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using System.Collections.Generic;
using UnityEngine.UI.Collections;
namespace UnityEngine.UI
{
// 游戏中只有一份单例
public class GraphicRegistry
{
private static GraphicRegistry s_Instance;
// 按Canvas分类统计Graphic
private readonly Dictionary<Canvas, IndexedSet<Graphic>> m_Graphics = new Dictionary<Canvas, IndexedSet<Graphic>>();
protected GraphicRegistry()
{
// This is needed for AOT on IOS. Without it the compile doesn't get the definition of the Dictionarys
#pragma warning disable 168
Dictionary<Graphic, int> emptyGraphicDic;
Dictionary<ICanvasElement, int> emptyElementDic;
#pragma warning restore 168
}
public static GraphicRegistry instance
{
get
{
if (s_Instance == null)
s_Instance = new GraphicRegistry();
return s_Instance;
}
}
public static void RegisterGraphicForCanvas(Canvas c, Graphic graphic)
{
if (c == null)
return;
IndexedSet<Graphic> graphics;
instance.m_Graphics.TryGetValue(c, out graphics);
if (graphics != null)
{
graphics.AddUnique(graphic);
return;
}
// Dont need to AddUnique as we know its the only item in the list
graphics = new IndexedSet<Graphic>();
graphics.Add(graphic);
instance.m_Graphics.Add(c, graphics);
}
public static void UnregisterGraphicForCanvas(Canvas c, Graphic graphic)
{
if (c == null)
return;
IndexedSet<Graphic> graphics;
if (instance.m_Graphics.TryGetValue(c, out graphics))
{
graphics.Remove(graphic);
if (graphics.Count == 0)
instance.m_Graphics.Remove(c);
}
}
private static readonly List<Graphic> s_EmptyList = new List<Graphic>();
public static IList<Graphic> GetGraphicsForCanvas(Canvas canvas)
{
IndexedSet<Graphic> graphics;
if (instance.m_Graphics.TryGetValue(canvas, out graphics))
return graphics;
return s_EmptyList;
}
}
}
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