#!/usr/bin/env ruby

# widget --
# This script demonstrates the various widgets provided by Tk,
# along with many of the features of the Tk toolkit.  This file
# only contains code to generate the main window for the
# application, which invokes individual demonstrations.  The
# code for the actual demonstrations is contained in separate
# ".rb" files is this directory, which are sourced by this script
# as needed.

require 'tk'
# require 'tkafter'

### $DEBUG=1 ##########

#----------------------------------------------------------------
# The code below create the main window, consisting of a menu bar
# and a text widget that explains how to use the program, plus lists
# all of the demos as hypertext items.
#----------------------------------------------------------------

# widget demo directory
$demo_dir = File.dirname($0)

# root 
$root = TkRoot.new{title "Ruby/Tk Widget Demonstration"}

# tk 
$tk_version = Tk::TK_VERSION
$tk_major_ver, $tk_minor_ver = $tk_version.split('.').map{|n| n.to_i}
$tk_patchlevel = Tk::TK_PATCHLEVEL

# tcl_platform 
$tk_platform = TkVarAccess.new('tcl_platform')

#
case($tk_version)
when /^4.*/
  $font = TkFont.new('-*-Helvetica-Medium-R-Normal--*-140-*-*-*-*-*-*', nil)
else
  $font = TkFont.new('Helvetica -12')
end

# images
$image = {}

if $tk_major_ver >= 8
$image['refresh'] = TkPhotoImage.new(:height=>16, :format=>'GIF', :data=><<EOD)
    R0lGODlhEAAQAPMAAMz/zCpnKdb/1z9mPypbKBtLGy9NMPL/9Or+6+P+4j1Y
    PwQKBP7//xMLFAYBCAEBASH5BAEAAAAALAAAAAAQABAAAwR0EAD3Gn0Vyw0e
    ++CncU7IIAezMA/nhUqSLJizvSdCEEjy2ZIV46AwDAoDHwPYGSoEiUJAAGJ6
    EDHBNCFINW5OqABKSFk/B9lUa94IDwIFgewFMwQDQwCZQCztTgM9Sl8SOEMG
    KSAthiaOjBMPDhQONBiXABEAOw==
EOD
end

if $tk_major_ver >= 8
$image['view'] = TkPhotoImage.new(:height=>16, :format=>'GIF', :data=><<EOD)
    R0lGODlhEAAQAPMAAMz/zP///8DAwICAgH9/fwAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAACH5BAEAAAAALAAAAAAQABAAAwRIcMhJB7h3hM33
    KFjWdQQYap1QrCaGBmrRrS4nj5b53jOgbwXBKGACoYLDIuAoHCmZyYvR1rT5
    RMAq8LqcIYGsrjPsW1XOmFUEADs=
EOD
end

if $tk_major_ver >= 8
$image['delete'] = TkPhotoImage.new(:height=>16, :format=>'GIF', :data=><<EOD)
    R0lGODlhEAAOAKEAAIQAAO/n3v///////yH5BAEKAAIALAAAAAAQAA4AAAIm
    lI9pAKHbIHNoVhYhTdjlJ2AWKG2g+CldmB6rxo2uybYhbS80eRQAOw==
EOD
end

if $tk_major_ver >= 8
$image['print'] = TkPhotoImage.new(:height=>19, :format=>'GIF', :data=><<EOD)
    R0lGODlhGgATAPcAACEQOTEpQjEpUkIpc0IxY0I5c0oxjEo5SlJCY1JCe1JK
    UlpChFpCjFpGkFpSc1paa2NKc2NKnGNja2tapWtjc29KnHNanHNjc3NjrXNr
    jHNrnHNzc3tjpXtrtXtzhICAgIRzvYSEjIZzqox7tYyEnIyMjJSEtZSEvZSM
    lJyMtZyMvZyUlJyUrZyUvZycnKWctaWlpa2czq2lzrWtvbWtzrW1tb21xr21
    1sa9zs693s7OztbO3tbO597W1t7W7+fe7+fn5////+/n7+/v7+/v9////wAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAACH5BAEAAEEALAAAAAAaABMAQAj/AIMIHBhkg0GC
    CBMGIQEiQgseQT4oeCBBAokgRYYQ0JBixg8hRIiUUEBBYYmTByBwiCBCRYwH
    CxY8cKFw4AogRXLqLAJkQ80gCBBg3BkxZswTNGh4MGqgQQUMJRHCwMkTSE+D
    Pn8eCKBhxIMhO3ei2OHDBw6sWSlMMMoWgwwfMDZI8GBjx44NARZwEGGi5MkS
    PcIWKRGz5YgLbAco+KkQBQoJIRgjdGEVq+SaJajqtNrzMgsPCmoIzqmDgmWE
    KOBuUKAAwYabYTfs4OHjY0giGyhk4MAWRI4eKyRQqPgggYUXPH4A+XBAgwoK
    DiIsCFxjA9sFEVQQCRJCAYAFDJxiKhAxvMTonEFimrhhYinTBgWiCvxLNX3M
    DkkpsKV5OYhjBxCMYAICAigUEAA7
EOD
end

# 
TkMenubar.new($root, 
              [[['File', 0], 
                  ['About ... ', proc{aboutBox}, 0, '<F1>'],
                  '---', 
                  ['Quit', proc{exit}, 0, 'Meta-Q']
                ]]).pack('side'=>'top', 'fill'=>'x')
$root.bind('F1', proc{aboutBox})
$root.bind('Meta-q', proc{exit})

=begin
TkFrame.new($root){|frame|
  TkMenubutton.new(frame){|button|
    m = TkMenu.new(button) {
      add 'command', 'label'=>'Quit', 'command'=>proc{exit}, 'underline'=>0
    }
    menu m
    text 'File'
    underline 0
  }.pack('side'=>'left')
}.pack('side'=>'top', 'fill'=>'x')
=end

# 
if $tk_version =~ /^4\.[01]/
  scr = TkScrollbar.new($root, 'orient'=>'vertical')
  txt = TkText.new($root) {
    wrap 'word'
    width 70
    height 30
    font $font
    setgrid 'yes'
    yscrollcommand proc{|first,last| scr.set first,last}
  }
  scr.command(proc{|*args| txt.yview(*args)})
  scr.pack('side'=>'right', 'fill'=>'y')
  txt.pack('expand'=>'yes', 'fill'=>'both')
else
  textFrame = TkFrame.new($root)
  scr = TkScrollbar.new($root, 'orient'=>'vertical', 
                        'highlightthickness'=>0, 'takefocus'=>1) {
    pack('in'=>textFrame, 'side'=>'right', 'fill'=>'y', 'padx'=>1)
  }
  txt = TkText.new($root) {
    wrap 'word'
    width 70
    height 30
    font $font
    setgrid 'yes'
    highlightthickness 0
    padx 4
    pady 2
    takefocus 0
    bd 1
    yscrollcommand proc{|first,last| scr.set first,last}
  }
  scr.command(proc{|*args| txt.yview(*args)})
#  txt.pack('in'=>textFrame, 'expand'=>'yes', 'fill'=>'both', 'padx'=>1)
  txt.pack('in'=>textFrame, 'expand'=>'yes', 'fill'=>'both')
#  textFrame.pack('expand'=>'yes', 'fill'=>'both', 'padx'=>1, 'pady'=>2)
  textFrame.pack('expand'=>'yes', 'fill'=>'both')

  statusBar = TkFrame.new($root) {|f|
    $statusBarLabel = \
    TkLabel.new(f, 'text'=>"   ", 'relief'=>'sunken', 'bd'=>1, 'anchor'=>'w', 
                'font'=>'-*-Helvetica-Medium-R-Normal--*-120-*-*-*-*-*-*') \
        .pack('side'=>'left', 'padx'=>2, 'expand'=>'yes', 'fill'=>'both')
    TkLabel.new(f, 'width'=>8, 'relief'=>'sunken', 'bd'=>1, 'anchor'=>'w', 
                'font'=>'-*-Helvetica-Medium-R-Normal--*-120-*-*-*-*-*-*') \
        .pack('side'=>'left', 'padx'=>2)
  }.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>2)
end

# Create a bunch of tags to use in the text widget, such as those for
# section titles and demo descriptions.  Also define the bindings for
# tags.
  
tag_title = TkTextTag.new(txt, 'font'=>'-*-Helvetica-Bold-R-Normal--*-180-*-*-*-*-*-*')

# We put some "space" characters to the left and right of each demo description
# so that the descriptions are highlighted only when the mouse cursor
# is right over them (but not when the cursor is to their left or right)

tag_demospace = TkTextTag.new(txt, 'lmargin1'=>'1c', 'lmargin2'=>'1c')

if TkWinfo.depth($root) == 1
  tag_demo = TkTextTag.new(txt, 'lmargin1'=>'1c', 'lmargin2'=>'1c', 
                           'underline'=>1)
  $tag_visited = TkTextTag.new(txt, 'lmargin1'=>'1c', 'lmargin2'=>'1c', 
                              'underline'=>1)
  tag_hot = TkTextTag.new(txt, 'background'=>'black', 'foreground'=>'white')
else
  tag_demo = TkTextTag.new(txt, 'lmargin1'=>'1c', 'lmargin2'=>'1c', 
                           'foreground'=>'blue', 'underline'=>1)
  $tag_visited = TkTextTag.new(txt, 'lmargin1'=>'1c', 'lmargin2'=>'1c', 
                              'foreground'=>'#303080', 'underline'=>1)
#  tag_hot = TkTextTag.new(txt, 'relief'=>'raised', 'borderwidth'=>1, 
#                         'background'=>'SeaGreen3')
  tag_hot = TkTextTag.new(txt, 'borderwidth'=>1, 'foreground'=>'red')
end

#tag_demo.bind('Button-1', proc{invoke txt, txt.index('current')})
tag_demo.bind('ButtonRelease-1', 
              proc{|x,y|invoke txt, txt.index("@#{x},#{y}")}, '%x %y')

lastLine = TkVariable.new("")
newLine  = TkVariable.new("")
tag_demo.bind('Enter', proc{|x,y|
                lastLine.value = txt.index("@#{x},#{y} linestart")
                tag_hot.add(lastLine.value, "#{lastLine.value} lineend")
                showStatus txt, txt.index("@#{x},#{y}")
              },
              '%x %y')
tag_demo.bind('Leave', 
              proc{
                tag_hot.remove('1.0','end')
                txt.configure('cursor','xterm')
                $statusBarLabel.configure('text'=>"")
              })
tag_demo.bind('Motion', proc{|x, y|
                newLine.value = txt.index("@#{x},#{y} linestart")
                if newLine.value != lastLine.value
                  tag_hot.remove('1.0','end')
                  lastLine.value = newLine.value
                  if ( txt.tag_names("@#{x},#{y}").find{|t| 
                        t.kind_of?(String) && t =~ /^demo-/
                      } )
                    tag_hot.add(lastLine.value, 
                                "#{lastLine.value} lineend -1 chars")
                  end
                end
                showStatus txt, txt.index("@#{x},#{y}")
              },
              '%x %y')

# Create the text for the text widget.

txt.insert('end', "Ruby/Tk Widget Demonstrations\n\n", tag_title)
txt.insert('end', <<EOT)
This application provides a front end for several short scripts that \
demonstrate what you can do with Tk widgets.  Each of the numbered \
lines below describes a demonstration;  you can click on it to invoke \
the demonstration.  Once the demonstration window appears, you can \
click the "See Code" button to see the Ruby/Tk code that created the \
demonstration.  If you wish, you can edit the code and click the \
"Rerun Demo" button in the code window to reinvoke the demonstration \
with the modified code.

Some demo scripts require the recent version of Tk library \
(e.g. Tk8.4 or later) \
If your Tk library linked to Ruby doesn't support the functions \
required by the demo script, the demo doesn't work. \
In such a case, please re-compile tcltklib with the later Tk library \
which supports the required functions.


EOT

txt.insert('end', "Labels, buttons, checkbuttons, and radiobuttons.\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Labels (text and bitmaps).\n", tag_demo, "demo-label")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Labels and UNICODE text. (if supported)\n", tag_demo, "demo-unicodeout")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. Buttons.\n", tag_demo, "demo-button")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "4. Checkbuttons (select any of a group).\n", tag_demo, "demo-check")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "5. Checkbuttons (if supported).\n", tag_demo, "demo-check2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "6. Radiobuttons (select one of a group).\n", tag_demo, "demo-radio")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "7. Radiobuttons (if supported 'compound' option).\n", tag_demo, "demo-radio2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "8. Radiobuttons (if supported).\n", tag_demo, "demo-radio3")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "9. A 15-puzzle game made out of buttons.\n", tag_demo, "demo-puzzle")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "10. Iconic buttons that use bitmaps.\n", tag_demo, "demo-icon")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "11. Two labels displaying images.\n", tag_demo, "demo-image1")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "12. A simple user interface for viewing images.\n", tag_demo, "demo-image2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "13. A simple user interface for viewing images. (if supported)\n", tag_demo, "demo-image3")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "14. Labelled frames (if supported)\n", tag_demo, "demo-labelframe")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Listboxes\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. 50 states.\n", tag_demo, "demo-states")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Colors: change the color scheme for the application.\n", "#{tag_demo.id} demo-colors")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. A collection of famous sayings.\n", tag_demo, "demo-sayings")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Entries and Spin-boxes\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Without scrollbars.\n", tag_demo, "demo-entry1")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. With scrollbars.\n", tag_demo, "demo-entry2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', 
           "3. Validated entries and password fields. (if supported)\n", 
           tag_demo, "demo-entry3")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "4. Spin-boxes. (if supported)\n", tag_demo, "demo-spin")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "5. Simple Rolodex-like form.\n", tag_demo, "demo-form")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Text\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Basic editable text.\n", tag_demo, "demo-text")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Text display styles.\n", tag_demo, "demo-style")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. Hypertext (tag bindings).\n", tag_demo, "demo-bind")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "4. A text widget with embedded windows.\n", tag_demo, "demo-twind")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "5. A text widget with embedded windows. (if supported)\n", tag_demo, "demo-twind2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "6. A search tool built with a text widget.\n", tag_demo, "demo-search")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Canvases\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. The canvas item types.\n", tag_demo, "demo-items")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. A simple 2-D plot.\n", tag_demo, "demo-plot")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. Text items in canvases.\n", tag_demo, "demo-ctext")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "4. An editor for arrowheads on canvas lines.\n", tag_demo, "demo-arrow")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "5. A ruler with adjustable tab stops.\n", tag_demo, "demo-ruler")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "6. A building floor plan.\n", tag_demo, "demo-floor")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "7. A building floor plan. (another way to create canvas items)\n", tag_demo, "demo-floor2")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "8. A simple scrollable canvas.\n", tag_demo, "demo-cscroll")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Scales\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Vertical scale.\n", tag_demo.id, "demo-vscale")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Horizontal scale.\n", tag_demo.id, "demo-hscale")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Paned Windows\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Horizontal paned window. (if supported)\n", tag_demo.id, "demo-paned1")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Vertical paned window. (if supported)\n", tag_demo.id, "demo-paned2")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Menus\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Menus and cascades.\n", tag_demo, "demo-menu")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. Menus and cascades. (if supported)\n", tag_demo, "demo-menu84")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. Menubuttons\n", tag_demo, "demo-menubu")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Common Dialogs\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. Message boxes.\n", tag_demo, "demo-msgbox")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. File selection dialog.\n", tag_demo, "demo-filebox")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. Color picker.\n", tag_demo, "demo-clrpick")
txt.insert('end', " \n ", tag_demospace)

txt.insert('end', "\n")
txt.insert('end', "Miscellaneous\n", tag_title)
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "1. The built-in bitmaps.\n", tag_demo, "demo-bitmap")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "2. A dialog box with a local grab.\n", tag_demo, "demo-dialog1")
txt.insert('end', " \n ", tag_demospace)
txt.insert('end', "3. A dialog box with a global grab.\n", tag_demo, "demo-dialog2")
txt.insert('end', " \n ", tag_demospace)

txt.state('disabled')
scr.focus

# positionWindow --
# This procedure is invoked by most of the demos to position a
# new demo window.
#
# Arguments:
# w -           The name of the window to position.

def positionWindow(w)
  w.geometry('+300+300')
end

# showVars --
# Displays the values of one or more variables in a window, and
# updates the display whenever any of the variables changes.
#
# Arguments:
# w -           Name of new window to create for display.
# args -        Any number of names of variables.

$showVarsWin = {}
def showVars1(parent, *args)
  if $showVarsWin[parent.path]
    begin
      $showVarsWin[parent.path].destroy 
    rescue
    end
  end
  w = TkToplevel.new(parent) {|w|
    title "Variable values"
    TkLabel.new(w) {
      text "Variable values:"
      width 20
      anchor 'center'
      font '-Adobe-helvetica-medium-r-normal--*-180-*-*-*-*-*-*'
    }.pack('side'=>'top', 'fill'=>'x')
    len = 1
    args.each{|vnam,vbody|
      len = vnam.to_s.length if vnam.to_s.length > len
    }
    args.each{|vnam,vbody|
      TkFrame.new(w){|f|
        #TkLabel.new(f, 'text'=>"#{vnam}: ").pack('side'=>'left')
        TkLabel.new(f, 'text'=>"#{vnam}: ",'width'=>len+2).pack('side'=>'left')
        TkLabel.new(f, 'textvariable'=>vbody, 'anchor'=>'w')\
                   .pack('side'=>'left', 'expand'=>'yes', 'fill'=>'x')
      }.pack('side'=>'top', 'anchor'=>'w', 'fill'=>'x')
    }
    TkButton.new(w) {
      text "OK"
      command proc{w.destroy}
    }.pack('side'=>'bottom', 'pady'=>2)
  }
  $showVarsWin[parent.path] = w
end

def showVars2(parent, *args)
  if $showVarsWin[parent.path]
    begin
      $showVarsWin[parent.path].destroy 
    rescue
    end
  end
  $showVarsWin[parent.path] = TkToplevel.new(parent) {|w|
    title "Variable values"

    TkLabelFrame.new(w, :text=>"Variable values:", 
                     :font=>{:family=>'Helvetica', :size=>14}){|f|
      args.each{|vnam,vbody|
        TkGrid(TkLabel.new(f, :text=>"#{vnam}: ", :anchor=>'w'), 
               TkLabel.new(f, :textvariable=>vbody, :anchor=>'w'), 
               :padx=>2, :pady=>2, :sticky=>'w')
      }

      f.grid(:sticky=>'news', :padx=>4)
      f.grid_columnconfig(1, :weight=>1)
      f.grid_rowconfig(100, :weight=>1)
    }
    TkButton.new(w, :text=>"OK", :width=>8, :default=>:active, 
                 :command=>proc{w.destroy}){|b|
      w.bind('Return', proc{b.invoke})
      w.bind('Escape', proc{b.invoke})

      b.grid(:sticky=>'e', :padx=>4, :pady=>[6, 4])
    }
    w.grid_columnconfig(0, :weight=>1)
    w.grid_rowconfig(0, :weight=>1)
  }
end

if $tk_major_ver < 8
  alias showVars showVars1
elsif $tk_major_ver == 8 && $tk_minor_ver < 4
  alias showVars showVars1
else # ver >= 8.4
  alias showVars showVars2
end

# invoke --
# This procedure is called when the user clicks on a demo description.
# It is responsible for invoking the demonstration.
#
# Arguments:
# txt -         Name of text widget
# index -       The index of the character that the user clicked on.

def invoke (txt, index)
  tag = txt.tag_names(index).find{|t| t.kind_of?(String) && t =~ /^demo-/}
  return unless tag
  cursor = txt.cget('cursor')
  txt.cursor('watch')
  Tk.update
#  eval `cat #{tag[5..-1]}.rb`
#  eval `cat #{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb`
  eval IO.readlines("#{[$demo_dir, tag[5..-1]].join(File::Separator)}.rb").join
  Tk.update
#  txt.cursor('xterm')
  txt.cursor(cursor)

  $tag_visited.add("#{index} linestart +1 chars", "#{index} lineend +1 chars")
end

# showStatus --
#
#       Show the name of the demo program in the status bar. This procedure
#       is called when the user moves the cursor over a demo description.
#

def showStatus (txt, index)
  tag = txt.tag_names(index).find{|t| t.kind_of?(String) && t =~ /^demo-/}
  cursor = txt.cget('cursor')
  unless tag
    $statusBarLabel.configure('text', " ")
    newcursor = 'xterm'
  else
    demoname = tag[5..-1]
    $statusBarLabel.configure('text', 
                             "Run the \"#{demoname}\" sample program")
    newcursor = 'hand2'
  end
  txt.configure('cursor'=>newcursor) if cursor != newcursor
end

# showCode --
# This procedure creates a toplevel window that displays the code for
# a demonstration and allows it to be edited and reinvoked.
#
# Arguments:
# demo -        The name of the demonstration's window, which can be
#               used to derive the name of the file containing its code.

def showCode1(demo)
  file = "#{demo}.rb"
  $code_window = nil unless defined? $code_window
  if $code_window == nil || TkWinfo.exist?($code_window) == false
    $code_window = TkToplevel.new(nil)
    f = TkFrame.new($code_window)
    TkButton.new(f) {
      text "Dismiss"
      command proc{
        $code_window.destroy
        $code_window = nil
      }
    }.pack('side'=>'left', 'expand'=>'yes', 'pady'=>2)
    TkButton.new(f) {
      text "Rerun Demo"
      command proc{eval($code_text.get('1.0','end'))}
    }.pack('side'=>'left', 'expand'=>'yes', 'pady'=>2)
#    f.pack('side'=>'bottom', 'expand'=>'yes', 'fill'=>'x')
    f.pack('side'=>'bottom', 'fill'=>'x')

    if $tk_version =~ /^4\.[01]/
      s = TkScrollbar.new($code_window, 'orient'=>'vertical')
      $code_text = TkText.new($code_window) {
        height 40
        setgrid 'yes'
        yscrollcommand proc{|first,last| s.set first,last}
      }
      s.command(proc{|*args| $code_text.yview(*args)})
      s.pack('side'=>'right', 'fill'=>'y')
      $code_text.pack('side'=>'left', 'expand'=>'yes', 'fill'=>'both')
    else
      TkFrame.new($code_window) {|f|
        pack('expand'=>'yes', 'fill'=>'both', 'padx'=>1, 'pady'=>1)

        hs = TkScrollbar.new($code_window, 'highlightthickness'=>0, 
                             'orient'=>'horizontal')
        vs = TkScrollbar.new($code_window, 'highlightthickness'=>0, 
                             'orient'=>'vertical')
        $code_text = TkText.new($code_window) {|t|
          height 40
          wrap 'word'
          xscrollcommand proc{|first,last| hs.set first,last}
          yscrollcommand proc{|first,last| vs.set first,last}
          setgrid 'yes'
          highlightthickness 0
          pady 2
          padx 3
          hs.command(proc{|*args| $code_text.xview(*args)})
          vs.command(proc{|*args| $code_text.yview(*args)})
        }

        $code_text.grid('in'=>f, 'padx'=>1, 'pady'=>1, 'row'=>0, 'column'=>0, 
                        'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')
        vs.grid('in'=>f, 'padx'=>1, 'pady'=>1, 'row'=>0, 'column'=>1, 
                'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')
#       xs.grid('in'=>f, 'padx'=>1, 'pady'=>1, 'row'=>1, 'column'=>0, 
#               'rowspan'=>1, 'columnspan'=>1, 'sticky'=>'news')

# JKC 2001-07-26: segfaults under 1.7.1 (2001-06-19) [i686-linux]
        TkGrid.rowconfigure(f, 0, 'weight'=>1, 'minsize'=>0)
        TkGrid.columnconfigure(f, 0, 'weight'=>1, 'minsize'=>0)
      }
    end
  else
    $code_window.deiconify
    $code_window.raise
  end
  $code_window.title("Demo code: #{file}")
  $code_window.iconname(file)
#  fid = open(file, 'r')
  fid = open([$demo_dir, file].join(File::Separator), 'r')
  $code_text.delete('1.0', 'end')
  #$code_text.insert('1.0', `cat #{file}`)
  $code_text.insert('1.0', fid.read)
  #$code_mark = TkTextMark.new($code_text, '1.0')
  #$code_text.set_insert('1.0')
  TkTextMarkInsert.new($code_text,'1.0')
  fid.close
end

def showCode2(demo)
  file = "#{demo}.rb"
  $code_window = nil unless defined? $code_window
  if $code_window == nil || TkWinfo.exist?($code_window) == false
    $code_window = TkToplevel.new(nil)
    tf = TkFrame.new($code_window)
    $code_text = TkText.new(tf, :font=>'Courier 10', :height=>30, 
                            :wrap=>'word', :bd=>1, :setgrid=>true, 
                            :highlightthickness=>0, :pady=>2, :padx=>3)
    xscr = TkScrollbar.new(tf, :bd=>1){assign($code_text)}
    yscr = TkScrollbar.new(tf, :bd=>1){assign($code_text)}
    TkGrid($code_text, yscr, :sticky=>'news')
    #TkGrid(xscr)
    tf.grid_rowconfigure(0, :weight=>1)
    tf.grid_columnconfigure(0, :weight=>1)

    bf = TkFrame.new($code_window)
    
    b_dis = TkButton.new(bf, :text=>'Dismiss', :default=>:active, 
                         :command=>proc{
                           $code_window.destroy
                           $code_window = nil
                         }, 
                         :image=>$image['delete'], :compound=>:left)
    b_prn = TkButton.new(bf, :text=>'Print Code', 
                         :command=>proc{printCode($code_text, file)}, 
                         :image=>$image['print'], :compound=>:left)
    b_run = TkButton.new(bf, :text=>'Rerun Demo', 
                         :command=>proc{eval($code_text.get('1.0','end'))}, 
                         :image=>$image['refresh'], :compound=>:left)

    TkGrid('x', b_run, b_prn, b_dis, :padx=>4, :pady=>[6,4])
    bf.grid_columnconfigure(0, :weight=>1)

    TkGrid(tf, :sticky=>'news')
    TkGrid(bf, :sticky=>'ew')
    $code_window.grid_columnconfigure(0, :weight=>1)
    $code_window.grid_rowconfigure(0, :weight=>1)

    $code_window.bind('Return', proc{|win|
                        b_dis.invoke unless win.kind_of?(TkText)
                      }, '%W')
    $code_window.bindinfo('Return').each{|cmd, arg|
      $code_window.bind_append('Escape', cmd, arg)
    }
  else
    $code_window.deiconify
    $code_window.raise
  end

  $code_window.title("Demo code: #{file}")
  $code_window.iconname(file)
  fid = open([$demo_dir, file].join(File::Separator), 'r')
  $code_text.delete('1.0', 'end')
  $code_text.insert('1.0', fid.read)
  TkTextMarkInsert.new($code_text,'1.0')
  fid.close
end

if $tk_major_ver < 8
  alias showCode showCode1
elsif $tk_major_ver == 8 && $tk_minor_ver < 4
  alias showCode showCode1
else # ver >= 8.4
  alias showCode showCode2
end


# printCode --
# Prints the source code currently displayed in the See Code dialog.
# Much thanks to Arjen Markus for this.
#
# Arguments:
# txt -         Name of text widget containing code to print
# file -        Name of the original file (implicitly for title)

def printCode(txt, file)
  code = txt.get('1.0', 'end - 1c')
  dir = '.'
  dir = ENV['HOME'] if ENV['HOME']
  dir = ENV['TMP'] if ENV['TMP']
  dir = ENV['TEMP'] if ENV['TEMP']

  fname = [dir, 'tkdemo-' + file].join(File::Separator)
  open(fname, 'w'){|fid| fid.print(code)}
  begin
    case Tk::TCL_PLATFORM('platform')
    when 'unix'
      msg = `lp -c #{fname}`
      unless $?.exitstatus == 0
        Tk.messageBox(:title=>'Print spooling failure', 
                      :message=>'Print spooling probably failed: ' + msg)
      end
    when 'windows'
      begin
        printTextWin32(fname)
      rescue => e
        Tk.messageBox(:title=>'Print spooling failure', 
                      :message=>'Print spooling probably failed: ' + 
                      e.message)
      end      
    when 'macintosh'
      Tk.messageBox(:title=>'Operation not Implemented', 
                    :message=>'Oops, sorry: not implemented yet!')
    else
      Tk.messageBox(:title=>'Operation not Implemented', 
                    :message=>'Wow! Unknown platform: ' + 
                    Tk::TCL_PLATFORM('platform'))
    end
  ensure
    File.delete(fname)
  end
end

# printTextWin32 --
#    Print a file under Windows
#
# Arguments:
# filename -            Name of the file
#
def printTextWin32(fname)
  require 'win32/registry'
  begin
    app = Win32::Registry::HKEY_CLASSES_ROOT['.txt']
    pcmd = nil
    Win32::Registry::HKEY_CLASSES_ROOT.open("#{app}\\shell\\print"){|reg|
      pcmd = reg['command']
    }
  rescue
    app = Tk.tk_call('auto_execok', 'notepad.exe')
    pcmd = "#{app} /p %1"
  end

  pcmd.gsub!('%1', fname)
  puts pcmd
  cmd = Tk.tk_call('auto_execok', 'start') + ' /min ' + pcmd
  
  msg = `#{cmd}`
  unless $?.exitstatus == 0
    fail RuntimeError, msg
  end
end

# aboutBox
#
#      Pops up a message box with an "about" message
#
def aboutBox
  Tk.messageBox('icon'=>'info', 'type'=>'ok', 'title'=>'About Widget Demo', 
                'message'=>"Ruby/Tk widget demonstration Ver.1.4.4-en\n\n" + 
                           "based on demos of Tk8.1 -- 8.5  " + 
                           "( Copyright:: " + 
                           "(c) 1996-1997 Sun Microsystems, Inc. / " + 
                           "(c) 1997-2000 Ajuba Solutions, Inc. / " + 
                           "(c) 2001-2003 Donal K. Fellows )\n\n" +
                           "Your Ruby & Tk Version ::\n" + 
                           "Ruby#{RUBY_VERSION}(#{RUBY_RELEASE_DATE})[#{RUBY_PLATFORM}] / Tk#{$tk_patchlevel}#{(Tk::JAPANIZED_TK)? '-jp': ''}")
end

#########################################
# start demos if given at command line
no_launcher = false
if ARGV[0] == '-n'
  ARGV.shift
  no_launcher = true if ARGV.size > 0
end
ARGV.each{|cmd| 
  if cmd =~ /(.*).rb/
    cmd = $1
  end
  eval IO.readlines("#{[$demo_dir, cmd].join(File::Separator)}.rb").join
}
if no_launcher
  $root.withdraw   # hide root window
  Thread.start{
    loop do
      count = 0
      $root.winfo_children.each{|w|
        count += 1 if w.kind_of?(TkToplevel)
      }
      $root.destroy if count == 0
    end
  }
end

#########################################
# start eventloop
Tk.mainloop