gnocl::volumeButton -done

Gave the gnocl::volumeButton a little bit of TLC tonight. Added signal handlers and options for a number of inherited properties. Getting this one to work as required some trial and error as only some of the inherited options are permitted but not indicated in the docs. No, screenshot as the popup prevents this. But, here's the test script...

# the next line restarts using tclsh \
exec tclsh "$0" "$@"

package require Gnocl

set ent [gnocl::label -textVariable vol]
set vb [gnocl::volumeButton]
set box [gnocl::box]
$box add [list $vb $ent]

gnocl::window -child $box

$vb configure -value 1.0
$vb configure -onPopup {puts "popup %w"}
$vb configure -onPopdown {puts "popdown %w"}
$vb configure -onValueChanged {puts "valueChanged %w %v" ; set vol %v}
$vb configure -visible 1
$vb configure -sensitive 1
$vb configure -relief none
$vb configure -borderWidth 20
$vb configure -prelightBackgroundColor green 



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