84 lines
2.6 KiB
C#
84 lines
2.6 KiB
C#
using UnityEngine;
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using UnityEngine.UI;
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using TMPro;
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[RequireComponent(typeof(RectTransform))]
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public class HintWindowController : MonoBehaviour
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{
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[SerializeField] private TextMeshProUGUI _text;
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[SerializeField] private Vector2 _padding = new Vector2(16, 10);
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[SerializeField] private Vector2 _anchorOffset = new Vector2(16, 16);
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private RectTransform _selfRt;
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private Canvas _rootCanvas;
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private Camera _uiCamera;
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private void Awake()
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{
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_selfRt = (RectTransform)transform;
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_rootCanvas = GetComponentInParent<Canvas>();
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_uiCamera = _rootCanvas.worldCamera;
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// 兜底找 Text
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if (_text == null)
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_text = GetComponentInChildren<TextMeshProUGUI>(true);
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if (_text == null)
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Debug.LogError("[HintWindowController] 找不到 TextMeshProUGUI！", this);
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}
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public void Present(Vector2 mouseScreenPos)
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{
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if (_text == null) return;
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RefreshSize();
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ClampToScreen(mouseScreenPos);
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}
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public void RefreshSize()
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{
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_text.ForceMeshUpdate(false, false);
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LayoutRebuilder.ForceRebuildLayoutImmediate(_text.rectTransform);
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float w = _text.preferredWidth + _padding.x * 2f;
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float h = _text.preferredHeight + _padding.y * 2f;
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_selfRt.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, w);
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_selfRt.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, h);
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Canvas.ForceUpdateCanvases();
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}
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private void ClampToScreen(Vector2 mouseScreenPos)
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{
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Rect screenRect = _rootCanvas.pixelRect;
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// 计算窗口左上角假想屏幕坐标
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Vector2 topLeft = mouseScreenPos + _anchorOffset;
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float windowW = _selfRt.rect.width;
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float windowH = _selfRt.rect.height;
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// 四边
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float left = topLeft.x;
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float right = left + windowW;
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float top = topLeft.y;
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float bottom = top - windowH; // 注意 Canvas 局部坐标 y 向下为正
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// 修正到屏幕内
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left = Mathf.Clamp(left, screenRect.xMin, screenRect.xMax - windowW);
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top = Mathf.Clamp(top, screenRect.yMin + windowH, screenRect.yMax);
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// 转回 Canvas 局部坐标
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RectTransform canvasRt = _rootCanvas.GetComponent<RectTransform>();
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RectTransformUtility.ScreenPointToLocalPointInRectangle(
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canvasRt,
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new Vector2(left, top),
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_uiCamera,
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out Vector2 localPos);
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_selfRt.localPosition = localPos;
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_selfRt.SetAsLastSibling();
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}
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}
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