Trying to move an InputField object around when held and dragged around

Hello,

I have a script that's supposed to detect when the mouse is being held down (TextbeingHeld) and pan around an inputField text box. The script finds the current position of the mouse pointer, then updates the position of the inputField that has an EventTrigger. However, the code doesn't seem to work properly.

The commented code is another method I tried using to find the x and y positions of the pointer but I am getting a null reference when I'm in game when TextbeingHeld becomes true.

Any help would be greatly appreciated.

Code (CSharp):

1. public class textBoxPointer : MonoBehaviour
2.     {
3.         private float speed = 10000.0f;
4.         private Vector2 target;
5.         private Vector2 position;
6.         private Camera cam;
7.         private bool TextbeingHeld = false;
8.  
9.         void Start()
10.         {
11.             target = new Vector2(554f, 297f);
12.             position = gameObject.transform.position;
13.  
14.             cam = Camera.main;
15.         }
16.  
17.         void Update()
18.         {
19.             Debug.Log(TextbeingHeld);
20.             float step = speed * Time.deltaTime;
21.             // move sprite towards the target location
22.             transform.position = Vector2.MoveTowards(transform.position, target, step);
23.             if (TextbeingHeld)
24.             {
25.                 MoveText();
26.             }
27.         }
28.  
29.         public void holdDown()
30.         {
31.             TextbeingHeld = true;
32.         }
33.  
34.         public void holdUp()
35.         {
36.  
37.             TextbeingHeld = false;
38.  
39.         }
40.  
41.         public void MoveText()
42.         {
43.             Event currentEvent = Event.current;
44.             //Vector2 mousePos = new Vector2();
45.             Vector2 point = new Vector2();
46.  
47.             // compute where the mouse is in world space
48.  
49.             var mousePos = Input.mousePosition;
50.             //mousePos.x = currentEvent.mousePosition.x;
51.             //mousePos.y = currentEvent.mousePosition.y;
52.             float x = Input.mousePosition.x;
53.             float y = Input.mousePosition.y;
54.             point = cam.ScreenToWorldPoint(new Vector3(x, y, 0.0f));
55.  
56.                 target = point;
57.            
58.         }
59.     }

 

Please be a little more specific than this.

- which script
- which line
- why you think it should NOT be a null ref

And if there is more than one thing dereferenced on the line, rewrite it into multiple lines so you actually know which variable is null.

 

Looking through your code there isn't a lot of dereferencing, but I did find something stating that

Event.current

will be null except within the

OnGUI()

function in a Monobehavior, and by that they mean only when Unity is calling your OnGUI() function.

https://stackoverflow.com/questions...nt-is-null-reference-only-s-current-available

 

I changed my code to the following but I am still not able to move around the InputText field. It should theoretically move I don't see the errors. I fixed the null references.

Code (CSharp):

1. public class textBoxPointer : EventTrigger
2.     {
3.         private float speed = 10000.0f;
4.         private Vector2 target;
5.         private Vector2 position;
6.         private Camera cam;
7.         private bool TextbeingHeld = false;
8.  
9.         void Start()
10.         {
11.             target = new Vector2(554f, 297f);
12.             position = gameObject.transform.position;
13.  
14.             cam = Camera.main;
15.         }
16.  
17.         void Update()
18.         {
19.             float step = speed * Time.deltaTime;
20.             transform.position = Vector2.MoveTowards(transform.position, target, step);
21.         }
22.  
23.         public void holdDown()
24.         {
25.             TextbeingHeld = true;
26.         }
27.  
28.         public void holdUp()
29.         {
30.  
31.             TextbeingHeld = false;
32.  
33.         }
34.  
35.         void OnGUI()
36.         {
37.             Event currentEvent = Event.current;
38.             Vector2 mousePos = new Vector2();
39.             Vector2 point = new Vector2();
40.  
41.             // compute where the mouse is in world space
42.             mousePos.x = currentEvent.mousePosition.x;
43.             mousePos.y = cam.pixelHeight - currentEvent.mousePosition.y;
44.             point = cam.ScreenToWorldPoint(new Vector3(mousePos.x, mousePos.y, 0.0f));
45.  
46.             if (TextbeingHeld)
47.             {
48.                 Debug.Log(TextbeingHeld);
49.                 target = point;
50.             }
51.            
52.         }
53.     }