code: def on_paint(self, event):
      if self.GetChildrenCount(self.root_id) == 0:
          """Handle the paint event"""
          assert isinstance(event, wx.PaintEvent)
          paint_dc = wx.BufferedPaintDC(self)
          paint_dc.SetBackground(
              wx.Brush(
                  wx.SystemSettings.GetColour(wx.SYS_COLOUR_WINDOW)
              )
          )
          paint_dc.Clear()
          text = DROP_FILES_AND_FOLDERS_HERE
          font = self._drop_files_font
          paint_dc.SetTextForeground(
              wx.SystemSettings.GetColour(wx.SYS_COLOUR_GRAYTEXT)
          )
          paint_dc.SetFont(font)
          paint_dc.DrawLabel(
              text,
              wx.Bitmap(),
              wx.Rect(self.GetSize()),
              alignment=wx.ALIGN_CENTER,
          )
          paint_dc.Destroy()
      else:
          event.Skip()
  
imports: import logging
  import os
  import sys
  import uuid
  from urllib.request import url2pathname
  from urllib.parse import urlparse
  import wx
  import wx.lib.scrolledpanel
  from cellprofiler_core.pipeline import ImageFile
  from cellprofiler_core.preferences import report_progress
label_desc: Use image node_id 32 for calling the PathListCtrl obj's underlying member method code with example usage: obj.on_paint(event) without return types