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# Copyright (C) 2005-2007 Tresys Technology, LLC
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
namespace eval Apol_Range_Dialog {
variable dialog ""
variable vars
}
# Create a dialog box to allow the user to select an MLS range (either
# a single level or two levels. Ensure that the selected range is
# valid (i.e., high dominates low). If the range is invalid or if no
# range is selected then return an empty list. Returns an instance of
# an apol_mls_range_t; the caller must delete it afterwards.
proc Apol_Range_Dialog::getRange {{defaultRange {}} {parent .}} {
variable dialog
variable vars
if {![winfo exists $dialog]} {
_create_dialog $parent
}
set f [$dialog getframe]
Apol_Widget::resetLevelSelectorToPolicy $f.low
Apol_Widget::resetLevelSelectorToPolicy $f.high
set vars($dialog:highenable) 0
if {$defaultRange != {}} {
set low_level [$defaultRange get_low]
set high_level [$defaultRange get_high]
Apol_Widget::setLevelSelectorLevel $f.low $low_level
if {[apol_mls_level_compare $::ApolTop::policy $low_level $high_level] != $::APOL_MLS_EQ} {
set vars($dialog:highenable) 1
Apol_Widget::setLevelSelectorLevel $f.high $high_level
}
}
_high_enabled $dialog
# force a recomputation of button sizes (bug in ButtonBox)
$dialog.bbox _redraw
set retval [$dialog draw]
if {$retval == -1 || $retval == 1} {
return {}
}
_get_range $dialog
}
########## private functions below ##########
proc Apol_Range_Dialog::_create_dialog {parent} {
variable dialog
variable vars
set dialog [Dialog .range_dialog -modal local -parent $parent \
-separator 1 -homogeneous 1 -title "Select Range"]
array unset vars $dialog:*
set f [$dialog getframe]
set low_label [label $f.ll -text "Single level"]
set low_level [Apol_Widget::makeLevelSelector $f.low 12]
set high_cb [checkbutton $f.high_enable \
-text "High level" \
-variable Apol_Range_Dialog::vars($dialog:highenable) \
-command [list Apol_Range_Dialog::_high_enabled $dialog]]
set high_level [Apol_Widget::makeLevelSelector $f.high 12]
Apol_Widget::setLevelSelectorState $high_level 0
grid $low_label $high_cb -sticky w
grid $low_level $high_level -sticky ns
grid columnconfigure $f 0 -weight 1 -uniform 1 -pad 4
grid columnconfigure $f 1 -weight 1 -uniform 1 -pad 4
$dialog add -text "OK" -command [list Apol_Range_Dialog::_okay $dialog]
$dialog add -text "Cancel"
}
proc Apol_Range_Dialog::_get_range {dialog} {
variable vars
set f [$dialog getframe]
set range [new_apol_mls_range_t]
if {[ApolTop::is_policy_open]} {
set p $::ApolTop::policy
} else {
set p NULL
}
set low_level [Apol_Widget::getLevelSelectorLevel $f.low]
$range set_low $p $low_level
if {$vars($dialog:highenable)} {
set high_level [Apol_Widget::getLevelSelectorLevel $f.high]
$range set_high $p $high_level
}
return $range
}
proc Apol_Range_Dialog::_okay {dialog} {
set range [_get_range $dialog]
if {![ApolTop::is_policy_open] || [$range validate $::ApolTop::policy] != 1} {
tk_messageBox -icon error -type ok -title "Invalid Range" \
-message "The selected range is not valid. The high level does not dominate the low level."
} else {
$dialog enddialog 0
}
$range -acquire
$range -delete
}
proc Apol_Range_Dialog::_high_enabled {dialog} {
variable vars
set f [$dialog getframe]
if {$vars($dialog:highenable)} {
$f.ll configure -text "Low level"
Apol_Widget::setLevelSelectorState $f.high 1
} else {
$f.ll configure -text "Single level"
Apol_Widget::setLevelSelectorState $f.high 0
}
}
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