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Dialog for building Tkinter accelerator key bindings
"""
from Tkinter import *
import tkMessageBox
import string

class GetKeysDialog(Toplevel):
    def __init__(self,parent,title,action,currentKeySequences):
        """
        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
        """
        Toplevel.__init__(self, parent)
        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.withdraw() #hide while setting geometry
        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)) )) ) #centre dialog over parent
        self.deiconify() #geometry set, unhide
        self.wait_window()

    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