code: def treeItemSelected(self):
      sel = self.selectedItems()
  
      if len(sel) == 0:
          return
  
      multi = len(sel) > 1
      for i in self.items:
          ## updated the selected state of every item
          i.selectionChanged(i in sel, multi)
  
      if len(sel) == 1:
          self.multiSelectBox.hide()
          self.ui.mirrorSelectionBtn.hide()
          self.ui.reflectSelectionBtn.hide()
          self.ui.resetTransformsBtn.hide()
      elif len(sel) > 1:
          self.showMultiSelectBox()
  
      self.sigSelectionChanged.emit(self, sel)
  
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 10 for calling the Canvas obj's underlying member method code with example usage: obj.treeItemSelected() without return types