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how to use & and | in attrs
i need to make a attrs to a button when ((a = true and state = done) or (a= false and state = available)
what should i put in the button to make it works?
i tried
<button name = "button_a" string ="Button A" attrs="{'invisible':[('&',('a','=',True),('state','=','done')),('&',('a','=',False),('state','=','available'))]}"/>
and it says there is error
actually you've two errors:
1. you can't use special character & in XML directly, you should write it with it's xml code (we discussed it here)
2. conditional statement is not a valid prefix notation statement, you should write the statement in the prefix notation (we discussed it here)
correct the two errors and you're done:
<button name = "button_a" string ="Button A" attrs="{'invisible':['|','&',('a','=',True),('state','=','done'),'&',('a','=',False),('state','=','available')]}"/> 
Use the Polish notation
About your question:
(A and B) or (C and D)
should converted to the polish notation as
or and A B and C D
in your example:
['|','&',('a','=',True),('state','=','done'),'&',('a','=',False),('state','=','available')]
in xml (see @Temur post)
['|','&',('a','=',True),('state','=','done'),'&',('a','=',False),('state','=','available')]
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| Asked: 7/6/15, 4:24 AM |
| Seen: 894 times |
| Last updated: 7/7/15, 9:21 PM |