proc Font_Select {{top .fontsel}} {
   global font

   # Create File, Font, Size, and Format menus

   toplevel $top -class Fontsel -bd 10
   set menubar [menu $top.menubar]
   $top config -menu $menubar
   foreach x {File Font Size Format} {
      set menu [menu $menubar.[string tolower $x]]
      $menubar add cascade -menu $menu -label $x
   }
   $menubar.file add command -label Reset -command FontReset
   $menubar.file add command -label OK 
      -command {set font(ok) ok}
   $menubar.file add command -label Cancel 
      -command {set font(ok) cancel}

   # The Fonts menu lists the available Font families.

   set allfonts [font families]
   set numfonts [llength $allfonts]
   set limit 20
   if {$numfonts < $limit} {

      # Display the fonts in a single menu

      foreach family $allfonts {
         $menubar.font add radio -label $family 
            -variable font(-family) 
            -value $family 
            -command FontUpdate
      }
   } else {

      # Too many fonts. Create a set of cascaded menus to
      # display all the font possibilities

      set c 0 ; set l 0
      foreach family $allfonts {
         if {$l == 0} {
            $menubar.font add cascade -label $family... 
               -menu $menubar.font.$c
            set m [menu $menubar.font.$c]
            incr c
         }
         $m add radio -label $family 
            -variable font(-family) 
            -value $family 
            -command FontUpdate
         set l [expr ($l +1) % $limit]
      }
   }

   # Complete the other menus

   foreach size {7 8 10 12 14 18 24 36 72} {
      $menubar.size add radio -label $size 
         -variable font(-size) 
         -value $size 
         -command FontUpdate
   }
   $menubar.size add command -label Other... 
         -command [list FontSetSize $top]
   $menubar.format add check -label Bold 
         -variable font(-weight) 
         -onvalue bold -offvalue normal 
         -command FontUpdate
   $menubar.format add check -label Italic 
         -variable font(-slant) 
         -onvalue italic -offvalue roman 
         -command FontUpdate
   $menubar.format add check -label underline 
      -variable font(-underline) 
      -command FontUpdate
   $menubar.format add check -label overstrike 
      -variable font(-overstrike) 
      -command FontUpdate

   # FontReset initializes the font array, which causes
   # the radio menu entries to get highlighted.

   FontReset

   # This label displays the current font

   label $top.font -textvar font(name) -bd 5
   # This message displays a sampler of the font.

   message $top.msg -aspect 1000 
                -borderwidth 10 -font fontsel 
                -text "
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
0123456789
!@#$%^&*()_+-=[]{};:"''~,.<>/?\|
"

   # Lay out the dialog

   pack $top.font $top.msg -side top
   set f [frame $top.buttons]
   button $f.ok -text Ok -command {set font(ok) 1}
   button $f.cancel -text Cancel -command {set font(ok) 0}
   pack $f.ok $f.cancel -padx 10 -side left
   pack $f -side top

   # Dialog_Wait is defined in Example 36–1 on page 521

   set font(ok) cancel
   Dialog_Wait $top font(ok)
   destroy $top
   if {$font(ok) == "ok"} {
      return [array get font -*]
   } else {
     return {}
   }
}

# FontReset recreates a default font

proc FontReset {} {
   catch {font delete fontsel}
   font create fontsel
   FontSet
}

# FontSet initializes the font array with the settings
# returned by the font actual command

proc FontSet {} {
   global font

   # The name is the font configuration information
   # with a line break so it looks nicer

   set font(name) [font actual fontsel]
   regsub -- "-slant" $font(name) "
-slant" font(name)

   # Save the actual parameters after any font substitutions

   array set font [font actual fontsel]
}

# FontSetSize adds an entry widget to the dialog so you
# can enter a specific font size.

proc FontSetSize {top} {
   set f [frame $top.size -borderwidth 10]
   pack $f -side top -fill x
   label $f.msg -text "Size:"
   entry $f.entry -textvariable font(-size)
   bind $f.entry <Return> FontUpdate
   pack $f.msg -side left
   pack $f.entry -side top -fill x
}
# FontUpdate is called when any of the font settings
# are changed, either from the menu or FontSetSize

proc FontUpdate {} {
   global font

   # The elements of font that have a leading - are
   # used directly in the font configuration command.

   eval {font configure fontsel}[array get font -*]
   FontSet
}