Key debouncer
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#lang syndicate/actor
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;; Demonstrates debouncer-like functionality.
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(require syndicate/big-bang)
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(require/activate syndicate/big-bang/timestate)
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(struct key-down (key) #:prefab)
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(struct click-event (description) #:prefab)
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(spawn #:name 'button
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(on-start (wait-for-initial-press))
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(assert (outbound (window name 10 10 0
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(seal (overlay (text "Click me" 22 "white")
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(seal (overlay (text "Click me" 20 "white")
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(rectangle 140 50 "solid" "red")))))))
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(spawn #:name 'status
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(on (asserted (later-than (clear-time)))
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(status 'waiting))
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(assert (outbound (window 'status 10 60 0
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(seal (text (format "~a" (status)) 22 "black"))))))
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(seal (text (format "~a" (status)) 20 "black"))))))
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(spawn #:name 'key-down-listener
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(on (message (inbound (key-event $k _)))
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(react (assert (key-down k))
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(stop-when (message (inbound (release-event k _)))))))
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(spawn #:name 'key-debouncer
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(field [status 'no-key])
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(on (asserted (key-down $k))
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(react (stop-when (retracted (key-down k)))
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(stop-when-timeout 500 (status `(down ,k)))))
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(on (retracted (key-down $k))
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(react (stop-when (asserted (key-down k)))
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(stop-when-timeout 500 (status `(up ,k)))))
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(assert (outbound (window 'key-debouncer 10 90 0
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(seal (text (format "~a" (status)) 20 "black"))))))
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(module+ main
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(current-ground-dataspace
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