123 lines
4.1 KiB
Swift
123 lines
4.1 KiB
Swift
//
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// StatusContentContainer.swift
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// Tusker
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//
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// Created by Shadowfacts on 10/2/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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class StatusContentContainer: UIView {
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let contentTextView = StatusContentTextView().configure {
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$0.adjustsFontForContentSizeCategory = true
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$0.isScrollEnabled = false
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$0.backgroundColor = nil
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$0.isEditable = false
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$0.isSelectable = false
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}
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let cardView = StatusCardView().configure {
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NSLayoutConstraint.activate([
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$0.heightAnchor.constraint(equalToConstant: 65),
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])
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}
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let attachmentsView = AttachmentsContainerView().configure {
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NSLayoutConstraint.activate([
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$0.heightAnchor.constraint(equalTo: $0.widthAnchor, multiplier: 9/16),
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])
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}
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let pollView = StatusPollView()
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private var arrangedSubviews: [UIView] {
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[contentTextView, cardView, attachmentsView, pollView]
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}
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private var isHiddenObservations: [NSKeyValueObservation] = []
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private var verticalConstraints: [NSLayoutConstraint] = []
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private var lastSubviewBottomConstraint: NSLayoutConstraint?
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private var zeroHeightConstraint: NSLayoutConstraint!
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private var isCollapsed = false
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override init(frame: CGRect) {
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super.init(frame: frame)
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for subview in arrangedSubviews {
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subview.translatesAutoresizingMaskIntoConstraints = false
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addSubview(subview)
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NSLayoutConstraint.activate([
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subview.leadingAnchor.constraint(equalTo: leadingAnchor),
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subview.trailingAnchor.constraint(equalTo: trailingAnchor),
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])
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}
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// this constraint needs to have low priority so that during the collapse/expand animation, the content container is the view that shrinks/expands
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zeroHeightConstraint = heightAnchor.constraint(equalToConstant: 0)
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zeroHeightConstraint.priority = .defaultLow
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setNeedsUpdateConstraints()
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isHiddenObservations = arrangedSubviews.map {
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$0.observe(\.isHidden) { [unowned self] _, _ in
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self.setNeedsUpdateConstraints()
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}
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}
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func updateConstraints() {
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NSLayoutConstraint.deactivate(verticalConstraints)
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verticalConstraints = []
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var lastVisibleSubview: UIView?
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for subview in arrangedSubviews {
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guard !subview.isHidden else {
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continue
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}
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if let lastVisibleSubview {
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verticalConstraints.append(subview.topAnchor.constraint(equalTo: lastVisibleSubview.bottomAnchor, constant: 4))
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} else {
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verticalConstraints.append(subview.topAnchor.constraint(equalTo: topAnchor))
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}
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lastVisibleSubview = subview
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}
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NSLayoutConstraint.activate(verticalConstraints)
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lastSubviewBottomConstraint?.isActive = false
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// this constraint needs to have low priority so that during the collapse/expand animation, the content container is the view that shrinks/expands
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lastSubviewBottomConstraint = subviews.last(where: { !$0.isHidden })!.bottomAnchor.constraint(equalTo: bottomAnchor)
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lastSubviewBottomConstraint!.isActive = !isCollapsed
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lastSubviewBottomConstraint!.priority = .defaultLow
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zeroHeightConstraint.isActive = isCollapsed
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super.updateConstraints()
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}
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func setCollapsed(_ collapsed: Bool) {
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guard collapsed != isCollapsed else {
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return
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}
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isCollapsed = collapsed
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// ensure that we have a lastSubviewBottomConstraint
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updateConstraintsIfNeeded()
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// force unwrap because the content container should always have at least one view
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lastSubviewBottomConstraint!.isActive = !collapsed
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zeroHeightConstraint.isActive = collapsed
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}
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}
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