晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Directory :  /usr/share/tk8.6/demos/

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Current File : //usr/share/tk8.6/demos/check.tcl
# check.tcl --
#
# This demonstration script creates a toplevel window containing
# several checkbuttons.

if {![info exists widgetDemo]} {
    error "This script should be run from the \"widget\" demo."
}

package require Tk

set w .check
catch {destroy $w}
toplevel $w
wm title $w "Checkbutton Demonstration"
wm iconname $w "check"
positionWindow $w

label $w.msg -font $font -wraplength 4i -justify left -text "Four checkbuttons are displayed below.  If you click on a button, it will toggle the button's selection state and set a Tcl variable to a value indicating the state of the checkbutton.  The first button also follows the state of the other three.  If only some of the three are checked, the first button will display the tri-state mode. Click the \"See Variables\" button to see the current values of the variables."
pack $w.msg -side top

## See Code / Dismiss buttons
set btns [addSeeDismiss $w.buttons $w [list safety wipers brakes sober]]
pack $btns -side bottom -fill x

checkbutton $w.b0 -text "Safety Check" -variable safety -relief flat \
    -onvalue "all" \
    -offvalue "none" \
    -tristatevalue "partial"
checkbutton $w.b1 -text "Wipers OK" -variable wipers -relief flat
checkbutton $w.b2 -text "Brakes OK" -variable brakes -relief flat
checkbutton $w.b3 -text "Driver Sober" -variable sober -relief flat
pack $w.b0 -side top -pady 2 -anchor w
pack $w.b1 $w.b2 $w.b3 -side top -pady 2 -anchor w -padx 15

## This code makes $w.b0 function as a tri-state button; it's not
## needed at all for just straight yes/no buttons.

set in_check 0
proc tristate_check {n1 n2 op} {
    global safety wipers brakes sober in_check
    if {$in_check} {
	return
    }
    set in_check 1
    if {$n1 eq "safety"} {
	if {$safety eq "none"} {
	    set wipers 0
	    set brakes 0
	    set sober 0
	} elseif {$safety eq "all"} {
	    set wipers 1
	    set brakes 1
	    set sober 1
	}
    } else {
	if {$wipers == 1 && $brakes == 1 && $sober == 1} {
	    set safety all
	} elseif {$wipers == 1 || $brakes == 1 || $sober == 1} {
	    set safety partial
	} else {
	    set safety none
	}
    }
    set in_check 0
}

trace variable wipers w tristate_check
trace variable brakes w tristate_check
trace variable sober  w tristate_check
trace variable safety w tristate_check

haha - 2025