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#
# Regexpfield
# ----------------------------------------------------------------------
# Implements a text entry widget which accepts input that matches its
# regular expression, and invalidates input which doesn't.
#
#
# ----------------------------------------------------------------------
# AUTHOR: John A. Tucker E-mail: jatucker@austin.dsccc.com
#
# ----------------------------------------------------------------------
# Copyright (c) 1995 DSC Technologies Corporation
# ======================================================================
# Permission to use, copy, modify, distribute and license this software
# and its documentation for any purpose, and without fee or written
# agreement with DSC, is hereby granted, provided that the above copyright
# notice appears in all copies and that both the copyright notice and
# warranty disclaimer below appear in supporting documentation, and that
# the names of DSC Technologies Corporation or DSC Communications
# Corporation not be used in advertising or publicity pertaining to the
# software without specific, written prior permission.
#
# DSC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NON-
# INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND THE
# AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. IN NO EVENT SHALL
# DSC BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.
# ======================================================================
#
# Usual options.
#
itk::usual Regexpfield {
keep -background -borderwidth -cursor -foreground -highlightcolor \
-highlightthickness -insertbackground -insertborderwidth \
-insertofftime -insertontime -insertwidth -labelfont \
-selectbackground -selectborderwidth -selectforeground \
-textbackground -textfont
}
# ------------------------------------------------------------------
# ENTRYFIELD
# ------------------------------------------------------------------
itcl::class iwidgets::Regexpfield {
inherit iwidgets::Labeledwidget
constructor {args} {}
itk_option define -childsitepos childSitePos Position e
itk_option define -command command Command {}
itk_option define -fixed fixed Fixed 0
itk_option define -focuscommand focusCommand Command {}
itk_option define -invalid invalid Command bell
itk_option define -regexp regexp Regexp {.*}
itk_option define -nocase nocase Nocase 0
public {
method childsite {}
method get {}
method delete {args}
method icursor {args}
method index {args}
method insert {args}
method scan {args}
method selection {args}
method xview {args}
method clear {}
}
protected {
method _focusCommand {}
method _keyPress {char sym state}
}
private {
method _peek {char}
}
}
#
# Provide a lowercased access method for the Regexpfield class.
#
proc ::iwidgets::regexpfield {pathName args} {
uplevel ::iwidgets::Regexpfield $pathName $args
}
# ------------------------------------------------------------------
# CONSTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::constructor {args} {
component hull configure -borderwidth 0
itk_component add entry {
entry $itk_interior.entry
} {
keep -borderwidth -cursor -exportselection \
-foreground -highlightcolor \
-highlightthickness -insertbackground -insertborderwidth \
-insertofftime -insertontime -insertwidth -justify \
-relief -selectbackground -selectborderwidth \
-selectforeground -show -state -textvariable -width
rename -font -textfont textFont Font
rename -highlightbackground -background background Background
rename -background -textbackground textBackground Background
}
#
# Create the child site widget.
#
itk_component add -protected efchildsite {
frame $itk_interior.efchildsite
}
set itk_interior $itk_component(efchildsite)
#
# Regexpfield instance bindings.
#
bind $itk_component(entry) <KeyPress> [itcl::code $this _keyPress %A %K %s]
bind $itk_component(entry) <FocusIn> [itcl::code $this _focusCommand]
#
# Initialize the widget based on the command line options.
#
eval itk_initialize $args
}
# ------------------------------------------------------------------
# OPTIONS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# OPTION: -command
#
# Command associated upon detection of Return key press event
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::command {}
# ------------------------------------------------------------------
# OPTION: -focuscommand
#
# Command associated upon detection of focus.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::focuscommand {}
# ------------------------------------------------------------------
# OPTION: -regexp
#
# Specify a regular expression to use in performing validation
# of the content of the entry widget.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::regexp {
}
# ------------------------------------------------------------------
# OPTION: -invalid
#
# Specify a command to executed should the current Regexpfield contents
# be proven invalid.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::invalid {}
# ------------------------------------------------------------------
# OPTION: -fixed
#
# Restrict entry to 0 (unlimited) chars. The value is the maximum
# number of chars the user may type into the field, regardles of
# field width, i.e. the field width may be 20, but the user will
# only be able to type -fixed number of characters into it (or
# unlimited if -fixed = 0).
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::fixed {
if {[regexp {[^0-9]} $itk_option(-fixed)] || \
($itk_option(-fixed) < 0)} {
error "bad fixed option \"$itk_option(-fixed)\",\
should be positive integer"
}
}
# ------------------------------------------------------------------
# OPTION: -childsitepos
#
# Specifies the position of the child site in the widget.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::childsitepos {
set parent [winfo parent $itk_component(entry)]
switch $itk_option(-childsitepos) {
n {
grid $itk_component(efchildsite) -row 0 -column 0 -sticky ew
grid $itk_component(entry) -row 1 -column 0 -sticky nsew
grid rowconfigure $parent 0 -weight 0
grid rowconfigure $parent 1 -weight 1
grid columnconfigure $parent 0 -weight 1
grid columnconfigure $parent 1 -weight 0
}
e {
grid $itk_component(efchildsite) -row 0 -column 1 -sticky ns
grid $itk_component(entry) -row 0 -column 0 -sticky nsew
grid rowconfigure $parent 0 -weight 1
grid rowconfigure $parent 1 -weight 0
grid columnconfigure $parent 0 -weight 1
grid columnconfigure $parent 1 -weight 0
}
s {
grid $itk_component(efchildsite) -row 1 -column 0 -sticky ew
grid $itk_component(entry) -row 0 -column 0 -sticky nsew
grid rowconfigure $parent 0 -weight 1
grid rowconfigure $parent 1 -weight 0
grid columnconfigure $parent 0 -weight 1
grid columnconfigure $parent 1 -weight 0
}
w {
grid $itk_component(efchildsite) -row 0 -column 0 -sticky ns
grid $itk_component(entry) -row 0 -column 1 -sticky nsew
grid rowconfigure $parent 0 -weight 1
grid rowconfigure $parent 1 -weight 0
grid columnconfigure $parent 0 -weight 0
grid columnconfigure $parent 1 -weight 1
}
default {
error "bad childsite option\
\"$itk_option(-childsitepos)\":\
should be n, e, s, or w"
}
}
}
# ------------------------------------------------------------------
# OPTION: -nocase
#
# Specifies whether or not lowercase characters can match either
# lowercase or uppercase letters in string.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Regexpfield::nocase {
switch $itk_option(-nocase) {
0 - 1 {
}
default {
error "bad nocase option \"$itk_option(-nocase)\":\
should be 0 or 1"
}
}
}
# ------------------------------------------------------------------
# METHODS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# METHOD: childsite
#
# Returns the path name of the child site widget.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::childsite {} {
return $itk_component(efchildsite)
}
# ------------------------------------------------------------------
# METHOD: get
#
# Thin wrap of the standard entry widget get method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::get {} {
return [$itk_component(entry) get]
}
# ------------------------------------------------------------------
# METHOD: delete
#
# Thin wrap of the standard entry widget delete method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::delete {args} {
return [eval $itk_component(entry) delete $args]
}
# ------------------------------------------------------------------
# METHOD: icursor
#
# Thin wrap of the standard entry widget icursor method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::icursor {args} {
return [eval $itk_component(entry) icursor $args]
}
# ------------------------------------------------------------------
# METHOD: index
#
# Thin wrap of the standard entry widget index method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::index {args} {
return [eval $itk_component(entry) index $args]
}
# ------------------------------------------------------------------
# METHOD: insert
#
# Thin wrap of the standard entry widget index method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::insert {args} {
return [eval $itk_component(entry) insert $args]
}
# ------------------------------------------------------------------
# METHOD: scan
#
# Thin wrap of the standard entry widget scan method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::scan {args} {
return [eval $itk_component(entry) scan $args]
}
# ------------------------------------------------------------------
# METHOD: selection
#
# Thin wrap of the standard entry widget selection method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::selection {args} {
return [eval $itk_component(entry) selection $args]
}
# ------------------------------------------------------------------
# METHOD: xview
#
# Thin wrap of the standard entry widget xview method.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::xview {args} {
return [eval $itk_component(entry) xview $args]
}
# ------------------------------------------------------------------
# METHOD: clear
#
# Delete the current entry contents.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::clear {} {
$itk_component(entry) delete 0 end
icursor 0
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _peek char
#
# The peek procedure returns the value of the Regexpfield with the
# char inserted at the insert position.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::_peek {char} {
set str [get]
set insertPos [index insert]
set firstPart [string range $str 0 [expr {$insertPos - 1}]]
set lastPart [string range $str $insertPos end]
append rtnVal $firstPart $char $lastPart
return $rtnVal
}
# ------------------------------------------------------------------
# PROTECTED METHOD: _focusCommand
#
# Method bound to focus event which evaluates the current command
# specified in the focuscommand option
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::_focusCommand {} {
uplevel #0 $itk_option(-focuscommand)
}
# ------------------------------------------------------------------
# PROTECTED METHOD: _keyPress
#
# Monitor the key press event checking for return keys, fixed width
# specification, and optional validation procedures.
# ------------------------------------------------------------------
itcl::body iwidgets::Regexpfield::_keyPress {char sym state} {
#
# A Return key invokes the optionally specified command option.
#
if {$sym == "Return"} {
uplevel #0 $itk_option(-command)
return -code break 1
}
#
# Tabs, BackSpace, and Delete are passed on for other bindings.
#
if {($sym == "Tab") || ($sym == "BackSpace") || ($sym == "Delete")} {
return -code continue 1
}
#
# Character is not printable or the state is greater than one which
# means a modifier was used such as a control, meta key, or control
# or meta key with numlock down.
#
if {($char == "") || \
($state == 4) || ($state == 8) || \
($state == 36) || ($state == 40)} {
return -code continue 1
}
#
# If the fixed length option is not zero, then verify that the
# current length plus one will not exceed the limit. If so then
# invoke the invalid command procedure.
#
if {$itk_option(-fixed) != 0} {
if {[string length [get]] >= $itk_option(-fixed)} {
uplevel #0 $itk_option(-invalid)
return -code break 0
}
}
set flags ""
#
# Get the new value of the Regexpfield with the char inserted at the
# insert position.
#
# If the new value doesn't match up with the pattern stored in the
# -regexp option, then the invalid procedure is called.
#
# If the value of the "-nocase" option is true, then add the
# "-nocase" flag to the list of flags.
#
set newVal [_peek $char]
if {$itk_option(-nocase)} {
set valid [::regexp -nocase -- $itk_option(-regexp) $newVal]
} else {
set valid [::regexp $itk_option(-regexp) $newVal]
}
if {!$valid} {
uplevel #0 $itk_option(-invalid)
return -code break 0
}
return -code continue 1
}