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#
# 'CBB' -- Check Book Balancer
#
# undo.tcl -- Undo routines.
#
# Written by Curtis Olson. Started December 7, 1996.
#
# Copyright (C) 1994 - 1997 Curtis L. Olson - curt@sledge.mn.org
#
# 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 2.5 1997/04/11 20:26:52 curt Exp $
# (Log is kept at end of this file)
#------------------------------------------------------------------------------
# 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
}
# ----------------------------------------------------------------------------
# $Log: undo.tcl,v $
# Revision 2.5 1997/04/11 20:26:52 curt
# $index1, $index2 wrapped up so they are now $cbb(index1), and $cbb(index2)
#
# Revision 2.4 1997/01/02 04:38:39 curt
# Changes over the 1996 holidays:
# - Converted listbox to text widget. This allows us to do nice
# things with alternating background colors, highliting, red
# negative numbers, etc.
# - Negative transactions are now drawn in red.
# - Added a Goto <Today> option.
# - <Home> & <End> were double bound. Now, listbox can be traversed with
# <Meta-Home> and <Meta-End>
#
# Revision 2.3 1996/12/17 14:54:03 curt
# Updated copyright date.
#
# Revision 2.2 1996/12/14 17:15:26 curt
# The great overhaul of December '96.
#
# Revision 2.1 1996/12/08 07:37:50 curt
# Initial revision.
#
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