7fef4aadb7
updated constant references fixed bug in checkbox Signed-off-by: Matt Bruce <matt.bruce@verizon.com>
459 lines
15 KiB
Swift
459 lines
15 KiB
Swift
//
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// Checkbox.swift
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// VDS
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//
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// Created by Matt Bruce on 7/22/22.
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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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import VDSFormControlsTokens
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import Combine
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/**
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A custom implementation of Apple's UISwitch.
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By default this class begins in the off state.
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Container: The background of the checkbox control.
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Knob: The circular indicator that slides on the container.
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*/
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@objcMembers public class VDSCheckbox: VDSCheckboxBase<DefaultCheckboxModel>{}
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@objcMembers open class VDSCheckboxBase<ModelType: VDSCheckboxModel>: VDSControl<ModelType>, Changable {
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//--------------------------------------------------
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// MARK: - Private Properties
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//--------------------------------------------------
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private func getCheckboxBackgroundColor(for disabled: Bool, surface: Surface) -> (on: UIColor, off: UIColor) {
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if disabled {
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if surface == .light {
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return (
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on: VDSColor.interactiveDisabledOnlight,
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off: .clear)
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} else {
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return (
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on: VDSColor.interactiveDisabledOndark,
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off: .clear
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)
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}
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} else {
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if surface == .light {
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return (
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on: VDSColor.elementsPrimaryOnlight,
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off: .clear
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)
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} else {
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return (
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on: VDSColor.elementsPrimaryOndark,
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off: .clear
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)
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}
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}
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}
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private func getCheckboxBorderColor(for disabled: Bool, surface: Surface) -> (on: UIColor, off: UIColor) {
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if disabled {
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if surface == .light {
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return (
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on: VDSColor.interactiveDisabledOnlight,
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off: VDSColor.interactiveDisabledOnlight
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)
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} else {
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return (
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on: VDSColor.interactiveDisabledOndark,
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off: VDSColor.interactiveDisabledOnlight
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)
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}
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} else {
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if surface == .light {
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return (
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on: VDSColor.elementsPrimaryOnlight,
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off: VDSFormControlsColor.borderOnlight
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)
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} else {
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return (
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on: VDSColor.elementsPrimaryOndark,
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off: VDSFormControlsColor.borderOndark
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)
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}
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}
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}
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private func getCheckboxCheckColor(for disabled: Bool, surface: Surface) -> UIColor {
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if disabled {
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if surface == .light {
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return VDSColor.interactiveDisabledOndark
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} else {
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return VDSColor.interactiveDisabledOnlight
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}
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} else {
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if surface == .light {
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return VDSColor.elementsPrimaryOndark
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} else {
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return VDSColor.elementsPrimaryOnlight
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}
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}
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}
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private var mainStackView: UIStackView = {
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let stackView = UIStackView()
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stackView.translatesAutoresizingMaskIntoConstraints = false
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stackView.alignment = .top
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stackView.axis = .vertical
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return stackView
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}()
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private var checkboxStackView: UIStackView = {
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let stackView = UIStackView()
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stackView.translatesAutoresizingMaskIntoConstraints = false
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stackView.alignment = .top
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stackView.axis = .horizontal
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return stackView
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}()
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private var checkboxLabelStackView: UIStackView = {
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let stackView = UIStackView()
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stackView.translatesAutoresizingMaskIntoConstraints = false
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stackView.axis = .vertical
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return stackView
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}()
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private var primaryLabel: VDSLabel = {
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let label = VDSLabel()
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label.translatesAutoresizingMaskIntoConstraints = false
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return label
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}()
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private var secondaryLabel: VDSLabel = {
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let label = VDSLabel()
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label.translatesAutoresizingMaskIntoConstraints = false
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return label
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}()
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private var errorLabel: VDSLabel = {
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let label = VDSLabel()
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label.translatesAutoresizingMaskIntoConstraints = false
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return label
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}()
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private var checkboxView: CheckBoxView = {
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let view = CheckBoxView()
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view.translatesAutoresizingMaskIntoConstraints = false
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return view
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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 onChange: Blocks.ActionBlock?
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//--------------------------------------------------
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// MARK: - Static Properties
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//--------------------------------------------------
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// Sizes are from InVision design specs.
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public let checkboxSize = CGSize(width: 20, height: 20)
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//--------------------------------------------------
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// MARK: - Computed Properties
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//--------------------------------------------------
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@Proxy(\.model.id)
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public var id: String?
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@Proxy(\.model.inputId)
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public var inputId: String?
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@Proxy(\.model.value)
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public var value: AnyHashable?
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@Proxy(\.model.showError)
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public var showError: Bool
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@Proxy(\.model.errorText)
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public var errorText: String?
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@Proxy(\.model.labelText)
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public var labelText: String?
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@Proxy(\.model.childText)
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public var childText: String?
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@Proxy(\.model.surface)
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public var surface: Surface
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@Proxy(\.model.on)
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open var isOn: Bool
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@Proxy(\.model.disabled)
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open var disabled: Bool
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open override var isEnabled: Bool {
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get { !model.disabled }
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set {
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//create local vars for clear coding
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let disabled = !newValue
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if model.disabled != disabled {
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model.disabled = disabled
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}
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}
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}
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//--------------------------------------------------
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// MARK: - Initializers
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//--------------------------------------------------
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public convenience init() {
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self.init(with: ModelType())
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}
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required public init(with model: ModelType) {
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super.init(with: model)
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}
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required public init?(coder: NSCoder) {
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super.init(with: ModelType())
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}
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//--------------------------------------------------
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// MARK: - Constraints
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//--------------------------------------------------
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private var knobLeadingConstraint: NSLayoutConstraint?
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private var knobTrailingConstraint: NSLayoutConstraint?
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private var knobHeightConstraint: NSLayoutConstraint?
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private var knobWidthConstraint: NSLayoutConstraint?
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private var checkboxHeightConstraint: NSLayoutConstraint?
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private var checkboxWidthConstraint: NSLayoutConstraint?
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//functions
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//--------------------------------------------------
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// MARK: - Lifecycle
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//--------------------------------------------------
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public override func updateView(_ size: CGFloat) {
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super.updateView(size)
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checkboxHeightConstraint?.constant = checkboxSize.height
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checkboxWidthConstraint?.constant = checkboxSize.width
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setCheckboxColor(viewModel: model)
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}
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public override func setupView() {
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super.setupView()
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self.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(VDSCheckbox.toggleAndAction)))
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isAccessibilityElement = true
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accessibilityTraits = .button
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addSubview(mainStackView)
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mainStackView.addArrangedSubview(checkboxStackView)
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mainStackView.addArrangedSubview(errorLabel)
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checkboxStackView.addArrangedSubview(checkboxView)
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checkboxStackView.addArrangedSubview(checkboxLabelStackView)
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checkboxLabelStackView.addArrangedSubview(primaryLabel)
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checkboxLabelStackView.addArrangedSubview(secondaryLabel)
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checkboxHeightConstraint = checkboxView.heightAnchor.constraint(equalToConstant: checkboxSize.height)
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checkboxHeightConstraint?.isActive = true
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checkboxWidthConstraint = checkboxView.widthAnchor.constraint(equalToConstant: checkboxSize.width)
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checkboxWidthConstraint?.isActive = true
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setCheckboxColor(viewModel: model)
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mainStackView.topAnchor.constraint(equalTo: topAnchor).isActive = true
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mainStackView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
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mainStackView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
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mainStackView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
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}
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/// Creates the check mark layer.
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private func setCheckboxColor(viewModel: ModelType) {
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let background = getCheckboxBackgroundColor(for: viewModel.disabled, surface: viewModel.surface)
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let border = getCheckboxBorderColor(for: viewModel.disabled, surface: viewModel.surface)
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let checkColor = getCheckboxCheckColor(for: viewModel.disabled, surface: viewModel.surface)
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let backgroundColor = viewModel.on ? background.on : background.off
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checkboxView.backgroundColor = backgroundColor
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checkboxView.borderColor = viewModel.on ? border.on : border.off
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checkboxView.checkColor = viewModel.on ? checkColor : backgroundColor
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checkboxView.isSelected = viewModel.on
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}
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func ensureLabel(viewModel: ModelType) {
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//deal with labels
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if model.shouldShowLabels {
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//add the stackview to hold the 2 labels
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//top label
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if let labelModel = viewModel.labelModel {
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primaryLabel.set(with: labelModel)
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primaryLabel.isHidden = false
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} else {
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primaryLabel.isHidden = true
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}
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//bottom label
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if let childModel = viewModel.childModel {
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secondaryLabel.set(with: childModel)
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secondaryLabel.isHidden = false
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} else {
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secondaryLabel.isHidden = true
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}
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checkboxStackView.spacing = 12
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checkboxLabelStackView.spacing = 4
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checkboxLabelStackView.isHidden = false
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} else {
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checkboxStackView.spacing = 0
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checkboxLabelStackView.spacing = 0
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checkboxLabelStackView.isHidden = true
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}
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//either add/remove the error from the main stack
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if let errorModel = model.errorModel, model.shouldShowError {
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errorLabel.set(with: errorModel)
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mainStackView.spacing = 8
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errorLabel.isHidden = false
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} else {
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mainStackView.spacing = 0
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errorLabel.isHidden = true
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}
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}
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public override func reset() {
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super.reset()
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setCheckboxColor(viewModel: model)
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setAccessibilityLabel()
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onChange = nil
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}
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//--------------------------------------------------
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// MARK: - Actions
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//--------------------------------------------------
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open override func sendAction(_ action: Selector, to target: Any?, for event: UIEvent?) {
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super.sendAction(action, to: target, for: event)
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toggleAndAction()
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}
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open override func sendActions(for controlEvents: UIControl.Event) {
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super.sendActions(for: controlEvents)
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toggleAndAction()
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}
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/// This will checkbox the state of the Checkbox and execute the actionBlock if provided.
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public func toggleAndAction() {
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isOn.toggle()
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onChange?()
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}
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override open func accessibilityActivate() -> Bool {
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// Hold state in case User wanted isAnimated to remain off.
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guard isUserInteractionEnabled else { return false }
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sendActions(for: .touchUpInside)
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return true
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}
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//--------------------------------------------------
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// MARK: - UIResponder
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//--------------------------------------------------
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open override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
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sendActions(for: .touchUpInside)
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}
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//--------------------------------------------------
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// MARK: - Animations
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//--------------------------------------------------
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/// Follow the SwiftUI View paradigm
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/// - Parameter viewModel: state
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open override func onStateChange(viewModel: ModelType) {
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let enabled = !viewModel.disabled
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ensureLabel(viewModel: viewModel)
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setCheckboxColor(viewModel: viewModel)
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setAccessibilityHint(enabled)
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setAccessibilityValue(viewModel.on)
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setAccessibilityLabel(viewModel.on)
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isUserInteractionEnabled = !viewModel.disabled
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setNeedsLayout()
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layoutIfNeeded()
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}
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private class CheckBoxView: UIView {
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public var borderColor: UIColor = .black
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public var checkColor: UIColor = .white
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public var isSelected: Bool = false {
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didSet {
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if let shapeLayer = shapeLayer, let sublayers = layer.sublayers, sublayers.contains(shapeLayer) {
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shapeLayer.removeFromSuperlayer()
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self.shapeLayer = nil
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}
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}
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}
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/// Manages the appearance of the checkbox.
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private var shapeLayer: CAShapeLayer?
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/// Creates the check mark layer.
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private func drawShapeLayer() {
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layer.borderColor = borderColor.cgColor
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layer.cornerRadius = 2.0
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layer.borderWidth = 1.0
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shapeLayer?.strokeColor = checkColor.cgColor
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guard let path = try? checkMarkPath(), shapeLayer == nil else { return }
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if shapeLayer == nil {
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let shapeLayer = CAShapeLayer()
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self.shapeLayer = shapeLayer
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shapeLayer.frame = bounds
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layer.addSublayer(shapeLayer)
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shapeLayer.strokeColor = checkColor.cgColor
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shapeLayer.fillColor = UIColor.clear.cgColor
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shapeLayer.path = path
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shapeLayer.lineJoin = .miter
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shapeLayer.lineWidth = 2
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CATransaction.withDisabledAnimations {
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shapeLayer.strokeEnd = isSelected ? 1 : 0
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}
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}
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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drawShapeLayer()
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}
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/// - returns: The CGPath of a UIBezierPath detailing the path of a checkmark
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private func checkMarkPath() throws -> CGPath {
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let length = max(bounds.size.height, bounds.size.width)
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guard length > 0.0 else { throw Error.boundsNotSet }
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let xInsetLeft = length * 0.25
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let yInsetTop = length * 0.3
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let innerWidth = length - (xInsetLeft + length * 0.25) // + Right X Inset
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let innerHeight = length - (yInsetTop + length * 0.35) // + Bottom Y Inset
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let startPoint = CGPoint(x: xInsetLeft, y: yInsetTop + (innerHeight / 2))
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let pivotOffSet = CGPoint(x: xInsetLeft + (innerWidth * 0.33), y: yInsetTop + innerHeight)
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let endOffset = CGPoint(x: xInsetLeft + innerWidth, y: yInsetTop)
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let bezierPath = UIBezierPath()
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bezierPath.move(to: startPoint)
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bezierPath.addLine(to: pivotOffSet)
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bezierPath.addLine(to: endOffset)
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return bezierPath.cgPath
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}
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enum Error: Swift.Error {
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case boundsNotSet
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}
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}
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}
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