mingw/lib/tk8.5/demos/textpeer.tcl

   1 # textpeer.tcl --
   2 #
   3 # This demonstration script creates a pair of text widgets that can edit a
   4 # single logical buffer. This is particularly useful when editing related text
   5 # in two (or more) parts of the same file.
   6
   7 if {![info exists widgetDemo]} {
   8     error "This script should be run from the \"widget\" demo."
   9 }
  10
  11 package require Tk
  12
  13 set w .textpeer
  14 catch {destroy $w}
  15 toplevel $w
  16 wm title $w "Text Widget Peering Demonstration"
  17 wm iconname $w "textpeer"
  18 positionWindow $w
  19
  20 set count 0
  21
  22 ## Define a widget that we peer from; it won't ever actually be shown though
  23 set first [text $w.text[incr count]]
  24 $first insert end "This is a coupled pair of text widgets; they are peers to "
  25 $first insert end "each other. They have the same underlying data model, but "
  26 $first insert end "can show different locations, have different current edit "
  27 $first insert end "locations, and have different selections. You can also "
  28 $first insert end "create additional peers of any of these text widgets using "
  29 $first insert end "the Make Peer button beside the text widget to clone, and "
  30 $first insert end "delete a particular peer widget using the Delete Peer "
  31 $first insert end "button."
  32
  33 ## Procedures to make and kill clones; most of this is just so that the demo
  34 ## looks nice...
  35 proc makeClone {w parent} {
  36     global count
  37     set t [$parent peer create $w.text[incr count] -yscroll "$w.sb$count set"\
  38                   -height 10 -wrap word]
  39     set sb [scrollbar $w.sb$count -command "$t yview" -orient vertical]
  40     set b1 [button $w.clone$count -command "makeClone $w $t" \
  41                     -text "Make Peer"]
  42     set b2 [button $w.kill$count -command "killClone $w $count" \
  43                     -text "Delete Peer"]
  44     set row [expr {$count * 2}]
  45     grid $t $sb $b1 -sticky nsew -row $row
  46     grid ^  ^   $b2 -row [incr row]
  47     grid configure $b1 $b2 -sticky new
  48     grid rowconfigure $w $b2 -weight 1
  49 }
  50 proc killClone {w count} {
  51     destroy $w.text$count $w.sb$count
  52     destroy $w.clone$count $w.kill$count
  53 }
  54
  55 ## Now set up the GUI
  56 makeClone $w $first
  57 makeClone $w $first
  58 destroy $first
  59
  60 ## See Code / Dismiss buttons
  61 grid [addSeeDismiss $w.buttons $w] - - -sticky ew -row 5000
  62 grid columnconfigure $w 0 -weight 1