Update project

lib/features/Store/presentation/controller/store_controller.dart

@@ -0,0 +1,120 @@
+import 'dart:async';
+
+import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+/// Manages all scroll, cart-bar visibility, back-to-top, and
+/// network-retry logic for StoreViewPage.
+class StoreViewController extends GetxController {
+  // ── Scroll ──────────────────────────────────────────────
+  final ScrollController scrollController = ScrollController();
+
+  double scrollOffset = 0.0;
+  bool showBackToTop = false;
+  bool hideCartBar = false;
+
+  Timer? _cartTimer;
+
+  // ── Mini-cart ────────────────────────────────────────────
+  RxBool showMiniCart = false.obs;
+
+  // ── Search ───────────────────────────────────────────────
+  final TextEditingController searchController = TextEditingController();
+
+  // ── Misc ─────────────────────────────────────────────────
+  var selectedCategoryId = 0.obs;
+
+  @override
+  void onInit() {
+    super.onInit();
+    scrollController.addListener(_onScroll);
+  }
+
+  @override
+  void onClose() {
+    scrollController.removeListener(_onScroll);
+    scrollController.dispose();
+    searchController.dispose();
+    _cartTimer?.cancel();
+    super.onClose();
+  }
+
+  // ── Scroll handler (used by the ScrollController listener) ──
+  void _onScroll() {
+    scrollOffset = scrollController.offset;
+    showBackToTop = scrollController.offset > 300;
+    update(['scroll']);
+  }
+
+  // ── Notification-based handler (NestedScrollView body) ──────
+  bool handleScrollNotification(ScrollNotification notification) {
+    if (notification is ScrollUpdateNotification &&
+        notification.metrics.axis == Axis.vertical) {
+      final double pixels = notification.metrics.pixels;
+      final bool isScrollingUp = pixels < scrollOffset;
+
+      scrollOffset = pixels;
+
+      if (isScrollingUp && pixels > 300) {
+        showBackToTop = true;
+      } else if (pixels <= 300 || !isScrollingUp) {
+        showBackToTop = false;
+      }
+
+      // Hide cart bar immediately on scroll
+      if (!hideCartBar) {
+        hideCartBar = true;
+        showMiniCart.value = false;
+        update(['cartBar']);
+      }
+
+      // Re-show cart bar after scroll stops
+      _cartTimer?.cancel();
+      _cartTimer = Timer(const Duration(milliseconds: 250), () {
+        if (hideCartBar) {
+          hideCartBar = false;
+          update(['cartBar']);
+        }
+      });
+
+      update(['scroll']);
+    }
+    return false;
+  }
+
+  // ── Background colour based on scroll position ───────────────
+  Color backgroundColorFor(List<Color> colors) {
+    if (colors.isEmpty) return Colors.white;
+    return colors[(scrollOffset ~/ 300) % colors.length];
+  }
+
+  // ── Scroll to top ─────────────────────────────────────────────
+  void scrollToTop() {
+    scrollController.animateTo(
+      0,
+      duration: const Duration(milliseconds: 400),
+      curve: Curves.easeOut,
+    );
+  }
+
+  // ── Network retry ─────────────────────────────────────────────
+  Future<void> retryNetworkCall(Future<void> Function() onSuccess) async {
+    final connectivityResult = await Connectivity().checkConnectivity();
+
+    if (connectivityResult == ConnectivityResult.mobile ||
+        connectivityResult == ConnectivityResult.wifi) {
+      debugPrint('✅ Internet available, retrying...');
+      await onSuccess();
+    } else {
+      debugPrint('❌ Still no internet connection');
+      Get.snackbar(
+        'No Internet',
+        'Please check your connection and try again.',
+        backgroundColor: Colors.grey[200],
+        colorText: Colors.black,
+        snackPosition: SnackPosition.TOP,
+      );
+    }
+  }
+}