code: def treeItemMoved(self, item, parent, index):
      ##Item moved in tree; update Z values
      if parent is self.itemList.invisibleRootItem():
          item.canvasItem().setParentItem(self.view.childGroup)
      else:
          item.canvasItem().setParentItem(parent.canvasItem())
      siblings = [
          parent.child(i).canvasItem()
          for i in range(parent.childCount())
      ]
  
      zvals = [i.zValue() for i in siblings]
      zvals.sort(reverse=True)
  
      for i in range(len(siblings)):
          item = siblings[i]
          item.setZValue(zvals[i])
  
imports: import gc
  import importlib
  import weakref
  import warnings
  from ..graphicsItems.GridItem import GridItem
  from ..graphicsItems.ROI import ROI
  from ..graphicsItems.ViewBox import ViewBox
  from ..Qt import QT_LIB, QtCore, QtGui, QtWidgets
  from .None import CanvasTemplate_generic
  from .CanvasItem import CanvasItem, GroupCanvasItem
  from .CanvasManager import CanvasManager
label_desc: Use image node_id 23 for calling the Canvas obj's underlying member method code with example usage: obj.treeItemMoved(item, parent, index) without return types