Pmw optionMenu dynamic contents display?

[stewart]

I'm writing an app that requires a 3-level optionMenu display. Basically
I'm showing the contents of a 3-dimensional matrix. You choose the first
level in the first optionMenu, the 2nd level in the next level, and the 3rd
level in the last optionMenu. Let's call them Continent,count ry,state.

continentList = ['N.America', 'S. America', 'Europe', 'Asia', Africa',
'Australia', 'Antarctica']
countryList = [['Canada', 'USA', 'Mexico'],['Argentina','Ch ile', ..],[other
continents' countries... ]]
stateList = [[['BC','Alberta', ...
'Newfoundland'],['California','O regon',...'Main e'],['Guadalajara',. ..]],[[other
continents' countries' states]]

When I open the window, all is well. I can display the following as default
selections:
[ N. America ]
[ Canada ]
[ B.C. ]

Making a selection of a continent, country or state invokes a _getSelection
method that displays the 3 choices. So far so good.

Also, if I change the continent selection, then I get a different default
country in the 2nd optionMenu. But, this is where is goes wrong. I can't
get the list of countries to be updated in the 2nd optionMenu, nor the list
of states to be updated in the state list. How would I do this?

I've tried to include some code at the end of the _getSelection method but
it isn't working. Does anyone has any similar code that they can share?

global continentItems, countryItems, stateItems

def _getSelection(s elf, choice):
print 'you have chosen %s %s %s' % \
(self.var1.get( ),
self.var2.get() ,
self.var3.get() )
# above code correctly prints the selected choices from all 3 levels
# next part of code tries to re-draw country list based on
# continent selection, but it doesn't work.
# next line successfully gets list index of chosen continent
i2 = indexContinents (self.var1.get( )
# first item in countryList is name of associated continent
self.var2.set(c ountryList[i2][0])
# next line correctly contains list of countries for selected continent
countryItems = countryList[i2]
# next line croaks: trying to change the 'items' option for optionMenu
# by directly addressing its 'items' parameter: no good
self.method2_me nu.config(items = countryItems)

stuck here!

[stewart]

Here's a test app to demonstrate the concept, and the difficulty.

#file testselectstate .py
title = 'LeakWarn System Selection'

# Import Pmw from this directory tree.
import sys
sys.path[:0] = ['../../..']

import Tkinter
import Pmw, re

global continentList, countryList, stateList

continentList = ['N.America','C. America', 'S. America']
countryList = [['Canada','USA', 'Mexico'],
['Guatemala','Ni caragua','Panam a'],
['Venezuela','Co lombia','Ecuado r']]
stateList = [[['BC','Alberta', 'Saskatchewan', 'others'],
['California','O regon','Washing ton','others'],
['Michoacan','Oa xaca','Monterre y','others']],
[['Guatemala states'],['Nicaragua states'],['Panama states']],
[['Venezuela states'],['Colombia states'],['Ecuador states']]]

# default selection
continentItem = continentList[0]
countryItem = countryList[0][0]
stateItem = stateList[0][0][0]

class selectSystem:
def __init__(self, parent):
# Create and pack the OptionMenu megawidgets.
# The first one has a textvariable.
self.var1 = Tkinter.StringV ar()
self.var2 = Tkinter.StringV ar()
self.var3 = Tkinter.StringV ar()
self.var1.set(c ontinentItem) # N. America
self.var2.set(c ountryItem) # Canada
self.var3.set(s tateItem) # B.C.

self.method1_me nu = Pmw.OptionMenu( parent,
labelpos = 'w',
label_text = 'Select Continent:',
menubutton_text variable = self.var1,
items = continentList,
menubutton_widt h = 20,
menubutton_dire ction = 'flush',
command = self._getSelect ion
)
self.method1_me nu.pack(anchor = 'w', padx = 10, pady = 10)

self.method2_me nu = Pmw.OptionMenu (parent,
labelpos = 'w',
label_text = 'Select country:',
menubutton_text variable = self.var2,
items = countryList[0],
menubutton_widt h = 20,
menubutton_dire ction = 'flush',
command = self._getSelect ion
)
self.method2_me nu.pack(anchor = 'w', padx = 10, pady = 10)

self.method3_me nu = Pmw.OptionMenu (parent,
labelpos = 'w',
label_text = 'Select state:',
menubutton_text variable = self.var3,
items = stateList[0][0],
menubutton_widt h = 20,
menubutton_dire ction = 'flush' ,
command = self._getSelect ion
)
self.method3_me nu.pack(anchor = 'w', padx = 10, pady = 10)

menus = (self.method1_m enu, self.method2_me nu, self.method3_me nu)
Pmw.alignlabels (menus)

# Create the dialog.
self.dialog = Pmw.Dialog(pare nt,
buttons = ('OK', 'Apply', 'Cancel', 'Help'),
defaultbutton = 'OK',
title = 'Select State',
command = self.execute)
self.dialog.wit hdraw()

# Add some contents to the dialog.
w = Tkinter.Label(s elf.dialog.inte rior(),
text = 'Pmw Dialog\n(put your widgets here)',
background = 'black',
foreground = 'white',
pady = 20)
w.pack(expand = 1, fill = 'both', padx = 4, pady = 4)

def showAppModal(se lf):
self.dialog.act ivate(geometry = 'centerscreenal ways')

def execute(self, result):
print 'You clicked on', result
if result not in ('Apply', 'Help'):
self.dialog.dea ctivate(result)

def _getSelection(s elf, choice):
# Can use 'self.var.get() ' instead of 'getcurselectio n()'.
print 'You have chosen %s : %s : %s' % \
(self.var1.get( ),
self.var2.get() ,
self.var3.get() )
print choice # debug
i2 = indexContinent( self.var1.get() )
self.var2.set(c ountryList[i2][0])
countryItem = countryList[i2]
#print pipelineItems # debug
self.method2_me nu.config(items = countryList)
#s3 = systemElements. indexpipe(s2,te st2)

def __call__(self):
self.dialog.sho w()

def indexContinent( name):
found = 'false'
for i in range(len(conti nentList)):
check = continentList[i]
# print 'checking %s in %s' % (name, check) # debug
if re.search(name, check):
found = 'true'
break
print found
if (found=='true') :
#print 'index of %s is %s' % (name,i) # debug
return i
else:
return -1

def indexCountry(co ntinentindex, name):
found = 'false'
for i in range(len(count ryList[continentindex])):
check = countryList[continentindex][i]
# print 'checking %s in %s' % (name, check) # debug
if re.search(name, check):
found = 'true'
break
print found
if (found=='true') :
#print 'index of %s is %s' % (name,i) # debug
return i
else:
return -1
############### ############### ############### ############### ##########

# Create selectSystem in root window for testing.
if __name__ == '__main__':
root = Tkinter.Tk()
Pmw.initialise( root)
root.title(titl e)

OKButton = Tkinter.Button( root, text = 'OK', command = root.destroy)
OKButton.pack(s ide = 'bottom')

widget = selectSystem(ro ot)
root.mainloop()