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():
  23     # make menu button
  24     Radiobutton_button = Menubutton(mBar, {'text': 'Political Party',
  25                                            'underline': 0,
  26                                            Pack: {'side': 'left',
  27                                                   'padx': '2m'}})
  28
  29     # the primary pulldown
  30     Radiobutton_button.menu = Menu(Radiobutton_button)
  31
  32     Radiobutton_button.menu.add('radiobutton', {'label': 'Republican',
  33                                                 'variable' : party,
  34                                                 'value' : 1})
  35
  36     Radiobutton_button.menu.add('radiobutton', {'label': 'Democrat',
  37                                                 'variable' : party,
  38                                                 'value' : 2})
  39
  40     Radiobutton_button.menu.add('radiobutton', {'label': 'Libertarian',
  41                                                 'variable' : party,
  42                                                 'value' : 3})
  43
  44     party.set(2)
  45
  46     # set up a pointer from the file menubutton back to the file menu
  47     Radiobutton_button['menu'] = Radiobutton_button.menu
  48
  49     return Radiobutton_button
  50
  51
  52 def makeFlavors():
  53     # make menu button
  54     Radiobutton_button = Menubutton(mBar, {'text': 'Flavors',
  55                                            'underline': 0,
  56                                            Pack: {'side': 'left',
  57                                                   'padx': '2m'}})
  58     # the primary pulldown
  59     Radiobutton_button.menu = Menu(Radiobutton_button)
  60
  61     Radiobutton_button.menu.add('radiobutton', {'label': 'Strawberry',
  62                                                 'variable' : flavor,
  63                                                 'value' : 'Strawberry'})
  64
  65     Radiobutton_button.menu.add('radiobutton', {'label': 'Chocolate',
  66                                                 'variable' : flavor,
  67                                                 'value' : 'Chocolate'})
  68
  69     Radiobutton_button.menu.add('radiobutton', {'label': 'Rocky Road',
  70                                                 'variable' : flavor,
  71                                                 'value' : 'Rocky Road'})
  72
  73     # choose a default
  74     flavor.set("Chocolate")
  75
  76     # set up a pointer from the file menubutton back to the file menu
  77     Radiobutton_button['menu'] = Radiobutton_button.menu
  78
  79     return Radiobutton_button
  80
  81
  82 def printStuff():
  83     print "party is", party.get()
  84     print "flavor is", flavor.get()
  85     print ""
  86
  87 #################################################
  88 #### Main starts here ...
  89 root = Tk()
  90
  91
  92 # make a menu bar
  93 mBar = Frame(root, {'relief': 'raised',
  94                     'bd': 2,
  95                     Pack: {'side': 'top',
  96                            'fill': 'x'}})
  97
  98 # make two application variables,
  99 # one to control each radio button set
 100 party = IntVar()
 101 flavor = StringVar()
 102
 103 Radiobutton_button = makePoliticalParties()
 104 Radiobutton_button2 = makeFlavors()
 105
 106 # finally, install the buttons in the menu bar.
 107 # This allows for scanning from one menubutton to the next.
 108 mBar.tk_menuBar(Radiobutton_button, Radiobutton_button2)
 109
 110 b = Button(root, {"text": "print party and flavor",
 111                   "command" : printStuff,
 112                   "fg":  "red"})
 113 b.pack({"side" : "top"})
 114
 115 root.title('menu demo')
 116 root.iconname('menu demo')
 117
 118 root.mainloop()