forked from zelo72/mastodon-ios
130 lines
3.4 KiB
Swift
130 lines
3.4 KiB
Swift
//
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// AvatarButton.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-7-21.
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//
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import os.log
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import UIKit
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class AvatarButton: UIControl {
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// UIControl.Event - Application: 0x0F000000
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static let primaryAction = UIControl.Event(rawValue: 1 << 25) // 0x01000000
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var primaryActionState: UIControl.State = .normal
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var avatarImageSize = CGSize(width: 42, height: 42)
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let avatarImageView = AvatarImageView()
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override init(frame: CGRect) {
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super.init(frame: frame)
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_init()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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_init()
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}
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func _init() {
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avatarImageView.translatesAutoresizingMaskIntoConstraints = false
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addSubview(avatarImageView)
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NSLayoutConstraint.activate([
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avatarImageView.topAnchor.constraint(equalTo: topAnchor),
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avatarImageView.leadingAnchor.constraint(equalTo: leadingAnchor),
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avatarImageView.trailingAnchor.constraint(equalTo: trailingAnchor),
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avatarImageView.bottomAnchor.constraint(equalTo: bottomAnchor),
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])
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}
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func updateAppearance() {
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avatarImageView.alpha = primaryActionState.contains(.highlighted) ? 0.6 : 1.0
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}
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}
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extension AvatarButton {
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override var intrinsicContentSize: CGSize {
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return avatarImageSize
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}
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override func beginTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
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defer { updateAppearance() }
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updateState(touch: touch, event: event)
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return super.beginTracking(touch, with: event)
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}
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override func continueTracking(_ touch: UITouch, with event: UIEvent?) -> Bool {
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defer { updateAppearance() }
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updateState(touch: touch, event: event)
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return super.continueTracking(touch, with: event)
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}
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override func endTracking(_ touch: UITouch?, with event: UIEvent?) {
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defer { updateAppearance() }
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resetState()
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if let touch = touch {
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if AvatarButton.isTouching(touch, view: self, event: event) {
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sendActions(for: AvatarButton.primaryAction)
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} else {
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// do nothing
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}
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}
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super.endTracking(touch, with: event)
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}
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override func cancelTracking(with event: UIEvent?) {
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defer { updateAppearance() }
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resetState()
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super.cancelTracking(with: event)
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}
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}
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extension AvatarButton {
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private static func isTouching(_ touch: UITouch, view: UIView, event: UIEvent?) -> Bool {
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let location = touch.location(in: view)
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return view.point(inside: location, with: event)
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}
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private func resetState() {
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primaryActionState = .normal
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}
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private func updateState(touch: UITouch, event: UIEvent?) {
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primaryActionState = AvatarButton.isTouching(touch, view: self, event: event) ? .highlighted : .normal
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}
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}
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#if canImport(SwiftUI) && DEBUG
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import SwiftUI
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struct AvatarButton_Previews: PreviewProvider {
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static var previews: some View {
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UIViewPreview(width: 42) {
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let avatarButton = AvatarButton()
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avatarButton.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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avatarButton.widthAnchor.constraint(equalToConstant: 42),
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avatarButton.heightAnchor.constraint(equalToConstant: 42),
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])
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return avatarButton
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}
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.previewLayout(.fixed(width: 42, height: 42))
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}
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}
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#endif
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