mastodon-ios/Mastodon/Scene/Share/View/Control/AvatarStackContainerButton....

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//
// AvatarStackContainerButton.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-3-10.
//
2021-03-10 07:09:38 +01:00
import os.log
import UIKit
final class AvatarStackedImageView: UIImageView { }
// MARK: - AvatarConfigurableView
extension AvatarStackedImageView: AvatarConfigurableView {
static var configurableAvatarImageSize: CGSize { CGSize(width: 28, height: 28) }
static var configurableAvatarImageCornerRadius: CGFloat { 4 }
var configurableAvatarImageView: UIImageView? { self }
var configurableAvatarButton: UIButton? { nil }
}
final class AvatarStackContainerButton: UIControl {
static let containerSize = CGSize(width: 42, height: 42)
static let maskOffset: CGFloat = 2
// UIControl.Event - Application: 0x0F000000
static let primaryAction = UIControl.Event(rawValue: 1 << 25) // 0x01000000
var primaryActionState: UIControl.State = .normal
let topLeadingAvatarStackedImageView = AvatarStackedImageView()
let bottomTrailingAvatarStackedImageView = AvatarStackedImageView()
override init(frame: CGRect) {
super.init(frame: frame)
_init()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
_init()
}
}
extension AvatarStackContainerButton {
private func _init() {
topLeadingAvatarStackedImageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(topLeadingAvatarStackedImageView)
NSLayoutConstraint.activate([
topLeadingAvatarStackedImageView.topAnchor.constraint(equalTo: topAnchor),
topLeadingAvatarStackedImageView.leadingAnchor.constraint(equalTo: leadingAnchor),
topLeadingAvatarStackedImageView.widthAnchor.constraint(equalToConstant: AvatarStackedImageView.configurableAvatarImageSize.width).priority(.defaultHigh),
topLeadingAvatarStackedImageView.heightAnchor.constraint(equalToConstant: AvatarStackedImageView.configurableAvatarImageSize.height).priority(.defaultHigh),
])
bottomTrailingAvatarStackedImageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(bottomTrailingAvatarStackedImageView)
NSLayoutConstraint.activate([
bottomTrailingAvatarStackedImageView.bottomAnchor.constraint(equalTo: bottomAnchor),
bottomTrailingAvatarStackedImageView.trailingAnchor.constraint(equalTo: trailingAnchor),
bottomTrailingAvatarStackedImageView.widthAnchor.constraint(equalToConstant: AvatarStackedImageView.configurableAvatarImageSize.width).priority(.defaultHigh),
bottomTrailingAvatarStackedImageView.heightAnchor.constraint(equalToConstant: AvatarStackedImageView.configurableAvatarImageSize.height).priority(.defaultHigh),
])
// mask topLeadingAvatarStackedImageView
let offset: CGFloat = 2
let path: CGPath = {
let path = CGMutablePath()
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path.addRect(CGRect(origin: .zero, size: AvatarStackedImageView.configurableAvatarImageSize))
let mirrorScale: CGFloat = UIApplication.shared.userInterfaceLayoutDirection == .rightToLeft ? -1 : 1
path.addPath(UIBezierPath(
roundedRect: CGRect(
x: mirrorScale * (AvatarStackContainerButton.containerSize.width - AvatarStackedImageView.configurableAvatarImageSize.width - offset),
y: AvatarStackContainerButton.containerSize.height - AvatarStackedImageView.configurableAvatarImageSize.height - offset,
width: AvatarStackedImageView.configurableAvatarImageSize.width,
height: AvatarStackedImageView.configurableAvatarImageSize.height
),
cornerRadius: AvatarStackedImageView.configurableAvatarImageCornerRadius
).cgPath)
return path
}()
let maskShapeLayer = CAShapeLayer()
maskShapeLayer.backgroundColor = UIColor.black.cgColor
maskShapeLayer.fillRule = .evenOdd
maskShapeLayer.path = path
topLeadingAvatarStackedImageView.layer.mask = maskShapeLayer
topLeadingAvatarStackedImageView.image = UIImage.placeholder(color: .systemFill)
bottomTrailingAvatarStackedImageView.image = UIImage.placeholder(color: .systemFill)
}
override var intrinsicContentSize: CGSize {
return AvatarStackContainerButton.containerSize
}
override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
defer { updateAppearance() }
updateState(touch: touch, event: event)
return super.beginTracking(touch, with: event)
}
override func continueTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
defer { updateAppearance() }
updateState(touch: touch, event: event)
return super.continueTracking(touch, with: event)
}
override func endTracking(_ touch: UITouch?, with event: UIEvent?) {
defer { updateAppearance() }
resetState()
if let touch = touch {
if AvatarStackContainerButton.isTouching(touch, view: self, event: event) {
sendActions(for: AvatarStackContainerButton.primaryAction)
} else {
// do nothing
}
}
super.endTracking(touch, with: event)
}
override func cancelTracking(with event: UIEvent?) {
defer { updateAppearance() }
resetState()
super.cancelTracking(with: event)
}
}
extension AvatarStackContainerButton {
private func updateAppearance() {
topLeadingAvatarStackedImageView.alpha = primaryActionState.contains(.highlighted) ? 0.6 : 1.0
bottomTrailingAvatarStackedImageView.alpha = primaryActionState.contains(.highlighted) ? 0.6 : 1.0
}
private static func isTouching(_ touch: UITouch, view: UIView, event: UIEvent?) -> Bool {
let location = touch.location(in: view)
return view.point(inside: location, with: event)
}
private func resetState() {
primaryActionState = .normal
}
private func updateState(touch: UITouch, event: UIEvent?) {
primaryActionState = AvatarStackContainerButton.isTouching(touch, view: self, event: event) ? .highlighted : .normal
}
}
#if canImport(SwiftUI) && DEBUG
import SwiftUI
struct AvatarStackContainerButton_Previews: PreviewProvider {
static var previews: some View {
UIViewPreview(width: 42) {
let avatarStackContainerButton = AvatarStackContainerButton()
avatarStackContainerButton.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
avatarStackContainerButton.widthAnchor.constraint(equalToConstant: 42),
avatarStackContainerButton.heightAnchor.constraint(equalToConstant: 42),
])
return avatarStackContainerButton
}
.previewLayout(.fixed(width: 42, height: 42))
}
}
#endif