Disabling Comboboxes

[kapil2000 at my-deja.com]

Hey,

It worked great.  I basically had the same thing, except I messed up
some bindings...=P

Thanks!!

Kapil

In article <16ef54c0.7dd47049 at usw-ex0105-035.remarq.com>,
  Richard Chamberlain <richard_chamberlainNOriSPAM at ntlworld.com.invalid>
wrote:
> Hi Kapil,
>
> In the ToDo list for Pmw disabling is mentioned so hopefully
> we'll have a solution from the source before long. In the
> meantime...
>
> This is a bit of hack (in the derogatory sense of the word) but
> hey!
>
> So you basically want to import the myComboBox class and create
> an instance just as you would with Pmw. I've added a couple of
> methods - disable and enable suprisingly enough.
>
> Included below is some test code.
>
> It works in the same way as you mentioned, by unbinding the
> events, and rebinding them to enable it.
>
> Richard
>
> from Tkinter import *
> import Pmw
> root = Tk()
> root.title('Disabling ComboBox Hack')
> Pmw.initialise()
>
> class myComboBox(Pmw.ComboBox):
>     def disable(self):
>         # Rebind things to my empty handler
>         self.component('arrowbutton').bind('<1>',self.handler)
>         self.component('arrowbutton').bind('<3>',self.handler)
>         self.component('arrowbutton').bind('<Shift-
> 3>',self.handler)
>         self.component('entryfield_entry').configure
> (state='disabled',fg='grey')
>
>     def enable(self):
>         # bind the events back up to the original methods
>         self.component('arrowbutton').bind('<1>',self._postList)
>         self.component('arrowbutton').bind('<3>',self._next)
>         self.component('arrowbutton').bind('<Shift-3>',
> self._previous)
>         self.component('arrowbutton').configure(takefocus=1)
>         self.component('entryfield_entry').configure
> (state='normal',fg='black')
>
>     def handler(self,event):
>         # so it doesn't propagate the event
>         return('break')
>
> # Now test it
>
> comboentries = ("Pmw Should", "have a nicer way", "to
> disable", "a combo box")
> theEnabler = Button(root, text='Enabled',padx=20, pady=10)
> theEnabler.pack(expand=1, fill=BOTH, padx=8, pady=8)
>
> combobox = myComboBox(root, label_text='Disabling Combobox:',
> labelpos='wn',
>                         listbox_width=24, dropdown=1,
>                         scrolledlist_items=comboentries)
> combobox.pack(fill=BOTH, expand=1, padx=8, pady=8)
>
> combobox.selectitem(comboentries[0])
>
> def disable(event):
>     if theEnabler['text']=='Enabled':
>         combobox.disable()
>         theEnabler.configure(text='Disabled')
>     else:
>         combobox.enable()
>         theEnabler.configure(text='Enabled')
> theEnabler.bind('<Button-1>',disable)
> root.mainloop()
>
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>


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