operation
Factor handbook > UI framework > Implementing new gadgets > UI gestures > Operations

Next:define-operation ( pred command flags -- )


Vocabulary
ui.operations

Word description
An abstraction for an operation which may be performed on a presentation.

Operations have the following slots:
predicate - a quotation with stack effect ( obj -- ? )
command - a word
translator - a quotation with stack effect ( obj -- newobj ), or f
hook - a quotation with stack effect ( obj -- newobj ), or f
listener? - a boolean


Definition

TUPLE: operation predicate command translator listener? ;


Methods