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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.EventSystems;
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public class ResizePanel : MonoBehaviour, IPointerDownHandler, IDragHandler {
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public Vector2 minSize = new Vector2 (100, 100);
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public Vector2 maxSize = new Vector2 (400, 400);
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private RectTransform panelRectTransform;
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private Vector2 originalLocalPointerPosition;
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private Vector2 originalSizeDelta;
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void Awake () {
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panelRectTransform = transform.parent.GetComponent<RectTransform> ();
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}
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public void OnPointerDown (PointerEventData data) {
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originalSizeDelta = panelRectTransform.sizeDelta;
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RectTransformUtility.ScreenPointToLocalPointInRectangle (panelRectTransform, data.position, data.pressEventCamera, out originalLocalPointerPosition);
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}
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public void OnDrag (PointerEventData data) {
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if (panelRectTransform == null)
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return;
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Vector2 localPointerPosition;
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RectTransformUtility.ScreenPointToLocalPointInRectangle (panelRectTransform, data.position, data.pressEventCamera, out localPointerPosition);
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Vector3 offsetToOriginal = localPointerPosition - originalLocalPointerPosition;
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Vector2 sizeDelta = originalSizeDelta + new Vector2 (offsetToOriginal.x, -offsetToOriginal.y);
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sizeDelta = new Vector2 (
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Mathf.Clamp (sizeDelta.x, minSize.x, maxSize.x),
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Mathf.Clamp (sizeDelta.y, minSize.y, maxSize.y)
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);
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panelRectTransform.sizeDelta = sizeDelta;
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}
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}
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