¿Qué está causando un error de "palabra no vinculada al contexto" en este script?
Pregunta
Tengo el siguiente script R3-GUI:
Rebol [
file: %context.reb
]
either exists? %r3-gui.r3 [do %r3-gui.r3][load-gui]
view [
title "First Window"
hgroup [
lab: label "fld 1 "
fld1: field "Field Data 1"
]
button "Display fld 1" on-action [if error? try [probe get-face fld1][alert "Can't read fld1"]]
button "Display fld 2" on-action [if error? try [probe get-face fld2][alert "Can't read fld2"]]
button "Open 2nd Window" on-action [
view [
title "Second Window"
hgroup [
label "fld 2" fld2: field "field 2 data"
]
button "Display fld1" on-action [if error? err: try [probe get-face fld1][probe err alert "Can't read fld1"]]
button "Display fld2" on-action [if error? err: try [probe get-face fld2][probe err alert "Can't read fld2" ]]
]
]
]
Cuando hago clic en el botón "Mostrar fld2" en la segunda ventana para acceder al contenido de fld2, aparece un ** Script error: fld2 word is not bound to a context
error.¿Cuál es la causa de esto?¿Y cómo accedo al fld2
palabra dentro de la segunda ventana?
Solución 2
El problema surge porque la función anónima que está siendo creada por el parse-layout
La función debería ser un cierre, y no lo es.Vea la diferencia en https://gist.github.com/earl/a009454787d9fe4cfaca lo que soluciona el problema.
Otros consejos
Porque FLD2 es local a una función anónima y no se limita al contexto del usuario
>> help win-face/facets/tab-face/actors
WIN-FACE/FACETS/TAB-FACE/ACTORS is a block of value: [on-action make function! [[face arg
/local fld2 err
][
view layout [
title "Second Window"
hgroup [
label "fld 2" fld2: field "field 2 data"
]
button "Display fld 1" on-action [if error? try [probe get-face fld1] [alert "Can't read fld1"]]
button "Display fld2" on-action [if error? err: try [probe get-face fld2] [probe err alert "Can't read fld2"]]
]
]]]
>>
funciona, si lo haces de esta manera
l2: layout [
title "Second Window"
hgroup [
label "fld 2" fld2: field "field 2 data"
]
button "Display fld1" on-action [if error? err: try [probe get-face fld1][probe err alert "Can't read fld1"]]
button "Display fld2" on-action [if error? err: try [probe get-face fld2][probe err alert "Can't read fld2" ]]
]
view l1: layout [
title "First Window"
hgroup [
lab: label "fld 1 "
fld1: field "Field Data 1"
]
button "Display fld 1" on-action [if error? try [probe get-face fld1][alert "Can't read fld1"]]
button "Display fld 2" on-action [if error? try [probe get-face fld2][alert "Can't read fld2"]]
button "Open 2nd Window" on-action [
view l2
]
]
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