64 lines
2.3 KiB
C#
64 lines
2.3 KiB
C#
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/// Credit .entity
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/// Sourced from - http://forum.unity3d.com/threads/rescale-panel.309226/
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using UnityEngine.EventSystems;
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namespace UnityEngine.UI.Extensions
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{
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[AddComponentMenu("UI/Extensions/RescalePanels/RescaleDragPanel")]
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public class RescaleDragPanel : MonoBehaviour, IPointerDownHandler, IDragHandler
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{
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private Vector2 pointerOffset;
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private RectTransform canvasRectTransform;
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private RectTransform panelRectTransform;
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private Transform goTransform;
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void Awake()
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{
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Canvas canvas = GetComponentInParent<Canvas>();
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if (canvas != null)
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{
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canvasRectTransform = canvas.transform as RectTransform;
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panelRectTransform = transform.parent as RectTransform;
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goTransform = transform.parent;
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}
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}
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public void OnPointerDown(PointerEventData data)
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{
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panelRectTransform.SetAsLastSibling();
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RectTransformUtility.ScreenPointToLocalPointInRectangle(panelRectTransform, data.position, data.pressEventCamera, out pointerOffset);
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}
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public void OnDrag(PointerEventData data)
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{
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if (panelRectTransform == null)
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return;
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Vector2 pointerPosition = ClampToWindow(data);
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Vector2 localPointerPosition;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
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canvasRectTransform, pointerPosition, data.pressEventCamera, out localPointerPosition
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))
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{
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panelRectTransform.localPosition = localPointerPosition - new Vector2(pointerOffset.x * goTransform.localScale.x, pointerOffset.y * goTransform.localScale.y);
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}
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}
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Vector2 ClampToWindow(PointerEventData data)
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{
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Vector2 rawPointerPosition = data.position;
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Vector3[] canvasCorners = new Vector3[4];
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canvasRectTransform.GetWorldCorners(canvasCorners);
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float clampedX = Mathf.Clamp(rawPointerPosition.x, canvasCorners[0].x, canvasCorners[2].x);
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float clampedY = Mathf.Clamp(rawPointerPosition.y, canvasCorners[0].y, canvasCorners[2].y);
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Vector2 newPointerPosition = new Vector2(clampedX, clampedY);
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return newPointerPosition;
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}
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}
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}
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