[WIP] Nested list implementation

TextKit2NumberedBulletList/ContentView.swift

@@ -11,13 +11,20 @@ struct ContentView: View {
     @StateObject var model = TextEditorModel()
     @State private var text = NSAttributedString()
     @State var showList = false
+    @State var nestItems = false
     var body: some View {
         VStack {
             CustomTextEditor(text: $text, model: model)
-            Button("Ordered list: \(model.isParagraphActive.description)") {
-                showList.toggle()
+            HStack {
+                Button("Ordered list: \(model.isParagraphActive.description)") {
+                    showList.toggle()
+                }
+                .buttonStyle(.bordered)
+                Button("Nested: \(model.isNestedParagraph.description)") {
+                    nestItems.toggle()
+                }
+                .buttonStyle(.bordered)
             }
-            .buttonStyle(.bordered)
         }
         .onChange(of: showList) {
             if model.isParagraphActive {
@@ -26,6 +33,13 @@ struct ContentView: View {
                 model.setNumberedParagraph()
             }
         }
+        .onChange(of: nestItems) {
+            if model.isNestedParagraph {
+                model.unnestParagraph()
+            } else {
+                model.nestParagraph()
+            }
+        }
         .padding()
     }
 }

TextKit2NumberedBulletList/CustomTextView.swift

@@ -34,6 +34,7 @@ extension TextEditorModel: UITextViewDelegate {
         // Check if there's any text selected
         guard selectedRange.length > 0 else {
             isParagraphActive = (textView.typingAttributes[.paragraphStyle] as? NSParagraphStyle)?.textLists.isNotEmpty ?? false
+            isNestedParagraph = (textView.typingAttributes[.paragraphStyle] as? NSParagraphStyle)?.textLists.last?.isOrdered == false
             return
         }
 
@@ -43,6 +44,7 @@ extension TextEditorModel: UITextViewDelegate {
 
         // Check if the attributes contain a paragraph style
         isParagraphActive = (attributes?[.paragraphStyle] as? NSParagraphStyle)?.textLists.isNotEmpty ?? false
+        isNestedParagraph = ((attributes?[.paragraphStyle] as? NSParagraphStyle)?.textLists.last?.isOrdered == false)
     }
 
     public func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {

TextKit2NumberedBulletList/TextEditor.swift

@@ -12,21 +12,34 @@ import SwiftUI
 public class TextEditorModel: NSObject, ObservableObject {
 
     @Published var isParagraphActive: Bool = false
+    @Published var isNestedParagraph: Bool = false
 
     weak var textView: CustomTextView?
     func setNumberedParagraph() {
         let list = NSTextList(markerFormat: .decimal, options: 0)
+
         let listParagraph = NSMutableParagraphStyle()
         listParagraph.paragraphSpacing = 0
         listParagraph.lineSpacing = 15
         listParagraph.textLists = [list]
         listParagraph.alignment = .left
 
+
         textView!.typingAttributes[.paragraphStyle] = listParagraph
 
         textView!.setAttributes([.paragraphStyle: listParagraph], forRange: textView!.selectedRange)
     }
 
+    func nestParagraph() {
+        let nestedList = NSTextList(markerFormat: .square, options: 0)
+        (textView?.typingAttributes[.paragraphStyle] as? NSMutableParagraphStyle)?.textLists.append(nestedList)
+    }
+
+    func unnestParagraph() {
+        let paragraph = textView?.typingAttributes[.paragraphStyle] as? NSMutableParagraphStyle
+        paragraph?.textLists.removeAll { !$0.isOrdered }
+    }
+
     func unsetNumberedParagraph() {
         textView?.typingAttributes[.paragraphStyle] = nil
         textView?.removeAttributes(in: textView!.selectedRange, forAttribute: .paragraphStyle)