using Cysharp.Threading.Tasks;
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using UnityEngine;
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using UnityEngine.UI;
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//控制目标的最大最小尺寸
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[ExecuteAlways]
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public class LayoutElementSizeClamp : LayoutElement
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{
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[SerializeField] bool m_ClampEnable;
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public bool clampEnable { get { return m_ClampEnable; } set { m_ClampEnable = value; } }
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[SerializeField] Clamp m_Clamp;
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public Clamp clamp { get { return m_Clamp; } }
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[SerializeField] RectTransform m_Target;
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protected override void OnEnable()
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{
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base.OnEnable();
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if (clampEnable && m_Target != null)
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{
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UpdateRect().Forget();
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}
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}
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async UniTask UpdateRect()
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{
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await UniTask.DelayFrame(1);
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preferredHeight = -1;
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preferredWidth = -1;
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//频繁调用ForceRebuildLayoutImmediate的原因是
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// 如Text要自适应宽高又要限制宽高, 先要处理宽度刷新后才能计算换行
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// 强制重新计算布局
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LayoutRebuilder.ForceRebuildLayoutImmediate(transform.parent as RectTransform);
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preferredWidth = Mathf.Clamp(m_Target.rect.width, m_Clamp.minX, m_Clamp.maxX);
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// 强制重新计算布局
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LayoutRebuilder.ForceRebuildLayoutImmediate(transform.parent as RectTransform);
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preferredHeight = Mathf.Clamp(m_Target.rect.height, m_Clamp.minY, m_Clamp.maxY);
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}
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[System.Serializable]
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public struct Clamp
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{
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public float minX;
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public float maxX;
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public float minY;
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public float maxY;
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}
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}
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