+#---------- common to smashing and filtering ----------
+
+proc make-control {parent ctrl label ekind} {
+ debug "MAKE-CONTROL [list $parent $ctrl $label $ekind]"
+ label $parent.lab_$ctrl -text $label -justify left
+ $ekind $parent.$ctrl
+ manyset [grid size $parent] dummy row
+ incr row
+ grid configure $parent.lab_$ctrl -row $row -column 0 -sticky nw -pady 4
+ grid configure $parent.$ctrl -row $row -column 1 -sticky w -pady 3
+ return $parent.$ctrl
+}
+
+proc begin-control-grid {cw count rows inrow} {
+ if {!$inrow} { set inrow [expr {($count + $rows) / $rows}] }
+ upvar #0 control_grid_properties($cw) props
+ set props [list $rows $inrow]
+ return $cw
+}
+
+proc make-control-grid-elem {cw kind ix ekind args} {
+ upvar #0 control_grid_properties($cw) props
+ manyset $props rows inrow
+
+ set ew $cw.$ix
+
+ debug "MAKE-CONTROL-GRID-ELEM $cw $kind $ix $ekind $rows $inrow $ew"
+
+ eval [list $ekind $ew] $args
+
+ switch -exact $kind {
+ ix {
+ grid configure $ew -sticky sw \
+ -row [expr {$ix / $inrow}] \
+ -column [expr {$ix % $inrow}]
+ }
+ final {
+ grid configure $ew -sticky se \
+ -row [expr {$rows-1}] \
+ -column [expr {$inrow-1}]
+ }
+ default {
+ error "$kind ?"
+ }
+ }
+ return $ew
+}
+
+proc control-tickbox-flip {varsvn values} {
+ upvar #0 $varsvn vars
+ foreach val $values {
+ set vars($val) [expr {!$vars($val)}]
+ }
+ redraw-needed c.-tickbox-flip $varsvn $values
+}
+
+proc populate-control-grid-tickboxes {cw rows inrow varsvn values flipvalues
+ label_kind valvn default_get label_get} {
+ debug "POPULATE-CONTROL-GRID-TICKBOXES $cw $rows $inrow $varsvn\
+ [list $values] $label_kind $valvn"
+
+ upvar #0 $varsvn vars
+ upvar 1 $valvn val
+ set count [llength $values]
+
+ begin-control-grid $cw $count $rows $inrow
+
+ for {set ix 0} {$ix < $count} {incr ix} {
+ set val [lindex $values $ix]
+ set vars($val) [uplevel 1 $default_get]
+ set ew [make-control-grid-elem $cw ix $ix checkbutton \
+ -variable ${varsvn}($val) \
+ -font fixed \
+ -command [list redraw-needed c.-g.-tickbox $cw $val]]
+ $ew configure -$label_kind [uplevel 1 $label_get]
+ switch -exact $label_kind {
+ image { $ew configure -height 16 }
+ }
+ }
+ [make-control-grid-elem $cw final invert button] \
+ configure \
+ -text flip -command [list control-tickbox-flip $varsvn $flipvalues] \
+ -padx 0 -pady 0
+}
+