Pmw optionMenu dynamic contents display?

[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','Nicaragua','Panama'],
                ['Venezuela','Colombia','Ecuador']]
stateList     = [[['BC','Alberta','Saskatchewan','others'],
                ['California','Oregon','Washington','others'],
                ['Michoacan','Oaxaca','Monterrey','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.StringVar()
        self.var2 = Tkinter.StringVar()
        self.var3 = Tkinter.StringVar()
        self.var1.set(continentItem)    # N. America
        self.var2.set(countryItem)      # Canada
        self.var3.set(stateItem)        # B.C.

        self.method1_menu = Pmw.OptionMenu(parent,
                labelpos = 'w',
                label_text = 'Select Continent:',
                menubutton_textvariable = self.var1,
                items = continentList,
                menubutton_width = 20,
                menubutton_direction = 'flush',
                command = self._getSelection
        )
        self.method1_menu.pack(anchor = 'w', padx = 10, pady = 10)

        self.method2_menu = Pmw.OptionMenu (parent,
                labelpos = 'w',
                label_text = 'Select country:',
                menubutton_textvariable = self.var2,
                items = countryList[0],
                menubutton_width = 20,
                menubutton_direction = 'flush',
                command = self._getSelection
        )
        self.method2_menu.pack(anchor = 'w', padx = 10, pady = 10)

        self.method3_menu = Pmw.OptionMenu (parent,
                labelpos = 'w',
                label_text = 'Select state:',
                menubutton_textvariable = self.var3,
                items = stateList[0][0],
                menubutton_width = 20,
                menubutton_direction = 'flush' ,
                command = self._getSelection
        )
        self.method3_menu.pack(anchor = 'w', padx = 10, pady = 10)

        menus = (self.method1_menu, self.method2_menu, self.method3_menu)
        Pmw.alignlabels(menus)

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

        # Add some contents to the dialog.
        w = Tkinter.Label(self.dialog.interior(),
            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(self):
        self.dialog.activate(geometry = 'centerscreenalways')

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

    def _getSelection(self, choice):
        # Can use 'self.var.get()' instead of 'getcurselection()'.
        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(countryList[i2][0])
        countryItem = countryList[i2]
        #print pipelineItems  # debug
        self.method2_menu.config(items = countryList)
        #s3 = systemElements.indexpipe(s2,test2)

    def __call__(self):
        self.dialog.show()

def indexContinent(name):
        found = 'false'
        for i in range(len(continentList)):
                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(continentindex, name):
        found = 'false'
        for i in range(len(countryList[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(title)

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

    widget = selectSystem(root)
    root.mainloop()