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    1: #Utilities for Grader. Used for centering dialogues 
    2: #stolen from TkNet.
    3: 
    4: ###############################################################
    5: # TkNet - Utilities Module
    6: # Charlie KEMPSON - charlie@siren.demon.co.uk
    7: # http://public.logica.com/~kempsonc/tknet.htm
    8: # Version 1.1
    9: ###############################################################
   10: 
   11: ###############################################################
   12: #
   13: #    Copyright (c) 1995-1996 Charlie Kempson
   14: #
   15: #    This program is free software; you can redistribute it 
   16: #    and/or modify it under the terms of the GNU General 
   17: #    Public License as published by the Free Software 
   18: #    Foundation (version 2 of the License).
   19: #
   20: #    This program is distributed in the hope that it will 
   21: #    be useful, but WITHOUT ANY WARRANTY; without even the 
   22: #    implied warranty of MERCHANTABILITY or FITNESS FOR A 
   23: #    PARTICULAR PURPOSE.  See the GNU General Public License 
   24: #    for more details.
   25: #
   26: #    For a copy of the GNU General Public License, write to the 
   27: #    Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
   28: #    MA 02139, USA.
   29: ###############################################################
   30: ###############################################################
   31: # Centre a window on the screen (or parent)
   32: proc Centre_Dialog {window {position ""} {parent ""}} {
   33: 
   34:    # Withdraw dialog and update all windows
   35:    wm withdraw $window
   36:    update idletasks
   37:    set win_width [winfo reqwidth $window]
   38:    set win_height [winfo reqheight $window]
   39: 
   40:    # Read the positioning argument (pointer, widget, default)
   41:    switch -glob -- $position {
   42:       p* {
   43:          # place at POINTER (centered is $a == center)
   44:          wm geometry $window +[expr \
   45:             [winfo pointerx $window]-$win_width \
   46:             /2]+[expr [winfo pointery $window]-\
   47:             $win_height/2]
   48:       }
   49:       w* {
   50:          # center about WIDGET $parent
   51:          wm geometry $window +[expr [winfo rootx $parent]+ \
   52:             ([winfo width $parent]-$win_width)/2]+[expr \
   53:             [winfo rooty $parent]+([winfo height \
   54:             $parent]-$win_height)/2]
   55:       }
   56:       default {
   57:          wm geometry $window +[expr ([winfo screenwidth \
   58:             $window]-$win_width) / 2]+[expr ([winfo screenheight \
   59:             $window]- $win_height) / 2]
   60:       }
   61:    }
   62: 
   63:    # Now show the window
   64:    wm deiconify $window
   65: }