Demo/tkinter/matt/two-radio-groups.py

   1 from Tkinter import *
   2
   3 #       The way to think about this is that each radio button menu
   4 #       controls a different variable -- clicking on one of the
   5 #       mutually exclusive choices in a radiobutton assigns some value
   6 #       to an application variable you provide. When you define a
   7 #       radiobutton menu choice, you have the option of specifying the
   8 #       name of a varaible and value to assign to that variable when
   9 #       that choice is selected. This clever mechanism relieves you,
  10 #       the programmer, from having to write a dumb callback that
  11 #       probably wouldn't have done anything more than an assignment
  12 #       anyway. The Tkinter options for this follow their Tk
  13 #       counterparts:
  14 #       {"variable" : my_flavor_variable, "value" : "strawberry"}
  15 #       where my_flavor_variable is an instance of one of the
  16 #       subclasses of Variable, provided in Tkinter.py (there is
  17 #       StringVar(), IntVar(), DoubleVar() and BooleanVar() to choose
  18 #       from)
  19
  20
  21
  22 def makePoliticalParties(var):
  23     # make menu button
  24     Radiobutton_button = Menubutton(mBar, text='Political Party',
  25                                     underline=0)
  26     Radiobutton_button.pack(side=LEFT, padx='2m')
  27
  28     # the primary pulldown
  29     Radiobutton_button.menu = Menu(Radiobutton_button)
  30
  31     Radiobutton_button.menu.add_radiobutton(label='Republican',
  32                                             variable=var, value=1)
  33
  34     Radiobutton_button.menu.add('radiobutton', {'label': 'Democrat',
  35                                                 'variable' : var,
  36                                                 'value' : 2})
  37
  38     Radiobutton_button.menu.add('radiobutton', {'label': 'Libertarian',
  39                                                 'variable' : var,
  40                                                 'value' : 3})
  41
  42     var.set(2)
  43
  44     # set up a pointer from the file menubutton back to the file menu
  45     Radiobutton_button['menu'] = Radiobutton_button.menu
  46
  47     return Radiobutton_button
  48
  49
  50 def makeFlavors(var):
  51     # make menu button
  52     Radiobutton_button = Menubutton(mBar, text='Flavors',
  53                                     underline=0)
  54     Radiobutton_button.pack(side=LEFT, padx='2m')
  55
  56     # the primary pulldown
  57     Radiobutton_button.menu = Menu(Radiobutton_button)
  58
  59     Radiobutton_button.menu.add_radiobutton(label='Strawberry',
  60                                             variable=var, value='Strawberry')
  61
  62     Radiobutton_button.menu.add_radiobutton(label='Chocolate',
  63                                             variable=var, value='Chocolate')
  64
  65     Radiobutton_button.menu.add_radiobutton(label='Rocky Road',
  66                                             variable=var, value='Rocky Road')
  67
  68     # choose a default
  69     var.set("Chocolate")
  70
  71     # set up a pointer from the file menubutton back to the file menu
  72     Radiobutton_button['menu'] = Radiobutton_button.menu
  73
  74     return Radiobutton_button
  75
  76
  77 def printStuff():
  78     print "party is", party.get()
  79     print "flavor is", flavor.get()
  80     print
  81
  82 #################################################
  83 #### Main starts here ...
  84 root = Tk()
  85
  86
  87 # make a menu bar
  88 mBar = Frame(root, relief=RAISED, borderwidth=2)
  89 mBar.pack(fill=X)
  90
  91 # make two application variables,
  92 # one to control each radio button set
  93 party = IntVar()
  94 flavor = StringVar()
  95
  96 Radiobutton_button = makePoliticalParties(party)
  97 Radiobutton_button2 = makeFlavors(flavor)
  98
  99 # finally, install the buttons in the menu bar.
 100 # This allows for scanning from one menubutton to the next.
 101 mBar.tk_menuBar(Radiobutton_button, Radiobutton_button2)
 102
 103 b = Button(root, text="print party and flavor", foreground="red",
 104            command=printStuff)
 105 b.pack(side=TOP)
 106
 107 root.title('menu demo')
 108 root.iconname('menu demo')
 109
 110 root.mainloop()