1 files changed, 198 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/RectMask2D.cs b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/RectMask2D.cs
new file mode 100644
index 0000000..d973b34
--- /dev/null
+++ b/Assets/uGUI-2017.1/UnityEngine.UI/UI/Core/Mask/RectMask2D.cs
@@ -0,0 +1,198 @@
+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 
+
+    }
+}