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# Variable.tcl --
#
# Routines in this file are used to set up and operate variables
# for classes that support the -variable option
#
# Copyright (c) 1996, Expert Interface Technologies
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# tixVariable:ConfigVariable --
#
# Set up the -variable option for the object $w
#
# Side effects:
#
# data(-variable) is changed to the name of the global variable
# if the global variable exists, data(-value) takes the value of this
# variable.
# if the global variable does not exist, it is created with the
# current data(-value)
#
# Return value:
#
# true is data(-value) is changed, indicating that data(-command)
# should be invoked.
#
proc tixVariable:ConfigVariable {w arg} {
upvar #0 $w data
set changed 0
if {$data(-variable) != ""} {
uplevel #0 \
[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
}
if {$arg != ""} {
if [uplevel #0 info exists [list $arg]] {
# This global variable exists, we use its value
#
set data(-value) [uplevel #0 set [list $arg]]
set changed 1
} else {
# This global variable does not exist; let's set it
#
uplevel #0 [list set $arg $data(-value)]
}
uplevel #0 \
[list trace variable $arg w "tixVariable:TraceProc $w"]
}
return $changed
}
proc tixVariable:UpdateVariable {w} {
upvar #0 $w data
if {$data(-variable) != ""} {
uplevel #0 \
[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
uplevel #0 \
[list set $data(-variable) $data(-value)]
uplevel #0 \
[list trace variable $data(-variable) w "tixVariable:TraceProc $w"]
# just in case someone has another trace and restricted my change
#
set data(-value) [uplevel #0 set [list $data(-variable)]]
}
}
proc tixVariable:TraceProc {w name1 name2 op} {
upvar #0 $w data
set varname $data(-variable)
if [catch {$w config -value [uplevel #0 [list set $varname]]} err] {
uplevel #0 [list set $varname [list [$w cget -value]]]
error $err
}
return
}
proc tixVariable:DeleteVariable {w} {
upvar #0 $w data
# Must delete the trace command of the -variable
#
if {$data(-variable) != ""} {
uplevel #0 \
[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
}
}
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