102 lines
2.9 KiB
Swift
102 lines
2.9 KiB
Swift
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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import Foundation
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import SnapKit
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fileprivate struct Constants {
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static let verticalOffset = 7.0
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static let horizontalOffset = 20.0
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static let animationStepDuration = 0.7
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}
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class ChatTypingHeaderView: UIView {
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fileprivate let theme: Theme
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fileprivate var bubbleView: BubbleView!
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fileprivate var label: UILabel!
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fileprivate var animationTimer: Timer?
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fileprivate var animationStep: Int = 0
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init(theme: Theme) {
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self.theme = theme
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super.init(frame: CGRect.zero)
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createViews()
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installConstraints()
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}
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required convenience init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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func startAnimation() {
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animationTimer = Timer.scheduledTimer(timeInterval: Constants.animationStepDuration, closure: {[weak self] _ -> Void in
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guard let sself = self else {
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return
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}
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sself.animationStep += 1
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if sself.animationStep > 2 {
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sself.animationStep = 0
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}
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sself.updateDotsString()
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}, repeats: true)
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}
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func stopAnimation() {
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animationTimer?.invalidate()
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animationTimer = nil
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}
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}
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private extension ChatTypingHeaderView {
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func createViews() {
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bubbleView = BubbleView()
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bubbleView.text = " "
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bubbleView.backgroundColor = theme.colorForType(.ChatIncomingBubble)
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bubbleView.isUserInteractionEnabled = false
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addSubview(bubbleView)
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label = UILabel()
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addSubview(label)
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updateDotsString()
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}
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func installConstraints() {
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bubbleView.snp.makeConstraints() {
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$0.top.equalTo(self).offset(Constants.verticalOffset)
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$0.bottom.equalTo(self).offset(-Constants.verticalOffset)
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$0.leading.equalTo(self).offset(Constants.horizontalOffset)
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}
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label.snp.makeConstraints() {
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$0.center.equalTo(bubbleView)
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}
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}
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func updateDotsString() {
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let mutable = NSMutableAttributedString()
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let font = UIFont.systemFont(ofSize: 22.0)
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let colorNormal = theme.colorForType(.ChatInformationText)
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let colorSelected = colorNormal.darkerColor().darkerColor()
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for i in 0..<3 {
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let color = (i == animationStep) ? colorSelected : colorNormal
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// HINT: u{2022} --> UTF-8 BULLET --> e2 80 a2
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mutable.append(NSMutableAttributedString(string: "\u{2022}",
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attributes: [NSAttributedStringKey.font : font,
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NSAttributedStringKey.foregroundColor: color]))
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}
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label.attributedText = mutable
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}
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}
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