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#
# 'CBB' -- Check Book Balancer
#
# undo.tcl -- Undo routines.
#
# Written by Curtis Olson. Started December 7, 1996.
#
# Copyright (C) 1994 - 1999 Curtis L. Olson - curt@me.umn.edu
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# $Id: undo.tcl,v 1.1.1.1 1999/12/18 02:05:32 curt Exp $
#------------------------------------------------------------------------------
# Procedures to handle undo functionality
#------------------------------------------------------------------------------
proc undoInit {} {
global undo
set undo(command) ""
set undo(data) ""
}
proc undoRegister arg {
global undo
set pos [string first " " $arg]
set undo(command) [string range $arg 0 [expr $pos - 1]]
set undo(data) [string range $arg [expr $pos + 1] end]
}
proc undoAction {} {
global cbb key eng undo
if { $cbb(debug) } { puts "un$undo(command) $undo(data)" }
if { "$undo(command)" == "delete" } {
# reinsert
update_globals $undo(data)
set key ""
done_entering
} elseif { "$undo(command)" == "insert" } {
# delete
set pos [string first "\t" $undo(data)]
set key [string range $undo(data) 0 [expr $pos - 1]]
puts $eng "delete_trans $key"; flush $eng
gets $eng result
if { $cbb(debug) } { puts "deleting: $result" }
set cbb(index1) [find_index_from_key [listGetSize] $key]
if { [expr $cbb(index1) < 0] } {
set cbb(index1) 0
}
update_rest $cbb(index1) $key
} elseif { "$undo(command)" == "edit" } {
# change back
set newkey [string range $undo(data) 0 10]
if { $cbb(debug) } { puts "first need to delete $newkey" }
puts $eng "delete_trans $newkey"; flush $eng
gets $eng result
if { $cbb(debug) } { puts "deleting: $result" }
set cbb(index1) [find_index_from_key [listGetSize] $newkey]
if { [expr $cbb(index1) < 0] } {
set cbb(index1) 0
}
update_rest $cbb(index1) $newkey
if { $cbb(debug) } {
puts "-> [string range $undo(data) 12 end]"
}
update_globals [string range $undo(data) 12 end]
done_entering
} else {
cbbWindow.ok "Nothing to undo :-("
tkwait window .ok
}
undoInit
clear_entry_area
}
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