From 304416afdb639ed32959f42d4371a9d3ebc4a917 Mon Sep 17 00:00:00 2001
From: Matt Bruce <matt.bruce@verizon.com>
Date: Sat, 26 Aug 2023 10:45:15 -0500
Subject: [PATCH] update label for accessibility elements

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>
---
 VDS/Components/Label/Label.swift | 76 +++++++++++++++++++++++++++-----
 1 file changed, 66 insertions(+), 10 deletions(-)

diff --git a/VDS/Components/Label/Label.swift b/VDS/Components/Label/Label.swift
index 45777f5b..dc69bfea 100644
--- a/VDS/Components/Label/Label.swift
+++ b/VDS/Components/Label/Label.swift
@@ -95,7 +95,7 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
                 .sink { [weak self] notification in
                     self?.setNeedsUpdate()
                 }.store(in: &subscribers)
-
+            
             backgroundColor = .clear
             numberOfLines = 0
             lineBreakMode = .byWordWrapping
@@ -106,7 +106,7 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
             setNeedsUpdate()
        }
     }
-    
+   
     open func setup() {}
     
     /// Resets to default settings.
@@ -156,6 +156,9 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
                                 
                 //force a drawText
                 setNeedsDisplay()
+                
+                setNeedsLayout()
+                layoutIfNeeded()
             }
         }
     }
@@ -174,7 +177,25 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
                 
                 //add attribute on the string
                 attribute.setAttribute(on: mutableAttributedString)
+            }
+        }
+    }
 
+    open override func layoutSubviews() {
+        super.layoutSubviews()
+        applyActions()
+    }
+    
+    private func applyActions() {
+        actions = []
+        guard let attributedText else { return }
+        
+        let mutableAttributedString = NSMutableAttributedString(attributedString: attributedText)
+        
+        if let attributes = attributes {
+            //loop through the models attributes
+            for attribute in attributes {
+                
                 //see if the attribute is Actionable
                 if let actionable = attribute as? any ActionLabelAttributeModel{
                     //create a accessibleAction
@@ -184,9 +205,20 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
                     actions.append(LabelAction(range: actionable.range, action: actionable.action, accessibilityID: customAccessibilityAction?.hashValue ?? -1))
                 }
             }
+            
+            if let accessibilityElements, !accessibilityElements.isEmpty {
+                let staticText = UIAccessibilityElement(accessibilityContainer: self)
+                staticText.accessibilityLabel = text
+                staticText.accessibilityTraits = .staticText
+                staticText.accessibilityFrameInContainerSpace = bounds
+                
+                isAccessibilityElement = false
+                self.accessibilityElements = accessibilityElements.compactMap{$0 as? UIAccessibilityElement}.filter { $0.accessibilityLabel != text }
+                self.accessibilityElements?.insert(staticText, at: 0)
+            }
         }
     }
-        
+
     //--------------------------------------------------
     // MARK: - Actionable
     //--------------------------------------------------
@@ -218,10 +250,10 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
 
     private var actions: [LabelAction] = [] {
         didSet {
-            isUserInteractionEnabled = !actions.isEmpty
-            accessibilityTraits = !actions.isEmpty ? .link : .staticText
             if actions.isEmpty {
                 tapGesture = nil
+                isUserInteractionEnabled = true
+                accessibilityTraits = .staticText
             } else {
                 //add tap gesture
                 if tapGesture == nil {
@@ -253,18 +285,42 @@ open class Label: UILabel, ViewProtocol, UserInfoable {
     //--------------------------------------------------
     private func customAccessibilityAction(text: String?, range: NSRange, accessibleText: String? = nil) -> UIAccessibilityCustomAction? {
         
-        guard let text = text else { return nil }
-        //TODO: accessibilityHint for Label
-//        if accessibilityHint == nil {
-//            accessibilityHint = MVMCoreUIUtility.hardcodedString(withKey: "swipe_to_select_with_action_hint")
-//        }
+        guard let text = text, let attributedText else { return nil }
         
         let actionText = accessibleText ?? NSString(string:text).substring(with: range)
+               
+        // Calculate the frame of the substring
+        let layoutManager = NSLayoutManager()
+        let textContainer = NSTextContainer(size: bounds.size)
+        let textStorage = NSTextStorage(attributedString: attributedText)
+        layoutManager.addTextContainer(textContainer)
+        textStorage.addLayoutManager(layoutManager)
+
+        var glyphRange = NSRange()
+       
+        // Convert the range for the substring into a range of glyphs
+        layoutManager.characterRange(forGlyphRange: range, actualGlyphRange: &glyphRange)
+       
+        let substringBounds = layoutManager.boundingRect(forGlyphRange: glyphRange, in: textContainer)
+
+        // Create custom accessibility element
+        let element = UIAccessibilityElement(accessibilityContainer: self)
+        element.accessibilityLabel = actionText
+        element.accessibilityTraits = .link
+        element.accessibilityFrameInContainerSpace = substringBounds
+        //TODO: accessibilityHint for Label
+//      element.accessibilityHint = MVMCoreUIUtility.hardcodedString(withKey: "swipe_to_select_with_action_hint")
+
+        accessibilityElements = (accessibilityElements ?? []).compactMap{$0 as? UIAccessibilityElement}.filter { $0.accessibilityLabel != actionText }
+        accessibilityElements?.append(element)
+
         let accessibleAction = UIAccessibilityCustomAction(name: actionText, target: self, selector: #selector(accessibilityCustomAction(_:)))
         accessibilityCustomActions?.append(accessibleAction)
         return accessibleAction
     }
     
+
+    
     @objc public func accessibilityCustomAction(_ action: UIAccessibilityCustomAction) {
         
         for actionable in actions {