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　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。 . Prv8 Shell

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Current File : //usr/share/tk8.6/ttk/scrollbar.tcl

#
# Bindings for TScrollbar widget
#

# Still don't have a working ttk::scrollbar under OSX -
# Swap in a [tk::scrollbar] on that platform,
# unless user specifies -class or -style.
#
if {[tk windowingsystem] eq "aqua"} {
    rename ::ttk::scrollbar ::ttk::_scrollbar
    proc ttk::scrollbar {w args} {
	set constructor ::tk::scrollbar
	foreach {option _} $args {
	    if {$option eq "-class" || $option eq "-style"} {
		set constructor ::ttk::_scrollbar
		break
	    }
	}
	return [$constructor $w {*}$args]
    }
}

namespace eval ttk::scrollbar {
    variable State
    # State(xPress)	--
    # State(yPress)	-- initial position of mouse at start of drag.
    # State(first)	-- value of -first at start of drag.
}

bind TScrollbar <ButtonPress-1> 	{ ttk::scrollbar::Press %W %x %y }
bind TScrollbar <B1-Motion>		{ ttk::scrollbar::Drag %W %x %y }
bind TScrollbar <ButtonRelease-1>	{ ttk::scrollbar::Release %W %x %y }

bind TScrollbar <ButtonPress-2> 	{ ttk::scrollbar::Jump %W %x %y }
bind TScrollbar <B2-Motion>		{ ttk::scrollbar::Drag %W %x %y }
bind TScrollbar <ButtonRelease-2>	{ ttk::scrollbar::Release %W %x %y }

proc ttk::scrollbar::Scroll {w n units} {
    set cmd [$w cget -command]
    if {$cmd ne ""} {
	uplevel #0 $cmd scroll $n $units
    }
}

proc ttk::scrollbar::Moveto {w fraction} {
    set cmd [$w cget -command]
    if {$cmd ne ""} {
	uplevel #0 $cmd moveto $fraction
    }
}

proc ttk::scrollbar::Press {w x y} {
    variable State

    set State(xPress) $x
    set State(yPress) $y

    switch -glob -- [$w identify $x $y] {
    	*uparrow -
	*leftarrow {
	    ttk::Repeatedly Scroll $w -1 units
	}
	*downarrow -
	*rightarrow {
	    ttk::Repeatedly Scroll $w  1 units
	}
	*thumb {
	    set State(first) [lindex [$w get] 0]
	}
	*trough {
	    set f [$w fraction $x $y]
	    if {$f < [lindex [$w get] 0]} {
		# Clicked in upper/left trough
		ttk::Repeatedly Scroll $w -1 pages
	    } elseif {$f > [lindex [$w get] 1]} {
		# Clicked in lower/right trough
		ttk::Repeatedly Scroll $w 1 pages
	    } else {
		# Clicked on thumb (???)
		set State(first) [lindex [$w get] 0]
	    }
	}
    }
}

proc ttk::scrollbar::Drag {w x y} {
    variable State
    if {![info exists State(first)]} {
    	# Initial buttonpress was not on the thumb, 
	# or something screwy has happened.  In either case, ignore:
	return;
    }
    set xDelta [expr {$x - $State(xPress)}]
    set yDelta [expr {$y - $State(yPress)}]
    Moveto $w [expr {$State(first) + [$w delta $xDelta $yDelta]}]
}

proc ttk::scrollbar::Release {w x y} {
    variable State
    unset -nocomplain State(xPress) State(yPress) State(first)
    ttk::CancelRepeat
}

# scrollbar::Jump -- ButtonPress-2 binding for scrollbars.
# 	Behaves exactly like scrollbar::Press, except that
#	clicking in the trough jumps to the the selected position.
#
proc ttk::scrollbar::Jump {w x y} {
    variable State

    switch -glob -- [$w identify $x $y] {
	*thumb -
	*trough {
	    set State(first) [$w fraction $x $y]
	    Moveto $w $State(first)
	    set State(xPress) $x
	    set State(yPress) $y
	}
	default {
	    Press $w $x $y
	}
    }
}

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