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//
// AccountInputGroupView.swift
// MullvadVPN
//
// Created by pronebird on 22/03/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
class AccountInputGroupView: UIView {
let textField: AccountTextField = {
let textField = AccountTextField()
textField.font = UIFont.systemFont(ofSize: 20)
textField.translatesAutoresizingMaskIntoConstraints = false
textField.attributedPlaceholder = NSAttributedString(
string: "0000 0000 0000 0000",
attributes: [.foregroundColor: UIColor.lightGray])
textField.textContentType = .username
textField.clearButtonMode = .never
textField.autocapitalizationType = .none
textField.autocorrectionType = .no
textField.smartDashesType = .no
textField.smartInsertDeleteType = .no
textField.smartQuotesType = .no
textField.spellCheckingType = .no
textField.keyboardType = .numberPad
return textField
}()
enum Style {
case normal, error, authenticating
}
var loginState = LoginState.default {
didSet {
updateAppearance()
updateTextFieldEnabled()
}
}
private let borderRadius = CGFloat(8)
private let borderWidth = CGFloat(2)
private var borderColor: UIColor {
switch loginState {
case .default:
return textField.isEditing
? UIColor.AccountTextField.NormalState.borderColor
: UIColor.clear
case .failure:
return UIColor.AccountTextField.ErrorState.borderColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.borderColor
}
}
private var textColor: UIColor {
switch loginState {
case .default:
return UIColor.AccountTextField.NormalState.textColor
case .failure:
return UIColor.AccountTextField.ErrorState.textColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.textColor
}
}
private var backgroundLayerColor: UIColor {
switch loginState {
case .default:
return UIColor.AccountTextField.NormalState.backgroundColor
case .failure:
return UIColor.AccountTextField.ErrorState.backgroundColor
case .authenticating, .success:
return UIColor.AccountTextField.AuthenticatingState.backgroundColor
}
}
private let borderLayer = CAShapeLayer()
private let backgroundLayer = CAShapeLayer()
private let maskLayer = CALayer()
// MARK: - View lifecycle
override init(frame: CGRect) {
super.init(frame: frame)
addSubview(textField)
NSLayoutConstraint.activate([
textField.topAnchor.constraint(equalTo: topAnchor),
textField.leadingAnchor.constraint(equalTo: leadingAnchor),
textField.trailingAnchor.constraint(equalTo: trailingAnchor),
textField.bottomAnchor.constraint(equalTo: bottomAnchor),
])
setupView()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// MARK: - CALayerDelegate
override func layoutSublayers(of layer: CALayer) {
super.layoutSublayers(of: layer)
guard layer == self.layer else { return }
// extend the border frame outside of the content area
let borderFrame = layer.bounds.insetBy(dx: -borderWidth * 0.5, dy: -borderWidth * 0.5)
// create a bezier path for border
let borderPath = borderBezierPath(size: borderFrame.size)
// update the background layer mask
maskLayer.frame.size = borderFrame.size
maskLayer.contents = backgroundMaskImage(borderPath: borderPath).cgImage
backgroundLayer.frame = borderFrame
borderLayer.path = borderPath.cgPath
borderLayer.frame = borderFrame
}
// MARK: - Notifications
@objc func textDidBeginEditing() {
updateAppearance()
}
@objc func textDidEndEditing() {
updateAppearance()
}
// MARK: - Private
private func setupView() {
backgroundColor = UIColor.clear
borderLayer.lineWidth = borderWidth
borderLayer.fillColor = UIColor.clear.cgColor
backgroundLayer.mask = maskLayer
layer.insertSublayer(borderLayer, at: 0)
layer.insertSublayer(backgroundLayer, at: 0)
updateAppearance()
updateTextFieldEnabled()
addTextFieldNotificationObservers()
}
private func addTextFieldNotificationObservers() {
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self,
selector: #selector(textDidBeginEditing),
name: UITextField.textDidBeginEditingNotification,
object: textField)
notificationCenter.addObserver(self,
selector: #selector(textDidEndEditing),
name: UITextField.textDidEndEditingNotification,
object: textField)
}
private func updateAppearance() {
borderLayer.strokeColor = borderColor.cgColor
backgroundLayer.backgroundColor = backgroundLayerColor.cgColor
textField.textColor = textColor
}
private func updateTextFieldEnabled() {
switch loginState {
case .authenticating, .success:
textField.isEnabled = false
default:
textField.isEnabled = true
}
}
private func borderBezierPath(size: CGSize) -> UIBezierPath {
let borderPath = UIBezierPath(roundedRect: CGRect(origin: .zero, size: size), cornerRadius: borderRadius)
borderPath.lineWidth = borderWidth
return borderPath
}
private func backgroundMaskImage(borderPath: UIBezierPath) -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: borderPath.bounds)
return renderer.image { (ctx) in
borderPath.fill()
// strip out any overlapping pixels between the border and the background
borderPath.stroke(with: .clear, alpha: 0)
}
}
}
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