164 lines
4.4 KiB
C#
164 lines
4.4 KiB
C#
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Events;
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using UnityEngine.UI;
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public class KeyboardScrollView : MonoBehaviour
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{
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[Header("Scroll View 组件")]
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public ScrollRect scrollRect;
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public RectTransform content;
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[Header("Item 列表")]
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private List<GameObject> items = new List<GameObject>();
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private int currentIndex = 0;
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public UnityEvent<string> enterEvent;
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void Start()
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{
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// 自动收集 Content 下的所有直接子物体作为 item
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items.Clear();
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foreach (Transform child in content)
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{
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items.Add(child.gameObject);
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}
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// 禁止鼠标滚轮
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scrollRect.scrollSensitivity = 0;
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// 禁止鼠标拖动
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CanvasGroup cg = scrollRect.GetComponent<CanvasGroup>();
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if (cg == null) cg = scrollRect.gameObject.AddComponent<CanvasGroup>();
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cg.interactable = false;
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// 初始化：关闭所有 select，打开第一个
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foreach (GameObject item in items)
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{
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Transform select = item.transform.GetChild(0);
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if (select != null)
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select.gameObject.SetActive(false);
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}
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currentIndex = 0;
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currectSelect = items[0];
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UpdateSelection();
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}
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void Update()
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{
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if (Input.GetKeyDown(KeyCode.DownArrow))
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{
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MoveNext();
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}
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else if (Input.GetKeyDown(KeyCode.UpArrow))
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{
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MovePrevious();
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}
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if (Input.GetKeyDown(KeyCode.Return))
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{
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if (currectSelect.name.Split('-').Length == 1)
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return;
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enterEvent?.Invoke(currectSelect.name.Split('-')[1]); //有些按钮会通向同一个页面
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}
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}
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void MoveNext()
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{
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if (currentIndex < items.Count - 1)
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{
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currentIndex++;
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UpdateSelection();
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ScrollIfNeeded();
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currectSelect = items[currentIndex];
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}
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}
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void MovePrevious()
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{
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if (currentIndex > 0)
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{
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currentIndex--;
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UpdateSelection();
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ScrollIfNeeded();
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currectSelect = items[currentIndex];
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}
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}
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private GameObject currectSelect;
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void UpdateSelection()
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{
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for (int i = 0; i < items.Count; i++)
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{
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Transform select = items[i].transform.GetChild(0);
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if (select != null)
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{
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select.gameObject.SetActive(i == currentIndex);
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}
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}
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}
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void ScrollIfNeeded()
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{
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// 强制刷新布局
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LayoutRebuilder.ForceRebuildLayoutImmediate(content);
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RectTransform selectedItem = items[currentIndex].GetComponent<RectTransform>();
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// 将 item 的四个角转换到 viewport 坐标系
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Vector3[] itemWorldCorners = new Vector3[4];
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selectedItem.GetWorldCorners(itemWorldCorners);
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Vector3[] viewportWorldCorners = new Vector3[4];
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scrollRect.viewport.GetWorldCorners(viewportWorldCorners);
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float itemTop = itemWorldCorners[1].y; // 左上角 y
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float itemBottom = itemWorldCorners[0].y; // 左下角 y
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float viewportTop = viewportWorldCorners[1].y;
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float viewportBottom = viewportWorldCorners[0].y;
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float delta = 0f;
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// item 顶部高于 viewport 顶部，向下滚动
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if (itemTop > viewportTop)
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{
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delta = itemTop - viewportTop;
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content.anchoredPosition -= new Vector2(0, delta);
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}
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// item 底部低于 viewport 底部，向上滚动
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else if (itemBottom < viewportBottom)
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{
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delta = viewportBottom - itemBottom;
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content.anchoredPosition += new Vector2(0, delta);
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}
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// 限制滚动范围
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float maxY = Mathf.Max(0, content.rect.height - scrollRect.viewport.rect.height);
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float y = Mathf.Clamp(content.anchoredPosition.y, 0, maxY);
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content.anchoredPosition = new Vector2(content.anchoredPosition.x, y);
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}
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// 获取当前可视区域的第一个 item 索引
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int GetFirstVisibleIndex()
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{
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float scrollTop = content.anchoredPosition.y;
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for (int i = 0; i < items.Count; i++)
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{
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RectTransform item = items[i].GetComponent<RectTransform>();
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float itemTop = Mathf.Abs(item.anchoredPosition.y);
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float itemBottom = itemTop + item.rect.height;
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if (itemBottom > scrollTop)
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{
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return i;
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}
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}
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return 0;
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}
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}
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