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using System;
using System.Collections.Generic;
using UnityEngine.EventSystems;
namespace UnityEngine.UI
{
[AddComponentMenu("UI/Rect Mask 2D", 13)]
[ExecuteInEditMode]
[DisallowMultipleComponent]
[RequireComponent(typeof(RectTransform))]
public class RectMask2D : UIBehaviour, IClipper, ICanvasRaycastFilter
{
[NonSerialized]
private readonly RectangularVertexClipper m_VertexClipper = new RectangularVertexClipper();
[NonSerialized]
private RectTransform m_RectTransform;
// 可裁剪的Graphics
[NonSerialized]
private HashSet<IClippable> m_ClipTargets = new HashSet<IClippable>();
[NonSerialized]
private bool m_ShouldRecalculateClipRects;
// 父节点的所有RectMask2D，用来算交集
[NonSerialized]
private List<RectMask2D> m_Clippers = new List<RectMask2D>();
[NonSerialized]
private Rect m_LastClipRectCanvasSpace;
[NonSerialized]
private bool m_LastValidClipRect;
[NonSerialized]
private bool m_ForceClip;
public Rect canvasRect
{
get
{
Canvas canvas = null;
var list = ListPool<Canvas>.Get();
gameObject.GetComponentsInParent(false, list);
if (list.Count > 0)
canvas = list[list.Count - 1];
ListPool<Canvas>.Release(list);
return m_VertexClipper.GetCanvasRect(rectTransform, canvas);
}
}
public RectTransform rectTransform
{
get { return m_RectTransform ?? (m_RectTransform = GetComponent<RectTransform>()); }
}
protected RectMask2D()
{}
protected override void OnEnable()
{
base.OnEnable();
m_ShouldRecalculateClipRects = true;
ClipperRegistry.Register(this);
MaskUtilities.Notify2DMaskStateChanged(this);
}
protected override void OnDisable()
{
// we call base OnDisable first here
// as we need to have the IsActive return the
// correct value when we notify the children
// that the mask state has changed.
base.OnDisable();
m_ClipTargets.Clear();
m_Clippers.Clear();
ClipperRegistry.Unregister(this);
MaskUtilities.Notify2DMaskStateChanged(this);
}
#if UNITY_EDITOR
protected override void OnValidate()
{
base.OnValidate();
m_ShouldRecalculateClipRects = true;
if (!IsActive())
return;
MaskUtilities.Notify2DMaskStateChanged(this);
}
#endif
public virtual bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
{
if (!isActiveAndEnabled)
return true;
return RectTransformUtility.RectangleContainsScreenPoint(rectTransform, sp, eventCamera);
}
public virtual void PerformClipping()
{
//TODO See if an IsActive() test would work well here or whether it might cause unexpected side effects (re case 776771)
// if the parents are changed
// or something similar we
// do a recalculate here
if (m_ShouldRecalculateClipRects)
{
MaskUtilities.GetRectMasksForClip(this, m_Clippers);
m_ShouldRecalculateClipRects = false;
}
// 裁剪
// get the compound rects from
// the clippers that are valid
bool validRect = true;
Rect clipRect = Clipping.FindCullAndClipWorldRect(m_Clippers, out validRect);
bool clipRectChanged = clipRect != m_LastClipRectCanvasSpace;
if (clipRectChanged || m_ForceClip)
{
foreach (IClippable clipTarget in m_ClipTargets)
clipTarget.SetClipRect(clipRect, validRect);
m_LastClipRectCanvasSpace = clipRect;
m_LastValidClipRect = validRect;
}
// 剔除
foreach (IClippable clipTarget in m_ClipTargets)
{
var maskable = clipTarget as MaskableGraphic;
if (maskable != null && !maskable.canvasRenderer.hasMoved && !clipRectChanged)
continue;
clipTarget.Cull(m_LastClipRectCanvasSpace, m_LastValidClipRect);
}
}
public void AddClippable(IClippable clippable)
{
if (clippable == null)
return;
m_ShouldRecalculateClipRects = true;
if (!m_ClipTargets.Contains(clippable))
m_ClipTargets.Add(clippable);
m_ForceClip = true;
}
public void RemoveClippable(IClippable clippable)
{
if (clippable == null)
return;
m_ShouldRecalculateClipRects = true;
clippable.SetClipRect(new Rect(), false);
m_ClipTargets.Remove(clippable);
m_ForceClip = true;
}
protected override void OnTransformParentChanged()
{
base.OnTransformParentChanged();
m_ShouldRecalculateClipRects = true;
}
protected override void OnCanvasHierarchyChanged()
{
base.OnCanvasHierarchyChanged();
m_ShouldRecalculateClipRects = true;
}
#region UGUI_DEBUG
Vector3[] cornors = new Vector3[4];
void OnDrawGizmos()
{
Rect rect = rectTransform.rect;
Gizmos.color = Color.red;
rectTransform.GetWorldCorners(cornors);
for (int i = 0; i < cornors.Length; ++i)
{
Gizmos.DrawLine(cornors[i], cornors[(i + 1) % cornors.Length]);
}
}
#endregion
}
}
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