'''2004-06-12''' [SRIV] I am not a wubwikit user yet. This is a network traffic/activity indicator as done on the Windows systray that you can add to your GUI network apps. You just call the blinkon proc with the name of the label widget you created to hold the image along with either rx or tx to indicate the network traffic direction. 
It keeps the indicator lit for 400ms, then automatically goes off. This gives it a pleasing display. 
You place the call to blinkon in your fileevent procedures for socket readable/writable.
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Screenshot

[http://www.sriv.net/images/net-activity.jpg]

  package require Tk
  
  #network activity icon
  # 2004-06-12 Steve Redler IV
  
  set ::networkright [image create photo .networkright -data {
    R0lGODlhEAAQAKUAALq6y4mmz3l5y5O2xoXP94/g/7Hn9Mb8/53c9ZHK7Z/o
    /6Pq/5nl/47a+4zf/3HR/zg4XmfM/13H/zSz/1Sz9oSEzcXF2ZeX0G5uzFJf
    ll1dnN7e37Cw1pOTzI+PwFR5qYmJ1GFhxsfH2+Dg4dnZ3c3N3bm5zJmZwJeX
    wMDA4Ht7zIqKv1JghfPz8/Ly8sDA26CgzJKSwNLS262txYeJtf//////////
    /////////////////////////////////yH5BAEKAD8ALAAAAAAQABAAAAZ6
    wJ9wCCgCAkjBcPkbEAqGAyKhZAqdBcWC0aj+jMckg+F4eAeQtFoQaUfO6nVb
    IoHHIYLJhEKxxwUVFV5Xd3gWFxgZSwMajY4CGxwdHkwfIJchIiMkJSYnTCgp
    hyorKKYoLEsXLS4bLzAxVkMXJCMyJTM0skOnpru/u0EAOw==}]
    
  set ::networkleft [image create photo .networkleft -data {
    R0lGODlhEAAQAKUAALq6y4mmz3l5y5O2xjg4XoXP94/g/7Hn9Mb8/5zn/5HK
    7Znl/4HZ/3rV/2fM/11dnGTK/4SEzUe8/07A/0q+/0Sx+cXF2ZeX0G5uzFJf
    llSz9t7e37Cw1pOTzI+PwFR5qYmJ1GFhxsfH2+Dg4dnZ3c3N3bm5zJmZwJeX
    wMDA4Ht7zIqKv1JghfPz8/Ly8sDA26CgzJKSwNLS262txYeJtf//////////
    /////////////////////////////////yH5BAEKAD8ALAAAAAAQABAAAAZ+
    wJ9wCCgCAkjBcPkbEJ5QJVPohD6lP+MxacUOCoYDIqEQdIdfw2JdMEfRBYa8
    4RA87g+vY7+HCCIRWFQSEhMTFBUCFhcYGUsDGpGSAhscHR5MHyCbISIjJCUm
    J0woKYsqKyiqKCxLFy0uGy8wMVNDFyQjMiUzNLZDq6q/w79BADs=}]
    
  set ::networkon [image create photo .networkon -data {  
    R0lGODlhEAAQAKUAALq6y4mmz3l5y5O2xoXP94/g/7Hn9Mb8/53c9ZHK7Z/o
    /6Pq/5nl/47a+4zf/3HR/5zn/2fM/13H/4HZ/3rV/zSz/1Sz9mTK/4SEzUe8
    /07A/0q+/0Sx+cXF2ZeX0G5uzFJflt7e37Cw1pOTzI+PwFR5qYmJ1GFhxsfH
    2+Dg4dnZ3c3N3bm5zJmZwJeXwMDA4Ht7zIqKv1JghfPz8/Ly8sDA26CgzJKS
    wNLS262txYeJtf///////////////////yH5BAEKAD8ALAAAAAAQABAAAAaD
    wJ9wCCgCAkjBcPkbEAqGAyKhZAqdBcWC0aj+jMckg+F4eLFRCDXCjpyfYwZB
    wJZI3pM8xV2pWCxnbWwXAhgYXlcZGRoaGxwCHR4fIEsDf5eAISIjJEwlJqAn
    KCkqKywtTC4vkTAxLq8uMkseMzQhNTY3VkMeKik4Kzk6u0Owr8TIxEEAOw==}]
    
  set ::networkoff [image create photo .networkoff -data {  
    R0lGODlhEAAQAKUAALq6y4mmz3l5y5O2xjg4Xl1dnISEzcXF2ZeX0G5uzFJf
    lt7e37Cw1pOTzI+PwFR5qYmJ1GFhxsfH2+Dg4dnZ3c3N3bm5zJmZwJeXwMDA
    4Ht7zIqKv1JghfPz8/Ly8sDA26CgzJKSwNLS262txYeJtf//////////////
    ////////////////////////////////////////////////////////////
    /////////////////////////////////yH5BAEKAD8ALAAAAAAQABAAAAZo
    wJ9wCCgCAkjBcPkbEJ5QJVPohD6lP+MxacVWu93hNxqmWq+FdMF7JggMBqz5
    LDggEorlQK0WLBgNDkwPEIUREhMUFRYXTBgZdhobGJQYHEsIHR4LHyAhU0MI
    FBMiFSMkoEOVlKmtqUEAOw==}]
    
  set ::networknc [image create photo .networknc -data { 
    R0lGODlhEAAQAKUAALq6y4mmz3l5y5O2xjg4Xv8CAtIOFrwUINF8iJWTuHom
    P00yU4drtOgIDJAgNcM3W25Ti11dnNIpRYSEzaYaK9GaqZeX0G5uzFJfloBJ
    evsbG7Cw1pOTzI+PwFR5qYmJ1OQgMMohQ8fH2+Dg4foaGuhcY7m5zJmZwJeX
    wMDA4N5uefMSGYlttYqKv612lqKGq1JghfPz8/PX19treqCgzJKSwNnZ3dLS
    283N3a2txYeJtf///////////////////yH5BAEKAD8ALAAAAAAQABAAAAaK
    wJ9wCCgCAkjBcPkbEJ5QJbPQhBoOBOnPiCgkAgJFYZEdOp8HA4HRcDy1Z8Ki
    oXio32YoQdEoQCKAcHoEBRITE1pCcQQUfRUWFxhLA4AREAUZDxobHB1MHh8f
    ICEiIyQlJidMKCkqKywtKC4FLzBLFjEyGjM0NUIFVLc2Izc4OTpMqyjLKMnO
    z0tBADs=}]  
    
    
  proc blinkoff {labelname dir} {
    
    switch $dir {
      
      tx  {set ::txlight 0}
          
      rx  {set ::rxlight 0}   
            
    }  
    
    if {$::rxlight && $::txlight} {
      $labelname configure -image $::networkon 
      return
    }
    
    if {$::rxlight && ! $::txlight} {
      $labelname configure -image $::networkright 
      return
    }  
      
    if {! $::rxlight && $::txlight} {
      $labelname configure -image $::networkleft 
      return
    }  
    
    $labelname configure -image $::networkoff  
  
  }
  
  proc blinkon {labelname dir} { 
    
    switch $dir {
      
      tx  {if {$::txlight} {
             return
           } else {
             set ::txlight 1
             after 400 [list blinkoff $labelname tx]
           }
          }
          
      rx  {if {$::rxlight} {
             return
           } else {
             set ::rxlight 1
             after 400 [list blinkoff $labelname rx]
           }
          }         
    }
    
    if {$::rxlight && $::txlight} {
      $labelname configure -image $::networkon 
      return
    }
    
    if {$::rxlight && ! $::txlight} {
      $labelname configure -image $::networkright
      return
    }  
      
    if {! $::rxlight && $::txlight} {
      $labelname configure -image $::networkleft
      return
    }  
    
    $labelname configure -image $::networkoff   
  
  }

  
  #start of demo code
  set ::txlight 0
  set ::rxlight 0
  label .label1 -width 4  -borderwidth 1
  label .label2 -text "Net Activity"
  button .button1 -text "connect" -width 10 -command {set ::connected 1; backgroundprocess}
  button .button2 -text "disconnect" -width 10 -command {set ::connected 0}
  pack .button1  -fill x
  pack .button2  -fill x
  pack .label1 -side left  -expand n -fill none
  pack .label2 -side right -expand n -fill none
  
  
  .label1 configure -image $::networknc  -width 16 -height 16
  wm geometry . 110x80
  update
  set ::connected 1
  
  
  proc backgroundprocess {} {
   if {! $::connected} {.label1 configure -image $::networknc; return}
   
   after   10 [list blinkon .label1 rx]
   after 1000 [list blinkon .label1 tx]   
   after 1500 [list blinkon .label1 rx] 
   after 1500 [list blinkon .label1 tx]
   after 2000 [list backgroundprocess] 
  }

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[Category Application] |
[Category Networking] |
[Category GUI]