moving list view

lib/models/activity_timer_model.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:scrollable_positioned_list/scrollable_positioned_list.dart';
 import 'package:sendtrain/models/activity_model.dart';
 
 class ActivityTimerModel with ChangeNotifier {
@@ -11,6 +12,7 @@ class ActivityTimerModel with ChangeNotifier {
   int _currentSetNum = 0;
   Timer? _periodicTimer;
   double _progress = 0;
+  ItemScrollController? _isc;
 
   int get actionCount => _actionCounter;
   int get currentActionNum => _currentActionNum;
@@ -24,11 +26,31 @@ class ActivityTimerModel with ChangeNotifier {
   double get progress => _progress;
 
   void setup(ActivityModel activity) {
-    _activity = activity;
-    _sets = activity.actions[0].items();
+    if (_activity == null || activity.id != _activity?.id) {
+      _periodicTimer?.cancel();
+      _progress = 0;
+      _isc = null;
+      _activity = activity;
+      _sets = activity.actions[0].items();
+      _currentActionNum = 0;
+      _currentSetNum = 0;
+      setActionCount();
+    }
+
+    moveToIndex(_currentSetNum);
+  }
+
+  void reset() {
+    _progress = 0;
     _currentActionNum = 0;
     _currentSetNum = 0;
+    _periodicTimer!.cancel();
     setActionCount();
+    moveToIndex(0);
+  }
+
+  void setScrollController(ItemScrollController isc) {
+    _isc = isc;
   }
 
   bool isCurrentItem(int setNum, int actionNum) {
@@ -79,13 +101,16 @@ class ActivityTimerModel with ChangeNotifier {
   }
 
   void updateProgress() {
-    _progress = (currentAction['actionID'] + (1.0 - _actionCounter / currentAction['amount'])) / totalActions();
+    _progress = (currentAction['actionID'] +
+            (1.0 - _actionCounter / currentAction['amount'])) /
+        totalActions();
     notifyListeners();
   }
 
   void setAction(int setNum, int actionNum, String type) {
     _currentActionNum = actionNum;
     _currentSetNum = setNum;
+    moveToIndex(_currentSetNum);
     notifyListeners();
   }
 
@@ -99,8 +124,16 @@ class ActivityTimerModel with ChangeNotifier {
     } else {
       // if we're done all the sets
       // cancel timer and reset activity
-      _periodicTimer!.cancel();
-      setup(_activity!);
+      reset();
+    }
+  }
+
+  void moveToIndex(int index) {
+    if (_isc != null && _isc!.isAttached) {
+      _isc?.scrollTo(
+          index: index,
+          duration: Duration(milliseconds: 500),
+          curve: Curves.easeInOutCubic);
     }
   }