Displaying a table of values with Gnocl table, eventBox and label widgets

WJG (03/10/16) Needed a convenient object to display a range of values and allow the user to pick an item using the mouse pointer. As items are selected, these need to be highlighted and the values passed to a specified callback procedure. Was a lot easier than expected, and less bothersome than trying to do the same job with the standard list/tree widget.

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# test_label_matrix.tcl

# the next line restarts using tclsh \
exec tclsh "$0" "[email protected]"

package require Gnocl

# create a table widget displaying list of values for single-item selection
# Args:
#        data                  the list of items to be presented in the table
#        cols                  number of columns
#        callBack        script to execure whenever item selected with mouse, 
#                                the value contained in the cell will be passed to the callback
#        bgclr                default bgclr of the table
# Returns
#        table widget id

proc lable_matrix { data cols callBack  {fgclr black} {bgclr ""}} {

        set table [gnocl::table -homogeneous 1]

                if { $bgclr eq ""} { set bgclr [$table cget -background] }

        set container [gnocl::scrolledWindow -child $table]

        set len  [llength $data]
        set rows [expr $len.0 / $cols]

        set ::tmp($table) ""
        set ::tmp($table,bgclr) $bgclr
        set ::tmp($table,fgclr) $fgclr
        set k 0 
        for {set i 0} { $i < $rows} { incr i } {
                for {set j 0} { $j < $cols} { incr j } {
                        set item [lindex $data $k]
                        set lab [gnocl::label -text $item  -align left -xPad 3]
                        set item [gnocl::eventBox -data "$callBack $item" -child $lab -background $::tmp($table,bgclr) \
                                                                -onEnter {
                                                                        %c configure -foreground red
                                                                        } \
                                                                -onLeave {
                                                                        %c configure -foreground $::tmp(%p,fgclr)
                                                                } \
                                -onButtonPress { 
                                        eval %d
                        lappend row $item
                        incr k
                $table addRow $row
                set row ""

        return $container


set data "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eget eros augue. Donec tempus odio at ante tempor, et tincidunt ex ornare. Maecenas tincidunt neque interdum lobortis lobortis. Praesent interdum cursus purus, a semper magna porta vitae. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Mauris mi massa, maximus non ipsum volutpat, porttitor cursus ipsum."

set data [string map { \{ "" \} "" ; "" . "" , "" } [lsort -dictionary $data]]

lappend data HI DI HI

set tab [lable_matrix $data 4 puts]
gnocl::window -child $tab -width 400 -height 200