segregate files

pedi-foods/Sources/PediFoods/Views/Main/HomeScrollOffsetObserver.swift

@@ -0,0 +1,76 @@
+import SwiftUI
+#if canImport(UIKit)
+import UIKit
+#endif
+
+#if os(iOS)
+@MainActor
+struct ScrollOffsetObserver: UIViewRepresentable {
+    let onOffsetChange: (CGFloat) -> Void
+
+    func makeUIView(context: Context) -> ScrollOffsetProbeView {
+        let view = ScrollOffsetProbeView()
+        view.onOffsetChange = onOffsetChange
+        return view
+    }
+
+    func updateUIView(_ uiView: ScrollOffsetProbeView, context: Context) {
+        uiView.onOffsetChange = onOffsetChange
+        uiView.attachIfNeeded()
+    }
+}
+
+@MainActor
+final class ScrollOffsetProbeView: UIView {
+    var onOffsetChange: (CGFloat) -> Void = { _ in }
+
+    private weak var observedScrollView: UIScrollView?
+    private var observation: NSKeyValueObservation?
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        backgroundColor = .clear
+        isUserInteractionEnabled = false
+    }
+
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+
+    deinit {
+        observation?.invalidate()
+    }
+
+    override func didMoveToSuperview() {
+        super.didMoveToSuperview()
+        attachIfNeeded()
+    }
+
+    override func didMoveToWindow() {
+        super.didMoveToWindow()
+        attachIfNeeded()
+    }
+
+    func attachIfNeeded() {
+        guard let scrollView = findEnclosingScrollView() else { return }
+        guard scrollView !== observedScrollView else { return }
+
+        observation?.invalidate()
+        observedScrollView = scrollView
+        observation = scrollView.observe(\.contentOffset, options: [.initial, .new]) { [weak self] sv, _ in
+            self?.onOffsetChange(sv.contentOffset.y)
+        }
+    }
+
+    private func findEnclosingScrollView() -> UIScrollView? {
+        var view: UIView? = self
+        while let current = view {
+            if let scrollView = current as? UIScrollView {
+                return scrollView
+            }
+            view = current.superview
+        }
+        return nil
+    }
+}
+#endif