From ccd1672e7252de9e0e88279a91044d82d46e49f7 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Sat, 21 Jan 2023 13:14:16 -0500
Subject: [PATCH] Show highlight on expand thread cell selection

---
 .../ExpandThreadCollectionViewCell.swift      | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/Tusker/Screens/Conversation/ExpandThreadCollectionViewCell.swift b/Tusker/Screens/Conversation/ExpandThreadCollectionViewCell.swift
index 5a40676b..e7e1400d 100644
--- a/Tusker/Screens/Conversation/ExpandThreadCollectionViewCell.swift
+++ b/Tusker/Screens/Conversation/ExpandThreadCollectionViewCell.swift
@@ -8,7 +8,7 @@
 
 import UIKit
 
-class ExpandThreadCollectionViewCell: UICollectionViewCell {
+class ExpandThreadCollectionViewCell: UICollectionViewListCell {
     
     private var avatarContainerView: UIView!
     private var avatarContainerWidthConstraint: NSLayoutConstraint!
@@ -46,8 +46,6 @@ class ExpandThreadCollectionViewCell: UICollectionViewCell {
         contentView.addSubview(hStack)
         stackViewLeadingConstraint = hStack.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 16)
         
-        // TODO: separator
-        
         threadLinkView = UIView()
         threadLinkView.backgroundColor = .tintColor.withAlphaComponent(0.5)
         threadLinkView.layer.cornerRadius = 2.5
@@ -142,4 +140,19 @@ class ExpandThreadCollectionViewCell: UICollectionViewCell {
         }
     }
     
+    override func updateConfiguration(using state: UICellConfigurationState) {
+        var config = UIBackgroundConfiguration.listPlainCell()
+        if state.isSelected || state.isHighlighted {
+            var hue: CGFloat = 0
+            var saturation: CGFloat = 0
+            var brightness: CGFloat = 0
+            UIColor.secondarySystemBackground.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: nil)
+            let sign: CGFloat = traitCollection.userInterfaceStyle == .dark ? 1 : -1
+            config.backgroundColor = UIColor(hue: hue, saturation: saturation, brightness: max(0, brightness + sign * 0.1), alpha: 1)
+        } else {
+            config.backgroundColor = .secondarySystemBackground
+        }
+        backgroundConfiguration = config.updated(for: state)
+    }
+    
 }