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using System.Collections.Generic;
using UnityEngine.EventSystems;
namespace UnityEngine.UI
{
public class MaskUtilities
{
public static void Notify2DMaskStateChanged(Component mask)
{
var components = ListPool<Component>.Get();
mask.GetComponentsInChildren(components);
for (var i = 0; i < components.Count; i++)
{
if (components[i] == null || components[i].gameObject == mask.gameObject)
continue;
var toNotify = components[i] as IClippable;
if (toNotify != null)
toNotify.RecalculateClipping();
}
ListPool<Component>.Release(components);
}
public static void NotifyStencilStateChanged(Component mask)
{
var components = ListPool<Component>.Get();
mask.GetComponentsInChildren(components);
for (var i = 0; i < components.Count; i++)
{
if (components[i] == null || components[i].gameObject == mask.gameObject)
continue;
var toNotify = components[i] as IMaskable;
if (toNotify != null)
toNotify.RecalculateMasking();
}
ListPool<Component>.Release(components);
}
//从下往上找到第一个OverrideSorting的canvas或者root(即null)
public static Transform FindRootSortOverrideCanvas(Transform start)
{
var canvasList = ListPool<Canvas>.Get();
start.GetComponentsInParent(false, canvasList);
Canvas canvas = null;
for (int i = 0; i < canvasList.Count; ++i)
{
canvas = canvasList[i];
// We found the canvas we want to use break
if (canvas.overrideSorting)
break;
}
ListPool<Canvas>.Release(canvasList);
return canvas != null ? canvas.transform : null;
}
// 返回Mask在canvas下（canvas下所有的masks下)的深度
public static int GetStencilDepth(Transform transform, Transform stopAfter)
{
var depth = 0;
if (transform == stopAfter)
return depth;
var t = transform.parent;
var components = ListPool<Mask>.Get();
while (t != null)
{
t.GetComponents<Mask>(components);
for (var i = 0; i < components.Count; ++i)
{
if (components[i] != null && components[i].MaskEnabled() && components[i].graphic.IsActive())
{
++depth;
break;
}
}
if (t == stopAfter)
break;
t = t.parent;
}
ListPool<Mask>.Release(components);
return depth;
}
// father是child的祖先节点或者father == child
public static bool IsDescendantOrSelf(Transform father, Transform child)
{
if (father == null || child == null)
return false;
if (father == child)
return true;
while (child.parent != null)
{
if (child.parent == father)
return true;
child = child.parent;
}
return false;
}
public static RectMask2D GetRectMaskForClippable(IClippable clippable)
{
List<RectMask2D> rectMaskComponents = ListPool<RectMask2D>.Get();
List<Canvas> canvasComponents = ListPool<Canvas>.Get();
RectMask2D componentToReturn = null;
clippable.rectTransform.GetComponentsInParent(false, rectMaskComponents);
if (rectMaskComponents.Count > 0)
{
for (int rmi = 0; rmi < rectMaskComponents.Count; rmi++)
{
componentToReturn = rectMaskComponents[rmi];
if (componentToReturn.gameObject == clippable.gameObject)
{
componentToReturn = null;
continue;
}
if (!componentToReturn.isActiveAndEnabled)
{
componentToReturn = null;
continue;
}
clippable.rectTransform.GetComponentsInParent(false, canvasComponents);
for (int i = canvasComponents.Count - 1; i >= 0; i--)
{
if (!IsDescendantOrSelf(canvasComponents[i].transform, componentToReturn.transform) && canvasComponents[i].overrideSorting)
{
componentToReturn = null;
break;
}
}
return componentToReturn;
}
}
ListPool<RectMask2D>.Release(rectMaskComponents);
ListPool<Canvas>.Release(canvasComponents);
return componentToReturn;
}
public static void GetRectMasksForClip(RectMask2D clipper, List<RectMask2D> masks)
{
masks.Clear();
List<Canvas> canvasComponents = ListPool<Canvas>.Get();
List<RectMask2D> rectMaskComponents = ListPool<RectMask2D>.Get();
clipper.transform.GetComponentsInParent(false, rectMaskComponents);
if (rectMaskComponents.Count > 0)
{
clipper.transform.GetComponentsInParent(false, canvasComponents);
for (int i = rectMaskComponents.Count - 1; i >= 0; i--)
{
if (!rectMaskComponents[i].IsActive())
continue;
bool shouldAdd = true;
for (int j = canvasComponents.Count - 1; j >= 0; j--)
{
// 如果rectMask2D是canvas的祖先节点且这个canvas勾选了OverrideSorting,那么这个rectMask2D就会失效
if (!IsDescendantOrSelf(canvasComponents[j].transform, rectMaskComponents[i].transform)
&& canvasComponents[j].overrideSorting)
{
shouldAdd = false;
break;
}
}
if (shouldAdd)
masks.Add(rectMaskComponents[i]);
}
}
ListPool<RectMask2D>.Release(rectMaskComponents);
ListPool<Canvas>.Release(canvasComponents);
}
}
}
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