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    def on_drag_listitem(self, evt):
        fdata = wx.FileDataObject()
        idx = -1
        while True: # find all the selected items and put them in a list
            idx = self.GetNextItem(
                idx,
                wx.LIST_NEXT_ALL,
                wx.LIST_STATE_SELECTED
            )
            if (idx == -1):
                break
            fdata.AddFile(self.list.GetItemText(idx))

        # Now make a data object for the  item list.
        data = wx.DataObjectComposite()
        data.Add(fdata)

        # Create drop source and begin drag-and-drop.
        dropSource = wx.DropSource(self)
        dropSource.SetData(data)
        res = dropSource.DoDragDrop(flags=wx.Drag_CopyOnly)