combobox.wgt

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	#
	# NB: because of the sloppy way we are doing this,
	# we'll also let the user enter our secret command
	# directly (eg: listinsert, listdelete), but we
	# won't document that fact
	set command "list-[lindex $args 0]"
	set args [lrange $args 1 end]
    }

    set result ""

    # many of these commands are just synonyms for specific
    # commands in one of the subwidgets. We'll get them out
    # of the way first, then do the custom commands.
    switch $command {
	bbox -
	delete -
	get -
	icursor -
	index -
	insert -
	scan -
	selection -
	xview {
	    set result [eval $doWidgetCommand entry $command $args]
	}
	list-get 	{set result [eval $doWidgetCommand listbox get $args]}
	list-index 	{set result [eval $doWidgetCommand listbox index $args]}
	list-size 	{set result [eval $doWidgetCommand listbox size $args]}

	select {
	    if {[llength $args] == 1} {
		set index [lindex $args 0]
		set result [Select $widgets(this) $index]
	    } else {
		error "usage: $w select index"
	    }
	}

	subwidget {
	    set knownWidgets [list button entry listbox popup vsb]
	    if {[llength $args] == 0} {
		return $knownWidgets
	    }

	    set name [lindex $args 0]
	    if {[lsearch $knownWidgets $name] != -1} {
		set result $widgets($name)
	    } else {
		error "unknown subwidget $name"
	    }
	}

	curselection {
	    set result [eval $doWidgetCommand listbox curselection]
	}

	list-insert {
	    eval $doWidgetCommand listbox insert $args
	    set result [HandleScrollbar $w "grow"]
	}

	list-delete {
	    eval $doWidgetCommand listbox delete $args
	    set result [HandleScrollbar $w "shrink"]
	}

	toggle {
	    # ignore this command if the widget is disabled...
	    if {$options(-state) == "disabled"} return

	    # pops down the list if it is not, hides it
	    # if it is...
	    if {[winfo ismapped $widgets(popup)]} {
		set result [$widgets(this) close]
	    } else {
		set result [$widgets(this) open]
	    }
	}

	open {

	    # if this is an editable combobox2, the focus should
	    # be set to the entry widget
	    if {$options(-editable)} {
		focus $widgets(entry)
		$widgets(entry) select range 0 end
		$widgets(entry) icur end
	    }

	    # if we are disabled, we won't allow this to happen
	    if {$options(-state) == "disabled"} {
		return 0
	    }

	    # compute the geometry of the window to pop up, and set
	    # it, and force the window manager to take notice
	    # (even if it is not presently visible).
	    #
	    # this isn't strictly necessary if the window is already
	    # mapped, but we'll go ahead and set the geometry here
	    # since its harmless and *may* actually reset the geometry
	    # to something better in some weird case.
	    set geometry [::combobox2::ComputeGeometry $widgets(this)]
	    wm geometry $widgets(popup) $geometry
	    update idletasks

	    # if we are already open, there's nothing else to do
	    if {[winfo ismapped $widgets(popup)]} {
		return 0
	    }

	    # save the widget that currently has the focus; we'll restore
	    # the focus there when we're done
	    set oldFocus [focus]

	    # ok, tweak the visual appearance of things and 
	    # make the list pop up
	    $widgets(button) configure -relief sunken
	    raise $widgets(popup) [winfo parent $widgets(this)]
	    wm deiconify $widgets(popup)

	    # force focus to the entry widget so we can handle keypress
	    # events for traversal
	    focus -force $widgets(entry)

	    # select something by default, but only if its an
	    # exact match...
	    ::combobox2::Find $widgets(this) 1

	    # save the current grab state for the display containing
	    # this widget. We'll restore it when we close the dropdown
	    # list
	    set status "none"
	    set grab [grab current $widgets(this)]
	    if {$grab != ""} {set status [grab status $grab]}
	    set oldGrab [list $grab $status]
	    unset grab status

	    # *gasp* do a global grab!!! Mom always told not to
	    # do things like this, but these are desparate times.
	    grab -global $widgets(this)

	    # fake the listbox into thinking it has focus. This is 
	    # necessary to get scanning initialized properly in the
	    # listbox.
	    event generate $widgets(listbox) <B1-Enter>

	    return 1
	}

	close {
	    # if we are already closed, don't do anything...
	    if {![winfo ismapped $widgets(popup)]} {
		return 0
	    }

	    # restore the focus and grab, but ignore any errors...
	    # we're going to be paranoid and release the grab before
	    # trying to set any other grab because we really really
	    # really want to make sure the grab is released.
	    catch {focus $oldFocus} result
	    catch {grab release $widgets(this)}
	    catch {
		set status [lindex $oldGrab 1]
		if {$status == "global"} {
		    grab -global [lindex $oldGrab 0]
		} elseif {$status == "local"} {
		    grab [lindex $oldGrab 0]
		}
		unset status
	    }

	    # hides the listbox
	    $widgets(button) configure -relief raised
	    wm withdraw $widgets(popup) 

	    # select the data in the entry widget. Not sure
	    # why, other than observation seems to suggest that's
	    # what windows widgets do.
	    set editable [::combobox2::GetBoolean $options(-editable)]
	    if {$editable} {
		$widgets(entry) selection range 0 end
		$widgets(button) configure -relief raised
	    }


	    # magic tcl stuff (see tk.tcl in the distribution 
	    # lib directory)
	    tkCancelRepeat

	    return 1
	}

	cget {
	    if {[llength $args] != 1} {
		error "wrong # args: should be $w cget option"
	    }
	    set opt [::combobox2::Canonize $w option [lindex $args 0]]

	    if {$opt == "-value"} {
		set result [$widget(entry) get]
	    } else {
		set result $options($opt)
	    }
	}

	configure {
	    set result [eval ::combobox2::Configure {$w} $args]
	}

	default {
	    error "bad option \"$command\""
	}
    }

    return $result
}

# ::combobox2::Configure --
#
#    Implements the "configure" widget subcommand
#
# Arguments:
#
#    w      widget pathname
#    args   zero or more option/value pairs (or a single option)
#
# Results:
#    
#    Performs typcial "configure" type requests on the widget

proc ::combobox2::Configure {w args} {
    variable widgetOptions
    variable defaultEntryCursor

    upvar ::combobox2::${w}::widgets widgets
    upvar ::combobox2::${w}::options options

    if {[llength $args] == 0} {
	# hmmm. User must be wanting all configuration information
	# note that if the value of an array element is of length
	# one it is an alias, which needs to be handled slightly
	# differently
	set results {}
	foreach opt [lsort [array names widgetOptions]] {
	    if {[llength $widgetOptions($opt)] == 1} {
		set alias $widgetOptions($opt)
		set optName $widgetOptions($alias)
		lappend results [list $opt $optName]
	    } else {
	    	# modif by Christian Gavin 08/02/2000
	    	# if an option has been removed from the list
	    	# (e.g. -value), don't try to access it
	    	if [info exists options($opt)] {
		    set optName  [lindex $widgetOptions($opt) 0]
		    set optClass [lindex $widgetOptions($opt) 1]
		    set default [option get $w $optName $optClass]
		    lappend results [list $opt $optName $optClass \
			    $default $options($opt)]
		}
	    }
	}

	return $results
    }
    
    # one argument means we are looking for configuration
    # information on a single option
    if {[llength $args] == 1} {
	set opt [::combobox2::Canonize $w option [lindex $args 0]]

	set optName  [lindex $widgetOptions($opt) 0]
	set optClass [lindex $widgetOptions($opt) 1]
	set default [option get $w $optName $optClass]
	set results [list $opt $optName $optClass \
		$default $options($opt)]
	return $results
    }

    # if we have an odd number of values, bail. 
    if {[expr {[llength $args]%2}] == 1} {
	# hmmm. An odd number of elements in args
	error "value for \"[lindex $args end]\" missing"
    }
    
    # Great. An even number of options. Let's make sure they 
    # are all valid before we do anything. Note that Canonize
    # will generate an error if it finds a bogus option; otherwise
    # it returns the canonical option name
    foreach {name value} $args {
	set name [::combobox2::Canonize $w option $name]
	set opts($name) $value
    }

    # process all of the configuration options
    # some (actually, most) options require us to
    # do something, like change the attributes of
    # a widget or two. Here's where we do that...
    foreach option [array names opts] {
	set newValue $opts($option)
	if {[info exists options($option)]} {
	    set oldValue $options($option)
	}

	switch -- $option {
	    -background {
		$widgets(frame)   configure -background $newValue
		$widgets(entry)   configure -background $newValue
		$widgets(listbox) configure -background $newValue
		# let's keep the scrollbar good-looking
		# $widgets(vsb)     configure -background $newValue
		# $widgets(vsb)     configure -troughcolor $newValue
		set options($option) $newValue
	    }

	    -borderwidth {
		$widgets(frame) configure -borderwidth $newValue
		set options($option) $newValue
	    }

	    -command {
		# nothing else to do...
		set options($option) $newValue
	    }

	    -commandstate {
		# do some value checking...
		if {$newValue != "normal" && $newValue != "disabled"} {
		    set options($option) $oldValue
		    set message "bad state value \"$newValue\";"
		    append message " must be normal or disabled"
		    error $message
		}
		set options($option) $newValue
	    }

	    -cursor {
		$widgets(frame) configure -cursor $newValue
		$widgets(entry) configure -cursor $newValue
		$widgets(listbox) configure -cursor $newValue
		set options($option) $newValue
	    }

	    -editable {
		if {$newValue} {
		    # it's editable...
		    $widgets(entry) configure \
			    -state normal \
			    -cursor $defaultEntryCursor
		} else {
		    $widgets(entry) configure \
			    -state disabled \
			    -cursor $options(-cursor)
		}
		set options($option) $newValue
	    }

	    -font {
		$widgets(entry) configure -font $newValue
		$widgets(listbox) configure -font $newValue
		set options($option) $newValue
	    }

	    -foreground {
		$widgets(entry)   configure -foreground $newValue
		$widgets(button)  configure -foreground $newValue
		$widgets(listbox) configure -foreground $newValue
		set options($option) $newValue
	    }

	    -height {
		$widgets(listbox) configure -height $newValue
		HandleScrollbar $w
		set options($option) $newValue
	    }

	    -highlightbackground {
		$widgets(frame) configure -highlightbackground $newValue
		set options($option) $newValue
	    }

	    -highlightcolor {
		$widgets(frame) configure -highlightcolor $newValue
		set options($option) $newValue
	    }

	    -highlightthickness {
		$widgets(frame) configure -highlightthickness $newValue
		set options($option) $newValue
	    }
	    
	    -image {
		if {[string length $newValue] > 0} {
		    $widgets(button) configure -image $newValue
		} else {
		    $widgets(button) configure -image ::combobox2::bimage
		}
		set options($option) $newValue
	    }

	    -maxheight {
		# ComputeGeometry may dork with the actual height
		# of the listbox, so let's undork it
		$widgets(listbox) configure -height $options(-height)
		HandleScrollbar $w
		set options($option) $newValue
	    }

	    -relief {
		$widgets(frame) configure -relief $newValue
		set options($option) $newValue
	    }

	    -selectbackground {
		$widgets(entry) configure -selectbackground $newValue
		$widgets(listbox) configure -selectbackground $newValue
		set options($option) $newValue
	    }

	    -selectborderwidth {