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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 Common
import UIKit
public enum ToolbarButtonGesture {
case tap
case longPress
}
class ToolbarButton: UIButton, ThemeApplicable {
struct UX {
static let verticalInset: CGFloat = 8
static let horizontalInset: CGFloat = 8
}
var foregroundColorNormal: UIColor = .clear
var foregroundColorHighlighted: UIColor = .clear
var foregroundColorDisabled: UIColor = .clear
var backgroundColorNormal: UIColor = .clear
private var shouldDisplayAsHighlighted = false
private var onLongPress: (() -> Void)?
override init(frame: CGRect) {
super.init(frame: frame)
configuration = UIButton.Configuration.plain()
configuration?.contentInsets = NSDirectionalEdgeInsets(top: UX.verticalInset,
leading: UX.horizontalInset,
bottom: UX.verticalInset,
trailing: UX.horizontalInset)
}
open func configure(element: ToolbarElement) {
guard var config = configuration else {
return
}
removeAllGestureRecognizers()
configureLongPressGestureRecognizerIfNeeded(for: element)
shouldDisplayAsHighlighted = element.shouldDisplayAsHighlighted
let image = UIImage(named: element.iconName)?.withRenderingMode(.alwaysTemplate)
let action = UIAction(title: element.a11yLabel,
image: image,
handler: { _ in
element.onSelected?()
})
config.image = image
isEnabled = element.isEnabled
accessibilityIdentifier = element.a11yId
accessibilityLabel = element.a11yLabel
addAction(action, for: .touchUpInside)
showsLargeContentViewer = true
largeContentTitle = element.a11yLabel
largeContentImage = image
configuration = config
layoutIfNeeded()
}
public required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override public func updateConfiguration() {
guard var updatedConfiguration = configuration else {
return
}
switch state {
case .highlighted:
updatedConfiguration.baseForegroundColor = foregroundColorHighlighted
case .disabled:
updatedConfiguration.baseForegroundColor = foregroundColorDisabled
default:
updatedConfiguration.baseForegroundColor = shouldDisplayAsHighlighted ?
foregroundColorHighlighted :
foregroundColorNormal
}
updatedConfiguration.background.backgroundColor = backgroundColorNormal
configuration = updatedConfiguration
}
private func configureLongPressGestureRecognizerIfNeeded(for element: ToolbarElement) {
guard element.onLongPress != nil else { return }
onLongPress = element.onLongPress
let longPressRecognizer = UILongPressGestureRecognizer(
target: self,
action: #selector(handleLongPress)
)
addGestureRecognizer(longPressRecognizer)
}
private func removeAllGestureRecognizers() {
if let gestureRecognizers = gestureRecognizers {
for recognizer in gestureRecognizers {
removeGestureRecognizer(recognizer)
}
}
}
// MARK: - Selectors
@objc
private func handleLongPress(_ gestureRecognizer: UILongPressGestureRecognizer) {
if gestureRecognizer.state == .began {
let generator = UIImpactFeedbackGenerator(style: .light)
generator.impactOccurred()
onLongPress?()
}
}
// MARK: - ThemeApplicable
public func applyTheme(theme: Theme) {
foregroundColorNormal = theme.colors.iconPrimary
foregroundColorHighlighted = theme.colors.actionPrimary
foregroundColorDisabled = theme.colors.iconDisabled
backgroundColorNormal = .clear
setNeedsUpdateConfiguration()
}
}