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# Tix Demostration Program

#

# This sample program is structured in such a way so that it can be

# executed from the Tix demo program "widget": it must have a

# procedure called "RunSample". It should also have the "if" statment

# at the end of this file so that it can be run as a standalone

# program using tixwish.

# This program demonstrates the use of the tixMeter widget -- it is

# used to display the progress of a background job

#

proc RunSample {w} {

    set top [frame $w.f -bd 1 -relief raised]

    set box [tixButtonBox $w.b -bd 1 -relief raised]

    pack $box -side bottom -fill both

    pack $top -side top -fill both -expand yes

    # Create the Meter and the Label

    #

    label $top.lab -text "Work in progress ...."

    tixMeter $top.met -value 0 -text 0%

    pack $top.lab -side top -padx 50 -pady 10 -anchor c

    pack $top.met -side top -padx 50 -pady 10 -anchor c

    # Create the buttons

    #

    $box add cancel  -text Cancel  -command "destroy $w" \

        -width 6 -under 0

    $box add restart -text Restart -width 6 -under 0

    $box subwidget restart config -command \

        "Meter:Start $top.met [$box subwidget cancel] [$box subwidget restart]"

    $box subwidget restart invoke

}

proc Meter:Start {meter cancel restart} {

    $restart config -state disabled

    $cancel config -text Cancel

    after 40 Meter:BackgroundJob $meter 0 $cancel $restart

}

proc Meter:BackgroundJob {meter progress cancel restart} {

    if ![winfo exists $meter] {

        # the window has already been destroyed 

        #

        return

    }

    set progress [expr $progress + 0.02]

    set text [expr int($progress*100.0)]%

    $meter config -value $progress -text $text

    if {$progress < 1.0} {

        after 40 Meter:BackgroundJob $meter $progress $cancel $restart

    } else {

        $cancel config -text OK -under 0

        $restart config -state normal

    }

}

if {![info exists tix_demo_running]} {

    wm withdraw .

    set w .demo

    toplevel $w

    RunSample $w

    bind $w <Destroy> exit

}