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// 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 UIKit
import Common
final class TabNumberButton: ToolbarButton {
// MARK: - UX Constants
struct UX {
static let cornerRadius: CGFloat = 2
static let dimmedOpacity: CGFloat = 0.2
static let titleFont = FXFontStyles.Bold.caption2.systemFont()
// Tab count related constants
static let defaultCountLabelText = "0"
static let maxTabCount = 99
static let infinitySymbol = "\u{221E}"
}
// MARK: - Properties
private lazy var countLabel: UILabel = .build { label in
label.text = UX.defaultCountLabelText
label.font = UX.titleFont
label.layer.cornerRadius = UX.cornerRadius
label.textAlignment = .center
}
// MARK: - Init
override init(frame: CGRect) {
super.init(frame: frame)
setupLayout()
}
public required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override public func configure(element: ToolbarElement) {
super.configure(element: element)
guard let numberOfTabs = element.numberOfTabs else { return }
updateTabCount(numberOfTabs)
}
override func tintColorDidChange() {
super.tintColorDidChange()
if tintAdjustmentMode == .dimmed {
UIView.performWithoutAnimation { countLabel.alpha = UX.dimmedOpacity }
} else { countLabel.alpha = 1.0 }
}
private func updateTabCount(_ count: Int) {
let count = max(count, 1)
let countToBe = (count <= UX.maxTabCount) ? count.description : UX.infinitySymbol
countLabel.text = countToBe
accessibilityValue = countToBe
}
// MARK: - Layout
private func setupLayout() {
addSubview(countLabel)
NSLayoutConstraint.activate([
countLabel.topAnchor.constraint(equalTo: topAnchor),
countLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
countLabel.trailingAnchor.constraint(equalTo: trailingAnchor),
countLabel.bottomAnchor.constraint(equalTo: bottomAnchor)
])
}
}