298 lines
11 KiB
Swift
298 lines
11 KiB
Swift
//
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// Tabs.swift
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// VDS
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//
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// Created by Matt Bruce on 5/18/23.
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//
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import Foundation
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import UIKit
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import VDSColorTokens
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public class Tabs: View {
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//--------------------------------------------------
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// MARK: - Enums
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//--------------------------------------------------
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public enum Orientation: String, CaseIterable{
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case vertical
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case horizontal
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}
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public enum IndicatorPosition: String, CaseIterable {
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case top
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case bottom
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var value: UIRectEdge {
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if self == .top {
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return .top
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} else {
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return .bottom
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}
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}
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}
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public enum Overflow: String, CaseIterable {
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case scroll
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case none
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}
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public enum Size: String, CaseIterable {
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case medium
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case large
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public var textStyle: TextStyle {
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if self == .medium {
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return .boldBodyLarge
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} else {
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//specs show that the font size shouldn't change however boldTitleSmall does
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//change point size between iPad/iPhone. This is a "fix" so each device will
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//load the correct pointSize
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return UIDevice.isIPad ? .boldTitleSmall : .boldTitleMedium
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}
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}
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}
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public enum Width {
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case percentage(CGFloat)
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case value(CGFloat)
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}
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//--------------------------------------------------
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// MARK: - Public Properties
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//--------------------------------------------------
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public var onTabChange: ((Int) -> Void)?
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public var orientation: Orientation = .horizontal { didSet { updateTabItems() } }
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public var borderLine: Bool = true { didSet { setNeedsUpdate() } }
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public var fillContainer: Bool = false { didSet { updateTabItems() } }
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public var indicatorFillTab: Bool = false { didSet { setNeedsUpdate() } }
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public var indicatorPosition: IndicatorPosition = .bottom { didSet { setNeedsUpdate() } }
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public var minWidth: CGFloat = 44.0 { didSet { setNeedsUpdate() } }
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public var overflow: Overflow = .scroll { didSet { updateTabItems() } }
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public var selectedIndex: Int = 0 { didSet { setNeedsUpdate() } }
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public var size: Size = .medium { didSet { setNeedsUpdate() } }
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public var sticky: Bool = false { didSet { setNeedsUpdate() } }
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public var tabModels: [TabModel] = [] { didSet { updateTabItems() } }
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//rules for width
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private var _width: Width = .percentage(0.25)
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public var width: Width {
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get {
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return _width
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}
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set {
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switch newValue {
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case .percentage(let percentage):
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if percentage >= 0 && percentage <= 1 {
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_width = newValue
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setNeedsUpdate()
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} else {
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print("Invalid percentage value. It should be between 0 and 1.")
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}
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case .value(let value):
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if value >= minWidth {
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_width = newValue
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setNeedsUpdate()
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} else {
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print("Invalid value. It should be greater than or equal to \(minWidth).")
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}
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}
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}
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}
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//--------------------------------------------------
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// MARK: - Private Properties
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//--------------------------------------------------
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private var tabItems: [TabItem] = []
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private var tabStackView: UIStackView!
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private var scrollView: UIScrollView!
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private var contentView: View!
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private var borderlineColorConfig = SurfaceColorConfiguration(VDSColor.elementsLowcontrastOnlight, VDSColor.elementsLowcontrastOndark)
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private var contentViewWidthConstraint: NSLayoutConstraint?
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//--------------------------------------------------
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// MARK: - Initializers
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//--------------------------------------------------
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public override init(frame: CGRect) {
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super.init(frame: frame)
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}
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public convenience required init() {
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self.init(frame: .zero)
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}
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public required init?(coder: NSCoder) {
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super.init(coder: coder)
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}
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//--------------------------------------------------
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// MARK: - Overrides
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//--------------------------------------------------
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open override func setup() {
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super.setup()
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scrollView = UIScrollView()
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scrollView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.showsHorizontalScrollIndicator = false
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scrollView.showsVerticalScrollIndicator = false
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addSubview(scrollView)
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contentView = View()
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contentView.translatesAutoresizingMaskIntoConstraints = false
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scrollView.addSubview(contentView)
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tabStackView = UIStackView()
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tabStackView.axis = .horizontal
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tabStackView.distribution = .fill
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tabStackView.translatesAutoresizingMaskIntoConstraints = false
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contentView.addSubview(tabStackView)
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scrollView.pinToSuperView()
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contentView.pinToSuperView()
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tabStackView.pinToSuperView()
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contentView.heightAnchor.constraint(equalTo: scrollView.heightAnchor).isActive = true
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}
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private func updateTabItems() {
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updateTabItems(with: tabModels)
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}
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private func updateTabItems(with models: [TabModel]) {
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// Clear existing tab items
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for tabItem in tabItems {
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tabItem.removeFromSuperview()
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}
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tabItems.removeAll()
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// Create new tab items from the models
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for model in models {
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let tabItem = TabItem()
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tabItem.text = model.text
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tabItem.onClick = model.onClick
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tabItem.width = model.width
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tabItems.append(tabItem)
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tabStackView.addArrangedSubview(tabItem)
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tabItem
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.publisher(for: UITapGestureRecognizer())
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.sink { [weak self] gesture in
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guard let self, let tabItem = gesture.view as? TabItem else { return }
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if let selectedIndex = tabItems.firstIndex(of: tabItem) {
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self.selectedIndex = selectedIndex
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self.onTabChange?(selectedIndex)
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}
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}.store(in: &tabItem.subscribers)
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}
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setNeedsUpdate()
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scrollToSelectedIndex(animated: false)
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}
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private func scrollToSelectedIndex(animated: Bool) {
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if orientation == .horizontal && self.overflow == .scroll, selectedIndex < tabItems.count {
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let selectedTab = tabItems[selectedIndex]
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scrollView.scrollRectToVisible(selectedTab.frame, animated: animated)
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}
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}
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open override func updateView() {
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super.updateView()
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if orientation == .horizontal && fillContainer {
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tabStackView.distribution = .fillEqually
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} else {
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tabStackView.distribution = .fill
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}
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// Update tab appearance based on properties
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for (index, tabItem) in tabItems.enumerated() {
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tabItem.selected = selectedIndex == index
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tabItem.size = size
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tabItem.orientation = orientation
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tabItem.surface = surface
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tabItem.indicatorPosition = indicatorPosition
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tabItem.width = tabWidth(for: tabItem)
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}
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tabStackView.axis = orientation == .horizontal ? .horizontal : .vertical
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tabStackView.alignment = orientation == .horizontal ? .fill : .leading
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tabStackView.spacing = orientation == .horizontal ? VDSLayout.Spacing.space6X.value : VDSLayout.Spacing.space4X.value
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// Deactivate old constraint
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contentViewWidthConstraint?.isActive = false
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// Apply width
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if orientation == .vertical {
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scrollView.isScrollEnabled = false
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switch width {
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case .percentage(let amount):
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contentViewWidthConstraint = contentView.widthAnchor.constraint(equalTo: widthAnchor, multiplier: amount)
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case .value(let amount):
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contentViewWidthConstraint = contentView.widthAnchor.constraint(equalToConstant: amount)
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}
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} else {
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// Apply overflow
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if overflow == .scroll && !fillContainer {
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let contentWidth = tabStackView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).width
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contentViewWidthConstraint = contentView.widthAnchor.constraint(equalToConstant: contentWidth)
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// Enable scrolling if necessary
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scrollView.contentSize = CGSize(width: contentWidth, height: scrollView.bounds.height)
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} else {
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contentViewWidthConstraint = contentView.widthAnchor.constraint(equalTo: widthAnchor)
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}
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}
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scrollView.isScrollEnabled = orientation == .horizontal && overflow == .scroll
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// Activate old constraint
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contentViewWidthConstraint?.isActive = true
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setNeedsLayout()
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layoutIfNeeded()
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}
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open override func layoutSubviews() {
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super.layoutSubviews()
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//scrollView Contentsize
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if orientation == .horizontal && overflow == .scroll && !fillContainer {
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let contentWidth = tabStackView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).width
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scrollView.contentSize = CGSize(width: contentWidth, height: scrollView.bounds.height)
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} else {
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scrollView.contentSize = bounds.size
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}
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// Apply border line
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layer.remove(layerName: "borderLineLayer")
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if borderLine {
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let borderLineLayer = CALayer()
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borderLineLayer.name = "borderLineLayer"
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borderLineLayer.backgroundColor = borderlineColorConfig.getColor(self).cgColor
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if orientation == .horizontal {
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borderLineLayer.frame = CGRect(x: 0, y: bounds.height - 1, width: bounds.width, height: 1)
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} else {
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borderLineLayer.frame = CGRect(x: 0, y: 0, width: 1, height: bounds.height)
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}
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layer.addSublayer(borderLineLayer)
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}
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scrollToSelectedIndex(animated: true)
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}
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//--------------------------------------------------
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// MARK: - Private Methods
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//--------------------------------------------------
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private func tabWidth(for item: TabItem) -> CGFloat? {
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guard orientation == .vertical else { return item.width }
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var calculated: CGFloat
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switch width {
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case .percentage(let percent):
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calculated = (bounds.width * percent) - tabStackView.spacing
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case .value(let value):
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calculated = value - tabStackView.spacing
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}
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return calculated > minWidth ? calculated : minWidth
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}
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}
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