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49 lines
1.8 KiB
49 lines
1.8 KiB
using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.EventSystems;
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using System.Collections;
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public class DragPanel : MonoBehaviour, IPointerDownHandler, IDragHandler {
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private Vector2 originalLocalPointerPosition;
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private Vector3 originalPanelLocalPosition;
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private RectTransform panelRectTransform;
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private RectTransform parentRectTransform;
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void Awake () {
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panelRectTransform = transform.parent as RectTransform;
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parentRectTransform = panelRectTransform.parent as RectTransform;
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}
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public void OnPointerDown (PointerEventData data) {
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originalPanelLocalPosition = panelRectTransform.localPosition;
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RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, 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 || parentRectTransform == null)
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return;
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Vector2 localPointerPosition;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, data.position, data.pressEventCamera, out localPointerPosition)) {
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Vector3 offsetToOriginal = localPointerPosition - originalLocalPointerPosition;
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panelRectTransform.localPosition = originalPanelLocalPosition + offsetToOriginal;
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}
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ClampToWindow ();
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}
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// Clamp panel to area of parent
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void ClampToWindow () {
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Vector3 pos = panelRectTransform.localPosition;
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Vector3 minPosition = parentRectTransform.rect.min - panelRectTransform.rect.min;
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Vector3 maxPosition = parentRectTransform.rect.max - panelRectTransform.rect.max;
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pos.x = Mathf.Clamp (panelRectTransform.localPosition.x, minPosition.x, maxPosition.x);
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pos.y = Mathf.Clamp (panelRectTransform.localPosition.y, minPosition.y, maxPosition.y);
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panelRectTransform.localPosition = pos;
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}
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}
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