mirror of
https://github.com/vector-im/element-ios.git
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182 lines
4.9 KiB
Swift
182 lines
4.9 KiB
Swift
/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import UIKit
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import Reusable
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final class ContextualMenuItemView: UIView, NibOwnerLoadable {
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// MARK: - Constants
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private enum ColorAlpha {
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static let normal: CGFloat = 1.0
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static let highlighted: CGFloat = 0.3
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}
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private enum ViewAlpha {
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static let normal: CGFloat = 1.0
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static let disabled: CGFloat = 0.3
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}
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// MARK: - Properties
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// MARK: Outlets
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@IBOutlet private weak var imageView: UIImageView!
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@IBOutlet private weak var titleLabel: UILabel!
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// MARK: Private
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private var originalImage: UIImage?
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private var isHighlighted: Bool = false {
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didSet {
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self.updateView()
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}
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}
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// MARK: Public
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var titleColor: UIColor = .black {
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didSet {
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self.updateView()
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}
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}
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var imageColor: UIColor = .black {
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didSet {
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self.updateView()
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}
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}
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var isEnabled: Bool = true {
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didSet {
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self.updateView()
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}
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}
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var action: (() -> Void)?
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// MARK: Setup
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private func commonInit() {
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self.setupGestureRecognizer()
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}
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convenience init() {
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self.init(frame: CGRect.zero)
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}
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required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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self.loadNibContent()
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self.commonInit()
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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self.loadNibContent()
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self.commonInit()
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}
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// MARK: - Public
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func fill(menuItem: RoomContextualMenuItem) {
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self.fill(title: menuItem.title, image: menuItem.image)
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self.setupAccessibility(title: menuItem.title, isEnabled: menuItem.isEnabled)
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self.action = menuItem.action
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self.isEnabled = menuItem.isEnabled
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}
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// MARK: - Private
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private func fill(title: String, image: UIImage?) {
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self.originalImage = image?.withRenderingMode(.alwaysTemplate)
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self.titleLabel.text = title
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self.updateView()
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}
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private func setupAccessibility(title: String, isEnabled: Bool) {
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self.isAccessibilityElement = true
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self.accessibilityLabel = title
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self.accessibilityTraits = .button
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if !isEnabled {
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self.accessibilityTraits.insert(.notEnabled)
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}
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}
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private func setupGestureRecognizer() {
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let gestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(buttonAction(_:)))
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gestureRecognizer.minimumPressDuration = 0
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self.addGestureRecognizer(gestureRecognizer)
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}
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private func updateView() {
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let viewAlpha = self.isEnabled ? ViewAlpha.normal : ViewAlpha.disabled
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let colorAlpha = self.isHighlighted ? ColorAlpha.highlighted : ColorAlpha.normal
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self.updateTitleAndImageAlpha(viewAlpha)
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self.imageView.tintColor = self.imageColor
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self.updateTitleAndImageColorAlpha(colorAlpha)
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}
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private func updateTitleAndImageAlpha(_ alpha: CGFloat) {
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self.imageView.alpha = alpha
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self.titleLabel.alpha = alpha
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}
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private func updateTitleAndImageColorAlpha(_ alpha: CGFloat) {
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let titleColor: UIColor
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let image: UIImage?
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if alpha < 1.0 {
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titleColor = self.titleColor.withAlphaComponent(alpha)
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image = self.originalImage?.vc_tintedImage(usingColor: self.imageColor.withAlphaComponent(alpha))
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} else {
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titleColor = self.titleColor
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image = self.originalImage
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}
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self.titleLabel.textColor = titleColor
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self.imageView.image = image
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}
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// MARK: - Actions
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@objc private func buttonAction(_ sender: UILongPressGestureRecognizer) {
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guard self.isEnabled else {
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return
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}
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let isBackgroundViewTouched = sender.vc_isTouchingInside()
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switch sender.state {
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case .began, .changed:
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self.isHighlighted = isBackgroundViewTouched
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case .ended:
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self.isHighlighted = false
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if isBackgroundViewTouched {
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self.action?()
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}
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case .cancelled:
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self.isHighlighted = false
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default:
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break
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}
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}
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}
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