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if {[info exists ::scrolledframe::version]} { return }
namespace eval ::scrolledframe \
    {
# beginning of ::scrolledframe namespace definition

namespace export scrolledframe

# ==============================
#
# scrolledframe
set version 0.9.1
#
# a scrolled frame
#
# (C) 2003, ulis
#
# NOL licence (No Obligation Licence)
#
# ==============================
#
# Hacked package, no documentation, sorry
# See example at bottom
#
# ------------------------------
# v 0.9.1
# automatic scroll on resize
# ==============================

package provide Scrolledframe $version

# --------------
#
# create a scrolled frame
#
# --------------
# parm1: widget name
# parm2: options key/value list
# --------------
proc scrolledframe {w args} \
{
variable {}
# create a scrolled frame
::ttk::frame $w
# trap the reference
rename $w ::scrolledframe::_$w
# redirect to dispatch
interp alias {} $w {} ::scrolledframe::dispatch $w
# create scrollable internal frame
::ttk::frame $w.scrolled
# place it
place $w.scrolled -in $w -x 0 -y 0
# init internal data
set ($w:vheight) 0
set ($w:vwidth) 0
set ($w:vtop) 0
set ($w:vleft) 0
set ($w:xscroll) ""
set ($w:yscroll) ""
# configure
if {$args != ""} { uplevel 1 ::scrolledframe::config $w $args }
# bind <Configure>
bind $w <Configure> [namespace code [list vresize $w]]
bind $w.scrolled <Configure> [namespace code [list resize $w]]
# return widget ref
return $w
}

# --------------
#
# dispatch the trapped command
#
# --------------
# parm1: widget name
# parm2: operation
# parm2: operation args
# --------------
proc dispatch {w cmd args} \
{
variable {}
switch -glob -- $cmd \
{
con* { uplevel 1 [linsert $args 0 ::scrolledframe::config $w] }
xvi* { uplevel 1 [linsert $args 0 ::scrolledframe::xview $w] }
yvi* { uplevel 1 [linsert $args 0 ::scrolledframe::yview $w] }
getframe { return $w.scrolled }
default { uplevel 1 [linsert $args 0 ::scrolledframe::_$w $cmd] }
}
}

# --------------
# configure operation
#
# configure the widget
# --------------
# parm1: widget name
# parm2: options
# --------------
proc config {w args} \
{
variable {}
set options {}
set flag 0
foreach {key value} $args \
{
switch -glob -- $key \
{
-xsc* \
{
# new xscroll option
set ($w:xscroll) $value
set flag 1
}
-ysc* \
{
# new yscroll option
set ($w:yscroll) $value
set flag 1
}
default { lappend options $key $value }
}
}
# check if needed
if {!$flag || $options != ""} \
{
# call frame config
uplevel 1 [linsert $options 0 ::scrolledframe::_$w config]
}
}

# --------------
# resize proc
#
# resize the scrolled region
# --------------
# parm1: widget name
# --------------
proc resize {w} \
{
variable {}
# compute new height & width
set ($w:vheight) [winfo reqheight $w.scrolled]
set ($w:vwidth) [winfo reqwidth $w.scrolled]
# resize the scroll bars
vresize $w
}

# --------------
# vresize proc
#
# resize the visible part
# --------------
# parm1: widget name
# --------------
proc vresize {w} \
{
xview $w scroll 0 unit
yview $w scroll 0 unit
xset $w
yset $w
}

# --------------
# xset proc
#
# resize the visible part
# --------------
# parm1: widget name
# --------------
proc xset {w} \
{
variable {}
# call the xscroll command
set cmd $($w:xscroll)
if {$cmd != ""} { catch { eval $cmd [xview $w] } }
}

# --------------
# yset proc
#
# resize the visible part
# --------------
# parm1: widget name
# --------------
proc yset {w} \
{
variable {}
# call the yscroll command
set cmd $($w:yscroll)
if {$cmd != ""} { catch { eval $cmd [yview $w] } }
}

# -------------
# xview
#
# called on horizontal scrolling
# -------------
# parm1: widget path
# parm2: optional moveto or scroll
# parm3: fraction if parm2 == moveto, count unit if parm2 == scroll
# -------------
# return: scrolling info if parm2 is empty
# -------------

proc xview {w {cmd ""} args} \
{
variable {}
# check args
set len [llength $args]
switch -glob -- $cmd \
{
"" {}
mov* \
{ if {$len != 1} { error "wrong # args: should be \"$w xview moveto fraction\"" } }
scr* \
{ if {$len != 2} { error "wrong # args: should be \"$w xview scroll count unit\"" } }
default \
{ error "unknown operation \"$cmd\": should be empty, moveto or scroll" }
}
# save old values
set _vleft $($w:vleft)
set _vwidth $($w:vwidth)
set _width [winfo width $w]
# compute new vleft
set count ""
switch $len \
{
0 \
{
# return fractions
if {$_vwidth == 0} { return {0 1} }
set first [expr {double($_vleft) / $_vwidth}]
set last [expr {double($_vleft + $_width) / $_vwidth}]
if {$last > 1.0} { return {0 1} }
return [list [format %g $first] [format %g $last]]
}
1 \
{
# absolute movement
set vleft [expr {int(double($args) * $_vwidth)}]
}
2 \
{
# relative movement
foreach {count unit} $args break
if {[string match p* $unit]} { set count [expr {$count * 9}] }
set vleft [expr {$_vleft + $count * 0.1 * $_width}]
}
}
if {$vleft + $_width > $_vwidth} { set vleft [expr {$_vwidth - $_width}] }
if {$vleft < 0} { set vleft 0 }
if {$vleft != $_vleft || $count == 0} \
{
set ($w:vleft) $vleft
xset $w
place $w.scrolled -in $w -relx 0 -rely 0 -x [expr {-$vleft}]
}
}

# -------------
# yview
#
# called on vertical scrolling
# -------------
# parm1: widget path
# parm2: optional moveto or scroll
# parm3: fraction if parm2 == moveto, count unit if parm2 == scroll
# -------------
# return: scrolling info if parm2 is empty
# -------------

proc yview {w {cmd ""} args} \
{
variable {}
# check args
set len [llength $args]
switch -glob -- $cmd \
{
"" {}
mov* \
{ if {$len != 1} { error "wrong # args: should be \"$w yview moveto fraction\"" } }
scr* \
{ if {$len != 2} { error "wrong # args: should be \"$w yview scroll count unit\"" } }
default \
{ error "unknown operation \"$cmd\": should be empty, moveto or scroll" }
}
# save old values
set _vtop $($w:vtop)
set _vheight $($w:vheight)
set _height [winfo height $w]
# compute new vtop
set count ""
switch $len \
{
0 \
{
# return fractions
if {$_vheight == 0} { return {0 1} }
set first [expr {double($_vtop) / $_vheight}]
if {$first < 0.0} { set first 0.0 }
set last [expr {double($_vtop + $_height) / $_vheight}]
if {$last > 1.0} { set last 1.0 }
return [list [format %g $first] [format %g $last]]
}
1 \
{
# absolute movement
set vtop [expr {int(double($args) * $_vheight)}]
}
2 \
{
# relative movement
foreach {count unit} $args break
if {[string match p* $unit]} { set count [expr {$count * 9}] }
set vtop [expr {$_vtop + $count * 0.1 * $_height}]
}
}
if {$vtop + $_height > $_vheight} { set vtop [expr {$_vheight - $_height}] }
if {$vtop < 0} { set vtop 0 }
if {$vtop != $_vtop || $count == 0} \
{
set ($w:vtop) $vtop
yset $w
place $w.scrolled -in $w -y [expr {-$vtop}]
}
}

# end of ::scrolledframe namespace definition
    }
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