Problems With Conditional Actions When Using Screens [Solved

[DerWille]

So, I'm still plowing along with a character creation screen and I'm coming to a problem. How can I make the action of a button be conditional? For example, let's imagine Protag-kun is deciding how much strength his life has given him up to this point.

He has 20 attribute points to distribute amongst his stats. No stat can be lower than 5 and no higher than 20. How do I go about programming this in the screen itself, so the buttons disable themselves or stop working once they've hit the right conditions?

Right now, this is my code with all of my experimentation removed:

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screen characterCreation:

    grid 4 1:
        text "Strength" xalign 0.1 yalign 0.10
        text "[Protag.Strength]" xalign 0.15 yalign .10
        
        textbutton "-" xalign 0.17 yalign .10:
            action[ SetField( Protag, "Strength", Protag.Strength-1 ), SetField( Protag, "attributePoints", Protag.attributePoints+1) ]
                
        textbutton "+" xalign 0.19 yalign.10:
            action[ SetField( Protag, "Strength", Protag.Strength+1 ), SetField( Protag, "attributePoints", Protag.attributePoints-1 ) ]
            
    text "Attribute Points" xalign 0.0 yalign 0.30
    text "[Protag.attributePoints]" xalign 0.25 yalign 0.30

One of the experiments I tried was using this: http://www.renpy.org/doc/html/screen_actions.html#If But when I used it, I received the error, "Textbutton has no 'If' child." So I tried the other if, with a lowercase i and the same error occurred.

Another experiment was instead of trying to do all of this on the screen, I'd call a function every time a button was pressed. That however caused the buttons to completely deactivate.

Does anyone have any ideas on how to do this or is the impossible kicking me to the curb?

[Alex]

Try

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action if (  (Protag.Strength < 20 and Protag.attributePoints >0), true = [SetField( Protag, "Strength", Protag.Strength+1 ), SetField( Protag, "attributePoints", Protag.attributePoints-1 ) ], false = None )

(not tested)

[DerWille]

Thanks for the reply. I tried it out, Ren'Py doesn't run and this pops up:

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I'm sorry, but an uncaught exception occurred.

After loading the script.
KeyError: u'SetField( Protag, "Strength", Protag'

I removed one of the actions from the list and ran it. Ren'Py does run, but I got this error:

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expected 'simple_expression' not found.
action -> if( ( Protag.Strength > 5 and Protag.attributePoints < 20 ), true = SetField( Protag, "Strength", Protag.Strength-1, false = None )

Two different errors depending on the number of actions given.

[backansi]

'action if' should be 'action If' .

[DerWille]

Good eye. Works like a charm. Thanks for helping me.