A scrolled frame

BWidgets has a scrollableframe widget to fill this gap left by tcl/tk (even as new as 8.6). Tk demo suggested to embed widgets into the scrollable text widget. In case you favor neither of them, here is a scrollableframe widget not depending on BWidget.

ulis, 2003-06-28: A hacked package to scroll a frame in pure Tcl/Tk.

2003-11-07, v 0.9.1: automatic scroll on resize.

ulis, 24-10-2005: see at the bottom the KJN optimized & enhanced version.

http://wfr.tcl.tk/fichiers/ulis/ScrolledFrame.gif

download: https://wiki.tcl-lang.org/_repo/ulis/Scrolledframe.zip

[Anyone up for explaining how it works? Seems like it uses place…]


The package

  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
      frame $w
      # trap the reference
      rename $w ::scrolledframe::_$w
      # redirect to dispatch
      interp alias {} $w {} ::scrolledframe::dispatch $w
      # create scrollable internal frame
      frame $w.scrolled -highlightt 0 -padx 0 -pady 0
      # 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] }
        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 $first $last]
        }
        1       \
        { 
          # absolute movement
          set vleft [expr {int(double($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 < 0} { set vleft 0 }
      if {$vleft + $_width > $_vwidth} { set vleft [expr {$_vwidth - $_width}] }
      if {$vleft != $_vleft || $count == 0} \
      {
        set ($w:vleft) $vleft
        xset $w
        place $w.scrolled -in $w -x [expr {-$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) / $_vheight}]
          set last [expr {double($_vtop + $_height) / $_vheight}]
          if {$last > 1.0} { return {0 1} }
          return [list $first $last]
        }
        1       \
        { 
          # absolute movement
          set vtop [expr {int(double($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 < 0} { set vtop 0 }
      if {$vtop + $_height > $_vheight} { set vtop [expr {$_vheight - $_height}] }
      if {$vtop != $_vtop || $count == 0} \
      {
        set ($w:vtop) $vtop
        yset $w
        place $w.scrolled -in $w -y [expr {-$vtop}]
        puts "place $w.scrolled -in $w -y [expr {-$vtop}]"
      }
    }

  # end of ::scrolledframe namespace definition
  }

The demo

  # ==============================
  #
  # demo
  #
  # ==============================

    if {[catch {package require Scrolledframe}]} \
    {
      source [file join [file dirname [info script]] scrolledframe.tcl]
      package require Scrolledframe
    }
    namespace import ::scrolledframe::scrolledframe
    scrolledframe .sf -height 150 -width 100 \
        -xscroll {.hs set} -yscroll {.vs set}
    scrollbar .vs -command {.sf yview}
    scrollbar .hs -command {.sf xview} -orient horizontal
    grid .sf -row 0 -column 0 -sticky nsew
    grid .vs -row 0 -column 1 -sticky ns
    grid .hs -row 1 -column 0 -sticky ew
    grid rowconfigure . 0 -weight 1
    grid columnconfigure . 0 -weight 1
    set f .sf.scrolled
    foreach i {0 1 2 3 4 5 6 7 8 9} \
    { 
      label $f.l$i -text "Hi! I'm the scrolled label $i" -relief groove
      pack $f.l$i -padx 10 -pady 2
    }

Another demo

  # packages
  source ../Scrolledframe/scrolledframe.tcl
  namespace import ::scrolledframe::scrolledframe
  package require Tk
  # create widgets
  set bd 2
  set bd2 [expr {$bd * 2}]
  frame .f0 -bd 1 -relief groove
  frame .f1
  button .f1._A4 -text A4 -width 10 -command {size A4}
  button .f1._A3 -text A3 -width 10 -command {size A3}
  pack .f1._A4 .f1._A3 -padx 10 -pady 10 -side left
  scrolledframe .f2 -xscrollc {.hs set} -yscrollc {.vs set}
  canvas .f2.scrolled.c -bd 1 -relief ridge \
      -highlightt 0 -bg beige
  .f2.scrolled.c create text 0 0 -tags size
  pack .f2.scrolled.c
  scrollbar .vs -command {.f2 yview}
  scrollbar .hs -command {.f2 xview} -orient horizontal
  # place widgets
  grid .f0 -row 1 -column 0 -sticky nsew
  grid .f1 -row 0 -column 0 -columnspan 2
  grid .f2 -row 1 -column 0
  grid .vs -row 1 -column 1 -sticky ns
  grid .hs -row 2 -column 0 -sticky ew
  grid rowconfigure . 1 -weight 1
  grid columnconfigure . 0 -weight 1
  wm geometry . 300x400
  # sizing the canvas
  proc size {size} \
  { 
    switch $size \
    {
      A3    { set width 297; set height 420 }
      A4    { set width 210; set height 297 }
    }
    set c .f2.scrolled.c
    $c config -width $width -height $height 
    set bd [$c cget -bd]
    set bd*2 [expr {$bd * 2}]
    .f2 config -width [incr width ${bd*2}] -height [incr height ${bd*2}]
    $c coords size [expr {$width / 2}] [expr {$height / 2}]
    $c itemconfig size -text $size
  }
  # init
  size A4

See also


Wrapper

Roalt, June 30th, 2003

To use the scrolledframe without thinking about adding scrollbars, use the following wrapper to replace your "set f [frame .f]" call by a "set f [scrollframe .f]" call:

ulis, 2003-06-30: When using the wrapper, be aware to only use the grid geometry manager inside the parent of the frame. This because the wrapper uses it and that geometry managers can't be mixed.


  # function to wrap the scrolledframe package
  proc scrollframe { fname args } {
    
    set parent [eval frame $fname $args]

    scrolledframe $parent.sf \
        -xscroll "$parent.hs set" -yscroll "$parent.vs set"
    scrollbar $parent.vs -command "$parent.sf yview"
    scrollbar $parent.hs -command "$parent.sf xview" -orient horizontal
    grid $parent.sf -row 0 -column 0 -sticky nsew
    grid $parent.vs -row 0 -column 1 -sticky ns
    grid $parent.hs -row 1 -column 0 -sticky ew
    grid rowconfigure $parent 0 -weight 1
    grid columnconfigure $parent 0 -weight 1
    return $parent.sf.scrolled
  }

A fully wrapped example that also passes the arguments to the scrolled internal frame.

 proc Scrolled_Frame { fname args } {
    set parent [eval frame $fname $args]
    scrolledframe $parent.sf -xscroll [list $parent.hs set] -yscroll [list $parent.vs set]
    foreach {arg1 arg2} $args {
        $parent.sf.scrolled configure $arg1 $arg2
    }
    scrollbar $parent.vs -command [list $parent.sf yview] -orient vertical
    scrollbar $parent.hs -command [list $parent.sf xview] -orient horizontal
    grid $parent.sf -row 0 -column 0 -sticky news
    grid $parent.vs -row 0 -column 1 -sticky ns
    grid $parent.hs -row 1 -column 0 -sticky ew
    grid rowconfigure $parent 0 -weight 1
    grid columnconfigure $parent 0 -weight 1
    return $parent.sf.scrolled
 }
 set blah [Scrolled_Frame .sf -bg #ffffff -relief sunken -bd 50]
 set blah2 [Scrolled_Frame .sf2]
 set blah3 [Scrolled_Frame .sf3 -bg #666666 -relief groove -bd 2]
 set x 0
 while {$x < 100} {
    label $blah.$x -text "This is a Scrolled Frame."
    grid $blah.$x -row $x -column $x -sticky news
    label $blah2.$x -text "This is also a Scrolled Frame."
    grid $blah2.$x -row $x -column $x -sticky news
    label $blah3.$x -text "You guessed it."
    grid $blah3.$x -row $x -column $x -sticky news
    incr x
 }
 pack .sf -fill both -expand true
 pack .sf2 -fill both -expand true
 pack .sf3 -fill both -expand true

The KJN optimized & enhanced version

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

    package require Tk 8.4
    namespace export scrolledframe

  # ==============================
  #
  # scrolledframe
  set version 0.9.1
  set (debug,place) 0
  #
  # a scrolled frame
  #
  # (C) 2003, ulis
  #
  # NOL licence (No Obligation Licence)
  #
  # Changes (C) 2004, KJN
  #
  # 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
      frame $w
      # trap the reference
      rename $w ::scrolledframe::_$w
      # redirect to dispatch
      interp alias {} $w {} ::scrolledframe::dispatch $w
      # create scrollable internal frame
      frame $w.scrolled -highlightt 0 -padx 0 -pady 0
      # place it
      place $w.scrolled -in $w -x 0 -y 0
      if {$(debug,place)} { puts "place $w.scrolled -in $w -x 0 -y 0" } ;#DEBUG
      # init internal data
      set ($w:vheight) 0
      set ($w:vwidth) 0
      set ($w:vtop) 0
      set ($w:vleft) 0
      set ($w:xscroll) ""
      set ($w:yscroll) ""
      set ($w:width)    0
      set ($w:height)   0
      set ($w:fillx)    0
      set ($w:filly)    0
      # configure
      if {$args != ""} { uplevel 1 ::scrolledframe::config $w $args }
      # bind <Configure>
      bind $w <Configure> [namespace code [list resize $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] }
        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 -- $key \
        {
          -fill   \
          {
            # new fill option: what should the scrolled object do if it is smaller than the viewing window?
            if {$value == "none"} {
               set ($w:fillx) 0
               set ($w:filly) 0
            } elseif {$value == "x"} {
               set ($w:fillx) 1
               set ($w:filly) 0
            } elseif {$value == "y"} {
               set ($w:fillx) 0
               set ($w:filly) 1
            } elseif {$value == "both"} {
               set ($w:fillx) 1
               set ($w:filly) 1
            } else {
               error "invalid value: should be \"$w configure -fill value\", where \"value\" is \"x\", \"y\", \"none\", or \"both\""
            }
            resize $w force
            set flag 1
          }
          -xsc*   \
          {
            # new xscroll option
            set ($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
    #
    # Update the scrollbars if necessary, in response to a change in either the viewing window
    # or the scrolled object. 
    # Replaces the old resize and the old vresize
    # A <Configure> call may mean any change to the viewing window or the scrolled object.
    # We only need to resize the scrollbars if the size of one of these objects has changed.
    # Usually the window sizes have not changed, and so the proc will not resize the scrollbars.
    # --------------
    # parm1: widget name
    # parm2: pass anything to force resize even if dimensions are unchanged
    # --------------
    proc resize {w args} \
    {
      variable {}
      set force [llength $args]

      set _vheight     $($w:vheight)
      set _vwidth      $($w:vwidth)
      # compute new height & width
      set ($w:vheight) [winfo reqheight $w.scrolled]
      set ($w:vwidth)  [winfo reqwidth  $w.scrolled]

      # The size may have changed, e.g. by manual resizing of the window
      set _height     $($w:height)
      set _width      $($w:width)
      set ($w:height) [winfo height $w] ;# gives the actual height of the viewing window
      set ($w:width)  [winfo width  $w] ;# gives the actual width of the viewing window


      if {$force || $($w:vheight) != $_vheight || $($w:height) != $_height} {
        # resize the vertical scroll bar
        yview $w scroll 0 unit
        # yset $w
      }

      if {$force || $($w:vwidth) != $_vwidth || $($w:width) != $_width} {
        # resize the horizontal scroll bar
        xview $w scroll 0 unit
        # xset $w
      }
    } ;# end proc resize


    # --------------
    # 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 -- $cmd \
      {
        ""      {set args {}}
        mov*    \
        { if {$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  $($w:width)
      # 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 $first $last]
        }
        1       \
        {
          # absolute movement
          set vleft [expr {int(double($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 $w
        if {$($w:fillx) && ($_vwidth < $_width || $($w:xscroll) == "") } {
          # "scrolled object" is not scrolled, because it is too small or because no scrollbar was requested
          # fillx means that, in these cases, we must tell the object what its width should be
          place $w.scrolled -in $w -x [expr {-$vleft}] -width $_width
          if {$(debug,place)} { puts "place $w.scrolled -in $w -x [expr {-$vleft}] -width $_width" } ;#DEBUG
        } else {
          place $w.scrolled -in $w -x [expr {-$vleft}] -width {}
          if {$(debug,place)} { puts "place $w.scrolled -in $w -x [expr {-$vleft}] -width {}" } ;#DEBUG
        }

      }
    }

    # -------------
    # 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 -- $cmd \
      {
        ""      {set args {}}
        mov*    \
        { if {$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]
      set _height $($w:height)
      # compute new vtop
      set count ""
      switch $len \
      {
        0       \
        {
          # return fractions
          if {$_vheight == 0} { return {0 1} }
          set first [expr {double($_vtop) / $_vheight}]
          set last [expr {double($_vtop + $_height) / $_vheight}]
          if {$last > 1.0} { return {0 1} }
          return [list $first $last]
        }
        1       \
        {
          # absolute movement
          set vtop [expr {int(double($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 $w
        if {$($w:filly) && ($_vheight < $_height || $($w:yscroll) == "")} {
          # "scrolled object" is not scrolled, because it is too small or because no scrollbar was requested
          # filly means that, in these cases, we must tell the object what its height should be
          place $w.scrolled -in $w -y [expr {-$vtop}] -height $_height
          if {$(debug,place)} { puts "place $w.scrolled -in $w -y [expr {-$vtop}] -height $_height" } ;#DEBUG
        } else {
          place $w.scrolled -in $w -y [expr {-$vtop}] -height {}
          if {$(debug,place)} { puts "place $w.scrolled -in $w -y [expr {-$vtop}] -height {}" } ;#DEBUG
        }
      }
    }

  # end of ::scrolledframe namespace definition
  }

The KJN demo

  # ==============================
  #
  # demo
  #
  # ==============================

    if {[catch {package require Scrolledframe}]} \
    {
      source [file join [file dirname [info script]] sf9223.2.tcl]
      package require Scrolledframe
    }
    namespace import ::scrolledframe::scrolledframe

    scrolledframe .sf -height 150 -width 100 \
        -xscrollcommand {.hs set} -yscrollcommand {.vs set}  -fill both ;# try both, x, y or none
    scrollbar .vs -command {.sf yview}
    scrollbar .hs -command {.sf xview} -orient horizontal
    grid .sf -row 0 -column 0 -sticky nsew
    grid .vs -row 0 -column 1 -sticky ns
    grid .hs -row 1 -column 0 -sticky ew
    grid rowconfigure . 0 -weight 1
    grid columnconfigure . 0 -weight 1
    set f .sf.scrolled
  #  .sf configure -bg white

    foreach i {0 1 2 3 4 5 6 7 8 9} \
    {
      label $f.l$i -text "Hi! I'm the scrolled label $i" -relief groove
      pack $f.l$i -padx 10 -pady 2 -anchor nw -fill x
    }
    label $f.lf -text "Hi! I take up the slack!" -relief groove
    pack  $f.lf -in $f -padx 10 -pady 2 -anchor nw -fill both -expand 1

So, how about some examples of using the above package and proc?

For instance, above, under the screenshot, how about showing the code which created it?

ulis: see The demo & Another demo

ZB Used this scrollable frame in Tkamixer

Will this code be going into tklib?

YS 2011-03-04: Removed using of format, as it can lead to rare, but serious bug because of rounding: scrollbar begins to jump back and forth (infinite loop).

AMG: A [see] subcommand would be most welcome. It would scroll the frame (if necessary) such that a named widget is visible.


Scrollable frame, another implementation

pw March, 2014

This version is useful when using ttk widgets, as the background is the correct ttk color.

Scrollbars appear or disappear as needed when the frame is resized or the size of the contents changes.

It also handles mousewheel/trackpad scrolling.

    # sframe.tcl
    # Paul Walton
    # Create a ttk-compatible, scrollable frame widget.
    #   Usage:
    #       sframe new <path> ?-toplevel true?  ?-anchor nsew?
    #       -> <path>
    #
    #       sframe content <path>
    #       -> <path of child frame where the content should go>
    
    namespace eval ::sframe {
        namespace ensemble create
        namespace export *
    
        # Create a scrollable frame or window.
        proc new {path args} {
            # Use the ttk theme's background for the canvas and toplevel
            set bg [ttk::style lookup TFrame -background]
            if { [ttk::style theme use] eq "aqua" } {
                # Use a specific color on the aqua theme as 'ttk::style lookup' is not accurate.
                set bg "#e9e9e9"
            }
        
            # Create the main frame or toplevel.
            if { [dict exists $args -toplevel]  &&  [dict get $args -toplevel] } {
                toplevel $path  -bg $bg
            } else {
                ttk::frame $path
            }
            
            # Create a scrollable canvas with scrollbars which will always be the same size as the main frame.
            set canvas [canvas $path.canvas -bg $bg -bd 0 -highlightthickness 0 -yscrollcommand [list $path.scrolly set] -xscrollcommand [list $path.scrollx set]]
            ttk::scrollbar $path.scrolly -orient vertical   -command [list $canvas yview]
            ttk::scrollbar $path.scrollx -orient horizontal -command [list $canvas xview]
            
            # Create a container frame which will always be the same size as the canvas or content, whichever is greater. 
            # This allows the child content frame to be properly packed and also is a surefire way to use the proper ttk background.
            set container [ttk::frame $canvas.container]
            pack propagate $container 0
            
            # Create the content frame. Its size will be determined by its contents. This is useful for determining if the 
            # scrollbars need to be shown.
            set content [ttk::frame $container.content]
            
            # Pack the content frame and place the container as a canvas item.
            set anchor "n"
            if { [dict exists $args -anchor] } {
                set anchor [dict get $args -anchor]
            }
            pack $content -anchor $anchor
            $canvas create window 0 0 -window $container -anchor nw
            
            # Grid the scrollable canvas sans scrollbars within the main frame.
            grid $canvas   -row 0 -column 0 -sticky nsew
            grid rowconfigure    $path 0 -weight 1
            grid columnconfigure $path 0 -weight 1
            
            # Make adjustments when the sframe is resized or the contents change size.
            bind $path.canvas <Expose> [list [namespace current]::resize $path]
            
            # Mousewheel bindings for scrolling.
            bind [winfo toplevel $path] <MouseWheel>       [list +[namespace current] scroll $path yview %W %D]
            bind [winfo toplevel $path] <Shift-MouseWheel> [list +[namespace current] scroll $path xview %W %D]
            
            return $path
        }
    
    
        # Given the toplevel path of an sframe widget, return the path of the child frame suitable for content.
        proc content {path} {
            return $path.canvas.container.content
        }
    
    
        # Make adjustments when the the sframe is resized or the contents change size.
        proc resize {path} {
            set canvas    $path.canvas
            set container $canvas.container
            set content   $container.content
    
            # Set the size of the container. At a minimum use the same width & height as the canvas.
            set width  [winfo width $canvas]
            set height [winfo height $canvas]
            
            # If the requested width or height of the content frame is greater then use that width or height.
            if { [winfo reqwidth $content] > $width } {
                set width [winfo reqwidth $content]
            }
            if { [winfo reqheight $content] > $height } {
                set height [winfo reqheight $content]
            }
            $container configure  -width $width  -height $height
    
            # Configure the canvas's scroll region to match the height and width of the container.
            $canvas configure -scrollregion [list 0 0 $width $height]
    
            # Show or hide the scrollbars as necessary.
            # Horizontal scrolling.
            if { [winfo reqwidth $content] > [winfo width $canvas] } {
                grid $path.scrollx  -row 1 -column 0 -sticky ew
            } else {
                grid forget $path.scrollx
            }
            # Vertical scrolling.
            if { [winfo reqheight $content] > [winfo height $canvas] } {
                grid $path.scrolly  -row 0 -column 1 -sticky ns
            } else {
                grid forget $path.scrolly
            }
            return
        }
    
    
        # Handle mousewheel scrolling.    
        proc scroll {path view W D} {
            if { [winfo exists $path.canvas]  &&  [string match $path.canvas* $W] } {
                $path.canvas $view scroll [expr {-$D}] units
            }
            return
        }
    }

Demonstration

    # Generate some random content.
    for {set row 0} {$row < 100} {incr row} {
        for {set col 0} {$col < 100} {incr col} {
            append fuzz [string index {abcdefghijklmnopqrstuvwxyz0123456789} [expr {int(rand()*36)}]]
        }
        append fuzz \n
    }

    # Use the -toplevel option to create a scrollable toplevel window.
    sframe new .demo  -toplevel true  -anchor w

    # Retrieve the path where the scrollable contents go.
    set path [sframe content .demo]

    # Pack, grid, or place the contents of the scrollable frame.
    pack [ttk::label $path.randtext  -text $fuzz]

HaO 2015-02-26: Great work! I had to call 'sframe resize $win' if I resized the contained label by a font size change.


tco - 2016-06-21 08:59:50

Great, but impossible to create object with '-toplevel false' ? object are create but not visible

EMJ 2019-08-12: Well, if you run the demonstration with -toplevel false, the .demo that is created will be a frame, and there is nowhere for it to be until you pack, grid, or place it into some toplevel (presumably along with other things). Then you will be able to see it.