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63 行
2.0 KiB
63 行
2.0 KiB
/* DropDownAutoScrollOnChange
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* --------------------------
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* Updates scrolling when selection changes inside a drop down panel when selection changes.
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* This scripts patches the inability of ScrollRects to handle correct scrolling upon selection change.
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*
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* Adepted From:
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* https://answers.unity.com/questions/1169028/unity-dropdown-doesnt-scroll-when-navigating-with.html
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*/
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using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.EventSystems;
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namespace GameOptionsUtility.Utility
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{
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[RequireComponent(typeof(ScrollRect))]
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internal class DropDownAutoScrollOnChange : MonoBehaviour
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{
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RectTransform scrollRectTransform;
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RectTransform contentPanel;
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RectTransform selectedRectTransform;
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GameObject lastSelected;
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void Start()
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{
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scrollRectTransform = GetComponent<RectTransform>();
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}
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void Update()
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{
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// Lazy Get
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if (contentPanel == null)
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contentPanel = GetComponent<ScrollRect>().content;
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GameObject selected = EventSystem.current.currentSelectedGameObject;
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if (selected == null)
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return;
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if (selected.transform.parent != contentPanel.transform)
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return;
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if (selected == lastSelected)
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return;
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selectedRectTransform = selected.GetComponent<RectTransform>();
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float yPos = -(selectedRectTransform.localPosition.y) - (selectedRectTransform.rect.height / 2);
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float yContent = contentPanel.anchoredPosition.y;
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float maxHeight = scrollRectTransform.rect.height - selectedRectTransform.rect.height;
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float delta = yPos - yContent;
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if (delta < 0)
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yContent = yPos;
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else if (delta > maxHeight)
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yContent = yPos - maxHeight;
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else
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return;
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contentPanel.anchoredPosition = new Vector2(contentPanel.anchoredPosition.x, yContent);
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lastSelected = selected;
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}
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}
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}
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