Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.
CloseFor some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.
Close| eventData | Current event data. |
Called by the EventSystem every time the pointer is moved during dragging.
See EventTrigger for example usage.
//Attach this script to the GameObject you would like to detect dragging on //Attach an Event Trigger component to the GameObject (Click the Add Component button and go to Event>Event Trigger) //Make sure the Camera you are using has a Physics Raycaster (Click the Add Component button and go to Event>Physics Raycaster) so it can detect clicks on GameObjects.
using UnityEngine; using UnityEngine.EventSystems;
public class OnDragExample : MonoBehaviour { void Start() { EventTrigger trigger = GetComponent<EventTrigger>(); EventTrigger.Entry entry = new EventTrigger.Entry(); entry.eventID = EventTriggerType.Drag; entry.callback.AddListener((data) => { OnDragDelegate((PointerEventData)data); }); trigger.triggers.Add(entry); }
public void OnDragDelegate(PointerEventData data) { Debug.Log("Dragging."); } }
The next example allows you to move a GameObject by dragging.
using UnityEngine; using UnityEngine.EventSystems;
public class OnDragExample : MonoBehaviour { void Start() { //Fetch the Event Trigger component from your GameObject EventTrigger trigger = GetComponent<EventTrigger>(); //Create a new entry for the Event Trigger EventTrigger.Entry entry = new EventTrigger.Entry(); //Add a Drag type event to the Event Trigger entry.eventID = EventTriggerType.Drag; //call the OnDragDelegate function when the Event System detects dragging entry.callback.AddListener((data) => { OnDragDelegate((PointerEventData)data); }); //Add the trigger entry trigger.triggers.Add(entry); }
public void OnDragDelegate(PointerEventData data) { //Create a ray going from the camera through the mouse position Ray ray = Camera.main.ScreenPointToRay(data.position); //Calculate the distance between the Camera and the GameObject, and go this distance along the ray Vector3 rayPoint = ray.GetPoint(Vector3.Distance(transform.position, Camera.main.transform.position)); //Move the GameObject when you drag it transform.position = rayPoint; } }
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thanks for helping to make the Unity documentation better!