private static void CreateEmptyDC(int index, UIWidget w)
    {
        SimpleDC dc = new SimpleDC(true, null, w.panel);

        dcList.Insert(index, dc);
        DrawCallData dcData = new DrawCallData();

        dcData.simple = dc;
        dcData.AddW(w);
        allWidgetDic.Add(dc, dcData);
    }
 private static void CreateEmptyDC(UIWidget w)
 {
     for (int j = 0; j < dcList.Count; j++)
     {
         var  d          = allWidgetDic[dcList[j]];
         bool needCreate = true;
         if (w.panel != d.simple.manager)
         {
             continue;
         }
         if (w.depth <= d.DepthStart)
         {
             if (d.simple.isEmpty)
             {
                 d.AddW(w);
                 return;
             }
             if (needCreate && j > 0)
             {
                 DrawCallData dpre = null;
                 for (int k = j - 1; k >= 0; k--)
                 {
                     if (dcList[k].manager == w.panel)
                     {
                         dpre = allWidgetDic[dcList[k]];
                         break;
                     }
                 }
                 if (dpre != null && dpre.simple.isEmpty)
                 {
                     if (dpre.simple.manager == w.panel)
                     {
                         dpre.AddW(w);
                         return;
                     }
                 }
             }
             CreateEmptyDC(j, w);
             return;
         }
         else
         {
             if (w.depth > d.DepthStart && w.depth < d.DepthEnd)
             {
                 if (d.simple.isEmpty)                    //空
                 {
                     d.AddW(w);
                     return;
                 }
                 else
                 {
                     CreateEmptyDC(j + 1, w);
                     //depth大的 移到后一个新dc中
                     SimpleDC newDC = new SimpleDC(false, d.simple.dc);
                     dcList.Insert(j + 2, newDC);
                     DrawCallData dcData = new DrawCallData();
                     dcData.simple = newDC;
                     allWidgetDic.Add(newDC, dcData);
                     for (int k = 0; k < d.widgets.Count; k++)
                     {
                         UIWidget temp = d.widgets[k];
                         if (temp.depth > w.depth)
                         {
                             dcData.AddW(temp);
                         }
                     }
                     for (int k = 0; k < dcData.widgets.Count; k++)
                     {
                         d.RemoveW(dcData.widgets[k]);
                     }
                     return;
                 }
             }
         }
     }
     CreateEmptyDC(dcList.Count, w);
 }