# git-gui status bar mega-widget
# Copyright (C) 2007 Shawn Pearce

class status_bar {

field w         ; # our own window path
field w_l       ; # text widget we draw messages into
field w_c       ; # canvas we draw a progress bar into
field status  {}; # single line of text we show
field prefix  {}; # text we format into status
field units   {}; # unit of progress

constructor new {path} {
        set w $path
        set w_l $w.l
        set w_c $w.c

        frame $w \
                -borderwidth 1 \
                -relief sunken
        label $w_l \
                -textvariable @status \
                -anchor w \
                -justify left
        pack $w_l -side left

        bind $w <Destroy> [cb _delete %W]
        return $this
}

method start {msg uds} {
        if {[winfo exists $w_c]} {
                $w_c coords bar 0 0 0 20
        } else {
                canvas $w_c \
                        -width 100 \
                        -height [expr {int([winfo reqheight $w_l] * 0.6)}] \
                        -borderwidth 1 \
                        -relief groove \
                        -highlightt 0
                $w_c create rectangle 0 0 0 20 -tags bar -fill navy
                pack $w_c -side right
        }

        set status $msg
        set prefix $msg
        set units  $uds
}

method update {have total} {
        set pdone 0
        if {$total > 0} {
                set pdone [expr {100 * $have / $total}]
        }

        set status [format "%s ... %i of %i %s (%2i%%)" \
                $prefix $have $total $units $pdone]
        $w_c coords bar 0 0 $pdone 20
}

method stop {msg} {
        destroy $w_c
        set status $msg
}

method show {msg} {
        set status $msg
}

method _delete {current} {
        if {$current eq $w} {
                delete_this
        }
}

}