RosettaMessageListController: callbacks, pagination, composer stub, selection stubs

Rosetta/Features/Chats/ChatDetail/ListView/RosettaMessageListController.swift

@@ -26,6 +26,32 @@ final class RosettaMessageListController: UIViewController {
 
     private let config: Config
 
+    // MARK: - Callbacks (mirrors NativeMessageListController API)
+
+    var onScrollToBottomVisibilityChange: ((Bool) -> Void)?
+    var onPaginationTrigger: (() -> Void)?
+    var onBottomPaginationTrigger: (() -> Void)?
+    var onJumpToBottom: (() -> Void)?
+    var onTapBackground: (() -> Void)?
+    var onComposerHeightChange: ((CGFloat) -> Void)?
+    var onKeyboardDidHide: (() -> Void)?
+    var onComposerSend: (() -> Void)?
+    var onComposerAttach: (() -> Void)?
+    var onComposerTextChange: ((String) -> Void)?
+    var onComposerFocusChange: ((Bool) -> Void)?
+    var onComposerReplyCancel: (() -> Void)?
+    var onComposerForwardCancel: (() -> Void)?
+    var onComposerTyping: (() -> Void)?
+
+    // MARK: - Public State
+
+    var hasMoreMessages: Bool = true
+    var hasNewerMessages: Bool = false
+
+    // MARK: - Composer
+
+    private(set) var composerView: ComposerView?
+
     // MARK: - Views
 
     private let listView = RosettaListView(frame: .zero)
@@ -56,6 +82,58 @@ final class RosettaMessageListController: UIViewController {
         listView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
         listView.stackFromBottom = true
         view.addSubview(listView)
+
+        // Wire listView callbacks
+        listView.onTapBackground = { [weak self] in
+            self?.onTapBackground?()
+        }
+        listView.displayedItemRangeChanged = { [weak self] range in
+            guard let self, let range else { return }
+            // Pagination: load more when near top
+            if range.lowerBound <= 5, self.hasMoreMessages {
+                self.onPaginationTrigger?()
+            }
+            // Reverse pagination: load newer when near bottom
+            if range.upperBound >= self.messages.count - 5, self.hasNewerMessages {
+                self.onBottomPaginationTrigger?()
+            }
+        }
+        listView.onScroll = { [weak self] _, _ in
+            // TODO: scroll-to-bottom button visibility
+        }
+    }
+
+    /// Setup composer view (called externally after init).
+    /// TODO: Full composer integration — currently NativeMessageListController handles this.
+    func setupComposer() {
+        // Composer setup is complex (voice recording, attachments, reply bar, etc.)
+        // Will be ported from NativeMessageListController in a later phase.
+    }
+
+    // MARK: - Selection Mode (stub)
+
+    func setSelectionMode(_ enabled: Bool, animated: Bool) {
+        // TODO: implement selection mode
+    }
+
+    func updateSelectedIds(_ ids: Set<String>) {
+        // TODO: implement selection
+    }
+
+    // MARK: - Highlight (stub)
+
+    func scrollToMessage(id: String, animated: Bool) {
+        listView.scrollToItem(id: id, animated: animated)
+    }
+
+    func animateHighlight(messageId: String?) {
+        // TODO: implement highlight
+    }
+
+    // MARK: - Empty State (stub)
+
+    func updateEmptyState(isEmpty: Bool, info: Any?) {
+        // TODO: implement empty state
     }
 
     // MARK: - Public API