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/usr/share/tcltk/bwidget1.9.10/progressbar.tcl is in bwidget 1.9.10-1.

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The actual contents of the file can be viewed below.

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# ----------------------------------------------------------------------------
#  progressbar.tcl
#  This file is part of Unifix BWidget Toolkit
# ----------------------------------------------------------------------------
#  Index of commands:
#     - ProgressBar::create
#     - ProgressBar::configure
#     - ProgressBar::cget
#     - ProgressBar::_destroy
#     - ProgressBar::_modify
# ----------------------------------------------------------------------------

namespace eval ProgressBar {
    Widget::define ProgressBar progressbar

    Widget::declare ProgressBar {
        {-type        Enum       normal     0
                      {normal incremental infinite nonincremental_infinite}}
        {-maximum     Int        100        0 "%d > 0"}
        {-background  TkResource ""         0 frame}
        {-foreground  TkResource "blue"     0 label}
        {-borderwidth TkResource 2          0 frame}
        {-troughcolor TkResource ""         0 scrollbar}
        {-relief      TkResource sunken     0 label}
        {-orient      Enum       horizontal 1 {horizontal vertical}}
        {-variable    String     ""         0}
        {-idle        Boolean    0          0}
        {-width       TkResource 100        0 frame}
        {-height      TkResource 4m         0 frame}
        {-bg          Synonym    -background}
        {-fg          Synonym    -foreground}
        {-bd          Synonym    -borderwidth}
    }

    Widget::addmap ProgressBar "" :cmd {-background {} -width {} -height {}}
    Widget::addmap ProgressBar "" .bar {
	-troughcolor -background -borderwidth {} -relief {}
    }

    variable _widget
}


# ----------------------------------------------------------------------------
#  Command ProgressBar::create
# ----------------------------------------------------------------------------
proc ProgressBar::create { path args } {
    variable _widget

    array set maps [list ProgressBar {} :cmd {} .bar {}]
    array set maps [Widget::parseArgs ProgressBar $args]
    eval frame $path $maps(:cmd) -class ProgressBar -bd 0 \
	    -highlightthickness 0 -relief flat
    Widget::initFromODB ProgressBar $path $maps(ProgressBar)

    set c  [eval [list canvas $path.bar] $maps(.bar) -highlightthickness 0]
    set fg [Widget::cget $path -foreground]
    if { [string equal [Widget::cget $path -orient] "horizontal"] } {
        $path.bar create rectangle -1 0 0 0 -fill $fg -outline $fg -tags rect
    } else {
        $path.bar create rectangle 0 1 0 0 -fill $fg -outline $fg -tags rect
    }

    set _widget($path,val) 0
    set _widget($path,dir) 1
    set _widget($path,var) [Widget::cget $path -variable]
    if {$_widget($path,var) != ""} {
        GlobalVar::tracevar variable $_widget($path,var) w \
		[list ProgressBar::_modify $path]
        set _widget($path,afterid) \
	    [after idle [list ProgressBar::_modify $path]]
    }

    bind $path.bar <Destroy>   [list ProgressBar::_destroy $path]
    bind $path.bar <Configure> [list ProgressBar::_modify $path]

    return [Widget::create ProgressBar $path]
}


# ----------------------------------------------------------------------------
#  Command ProgressBar::configure
# ----------------------------------------------------------------------------
proc ProgressBar::configure { path args } {
    variable _widget

    set res [Widget::configure $path $args]

    if { [Widget::hasChangedX $path -variable] } {
	set newv [Widget::cget $path -variable]
        if { $_widget($path,var) != "" } {
            GlobalVar::tracevar vdelete $_widget($path,var) w \
		    [list ProgressBar::_modify $path]
        }
        if { $newv != "" } {
            set _widget($path,var) $newv
            GlobalVar::tracevar variable $newv w \
		    [list ProgressBar::_modify $path]
	    if {![info exists _widget($path,afterid)]} {
		set _widget($path,afterid) \
		    [after idle [list ProgressBar::_modify $path]]
	    }
        } else {
            set _widget($path,var) ""
        }
    }

    foreach {cbd cor cma} [Widget::hasChangedX $path -borderwidth \
	    -orient -maximum] break

    if { $cbd || $cor || $cma } {
	if {![info exists _widget($path,afterid)]} {
	    set _widget($path,afterid) \
		[after idle [list ProgressBar::_modify $path]]
	}
    }
    if { [Widget::hasChangedX $path -foreground] } {
	set fg [Widget::cget $path -foreground]
        $path.bar itemconfigure rect -fill $fg -outline $fg
    }
    return $res
}


# ----------------------------------------------------------------------------
#  Command ProgressBar::cget
# ----------------------------------------------------------------------------
proc ProgressBar::cget { path option } {
    return [Widget::cget $path $option]
}


# ----------------------------------------------------------------------------
#  Command ProgressBar::_modify
# ----------------------------------------------------------------------------
proc ProgressBar::_modify { path args } {
    variable _widget

    catch {unset _widget($path,afterid)}
    if { ![GlobalVar::exists $_widget($path,var)] ||
	 [set val [GlobalVar::getvar $_widget($path,var)]] < 0 } {
        catch {place forget $path.bar}
    } else {
	place $path.bar -relx 0 -rely 0 -relwidth 1 -relheight 1
	set type [Widget::getoption $path -type]
	if { $val != 0 && $type != "normal" && \
		$type != "nonincremental_infinite"} {
	    set val [expr {$val+$_widget($path,val)}]
	}
	set _widget($path,val) $val
	set max [Widget::getoption $path -maximum]
	set bd  [expr {2*[$path.bar cget -bd]}]
	set w   [winfo width  $path.bar]
	set h   [winfo height $path.bar]
	if {$type == "infinite" || $type == "nonincremental_infinite"} {
	    # JDC: New infinite behaviour
	    set tval [expr {$val % $max}]
	    if { $tval < ($max / 2.0) } {
		set x0 [expr {double($tval) / double($max) * 1.5}]
	    } else {
		set x0 [expr {(1.0-(double($tval) / double($max))) * 1.5}]
	    }
	    set x1 [expr {$x0 + 0.25}]
	    # convert coords to ints to prevent triggering canvas refresh
	    # bug related to fractional coords
	    if {[Widget::getoption $path -orient] == "horizontal"} {
		$path.bar coords rect [expr {int($x0*$w)}] 0 \
		    [expr {int($x1*$w)}] $h
	    } else {
		$path.bar coords rect 0 [expr {int($h-$x0*$h)}] $w \
		    [expr {int($x1*$h)}]
	    }
	} else {
	    if { $val > $max } {set val $max}
	    if {[Widget::getoption $path -orient] == "horizontal"} {
		$path.bar coords rect -1 0 [expr {int(double($val)*$w/$max)}] $h
	    } else {
		$path.bar coords rect 0 [expr {$h+1}] $w \
		    [expr {int($h*(1.0 - double($val)/$max))}]
	    }
	}
    }
    if {![Widget::cget $path -idle]} {
	update idletasks
    }
}


# ----------------------------------------------------------------------------
#  Command ProgressBar::_destroy
# ----------------------------------------------------------------------------
proc ProgressBar::_destroy { path } {
    variable _widget

    if {[info exists _widget($path,afterid)]} {
	after cancel $_widget($path,afterid)
	unset _widget($path,afterid)
    }
    if {[info exists _widget($path,var)]} {
	if {$_widget($path,var) != ""} {
	    GlobalVar::tracevar vdelete $_widget($path,var) w \
		[list ProgressBar::_modify $path]
	}
	unset _widget($path,var)
    }
    unset _widget($path,dir)
    Widget::destroy $path
}