121 lines
3.5 KiB
C#
121 lines
3.5 KiB
C#
using UnityEngine;
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using UnityEngine.UI;
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using UnityEngine.Events;
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using System.Collections.Generic;
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using UnityEngine.EventSystems;
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/// <summary>
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/// 用于在Ui中切割Renderer的组件，类似RectMask2d；
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/// 暂时未处理Mask嵌套的情况
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/// </summary>
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[DisallowMultipleComponent]
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[RequireComponent(typeof(RectTransform))]
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public class UICameraMask : UIBehaviour, IClipper
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{
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private RectTransform rectTransform;
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private bool m_ShouldRecalculateClipRects;
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private List<UICameraMaskable> maskableList;
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private Vector4 clipArea;
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protected override void Awake()
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{
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base.Awake();
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rectTransform = (RectTransform)transform;
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maskableList = new List<UICameraMaskable>();
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}
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protected override void OnEnable()
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{
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base.OnEnable();
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m_ShouldRecalculateClipRects = true;
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ClipperRegistry.Register(this);
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}
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protected override void OnDisable()
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{
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base.OnDisable();
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maskableList.Clear();
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ClipperRegistry.Unregister(this);
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}
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// 暂时使用低端的transform.hasChanged Api来追踪Transform状态变化。
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// 用ClipperRegistry获得Clipping流程时间点。
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public virtual void PerformClipping()
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{
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if (IsTransformDirty(rectTransform))
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m_ShouldRecalculateClipRects = true;
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if (m_ShouldRecalculateClipRects)
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{
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m_ShouldRecalculateClipRects = false;
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ResetClipArea();
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}
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}
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public void AddClippable(UICameraMaskable clippable)
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{
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if (clippable == null)
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return;
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if (!maskableList.Contains(clippable))
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maskableList.Add(clippable);
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SetClipForOne(clippable);
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}
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public void RemoveClippable(UICameraMaskable clippable)
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{
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if (clippable == null)
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return;
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var index = maskableList.IndexOf(clippable);
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if (index >= 0)
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{
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maskableList.RemoveAt(index);
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RemoveClipForOne(clippable);
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}
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}
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private void ResetClipArea()
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{
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var corners = new Vector3[4];
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rectTransform.GetWorldCorners(corners);
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for (int i = 0; i < corners.Length; i++)
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{
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corners[i] = RectTransformUtility.WorldToScreenPoint(GetWorldCamera(), corners[i]);
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corners[i].x = corners[i].x / Screen.width * 2f - 1f;
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corners[i].y = corners[i].y / Screen.height * 2f - 1f;
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}
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clipArea = new Vector4(corners[0].x, corners[0].y, corners[2].x, corners[2].y);
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for (int i = 0; i < maskableList.Count; i++)
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SetClipForOne(maskableList[i]);
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}
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private void SetClipForOne(UICameraMaskable clippable)
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{
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clippable.SetClipRect(clipArea);
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}
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private Camera GetWorldCamera()
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{
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var uiManager = UIManager.Instance();
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if (uiManager)
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return uiManager.UICamera;
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else
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return Camera.main;
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}
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// 暂时使用transform.hasChanged api来检测Mask是否有变化
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Rect lastRect;
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private bool IsTransformDirty(RectTransform rectTransform)
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{
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bool result = false;
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if (rectTransform.hasChanged)
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{
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rectTransform.hasChanged = false;
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result = true;
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}
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else if (rectTransform.rect != lastRect)
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result = true;
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if (result)
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lastRect = rectTransform.rect;
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return result;
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}
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public static void RemoveClipForOne(UICameraMaskable clippable)
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{
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clippable.SetClipRect(new Vector4(-1f, -1f, 1f, 1f));
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}
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} |