Question SerializedField variables and public ones not showing in the inspector.

I was testing the script below found somewhere else, and the script works well. But I came into some trouble with serialization. The first 3 variables with SerializedField attribute attached to don't show up in the inspector, and I tried making them public but nothing changed. Did I missed something?
The screenshot shows how it looks after attached to a panel.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class PinchableScrollRect : ScrollRect
7. {
8.     [SerializeField] private float _minZoom = 1f;
9.     [SerializeField] float _maxZoom = 2f;
10.     [SerializeField] float _zoomLerpSpeed = 10f;
11.  
12.     float _currentZoom = 1;
13.     bool _isPinching = false;
14.     float _startPinchDist;
15.     float _startPinchZoom;
16.     Vector2 _startPinchCenterPosition;
17.     Vector2 _startPinchScreenPosition;
18.     float _mouseWheelSensitivity = 1;
19.     bool blockPan = false;
20.  
21.     protected override void Awake()
22.     {
23.         Input.multiTouchEnabled = true;
24.         Debug.Log(_minZoom);
25.         Debug.Log(_maxZoom);
26.         _minZoom = 1f;
27.         _maxZoom = 2f;
28.         Debug.Log(_minZoom);
29.         Debug.Log(_maxZoom);
30.     }
31.  
32.     private void Update()
33.     {
34.         if (Input.touchCount == 2)
35.         {
36.             if (!_isPinching)
37.             {
38.                 _isPinching = true;
39.                 OnPinchStart();
40.             }
41.             OnPinch();
42.         }
43.         else
44.         {
45.             _isPinching = false;
46.             if (Input.touchCount == 0)
47.             {
48.                 blockPan = false;
49.             }
50.         }
51.         //pc input
52.         float scrollWheelInput = Input.GetAxis("Mouse ScrollWheel");
53.         if (Mathf.Abs(scrollWheelInput) > float.Epsilon)
54.         {
55.             _currentZoom *= 1 + scrollWheelInput * _mouseWheelSensitivity;
56.             _currentZoom = Mathf.Clamp(_currentZoom, _minZoom, _maxZoom);
57.             _startPinchScreenPosition = (Vector2)Input.mousePosition;
58.             RectTransformUtility.ScreenPointToLocalPointInRectangle(content, _startPinchScreenPosition, null, out _startPinchCenterPosition);
59.             Vector2 pivotPosition = new Vector3(content.pivot.x * content.rect.size.x, content.pivot.y * content.rect.size.y);
60.             Vector2 posFromBottomLeft = pivotPosition + _startPinchCenterPosition;
61.             SetPivot(content, new Vector2(posFromBottomLeft.x / content.rect.width, posFromBottomLeft.y / content.rect.height));
62.         }
63.         //pc input end
64.  
65.         if (Mathf.Abs(content.localScale.x - _currentZoom) > 0.001f)
66.             content.localScale = Vector3.Lerp(content.localScale, Vector3.one * _currentZoom, _zoomLerpSpeed * Time.deltaTime);
67.  
68.         content.localScale = new Vector3(Mathf.Clamp(content.localScale.x, _minZoom, _maxZoom),
69.             Mathf.Clamp(content.localScale.x, _minZoom, _maxZoom),
70.             1f);
71.     }
72.  
73.     protected override void SetContentAnchoredPosition(Vector2 position)
74.     {
75.         if (_isPinching || blockPan) return;
76.         base.SetContentAnchoredPosition(position);
77.     }
78.  
79.     void OnPinchStart()
80.     {
81.         Vector2 pos1 = Input.touches[0].position;
82.         Vector2 pos2 = Input.touches[1].position;
83.  
84.         _startPinchDist = Distance(pos1, pos2) * content.localScale.x;
85.         _startPinchZoom = _currentZoom;
86.         _startPinchScreenPosition = (pos1 + pos2) / 2;
87.         RectTransformUtility.ScreenPointToLocalPointInRectangle(content, _startPinchScreenPosition, null, out _startPinchCenterPosition);
88.         //Debug.Log(_startPinchCenterPosition);
89.  
90.        
91.         Vector2 pivotPosition = new Vector3(content.pivot.x * content.rect.size.x, content.pivot.y * content.rect.size.y);
92.  
93.        
94.         Vector2 posFromBottomLeft = pivotPosition + _startPinchCenterPosition;
95.  
96.         SetPivot(content, new Vector2(posFromBottomLeft.x / content.rect.width, posFromBottomLeft.y / content.rect.height));
97.         blockPan = true;
98.     }
99.  
100.     void OnPinch()
101.     {
102.         float currentPinchDist = Distance(Input.touches[0].position, Input.touches[1].position) * content.localScale.x;
103.  
104.        
105.         _currentZoom = (currentPinchDist / _startPinchDist) * _startPinchZoom;
106.         _currentZoom = Mathf.Clamp(_currentZoom, _minZoom, _maxZoom);
107.         Debug.Log(_currentZoom);
108.     }
109.  
110.     float Distance(Vector2 pos1, Vector2 pos2)
111.     {
112.         RectTransformUtility.ScreenPointToLocalPointInRectangle(content, pos1, null, out pos1);
113.         RectTransformUtility.ScreenPointToLocalPointInRectangle(content, pos2, null, out pos2);
114.         return Vector2.Distance(pos1, pos2);
115.     }
116.  
117.     static void SetPivot(RectTransform rectTransform, Vector2 pivot)
118.     {
119.         if (rectTransform == null) return;
120.  
121.         Vector2 size = rectTransform.rect.size;
122.         Vector2 deltaPivot = rectTransform.pivot - pivot;
123.         Vector3 deltaPosition = new Vector3(deltaPivot.x * size.x, deltaPivot.y * size.y) * rectTransform.localScale.x;
124.         rectTransform.pivot = pivot;
125.  
126.        
127.         rectTransform.localPosition -= deltaPosition;
128.     }
129. }

 

ScrollRect no doubt has a custom inspector. So in order to add your fields you will probably need to do something special. This thread might help. It's an example for Transform, but you should be able to do something similar for ScrollRect: https://forum.unity.com/threads/extending-instead-of-replacing-built-in-inspectors.407612/

 

Thanks a lot. I'll take a look at it. It really seems helpful.