* Luc <
no@no.no>
| bind $::widget <Key-1> {set ::widget::choice $i; puts $::widget::choice}
| bind $::widget <Key-2> {set ::widget::choice $i; puts $::widget::choice}
| bind $::widget <Key-3> {set ::widget::choice $i; puts $::widget::choice}
| bind $::widget <Key-4> {set ::widget::choice $i; puts $::widget::choice}
| This works fine.
| I press 1, the app outputs 1. I press 2, the app outputs 2.
I don't believe that.
$ wish
% set widget [label .l -text "Click on me"]
% pack $widget
% focus $widget
% bind $::widget <Key-1> {set ::widget::choice $i; puts $::widget::choice}
now press "1"
=> error: so such variable: i
| foreach i {1 2 3 4 5 6 7 8 9 0} {
| bind $::widget <Key-$i> {set ::widget::choice $i; puts $::widget::choice}
| }
| I press 1, the app outputs 0. I press 2, the app outputs 0.
| I press 3, the app outputs 0.
| And so on.
You need to understand what the 'bind' command is doing: it sets up a
command to run later when the Event occurs.
Now in your case, since the command is enclosed in {}, there is no
variable substitution at the bind call.
Rather the substitution takes place later when the event occurs.
Confirm:
% bind $::widget <Key-1>
=> set ::widget::choice $i; puts $::widget::choice
% bind $::widget <Key-2>
=> set ::widget::choice $i; puts $::widget::choice
...
Note how the $i is still there in all cases, it was not replaced when
the bind was set up. Since in my test there was no variable 'i', I get
the error. In your test, the loop variable 'i' was last set to 0, so
this is what you see in all cases.
Solutions:
Check the available %-replacements for bind (most likely %K)
use 'list' to set up the binding if the variables should get resolved
when the bind is set:
bind ... "[list set ::widget::choice $i] ; puts \$::widget::choice"
for anything more substantial than a 'puts', use a helper proc to
call when the event happens:
proc some_action {key} {
switch -- $key {
1 - 2 - 3 - 4 {
puts "key $key"
}
5 {
puts "nononono!"
}
default {
puts "don't know what to do with $key"
}
}
}
foreach k {1 2 3 4 5} {
bind $widget <Key-$k> [list some_action %K]
}
# or even
bind $widget <KeyPress> [list some_action %K]
HTH
R'
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