102 lines
2.5 KiB
Tcl
102 lines
2.5 KiB
Tcl
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# -*- mode: TCL; fill-column: 75; tab-width: 8; coding: iso-latin-1-unix -*-
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#
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# $Id: Variable.tcl,v 1.4 2001/12/09 05:04:02 idiscovery Exp $
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#
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# Variable.tcl --
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#
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# Routines in this file are used to set up and operate variables
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# for classes that support the -variable option
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#
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# Copyright (c) 1993-1999 Ioi Kim Lam.
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# Copyright (c) 2000-2001 Tix Project Group.
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#
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# See the file "license.terms" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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#
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# tixVariable:ConfigVariable --
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#
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# Set up the -variable option for the object $w
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#
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# Side effects:
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#
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# data(-variable) is changed to the name of the global variable
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# if the global variable exists, data(-value) takes the value of this
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# variable.
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# if the global variable does not exist, it is created with the
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# current data(-value)
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#
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# Return value:
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#
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# true is data(-value) is changed, indicating that data(-command)
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# should be invoked.
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#
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proc tixVariable:ConfigVariable {w arg} {
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upvar #0 $w data
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set changed 0
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if {$data(-variable) != ""} {
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uplevel #0 \
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[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
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}
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if {$arg != ""} {
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if {[uplevel #0 info exists [list $arg]]} {
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# This global variable exists, we use its value
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#
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set data(-value) [uplevel #0 set [list $arg]]
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set changed 1
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} else {
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# This global variable does not exist; let's set it
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#
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uplevel #0 [list set $arg $data(-value)]
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}
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uplevel #0 \
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[list trace variable $arg w "tixVariable:TraceProc $w"]
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}
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return $changed
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}
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proc tixVariable:UpdateVariable {w} {
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upvar #0 $w data
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if {$data(-variable) != ""} {
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uplevel #0 \
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[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
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uplevel #0 \
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[list set $data(-variable) $data(-value)]
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uplevel #0 \
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[list trace variable $data(-variable) w "tixVariable:TraceProc $w"]
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# just in case someone has another trace and restricted my change
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#
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set data(-value) [uplevel #0 set [list $data(-variable)]]
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}
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}
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proc tixVariable:TraceProc {w name1 name2 op} {
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upvar #0 $w data
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set varname $data(-variable)
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if {[catch {$w config -value [uplevel #0 [list set $varname]]} err]} {
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uplevel #0 [list set $varname [list [$w cget -value]]]
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error $err
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}
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return
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}
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proc tixVariable:DeleteVariable {w} {
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upvar #0 $w data
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# Must delete the trace command of the -variable
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#
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if {$data(-variable) != ""} {
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uplevel #0 \
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[list trace vdelete $data(-variable) w "tixVariable:TraceProc $w"]
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}
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}
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