#Utilities for Grader. Used for a fileselect dialogue
#stolen from TkNet.
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# TkNet - Utilities Module
# Charlie KEMPSON - charlie@siren.demon.co.uk
# http://public.logica.com/~kempsonc/tknet.htm
# Version 1.1
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###############################################################
#
# Copyright (c) 1995-1996 Charlie Kempson
#
# This program is free software; you can redistribute it
# and/or modify it under the terms of the GNU General
# Public License as published by the Free Software
# Foundation (version 2 of the License).
#
# This program is distributed in the hope that it will
# be useful, but WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# For a copy of the GNU General Public License, write to the
# Free Software Foundation, Inc., 675 Mass Ave, Cambridge,
# MA 02139, USA.
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###############################################################
# Centre a window on the screen (or parent)
proc Centre_Dialog {window {position ""} {parent ""}} {
# Withdraw dialog and update all windows
wm withdraw $window
update idletasks
set win_width [winfo reqwidth $window]
set win_height [winfo reqheight $window]
# Read the positioning argument (pointer, widget, default)
switch -glob -- $position {
p* {
# place at POINTER (centered is $a == center)
wm geometry $window +[expr \
[winfo pointerx $window]-$win_width \
/2]+[expr [winfo pointery $window]-\
$win_height/2]
}
w* {
# center about WIDGET $parent
wm geometry $window +[expr [winfo rootx $parent]+ \
([winfo width $parent]-$win_width)/2]+[expr \
[winfo rooty $parent]+([winfo height \
$parent]-$win_height)/2]
}
default {
wm geometry $window +[expr ([winfo screenwidth \
$window]-$win_width) / 2]+[expr ([winfo screenheight \
$window]- $win_height) / 2]
}
}
# Now show the window
wm deiconify $window
}
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