mirror of
https://github.com/vector-im/element-ios.git
synced 2024-09-29 07:42:40 +00:00
128 lines
3.9 KiB
Swift
128 lines
3.9 KiB
Swift
//
|
|
// Copyright 2022 New Vector Ltd
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
|
|
import Foundation
|
|
import UIKit
|
|
|
|
/// `BreadcrumbView` can be used to display a path into a single line of text and manages ellipsis.
|
|
@objcMembers
|
|
class BreadcrumbView: UIView, Themable {
|
|
|
|
// MARK: - Constants
|
|
|
|
private enum Constants {
|
|
static let separator: String = "/"
|
|
}
|
|
|
|
// MARK: - Properties
|
|
|
|
public var breadcrumbs: [String] = [] {
|
|
didSet {
|
|
populateLabels()
|
|
}
|
|
}
|
|
|
|
// MARK: - Private
|
|
|
|
private var labels: [UILabel] = []
|
|
|
|
// MARK: - Lifecycle
|
|
|
|
override init(frame: CGRect) {
|
|
super.init(frame: frame)
|
|
}
|
|
|
|
required init?(coder: NSCoder) {
|
|
super.init(coder: coder)
|
|
}
|
|
|
|
// MARK: - Themable
|
|
|
|
func update(theme: Theme) {
|
|
for label in labels {
|
|
update(theme: theme, for: label)
|
|
}
|
|
}
|
|
|
|
// MARK: - Private
|
|
|
|
private func populateLabels() {
|
|
for label in labels {
|
|
label.removeFromSuperview()
|
|
}
|
|
|
|
labels.removeAll()
|
|
|
|
for (index, breadcrumb) in breadcrumbs.enumerated() {
|
|
if index > 0 {
|
|
createLabel(with: Constants.separator, at: index)
|
|
}
|
|
createLabel(with: breadcrumb, at: index)
|
|
}
|
|
self.layoutIfNeeded()
|
|
}
|
|
|
|
private func createLabel(with text: String?, at index: Int) {
|
|
guard let text = text, !text.isEmpty else {
|
|
return
|
|
}
|
|
|
|
let label = UILabel(frame: .zero)
|
|
label.backgroundColor = .clear
|
|
label.text = text
|
|
let priority: UILayoutPriority
|
|
if index < breadcrumbs.count - 1 {
|
|
// We put a higher priority to the first element then decrease the priority linearly for the next elements.
|
|
priority = UILayoutPriority(UILayoutPriority.defaultLow.rawValue + Float(breadcrumbs.count * 2 - labels.count))
|
|
} else {
|
|
// The last element has the highest priority
|
|
priority = .defaultHigh
|
|
}
|
|
label.setContentCompressionResistancePriority(priority, for: .horizontal)
|
|
|
|
update(theme: ThemeService.shared().theme, for: label)
|
|
|
|
self.addSubview(label)
|
|
self.labels.append(label)
|
|
|
|
label.translatesAutoresizingMaskIntoConstraints = false
|
|
label.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor).isActive = true
|
|
label.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor).isActive = true
|
|
|
|
if let prevSibling = prevSibling(of: label) {
|
|
label.leadingAnchor.constraint(equalTo: prevSibling.trailingAnchor).isActive = true
|
|
} else {
|
|
label.leadingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leadingAnchor).isActive = true
|
|
}
|
|
|
|
if index == breadcrumbs.count - 1 && label.text != Constants.separator {
|
|
label.trailingAnchor.constraint(equalTo: self.safeAreaLayoutGuide.trailingAnchor).isActive = true
|
|
}
|
|
}
|
|
|
|
private func prevSibling(of label: UILabel) -> UILabel? {
|
|
guard let index = labels.firstIndex(of: label), index - 1 >= 0 else {
|
|
return nil
|
|
}
|
|
|
|
return labels[index-1]
|
|
}
|
|
|
|
private func update(theme: Theme, for label: UILabel) {
|
|
label.textColor = theme.colors.tertiaryContent
|
|
label.font = theme.fonts.footnote
|
|
}
|
|
}
|