replying to myself:
-----------------
REBOL []
disabled-face?: func [f][flag-face? f 'disabled]
enabled-face?: func [f][not disabled-face? f]
disable-face: func [f /fx effect-block][
if not disabled-face? f [
either f/parent-face [
insert skip find f/parent-face/pane f 1 make face [
offset: f/offset
size: f/size
edge: none
either fx [effect: effect-block][effect: [merge gradmul 1x1 ]]
feel: make feel [engage: does []]
]
show f/parent-face
][
insert tail f/pane make face [
offset: 0x0
size: f/size
edge: none
either fx [effect: effect-block][effect: [merge gradmul 1x1 ]]
feel: make feel [engage: does []]
]
show f
]
flag-face f 'disabled
]
]
enable-face: func [f][
if disabled-face? f [
either f/parent-face [
remove skip find f/parent-face/pane f 1
deflag-face f 'disabled
show f/parent-face
][
remove back tail f/pane
deflag-face f 'disabled
show f
]
]
]
; test suite ....
view screen: layout [bt: button "OK" [disable-face bt wait 3
disable-face screen wait 3 enable-face bt wait 3 enable-face screen]]
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