UI Dragging

Krythic

Jan 15th, 2024

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using UnityEngine;
using UnityEngine.EventSystems;
public class DraggableControl : MonoBehaviour,
IPointerDownHandler, IPointerUpHandler, IDragHandler
{
public GameObject parent;
public Canvas canvas;
private bool _isDragging;
private Vector3 _offset;
// Start is called before the first frame update
void Start()
{
}
public void OnPointerDown(PointerEventData eventData)
{
_isDragging = true;
_offset = eventData.position - new Vector2(parent.transform.position.x, parent.transform.position.y);
}
public void OnPointerUp(PointerEventData eventData)
{
_isDragging = false;
}
public void OnDrag(PointerEventData eventData)
{
if (_isDragging)
{
Vector3 position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0f) - _offset;
parent.transform.position = position;
/**
* TODO Tomorrow
* Move the two getcomponent calls up to the OnPointerDown handler, so we only call it once while
* the playeris dragging the ui element, instead of every frame that it is dragging.
*/
ClampToWindow(
position,
parent.GetComponent<RectTransform>(),
canvas.GetComponent<RectTransform>());
}
}
private void ClampToWindow(Vector3 mousePosition, RectTransform parentRect, RectTransform canvasRect)
{
parentRect.transform.position = mousePosition;
Vector3 pos = parentRect.localPosition;
Vector3 minPosition = canvasRect.rect.min - parentRect.rect.min;
Vector3 maxPosition = canvasRect.rect.max - parentRect.rect.max;
pos.x = Mathf.Clamp(parentRect.localPosition.x, minPosition.x, maxPosition.x);
pos.y = Mathf.Clamp(parentRect.localPosition.y, minPosition.y, maxPosition.y);
parentRect.localPosition = pos;
}
}

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