adds MOTU audio settings

XIONControlPanel/Views/AudioSectionView.swift

@@ -0,0 +1,120 @@
+//
+//  AudioSectionView.swift
+//  XIONControlPanel
+//
+
+import UIKit
+
+final class AudioSectionView: UIView
+{
+    var mixerSettingsHandler: (() -> Void)?
+
+    private let _label = UILabel(frame: .zero)
+    private let _mixerSettingsButton = AudioActionButton(type: .custom)
+
+    override init(frame: CGRect)
+    {
+        super.init(frame: frame)
+
+        _label.font = UIFont(name: "Orbitron-Medium", size: 14.0)
+        _label.text = "audio"
+        _label.textColor = .white.withAlphaComponent(0.8)
+        addSubview(_label)
+
+        _mixerSettingsButton.setTitle("MIXER SETTINGS", for: .normal)
+        _mixerSettingsButton.titleLabel?.font = UIFont(name: "Orbitron-Medium", size: 21.0)
+        _mixerSettingsButton.setTitleColor(.white, for: .normal)
+        _mixerSettingsButton.accessibilityIdentifier = "audio.mixerSettings"
+        _mixerSettingsButton.accessibilityLabel = "Mixer Settings"
+        _mixerSettingsButton.addTarget(self, action: #selector(_showMixerSettings), for: .touchUpInside)
+        addSubview(_mixerSettingsButton)
+    }
+
+    required init?(coder: NSCoder)
+    {
+        fatalError("unsupported")
+    }
+
+    override func layoutSubviews()
+    {
+        super.layoutSubviews()
+
+        let labelSpacing: CGFloat = 8.0
+        let labelSize = _label.sizeThatFits(bounds.size)
+        _label.frame = CGRect(
+            x: 0.0,
+            y: 0.0,
+            width: labelSize.width,
+            height: labelSize.height
+        )
+        _mixerSettingsButton.frame = CGRect(
+            x: 0.0,
+            y: _label.frame.maxY + labelSpacing,
+            width: bounds.width,
+            height: max(0.0, bounds.height - _label.frame.height - labelSpacing)
+        )
+    }
+
+    static func preferredHeight(forWidth width: CGFloat) -> CGFloat
+    {
+        let cellsPerRow: CGFloat
+        switch width {
+        case 500.0...:
+            cellsPerRow = 4.0
+        case 400.0..<500.0:
+            cellsPerRow = 3.0
+        default:
+            cellsPerRow = 2.0
+        }
+
+        let cellSpacing: CGFloat = 5.0
+        let cellDimension = floor(
+            (width / cellsPerRow) - ((cellSpacing * (cellsPerRow - 1.0)) / cellsPerRow)
+        )
+        let buttonHeight = rint(cellDimension / 1.5)
+        return 17.0 + 8.0 + buttonHeight
+    }
+
+    @objc private func _showMixerSettings()
+    {
+        mixerSettingsHandler?()
+    }
+}
+
+private final class AudioActionButton: UIButton
+{
+    private static let normalBackgroundColor = UIColor(white: 0.2, alpha: 1.0)
+    private static let highlightedBackgroundColor = UIColor(white: 0.8, alpha: 1.0)
+
+    override init(frame: CGRect)
+    {
+        super.init(frame: frame)
+        backgroundColor = Self.normalBackgroundColor
+        accessibilityTraits = .button
+    }
+
+    required init?(coder: NSCoder)
+    {
+        fatalError("unsupported")
+    }
+
+    override var isHighlighted: Bool
+    {
+        didSet
+        {
+            if isHighlighted {
+                backgroundColor = Self.highlightedBackgroundColor
+            } else {
+                UIView.animate(
+                    withDuration: 0.35,
+                    delay: 0.0,
+                    options: [.allowUserInteraction, .beginFromCurrentState],
+                    animations: {
+                        self.backgroundColor = Self.normalBackgroundColor
+                    },
+                    completion: nil
+                )
+            }
+        }
+    }
+}