Revision control
Copy as Markdown
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import Foundation
import Common
import UIKit
public class ContextualHintView: UIView, ThemeApplicable {
private var viewModel: ContextualHintViewModel?
struct UX {
static let closeButtonSize = CGSize(width: 35, height: 35)
static let closeButtonTrailing: CGFloat = 5
static let closeButtonTop: CGFloat = 23
static let closeButtonBottom: CGFloat = 12
static let closeButtonInsets = NSDirectionalEdgeInsets(top: 0, leading: 7.5, bottom: 15, trailing: 7.5)
static let actionButtonInsets = NSDirectionalEdgeInsets(top: 0, leading: 0, bottom: 0, trailing: 0)
static let stackViewLeading: CGFloat = 16
static let stackViewTopArrowTopConstraint: CGFloat = 16
static let stackViewBottomArrowTopConstraint: CGFloat = 5
static let stackViewTrailing: CGFloat = 3
static let heightSpacing: CGFloat = UX.stackViewTopArrowTopConstraint + UX.stackViewBottomArrowTopConstraint
}
// MARK: - UI Elements
private lazy var contentContainer: UIView = .build { _ in }
private lazy var closeButton: UIButton = .build { button in
button.setImage(UIImage(named: StandardImageIdentifiers.Medium.cross)?.withRenderingMode(.alwaysTemplate),
for: .normal)
button.addTarget(self, action: #selector(self.didTapCloseButton), for: .touchUpInside)
button.configuration = .plain()
button.configuration?.contentInsets = UX.closeButtonInsets
}
private lazy var titleLabel: UILabel = .build { label in
label.font = FXFontStyles.Regular.headline.scaledFont()
label.textAlignment = .left
label.numberOfLines = 0
label.adjustsFontForContentSizeCategory = true
}
private lazy var descriptionLabel: UILabel = .build { label in
label.font = FXFontStyles.Regular.body.scaledFont()
label.textAlignment = .left
label.numberOfLines = 0
label.adjustsFontForContentSizeCategory = true
}
private lazy var actionButton: LinkButton = .build { button in
button.titleLabel?.textAlignment = .left
button.titleLabel?.numberOfLines = 0
button.addTarget(self, action: #selector(self.didTapActionButton), for: .touchUpInside)
}
private lazy var stackView: UIStackView = .build { stack in
stack.backgroundColor = .clear
stack.distribution = .fillProportionally
stack.alignment = .leading
stack.axis = .vertical
stack.spacing = 7.0
}
private lazy var scrollView: FadeScrollView = .build { view in
view.backgroundColor = .clear
view.showsHorizontalScrollIndicator = false
}
private lazy var gradient: CAGradientLayer = {
let gradient = CAGradientLayer()
gradient.type = .axial
gradient.startPoint = CGPoint(x: 1, y: 0)
gradient.endPoint = CGPoint(x: 0, y: 1)
gradient.locations = [0, 0.63]
return gradient
}()
override public func layoutSubviews() {
super.layoutSubviews()
gradient.frame = bounds
}
public func configure(viewModel: ContextualHintViewModel) {
self.viewModel = viewModel
let actionButtonViewModel = LinkButtonViewModel(
title: viewModel.actionButtonTitle,
a11yIdentifier: viewModel.actionButtonA11yId,
contentInsets: UX.actionButtonInsets
)
actionButton.configure(viewModel: actionButtonViewModel)
closeButton.accessibilityLabel = viewModel.closeButtonA11yLabel
descriptionLabel.text = viewModel.description
layer.addSublayer(gradient)
addSubview(scrollView)
addSubview(closeButton)
scrollView.addSubview(contentContainer)
contentContainer.addSubview(stackView)
if !viewModel.title.isEmpty {
titleLabel.text = viewModel.title
stackView.addArrangedSubview(titleLabel)
}
stackView.addArrangedSubview(descriptionLabel)
if viewModel.isActionType { stackView.addArrangedSubview(actionButton) }
setupConstraints()
}
private func setupConstraints() {
guard let viewModel else { return }
let isArrowUp = viewModel.arrowDirection == .up
let topPadding = isArrowUp ? UX.stackViewTopArrowTopConstraint : UX.stackViewBottomArrowTopConstraint
let closeButtonPadding = isArrowUp ? UX.closeButtonTop : UX.closeButtonBottom
NSLayoutConstraint.activate([
heightAnchor.constraint(equalTo: stackView.heightAnchor, constant: UX.heightSpacing),
scrollView.leadingAnchor.constraint(equalTo: leadingAnchor),
scrollView.topAnchor.constraint(equalTo: topAnchor),
scrollView.trailingAnchor.constraint(equalTo: trailingAnchor),
scrollView.bottomAnchor.constraint(equalTo: bottomAnchor),
scrollView.frameLayoutGuide.widthAnchor.constraint(equalTo: contentContainer.widthAnchor),
scrollView.contentLayoutGuide.leadingAnchor.constraint(equalTo: contentContainer.leadingAnchor),
scrollView.contentLayoutGuide.topAnchor.constraint(equalTo: contentContainer.topAnchor),
scrollView.contentLayoutGuide.trailingAnchor.constraint(equalTo: contentContainer.trailingAnchor),
scrollView.contentLayoutGuide.bottomAnchor.constraint(equalTo: contentContainer.bottomAnchor),
closeButton.topAnchor.constraint(equalTo: topAnchor, constant: closeButtonPadding),
closeButton.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -UX.closeButtonTrailing),
closeButton.heightAnchor.constraint(equalToConstant: UX.closeButtonSize.height),
closeButton.widthAnchor.constraint(equalToConstant: UX.closeButtonSize.width),
stackView.topAnchor.constraint(equalTo: contentContainer.topAnchor, constant: topPadding),
stackView.leadingAnchor.constraint(equalTo: contentContainer.leadingAnchor,
constant: UX.stackViewLeading),
stackView.trailingAnchor.constraint(equalTo: contentContainer.trailingAnchor,
constant: -UX.closeButtonSize.width - UX.stackViewTrailing),
stackView.bottomAnchor.constraint(equalTo: contentContainer.bottomAnchor)
])
setNeedsLayout()
layoutIfNeeded()
}
@objc
private func didTapCloseButton(sender: UIButton) {
viewModel?.closeButtonAction?(sender)
}
@objc
private func didTapActionButton(sender: UIButton) {
viewModel?.actionButtonAction?(sender)
}
public func applyTheme(theme: Theme) {
closeButton.tintColor = theme.colors.textOnDark
titleLabel.textColor = theme.colors.textOnDark
descriptionLabel.textColor = theme.colors.textOnDark
gradient.colors = theme.colors.layerGradient.cgColors
guard let viewModel else { return }
if viewModel.isActionType {
let textAttributes: [NSAttributedString.Key: Any] = [
.font: FXFontStyles.Regular.body.scaledFont(),
.foregroundColor: theme.colors.textOnDark,
.underlineStyle: NSUnderlineStyle.single.rawValue
]
let attributeString = NSMutableAttributedString(
string: viewModel.actionButtonTitle,
attributes: textAttributes
)
actionButton.setAttributedTitle(attributeString, for: .normal)
}
}
}