home *** CD-ROM | disk | FTP | other *** search
- #
- # 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
- }
-
-