bool<-negate

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bool<-negate

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Documentation
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  - XPCE
    - Classes
      - class bool
        
        Get methods
        
        bool<-convert
        
        bool<-negate

bool <-negate: -> bool

Maps @on to @off and visa versa. The recogniser object below will toggle the graphical->inverted:

?- new(@toggle_inverted,
       click_gesture(left, '', single,
                     message(@receiver, inverted,
                             @receiver?inverted?negate))).