I am writing a DrRacket plugin and want to react to tab changes. I am
augmenting the on-tab-change method, as shown below, but this augmentation
is not being invoked when tabs are changed.
Is there anything obviously wrong with this approach ?
I looked through the Racket source and noticed that the optimization coach
does not call (inner (void) on-tab-change from-tab to-tab) in its
(define/augment (on-tab-change from-tab to-tab)... - but changing the
before? argument for my extension to #t does not make a difference, so that
may be a red-herring.
#lang racket/gui
(require drracket/tool)
(provide tool@)
(define tool@
(unit
(import drracket:tool^)
(export drracket:tool-exports^)
(define (phase1) (void))
(define (phase2) (drracket:get/extend:extend-unit-frame frame-mixin) #f)
(define frame-mixin
(mixin (drracket:unit:frame<%>) (drracket:unit:frame<%>)
(define/augment (on-tab-change from-tab to-tab)
(inner (void) on-tab-change from-tab to-tab)
(printf "TAB-CHANGE\n"))
(printf "AUGMENTED !\n") ;sanity check
(super-new)))))
--Nick
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