view that helps to layout the message view and its accessory
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public final class MessageContainerView<AccessoryViewFactory: StaticViewFactory, MainView: UIView>: UIView {
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private lazy var stackView = UIStackView(frame: bounds)
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/// An accessory view.
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public lazy var accessoryView: AccessoryViewFactory.View? = AccessoryViewFactory.buildView(within: bounds)
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/// Main view.
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public var customView: MainView {
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internalContentView.customView
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}
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/// An alignment of the contained views within the `MessageContainerView`,
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public var alignment: ChatItemAlignment = .fullWidth {
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didSet {
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switch alignment {
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case .leading:
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internalContentView.flexibleEdges = [.trailing]
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case .trailing:
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internalContentView.flexibleEdges = [.leading]
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case .center:
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internalContentView.flexibleEdges = [.leading, .trailing]
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case .fullWidth:
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internalContentView.flexibleEdges = []
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}
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}
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}
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private lazy var internalContentView = EdgeAligningView<MainView>(frame: bounds)
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/// Initializes and returns a newly allocated view object with the specified frame rectangle.
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/// - Parameter frame: The frame rectangle for the view, measured in points. The origin of the frame is relative
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/// to the superview in which you plan to add it.
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public override init(frame: CGRect) {
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super.init(frame: frame)
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setupSubviews()
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}
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/// Returns an object initialized from data in a given unarchiver.
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/// - Parameter coder: An unarchiver object.
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public required init?(coder: NSCoder) {
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super.init(coder: coder)
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setupSubviews()
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}
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private func setupSubviews() {
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translatesAutoresizingMaskIntoConstraints = false
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insetsLayoutMarginsFromSafeArea = false
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layoutMargins = .zero
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addSubview(stackView)
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stackView.translatesAutoresizingMaskIntoConstraints = false
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stackView.axis = .horizontal
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stackView.spacing = .zero
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NSLayoutConstraint.activate([
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stackView.topAnchor.constraint(equalTo: layoutMarginsGuide.topAnchor),
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stackView.bottomAnchor.constraint(equalTo: layoutMarginsGuide.bottomAnchor),
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stackView.leadingAnchor.constraint(equalTo: layoutMarginsGuide.leadingAnchor),
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stackView.trailingAnchor.constraint(equalTo: layoutMarginsGuide.trailingAnchor)
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])
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if let accessoryView {
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stackView.addArrangedSubview(accessoryView)
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accessoryView.translatesAutoresizingMaskIntoConstraints = false
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}
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internalContentView.translatesAutoresizingMaskIntoConstraints = false
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stackView.addArrangedSubview(internalContentView)
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}
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}
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