new example that Matt posted to comp.lang.python

diff --git a/Demo/tkinter/matt/two-radio-groups.py b/Demo/tkinter/matt/two-radio-groups.py
new file mode 100644 (file)
index 0000000..f65c8a9
--- /dev/null
+++ b/Demo/tkinter/matt/two-radio-groups.py
@@ -0,0 +1,118 @@
+from Tkinter import *
+
+#      The way to think about this is that each radio button menu
+#      controls a different variable -- clicking on one of the
+#      mutually exclusive choices in a radiobutton assigns some value
+#      to an application variable you provide. When you define a
+#      radiobutton menu choice, you have the option of specifying the
+#      name of a varaible and value to assign to that variable when
+#      that choice is selected. This clever mechanism relieves you,
+#      the programmer, from having to write a dumb callback that
+#      probably wouldn't have done anything more than an assignment
+#      anyway. The Tkinter options for this follow their Tk
+#      counterparts: 
+#      {"variable" : my_flavor_variable, "value" : "strawberry"}
+#       where my_flavor_variable is an instance of one of the
+#       subclasses of Variable, provided in Tkinter.py (there is
+#      StringVar(), IntVar(), DoubleVar() and BooleanVar() to choose
+#      from) 
+
+
+
+def makePoliticalParties():
+    # make menu button 
+    Radiobutton_button = Menubutton(mBar, {'text': 'Political Party', 
+                                          'underline': 0,
+                                          Pack: {'side': 'left', 
+                                                 'padx': '2m'}})
+    
+    # the primary pulldown
+    Radiobutton_button.menu = Menu(Radiobutton_button)
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Republican', 
+                                               'variable' : party, 
+                                               'value' : 1})
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Democrat', 
+                                               'variable' : party, 
+                                               'value' : 2})
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Libertarian', 
+                                               'variable' : party, 
+                                               'value' : 3})
+    
+    party.set(2)
+
+    # set up a pointer from the file menubutton back to the file menu
+    Radiobutton_button['menu'] = Radiobutton_button.menu
+
+    return Radiobutton_button
+
+
+def makeFlavors():
+    # make menu button 
+    Radiobutton_button = Menubutton(mBar, {'text': 'Flavors', 
+                                          'underline': 0,
+                                          Pack: {'side': 'left', 
+                                                 'padx': '2m'}})
+    # the primary pulldown
+    Radiobutton_button.menu = Menu(Radiobutton_button)
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Strawberry', 
+                                               'variable' : flavor, 
+                                               'value' : 'Strawberry'})
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Chocolate', 
+                                               'variable' : flavor, 
+                                               'value' : 'Chocolate'})
+
+    Radiobutton_button.menu.add('radiobutton', {'label': 'Rocky Road', 
+                                               'variable' : flavor, 
+                                               'value' : 'Rocky Road'})
+
+    # choose a default
+    flavor.set("Chocolate")
+
+    # set up a pointer from the file menubutton back to the file menu
+    Radiobutton_button['menu'] = Radiobutton_button.menu
+
+    return Radiobutton_button
+
+
+def printStuff():
+    print "party is", party.get()
+    print "flavor is", flavor.get()
+    print ""
+
+#################################################
+#### Main starts here ...
+root = Tk()
+
+
+# make a menu bar
+mBar = Frame(root, {'relief': 'raised', 
+                   'bd': 2,
+                   Pack: {'side': 'top', 
+                          'fill': 'x'}})
+
+# make two application variables, 
+# one to control each radio button set
+party = IntVar()
+flavor = StringVar()
+
+Radiobutton_button = makePoliticalParties()
+Radiobutton_button2 = makeFlavors()
+
+# finally, install the buttons in the menu bar. 
+# This allows for scanning from one menubutton to the next.
+mBar.tk_menuBar(Radiobutton_button, Radiobutton_button2)
+
+b = Button(root, {"text": "print party and flavor", 
+                 "command" : printStuff, 
+                 "fg":  "red"})
+b.pack({"side" : "top"})
+
+root.title('menu demo')
+root.iconname('menu demo')
+
+root.mainloop()