110 lines
4.3 KiB
Swift
110 lines
4.3 KiB
Swift
//
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// NavigationActionView.swift
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// Mastodon
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//
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// Created by MainasuK on 2021-12-31.
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//
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import UIKit
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import MastodonUI
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import MastodonAsset
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import MastodonLocalization
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final class NavigationActionView: UIView {
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static let buttonHeight: CGFloat = 50
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static let minimumBackButtonWidth: CGFloat = 100
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private var observations = Set<NSKeyValueObservation>()
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let buttonContainer: UIStackView = {
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let stackView = UIStackView()
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stackView.axis = .horizontal
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stackView.spacing = 18
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return stackView
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}()
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let backButtonShadowContainer = ShadowBackgroundContainer()
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let backButton: PrimaryActionButton = {
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let button = PrimaryActionButton()
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button.action = .back
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button.contentEdgeInsets = WelcomeViewController.actionButtonPadding
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button.titleLabel?.adjustsFontForContentSizeCategory = true
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button.setTitle(L10n.Common.Controls.Actions.back, for: .normal)
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return button
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}()
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let nextButtonShadowContainer = ShadowBackgroundContainer()
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let nextButton: PrimaryActionButton = {
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let button = PrimaryActionButton()
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button.action = .next
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button.contentEdgeInsets = WelcomeViewController.actionButtonPadding
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button.titleLabel?.adjustsFontForContentSizeCategory = true
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button.setTitle(L10n.Common.Controls.Actions.next, for: .normal)
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return button
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}()
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var hidesBackButton: Bool = false {
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didSet { backButtonShadowContainer.isHidden = hidesBackButton }
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}
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var hidesNextButton: Bool = false {
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didSet { nextButtonShadowContainer.isHidden = hidesNextButton }
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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_init()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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_init()
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}
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}
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extension NavigationActionView {
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private func _init() {
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buttonContainer.translatesAutoresizingMaskIntoConstraints = false
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buttonContainer.preservesSuperviewLayoutMargins = true
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addSubview(buttonContainer)
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NSLayoutConstraint.activate([
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buttonContainer.topAnchor.constraint(equalTo: topAnchor, constant: 16),
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buttonContainer.leadingAnchor.constraint(equalTo: readableContentGuide.leadingAnchor),
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buttonContainer.trailingAnchor.constraint(equalTo: readableContentGuide.trailingAnchor),
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safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: buttonContainer.bottomAnchor, constant: 8),
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])
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backButtonShadowContainer.translatesAutoresizingMaskIntoConstraints = false
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buttonContainer.addArrangedSubview(backButtonShadowContainer)
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nextButtonShadowContainer.translatesAutoresizingMaskIntoConstraints = false
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buttonContainer.addArrangedSubview(nextButtonShadowContainer)
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NSLayoutConstraint.activate([
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backButtonShadowContainer.heightAnchor.constraint(greaterThanOrEqualToConstant: NavigationActionView.buttonHeight).priority(.required - 1),
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nextButtonShadowContainer.heightAnchor.constraint(greaterThanOrEqualToConstant: NavigationActionView.buttonHeight).priority(.required - 1),
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])
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backButton.translatesAutoresizingMaskIntoConstraints = false
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backButtonShadowContainer.addSubview(backButton)
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backButton.pinToParent()
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nextButton.translatesAutoresizingMaskIntoConstraints = false
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nextButtonShadowContainer.addSubview(nextButton)
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nextButton.pinToParent()
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// We want the back button to be as small as possible, allowing the next button to take up
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// any remaining space. .defaultLow is "the priority level at which a button hugs its
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// contents horizontally". Setting this on backButton allows nextButton to eat up remaining
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// space. Note that we have to set this on the backButton, not the container, because it's
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// backButton's size that determines the compression amount.
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backButton.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
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// Ensure that the back button has a reasonable minimum tap area.
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NSLayoutConstraint.activate([
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backButton.widthAnchor.constraint(greaterThanOrEqualToConstant: NavigationActionView.minimumBackButtonWidth).priority(.defaultLow - 1)
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])
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}
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}
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