You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.3 KiB
Tcl
39 lines
1.3 KiB
Tcl
15 years ago
|
# postghost.tcl - Ghost a menu item at post time.
|
||
|
|
# Copyright (C) 1997 Cygnus Solutions.
|
||
|
|
# Written by Tom Tromey <tromey@cygnus.com>.
|
||
|
|
|
||
|
|
|
||
|
|
# Helper proc.
|
||
|
|
proc GHOST_helper {menu index predicate} {
|
||
|
|
if {[eval $predicate]} then {
|
||
|
|
set state normal
|
||
|
|
} else {
|
||
|
|
set state disabled
|
||
|
|
}
|
||
|
|
$menu entryconfigure $index -state $state
|
||
|
|
}
|
||
|
|
|
||
|
|
# Add a -postcommand to a menu. This is careful not to stomp other
|
||
|
|
# postcommands.
|
||
|
|
proc add_post_command {menu callback} {
|
||
|
|
set old [$menu cget -postcommand]
|
||
|
|
# We use a "\n" and not a ";" to separate so that people can put
|
||
|
|
# comments into their -postcommands without fear.
|
||
|
|
$menu configure -postcommand "$old\n$callback"
|
||
|
|
}
|
||
|
|
|
||
|
|
# Run this to make a menu item which ghosts or unghosts depending on a
|
||
|
|
# predicate that is run at menu-post time. The NO_CACHE option
|
||
|
|
# prevents the index from being looked up statically; this is useful
|
||
|
|
# if you want to use an entry name as the index and you have a very
|
||
|
|
# dynamic menu (ie one where the numeric index of a named item is not
|
||
|
|
# constant over time). If PREDICATE returns 0 at post time, then the
|
||
|
|
# item will be ghosted.
|
||
|
|
proc ghosting_menu_item {menu index predicate {no_cache 0}} {
|
||
|
|
if {! $no_cache} then {
|
||
|
|
set index [$menu index $index]
|
||
|
|
}
|
||
|
|
|
||
|
|
add_post_command $menu [list GHOST_helper $menu $index $predicate]
|
||
|
|
}
|