text: """
  Dialog for building Tkinter accelerator key bindings
  """
  from tkinter import *
  from tkinter.ttk import Scrollbar
  from tkinter import messagebox
  import string
  import sys
  
  
  class GetKeysDialog(Toplevel):
  
      # Dialog title for invalid key sequence
      keyerror_title = 'Key Sequence Error'
  
      def __init__(self, parent, title, action, currentKeySequences,
                   *, _htest=False, _utest=False):
          """
          action - string, the name of the virtual event these keys will be
                   mapped to
          currentKeys - list, a list of all key sequence lists currently mapped
                   to virtual events, for overlap checking
          _utest - bool, do not wait when running unittest
          _htest - bool, change box location when running htest
          """
          Toplevel.__init__(self, parent)
          self.withdraw() #hide while setting geometry
          self.configure(borderwidth=5)
          self.resizable(height=FALSE, width=FALSE)
          self.title(title)
          self.transient(parent)
          self.grab_set()
          self.protocol("WM_DELETE_WINDOW", self.Cancel)
          self.parent = parent
          self.action=action
          self.currentKeySequences = currentKeySequences
          self.result = ''
          self.keyString = StringVar(self)
          self.keyString.set('')
          self.SetModifiersForPlatform() # set self.modifiers, self.modifier_label
          self.modifier_vars = []
          for modifier in self.modifiers:
              variable = StringVar(self)
              variable.set('')
              self.modifier_vars.append(variable)
          self.advanced = False
          self.CreateWidgets()
          self.LoadFinalKeyList()
          self.update_idletasks()
          self.geometry(
                  "+%d+%d" % (
                      parent.winfo_rootx() +
                      (parent.winfo_width()/2 - self.winfo_reqwidth()/2),
                      parent.winfo_rooty() +
                      ((parent.winfo_height()/2 - self.winfo_reqheight()/2)
                      if not _htest else 150)
                  ) )  #centre dialog over parent (or below htest box)
          if not _utest:
              self.deiconify() #geometry set, unhide
              self.wait_window()
  
      def showerror(self, *args, **kwargs):
          # Make testing easier.  Replace in #30751.
          messagebox.showerror(*args, **kwargs)
  
      def CreateWidgets(self):
          frameMain = Frame(self,borderwidth=2,relief=SUNKEN)
          frameMain.pack(side=TOP,expand=TRUE,fill=BOTH)
          frameButtons=Frame(self)
          frameButtons.pack(side=BOTTOM,fill=X)
          self.buttonOK = Button(frameButtons,text='OK',
                  width=8,command=self.OK)
          self.buttonOK.grid(row=0,column=0,padx=5,pady=5)
          self.buttonCancel = Button(frameButtons,text='Cancel',
                  width=8,command=self.Cancel)
          self.buttonCancel.grid(row=0,column=1,padx=5,pady=5)
          self.frameKeySeqBasic = Frame(frameMain)
          self.frameKeySeqAdvanced = Frame(frameMain)
          self.frameControlsBasic = Frame(frameMain)
          self.frameHelpAdvanced = Frame(frameMain)
          self.frameKeySeqAdvanced.grid(row=0,column=0,sticky=NSEW,padx=5,pady=5)
          self.frameKeySeqBasic.grid(row=0,column=0,sticky=NSEW,padx=5,pady=5)
          self.frameKeySeqBasic.lift()
          self.frameHelpAdvanced.grid(row=1,column=0,sticky=NSEW,padx=5)
          self.frameControlsBasic.grid(row=1,column=0,sticky=NSEW,padx=5)
          self.frameControlsBasic.lift()
          self.buttonLevel = Button(frameMain,command=self.ToggleLevel,
                  text='Advanced Key Binding Entry >>')
          self.buttonLevel.grid(row=2,column=0,stick=EW,padx=5,pady=5)
          labelTitleBasic = Label(self.frameKeySeqBasic,
                  text="New keys for  '"+self.action+"' :")
          labelTitleBasic.pack(anchor=W)
          labelKeysBasic = Label(self.frameKeySeqBasic,justify=LEFT,
                  textvariable=self.keyString,relief=GROOVE,borderwidth=2)
          labelKeysBasic.pack(ipadx=5,ipady=5,fill=X)
          self.modifier_checkbuttons = {}
          column = 0
          for modifier, variable in zip(self.modifiers, self.modifier_vars):
              label = self.modifier_label.get(modifier, modifier)
              check=Checkbutton(self.frameControlsBasic,
                  command=self.BuildKeyString,
                  text=label,variable=variable,onvalue=modifier,offvalue='')
              check.grid(row=0,column=column,padx=2,sticky=W)
              self.modifier_checkbuttons[modifier] = check
              column += 1
          labelFnAdvice=Label(self.frameControlsBasic,justify=LEFT,
                              text=\
                              "Select the desired modifier keys\n"+
                              "above, and the final key from the\n"+
                              "list on the right.\n\n" +
                              "Use upper case Symbols when using\n" +
                              "the Shift modifier.  (Letters will be\n" +
                              "converted automatically.)")
          labelFnAdvice.grid(row=1,column=0,columnspan=4,padx=2,sticky=W)
          self.listKeysFinal=Listbox(self.frameControlsBasic,width=15,height=10,
                  selectmode=SINGLE)
          self.listKeysFinal.bind('<ButtonRelease-1>',self.FinalKeySelected)
          self.listKeysFinal.grid(row=0,column=4,rowspan=4,sticky=NS)
          scrollKeysFinal=Scrollbar(self.frameControlsBasic,orient=VERTICAL,
                  command=self.listKeysFinal.yview)
          self.listKeysFinal.config(yscrollcommand=scrollKeysFinal.set)
          scrollKeysFinal.grid(row=0,column=5,rowspan=4,sticky=NS)
          self.buttonClear=Button(self.frameControlsBasic,
                  text='Clear Keys',command=self.ClearKeySeq)
          self.buttonClear.grid(row=2,column=0,columnspan=4)
          labelTitleAdvanced = Label(self.frameKeySeqAdvanced,justify=LEFT,
                  text="Enter new binding(s) for  '"+self.action+"' :\n"+
                  "(These bindings will not be checked for validity!)")
          labelTitleAdvanced.pack(anchor=W)
          self.entryKeysAdvanced=Entry(self.frameKeySeqAdvanced,
                  textvariable=self.keyString)
          self.entryKeysAdvanced.pack(fill=X)
          labelHelpAdvanced=Label(self.frameHelpAdvanced,justify=LEFT,
              text="Key bindings are specified using Tkinter keysyms as\n"+
                   "in these samples: <Control-f>, <Shift-F2>, <F12>,\n"
                   "<Control-space>, <Meta-less>, <Control-Alt-Shift-X>.\n"
                   "Upper case is used when the Shift modifier is present!\n\n" +
                   "'Emacs style' multi-keystroke bindings are specified as\n" +
                   "follows: <Control-x><Control-y>, where the first key\n" +
                   "is the 'do-nothing' keybinding.\n\n" +
                   "Multiple separate bindings for one action should be\n"+
                   "separated by a space, eg., <Alt-v> <Meta-v>." )
          labelHelpAdvanced.grid(row=0,column=0,sticky=NSEW)
  
      def SetModifiersForPlatform(self):
          """Determine list of names of key modifiers for this platform.
  
          The names are used to build Tk bindings -- it doesn't matter if the
          keyboard has these keys, it matters if Tk understands them. The
          order is also important: key binding equality depends on it, so
          config-keys.def must use the same ordering.
          """
          if sys.platform == "darwin":
              self.modifiers = ['Shift', 'Control', 'Option', 'Command']
          else:
              self.modifiers = ['Control', 'Alt', 'Shift']
          self.modifier_label = {'Control': 'Ctrl'} # short name
  
      def ToggleLevel(self):
          if  self.buttonLevel.cget('text')[:8]=='Advanced':
              self.ClearKeySeq()
              self.buttonLevel.config(text='<< Basic Key Binding Entry')
              self.frameKeySeqAdvanced.lift()
              self.frameHelpAdvanced.lift()
              self.entryKeysAdvanced.focus_set()
              self.advanced = True
          else:
              self.ClearKeySeq()
              self.buttonLevel.config(text='Advanced Key Binding Entry >>')
              self.frameKeySeqBasic.lift()
              self.frameControlsBasic.lift()
              self.advanced = False
  
      def FinalKeySelected(self,event):
          self.BuildKeyString()
  
      def BuildKeyString(self):
          keyList = modifiers = self.GetModifiers()
          finalKey = self.listKeysFinal.get(ANCHOR)
          if finalKey:
              finalKey = self.TranslateKey(finalKey, modifiers)
              keyList.append(finalKey)
          self.keyString.set('<' + '-'.join(keyList) + '>')
  
      def GetModifiers(self):
          modList = [variable.get() for variable in self.modifier_vars]
          return [mod for mod in modList if mod]
  
      def ClearKeySeq(self):
          self.listKeysFinal.select_clear(0,END)
          self.listKeysFinal.yview(MOVETO, '0.0')
          for variable in self.modifier_vars:
              variable.set('')
          self.keyString.set('')
  
      def LoadFinalKeyList(self):
          #these tuples are also available for use in validity checks
          self.functionKeys=('F1','F2','F3','F4','F5','F6','F7','F8','F9',
                  'F10','F11','F12')
          self.alphanumKeys=tuple(string.ascii_lowercase+string.digits)
          self.punctuationKeys=tuple('~!@#%^&*()_-+={}[]|;:,.<>/?')
          self.whitespaceKeys=('Tab','Space','Return')
          self.editKeys=('BackSpace','Delete','Insert')
          self.moveKeys=('Home','End','Page Up','Page Down','Left Arrow',
                  'Right Arrow','Up Arrow','Down Arrow')
          #make a tuple of most of the useful common 'final' keys
          keys=(self.alphanumKeys+self.punctuationKeys+self.functionKeys+
                  self.whitespaceKeys+self.editKeys+self.moveKeys)
          self.listKeysFinal.insert(END, *keys)
  
      def TranslateKey(self, key, modifiers):
          "Translate from keycap symbol to the Tkinter keysym"
          translateDict = {'Space':'space',
                  '~':'asciitilde','!':'exclam','@':'at','#':'numbersign',
                  '%':'percent','^':'asciicircum','&':'ampersand','*':'asterisk',
                  '(':'parenleft',')':'parenright','_':'underscore','-':'minus',
                  '+':'plus','=':'equal','{':'braceleft','}':'braceright',
                  '[':'bracketleft',']':'bracketright','|':'bar',';':'semicolon',
                  ':':'colon',',':'comma','.':'period','<':'less','>':'greater',
                  '/':'slash','?':'question','Page Up':'Prior','Page Down':'Next',
                  'Left Arrow':'Left','Right Arrow':'Right','Up Arrow':'Up',
                  'Down Arrow': 'Down', 'Tab':'Tab'}
          if key in translateDict:
              key = translateDict[key]
          if 'Shift' in modifiers and key in string.ascii_lowercase:
              key = key.upper()
          key = 'Key-' + key
          return key
  
      def OK(self, event=None):
          keys = self.keyString.get().strip()
          if not keys:
              self.showerror(title=self.keyerror_title, parent=self,
                             message="No key specified.")
              return
          if (self.advanced or self.KeysOK(keys)) and self.bind_ok(keys):
              self.result = keys
          self.grab_release()
          self.destroy()
  
      def Cancel(self, event=None):
          self.result=''
          self.grab_release()
          self.destroy()
  
      def KeysOK(self, keys):
          '''Validity check on user's 'basic' keybinding selection.
  
          Doesn't check the string produced by the advanced dialog because
          'modifiers' isn't set.
  
          '''
          finalKey = self.listKeysFinal.get(ANCHOR)
          modifiers = self.GetModifiers()
          keysOK = False
          title = self.keyerror_title
          key_sequences = [key for keylist in self.currentKeySequences
                               for key in keylist]
          if not keys.endswith('>'):
              self.showerror(title, parent=self,
                             message='Missing the final Key')
          elif (not modifiers
                and finalKey not in self.functionKeys + self.moveKeys):
              self.showerror(title=title, parent=self,
                             message='No modifier key(s) specified.')
          elif (modifiers == ['Shift']) \
                   and (finalKey not in
                        self.functionKeys + self.moveKeys + ('Tab', 'Space')):
              msg = 'The shift modifier by itself may not be used with'\
                    ' this key symbol.'
              self.showerror(title=title, parent=self, message=msg)
          elif keys in key_sequences:
              msg = 'This key combination is already in use.'
              self.showerror(title=title, parent=self, message=msg)
          else:
              keysOK = True
          return keysOK
  
      def bind_ok(self, keys):
          "Return True if Tcl accepts the new keys else show message."
  
          try:
              binding = self.bind(keys, lambda: None)
          except TclError as err:
              self.showerror(
                      title=self.keyerror_title, parent=self,
                      message=(f'The entered key sequence is not accepted.\n\n'
                               f'Error: {err}'))
              return False
          else:
              self.unbind(keys, binding)
              return True
  
  
  if __name__ == '__main__':
      from unittest import main
      main('idlelib.idle_test.test_config_key', verbosity=2, exit=False)
  
      from idlelib.idle_test.htest import run
      run(GetKeysDialog)
  