89 lines
2.6 KiB
C#
89 lines
2.6 KiB
C#
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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[RequireComponent(typeof(ScrollRect))]
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public class ScrollRectAutoScroll : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
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{
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public float scrollSpeed = 10f;
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private bool mouseOver = false;
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private List<Selectable> m_Selectables = new List<Selectable>();
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private ScrollRect m_ScrollRect;
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private Vector2 m_NextScrollPosition = Vector2.up;
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void OnEnable()
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{
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if (m_ScrollRect)
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{
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m_ScrollRect.content.GetComponentsInChildren(m_Selectables);
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}
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}
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void Awake()
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{
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m_ScrollRect = GetComponent<ScrollRect>();
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}
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void Start()
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{
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if (m_ScrollRect)
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{
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m_ScrollRect.content.GetComponentsInChildren(m_Selectables);
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}
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ScrollToSelected(true);
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}
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void Update()
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{
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// Scroll via input.
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InputScroll();
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if (!mouseOver)
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{
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// Lerp scrolling code.
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m_ScrollRect.normalizedPosition = Vector2.Lerp(m_ScrollRect.normalizedPosition, m_NextScrollPosition, scrollSpeed * Time.deltaTime);
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}
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else
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{
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m_NextScrollPosition = m_ScrollRect.normalizedPosition;
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}
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}
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void InputScroll()
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{
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if (m_Selectables.Count > 0)
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{
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if (Input.GetButtonDown("Horizontal") || Input.GetButtonDown("Vertical") || Input.GetButton("Horizontal") || Input.GetButton("Vertical"))
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{
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ScrollToSelected(false);
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}
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}
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}
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void ScrollToSelected(bool quickScroll)
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{
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int selectedIndex = -1;
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Selectable selectedElement = EventSystem.current.currentSelectedGameObject ? EventSystem.current.currentSelectedGameObject.GetComponent<Selectable>() : null;
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if (selectedElement)
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{
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selectedIndex = m_Selectables.IndexOf(selectedElement);
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}
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if (selectedIndex > -1)
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{
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if (quickScroll)
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{
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m_ScrollRect.normalizedPosition = new Vector2(0, 1 - (selectedIndex / ((float)m_Selectables.Count - 1)));
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m_NextScrollPosition = m_ScrollRect.normalizedPosition;
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}
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else
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{
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m_NextScrollPosition = new Vector2(0, 1 - (selectedIndex / ((float)m_Selectables.Count - 1)));
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}
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}
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}
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public void OnPointerEnter(PointerEventData eventData)
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{
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mouseOver = true;
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}
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public void OnPointerExit(PointerEventData eventData)
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{
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mouseOver = false;
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ScrollToSelected(false);
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}
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}
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