124 lines
4.1 KiB
C#
124 lines
4.1 KiB
C#
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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using Logic.CrashSight;
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namespace UI.Common
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{
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[RequireComponent(typeof(ScrollRect))]
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public class ChooseUISnapScrollRect : MonoBehaviour, IEndDragHandler
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{
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public RectTransform content; // 自动寻找 Viewport/List
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public float snapSpeed = 10f; // 平滑速度
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public float snapThreshold = 0.1f; // 靠近这个范围就停止
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public float itemHeight = 60f; // 每项高度（固定）
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private ScrollRect scrollRect;
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private bool isSnapping = false;
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private int itemCount = 0;
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public int selectedIndex = -1;
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void Start()
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{
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scrollRect = GetComponent<ScrollRect>();
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scrollRect.horizontal = false;
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scrollRect.vertical = true;
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// 自动寻找 Viewport/List
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if (content == null)
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{
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Transform viewport = transform.Find("Viewport");
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if (viewport != null)
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{
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Transform list = viewport.Find("List");
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if (list != null)
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{
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content = list.GetComponent<RectTransform>();
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scrollRect.content = content;
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}
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else
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{
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LogSystem.LogError($"{name}: 找不到 Viewport/List！");
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}
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}
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else
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{
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LogSystem.LogError($"{name}: 找不到 Viewport！");
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}
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}
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if (content != null)
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{
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itemCount = content.childCount;
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}
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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if (!isSnapping && content != null)
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{
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StartCoroutine(SnapToClosestItem());
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}
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}
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IEnumerator SnapToClosestItem()
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{
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isSnapping = true;
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float currentY = content.anchoredPosition.y;
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int closestIndex = Mathf.RoundToInt(currentY / itemHeight);
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closestIndex = Mathf.Clamp(closestIndex, 0, itemCount - 1);
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selectedIndex = closestIndex;
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float targetY = closestIndex * itemHeight;
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while (Mathf.Abs(content.anchoredPosition.y - targetY) > snapThreshold)
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{
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float newY = Mathf.Lerp(content.anchoredPosition.y, targetY, Time.deltaTime * snapSpeed);
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content.anchoredPosition = new Vector2(content.anchoredPosition.x, newY);
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yield return null;
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}
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content.anchoredPosition = new Vector2(content.anchoredPosition.x, targetY);
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HighlightSelectedItem(closestIndex);
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isSnapping = false;
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}
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private void HighlightSelectedItem(int selected)
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{
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for (int i = 0; i < itemCount; i++)
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{
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var option = content.GetChild(i);
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var tmp = option.GetComponent<TMPro.TextMeshProUGUI>();
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if (tmp != null)
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{
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tmp.color = (i == selected)
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? new Color32(0xFF, 0xFF, 0xFF, 255) // #FFFFFF
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: new Color32(0x78, 0x78, 0x78, 255); // #787878
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continue;
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}
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var uiText = option.GetComponent<Text>();
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if (uiText != null)
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{
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uiText.color = (i == selected)
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? new Color32(0xFF, 0xFF, 0xFF, 255)
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: new Color32(0x78, 0x78, 0x78, 255);
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}
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}
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}
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// 可手动吸附到某一项
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public void SnapToIndex(int index)
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{
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index = Mathf.Clamp(index, 0, itemCount - 1);
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float targetY = index * itemHeight;
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content.anchoredPosition = new Vector2(content.anchoredPosition.x, targetY);
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selectedIndex = index;
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HighlightSelectedItem(index);
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}
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}
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}
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