mastodon-ios/Mastodon/Scene/Share/View/Container/MosaicImageViewContainer.swift

285 lines
11 KiB
Swift

//
// MosaicImageViewContainer.swift
// Mastodon
//
// Created by Cirno MainasuK on 2021-2-23.
//
import os.log
import func AVFoundation.AVMakeRect
import UIKit
protocol MosaicImageViewContainerPresentable: class {
var mosaicImageViewContainer: MosaicImageViewContainer { get }
}
protocol MosaicImageViewDelegate: class {
func mosaicImageViewContainer(_ mosaicImageViewContainer: MosaicImageViewContainer, didTapImageView imageView: UIImageView, atIndex index: Int)
}
final class MosaicImageViewContainer: UIView {
static let cornerRadius: CGFloat = 4
weak var delegate: MosaicImageViewDelegate?
let container = UIStackView()
var imageViews = [UIImageView]() {
didSet {
imageViews.forEach { imageView in
imageView.isUserInteractionEnabled = true
let tapGesture = UITapGestureRecognizer.singleTapGestureRecognizer
tapGesture.addTarget(self, action: #selector(MosaicImageViewContainer.photoTapGestureRecognizerHandler(_:)))
imageView.addGestureRecognizer(tapGesture)
}
}
}
private var containerHeightLayoutConstraint: NSLayoutConstraint!
override init(frame: CGRect) {
super.init(frame: frame)
_init()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
_init()
}
}
extension MosaicImageViewContainer {
private func _init() {
container.translatesAutoresizingMaskIntoConstraints = false
addSubview(container)
containerHeightLayoutConstraint = container.heightAnchor.constraint(equalToConstant: 162).priority(.required - 1)
NSLayoutConstraint.activate([
container.topAnchor.constraint(equalTo: topAnchor),
container.leadingAnchor.constraint(equalTo: leadingAnchor),
trailingAnchor.constraint(equalTo: container.trailingAnchor),
bottomAnchor.constraint(equalTo: container.bottomAnchor),
containerHeightLayoutConstraint
])
container.axis = .horizontal
container.distribution = .fillEqually
}
}
extension MosaicImageViewContainer {
func reset() {
container.arrangedSubviews.forEach { subview in
container.removeArrangedSubview(subview)
subview.removeFromSuperview()
}
container.subviews.forEach { subview in
subview.removeFromSuperview()
}
imageViews = []
container.spacing = 1
}
func setupImageView(aspectRatio: CGSize, maxSize: CGSize) -> UIImageView {
reset()
let contentView = UIView()
contentView.translatesAutoresizingMaskIntoConstraints = false
container.addArrangedSubview(contentView)
let rect = AVMakeRect(
aspectRatio: aspectRatio,
insideRect: CGRect(origin: .zero, size: maxSize)
)
let imageView = UIImageView()
imageViews.append(imageView)
imageView.layer.masksToBounds = true
imageView.layer.cornerRadius = MosaicImageViewContainer.cornerRadius
imageView.contentMode = .scaleAspectFill
imageView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(imageView)
NSLayoutConstraint.activate([
imageView.topAnchor.constraint(equalTo: contentView.topAnchor),
imageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
imageView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
imageView.widthAnchor.constraint(equalToConstant: floor(rect.width)).priority(.required - 1),
])
containerHeightLayoutConstraint.constant = floor(rect.height)
containerHeightLayoutConstraint.isActive = true
return imageView
}
func setupImageViews(count: Int, maxHeight: CGFloat) -> [UIImageView] {
reset()
guard count > 1 else {
return []
}
containerHeightLayoutConstraint.constant = maxHeight
containerHeightLayoutConstraint.isActive = true
let contentLeftStackView = UIStackView()
let contentRightStackView = UIStackView()
[contentLeftStackView, contentRightStackView].forEach { stackView in
stackView.axis = .vertical
stackView.distribution = .fillEqually
stackView.spacing = 1
}
container.addArrangedSubview(contentLeftStackView)
container.addArrangedSubview(contentRightStackView)
var imageViews: [UIImageView] = []
for _ in 0..<count {
imageViews.append(UIImageView())
}
self.imageViews.append(contentsOf: imageViews)
imageViews.forEach { imageView in
imageView.layer.masksToBounds = true
imageView.layer.cornerRadius = MosaicImageViewContainer.cornerRadius
imageView.layer.cornerCurve = .continuous
imageView.contentMode = .scaleAspectFill
}
if count == 2 {
contentLeftStackView.addArrangedSubview(imageViews[0])
contentRightStackView.addArrangedSubview(imageViews[1])
switch UIApplication.shared.userInterfaceLayoutDirection {
case .rightToLeft:
imageViews[1].layer.maskedCorners = [.layerMinXMinYCorner, .layerMinXMaxYCorner]
imageViews[0].layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
default:
imageViews[0].layer.maskedCorners = [.layerMinXMinYCorner, .layerMinXMaxYCorner]
imageViews[1].layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
}
} else if count == 3 {
contentLeftStackView.addArrangedSubview(imageViews[0])
contentRightStackView.addArrangedSubview(imageViews[1])
contentRightStackView.addArrangedSubview(imageViews[2])
switch UIApplication.shared.userInterfaceLayoutDirection {
case .rightToLeft:
imageViews[0].layer.maskedCorners = [.layerMaxXMinYCorner, .layerMaxXMaxYCorner]
imageViews[1].layer.maskedCorners = [.layerMinXMinYCorner]
imageViews[2].layer.maskedCorners = [.layerMinXMaxYCorner]
default:
imageViews[0].layer.maskedCorners = [.layerMinXMinYCorner, .layerMinXMaxYCorner]
imageViews[1].layer.maskedCorners = [.layerMaxXMinYCorner]
imageViews[2].layer.maskedCorners = [.layerMaxXMaxYCorner]
}
} else if count == 4 {
contentLeftStackView.addArrangedSubview(imageViews[0])
contentRightStackView.addArrangedSubview(imageViews[1])
contentLeftStackView.addArrangedSubview(imageViews[2])
contentRightStackView.addArrangedSubview(imageViews[3])
switch UIApplication.shared.userInterfaceLayoutDirection {
case .rightToLeft:
imageViews[0].layer.maskedCorners = [.layerMaxXMinYCorner]
imageViews[1].layer.maskedCorners = [.layerMinXMinYCorner]
imageViews[2].layer.maskedCorners = [.layerMaxXMaxYCorner]
imageViews[3].layer.maskedCorners = [.layerMinXMaxYCorner]
default:
imageViews[0].layer.maskedCorners = [.layerMinXMinYCorner]
imageViews[1].layer.maskedCorners = [.layerMaxXMinYCorner]
imageViews[2].layer.maskedCorners = [.layerMinXMaxYCorner]
imageViews[3].layer.maskedCorners = [.layerMaxXMaxYCorner]
}
}
return imageViews
}
}
extension MosaicImageViewContainer {
@objc private func photoTapGestureRecognizerHandler(_ sender: UITapGestureRecognizer) {
guard let imageView = sender.view as? UIImageView else { return }
guard let index = imageViews.firstIndex(of: imageView) else { return }
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: tap photo at index: %ld", ((#file as NSString).lastPathComponent), #line, #function, index)
delegate?.mosaicImageViewContainer(self, didTapImageView: imageView, atIndex: index)
}
}
#if DEBUG && canImport(SwiftUI)
import SwiftUI
struct MosaicImageView_Previews: PreviewProvider {
static var images: [UIImage] {
return ["bradley-dunn", "mrdongok", "lucas-ludwig", "markus-spiske"]
.map { UIImage(named: $0)! }
}
static var previews: some View {
Group {
UIViewPreview(width: 375) {
let view = MosaicImageViewContainer()
let image = images[3]
let imageView = view.setupImageView(
aspectRatio: image.size,
maxSize: CGSize(width: 375, height: 400)
)
imageView.image = image
return view
}
.previewLayout(.fixed(width: 375, height: 400))
.previewDisplayName("Portrait - one image")
UIViewPreview(width: 375) {
let view = MosaicImageViewContainer()
let image = images[1]
let imageView = view.setupImageView(
aspectRatio: image.size,
maxSize: CGSize(width: 375, height: 400)
)
imageView.layer.masksToBounds = true
imageView.layer.cornerRadius = 8
imageView.contentMode = .scaleAspectFill
imageView.image = image
return view
}
.previewLayout(.fixed(width: 375, height: 400))
.previewDisplayName("Landscape - one image")
UIViewPreview(width: 375) {
let view = MosaicImageViewContainer()
let images = self.images.prefix(2)
let imageViews = view.setupImageViews(count: images.count, maxHeight: 162)
for (i, imageView) in imageViews.enumerated() {
imageView.image = images[i]
}
return view
}
.previewLayout(.fixed(width: 375, height: 200))
.previewDisplayName("two image")
UIViewPreview(width: 375) {
let view = MosaicImageViewContainer()
let images = self.images.prefix(3)
let imageViews = view.setupImageViews(count: images.count, maxHeight: 162)
for (i, imageView) in imageViews.enumerated() {
imageView.image = images[i]
}
return view
}
.previewLayout(.fixed(width: 375, height: 200))
.previewDisplayName("three image")
UIViewPreview(width: 375) {
let view = MosaicImageViewContainer()
let images = self.images.prefix(4)
let imageViews = view.setupImageViews(count: images.count, maxHeight: 162)
for (i, imageView) in imageViews.enumerated() {
imageView.image = images[i]
}
return view
}
.previewLayout(.fixed(width: 375, height: 200))
.previewDisplayName("four image")
}
}
}
#endif