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#
# Selectionbox
# ----------------------------------------------------------------------
# Implements a selection box composed of a scrolled list of items and
# a selection entry field. The user may choose any of the items displayed
# in the scrolled list of alternatives and the selection field will be
# filled with the choice. The user is also free to enter a new value in
# the selection entry field. Both the list and entry areas have labels.
# A child site is also provided in which the user may create other widgets
# to be used in conjunction with the selection box.
#
# ----------------------------------------------------------------------
# AUTHOR: Mark L. Ulferts EMAIL: mulferts@austin.dsccc.com
#
# @(#) $Id: selectionbox.itk,v 1.2 2001/08/07 19:56:48 smithc Exp $
# ----------------------------------------------------------------------
# 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 Selectionbox {
keep -activebackground -activerelief -background -borderwidth -cursor \
-elementborderwidth -foreground -highlightcolor -highlightthickness \
-insertbackground -insertborderwidth -insertofftime -insertontime \
-insertwidth -jump -labelfont -selectbackground -selectborderwidth \
-selectforeground -textbackground -textfont -troughcolor
}
# ------------------------------------------------------------------
# SELECTIONBOX
# ------------------------------------------------------------------
itcl::class iwidgets::Selectionbox {
inherit itk::Widget
constructor {args} {}
destructor {}
itk_option define -childsitepos childSitePos Position center
itk_option define -margin margin Margin 7
itk_option define -itemson itemsOn ItemsOn true
itk_option define -selectionon selectionOn SelectionOn true
itk_option define -width width Width 260
itk_option define -height height Height 320
public method childsite {}
public method get {}
public method curselection {}
public method clear {component}
public method insert {component index args}
public method delete {first {last {}}}
public method size {}
public method scan {option args}
public method nearest {y}
public method index {index}
public method selection {option args}
public method selectitem {}
private method _packComponents {{when later}}
private variable _repacking {} ;# non-null => _packComponents pending
}
#
# Provide a lowercased access method for the Selectionbox class.
#
proc ::iwidgets::selectionbox {pathName args} {
uplevel ::iwidgets::Selectionbox $pathName $args
}
#
# Use option database to override default resources of base classes.
#
option add *Selectionbox.itemsLabel Items widgetDefault
option add *Selectionbox.selectionLabel Selection widgetDefault
option add *Selectionbox.width 260 widgetDefault
option add *Selectionbox.height 320 widgetDefault
# ------------------------------------------------------------------
# CONSTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::constructor {args} {
#
# Set the borderwidth to zero and add width and height options
# back to the hull.
#
component hull configure -borderwidth 0
itk_option add hull.width hull.height
#
# Create the child site widget.
#
itk_component add -protected sbchildsite {
frame $itk_interior.sbchildsite
}
#
# Create the items list.
#
itk_component add items {
iwidgets::Scrolledlistbox $itk_interior.items -selectmode single \
-visibleitems 20x10 -labelpos nw -vscrollmode static \
-hscrollmode none
} {
usual
keep -dblclickcommand -exportselection
rename -labeltext -itemslabel itemsLabel Text
rename -selectioncommand -itemscommand itemsCommand Command
}
configure -itemscommand [itcl::code $this selectitem]
#
# Create the selection entry.
#
itk_component add selection {
iwidgets::Entryfield $itk_interior.selection -labelpos nw
} {
usual
keep -exportselection
rename -labeltext -selectionlabel selectionLabel Text
rename -command -selectioncommand selectionCommand Command
}
#
# Set the interior to the childsite for derived classes.
#
set itk_interior $itk_component(sbchildsite)
#
# Initialize the widget based on the command line options.
#
eval itk_initialize $args
#
# When idle, pack the components.
#
_packComponents
}
# ------------------------------------------------------------------
# DESTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::destructor {} {
if {$_repacking != ""} {after cancel $_repacking}
}
# ------------------------------------------------------------------
# OPTIONS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# OPTION: -childsitepos
#
# Specifies the position of the child site in the selection box.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::childsitepos {
_packComponents
}
# ------------------------------------------------------------------
# OPTION: -margin
#
# Specifies distance between the items list and selection entry.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::margin {
_packComponents
}
# ------------------------------------------------------------------
# OPTION: -itemson
#
# Specifies whether or not to display the items list.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::itemson {
_packComponents
}
# ------------------------------------------------------------------
# OPTION: -selectionon
#
# Specifies whether or not to display the selection entry widget.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::selectionon {
_packComponents
}
# ------------------------------------------------------------------
# OPTION: -width
#
# Specifies the width of the hull. The value may be specified in
# any of the forms acceptable to Tk_GetPixels. A value of zero
# causes the width to be adjusted to the required value based on
# the size requests of the components. Otherwise, the width is
# fixed.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::width {
#
# The width option was added to the hull in the constructor.
# So, any width value given is passed automatically to the
# hull. All we have to do is play with the propagation.
#
if {$itk_option(-width) != 0} {
set propagate 0
} else {
set propagate 1
}
#
# Due to a bug in the tk4.2 grid, we have to check the
# propagation before setting it. Setting it to the same
# value it already is will cause it to toggle.
#
if {[grid propagate $itk_component(hull)] != $propagate} {
grid propagate $itk_component(hull) $propagate
}
}
# ------------------------------------------------------------------
# OPTION: -height
#
# Specifies the height of the hull. The value may be specified in
# any of the forms acceptable to Tk_GetPixels. A value of zero
# causes the height to be adjusted to the required value based on
# the size requests of the components. Otherwise, the height is
# fixed.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Selectionbox::height {
#
# The height option was added to the hull in the constructor.
# So, any height value given is passed automatically to the
# hull. All we have to do is play with the propagation.
#
if {$itk_option(-height) != 0} {
set propagate 0
} else {
set propagate 1
}
#
# Due to a bug in the tk4.2 grid, we have to check the
# propagation before setting it. Setting it to the same
# value it already is will cause it to toggle.
#
if {[grid propagate $itk_component(hull)] != $propagate} {
grid propagate $itk_component(hull) $propagate
}
}
# ------------------------------------------------------------------
# METHODS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# METHOD: childsite
#
# Returns the path name of the child site widget.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::childsite {} {
return $itk_component(sbchildsite)
}
# ------------------------------------------------------------------
# METHOD: get
#
# Returns the current selection.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::get {} {
return [$itk_component(selection) get]
}
# ------------------------------------------------------------------
# METHOD: curselection
#
# Returns the current selection index.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::curselection {} {
return [$itk_component(items) curselection]
}
# ------------------------------------------------------------------
# METHOD: clear component
#
# Delete the contents of either the selection entry widget or items
# list.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::clear {component} {
switch $component {
selection {
$itk_component(selection) clear
}
items {
delete 0 end
}
default {
error "bad clear argument \"$component\": should be\
selection or items"
}
}
}
# ------------------------------------------------------------------
# METHOD: insert component index args
#
# Insert element(s) into either the selection or items list widget.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::insert {component index args} {
switch $component {
selection {
eval $itk_component(selection) insert $index $args
}
items {
eval $itk_component(items) insert $index $args
}
default {
error "bad insert argument \"$component\": should be\
selection or items"
}
}
}
# ------------------------------------------------------------------
# METHOD: delete first ?last?
#
# Delete one or more elements from the items list box. The default
# is to delete by indexed range. If an item is to be removed by name,
# it must be preceeded by the keyword "item". Only index numbers can
# be used to delete a range of items.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::delete {first {last {}}} {
set first [index $first]
if {$last != {}} {
set last [index $last]
} else {
set last $first
}
if {$first <= $last} {
eval $itk_component(items) delete $first $last
} else {
error "first index must not be greater than second"
}
}
# ------------------------------------------------------------------
# METHOD: size
#
# Returns a decimal string indicating the total number of elements
# in the items list.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::size {} {
return [$itk_component(items) size]
}
# ------------------------------------------------------------------
# METHOD: scan option args
#
# Implements scanning on items list.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::scan {option args} {
eval $itk_component(items) scan $option $args
}
# ------------------------------------------------------------------
# METHOD: nearest y
#
# Returns the index to the nearest listbox item given a y coordinate.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::nearest {y} {
return [$itk_component(items) nearest $y]
}
# ------------------------------------------------------------------
# METHOD: index index
#
# Returns the decimal string giving the integer index corresponding
# to index.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::index {index} {
return [$itk_component(items) index $index]
}
# ------------------------------------------------------------------
# METHOD: selection option args
#
# Adjusts the selection within the items list.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::selection {option args} {
eval $itk_component(items) selection $option $args
selectitem
}
# ------------------------------------------------------------------
# METHOD: selectitem
#
# Replace the selection entry field contents with the currently
# selected items value.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::selectitem {} {
$itk_component(selection) clear
set numSelected [$itk_component(items) selecteditemcount]
if {$numSelected == 1} {
$itk_component(selection) insert end \
[$itk_component(items) getcurselection]
} elseif {$numSelected > 1} {
$itk_component(selection) insert end \
[lindex [$itk_component(items) getcurselection] 0]
}
$itk_component(selection) icursor end
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _packComponents ?when?
#
# Pack the selection, items, and child site widgets based on options.
# If "when" is "now", the change is applied immediately. If it is
# "later" or it is not specified, then the change is applied later,
# when the application is idle.
# ------------------------------------------------------------------
itcl::body iwidgets::Selectionbox::_packComponents {{when later}} {
if {$when == "later"} {
if {$_repacking == ""} {
set _repacking [after idle [itcl::code $this _packComponents now]]
}
return
} elseif {$when != "now"} {
error "bad option \"$when\": should be now or later"
}
set _repacking ""
set parent [winfo parent $itk_component(sbchildsite)]
set margin [winfo pixels $itk_component(hull) $itk_option(-margin)]
switch $itk_option(-childsitepos) {
n {
grid $itk_component(sbchildsite) -row 0 -column 0 \
-sticky nsew -rowspan 1
grid $itk_component(items) -row 1 -column 0 -sticky nsew
grid $itk_component(selection) -row 3 -column 0 -sticky ew
grid rowconfigure $parent 0 -weight 0 -minsize 0
grid rowconfigure $parent 1 -weight 1 -minsize 0
grid rowconfigure $parent 2 -weight 0 -minsize $margin
grid rowconfigure $parent 3 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
}
w {
grid $itk_component(sbchildsite) -row 0 -column 0 \
-sticky nsew -rowspan 3
grid $itk_component(items) -row 0 -column 1 -sticky nsew
grid $itk_component(selection) -row 2 -column 1 -sticky ew
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize $margin
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid rowconfigure $parent 3 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 0 -minsize 0
grid columnconfigure $parent 1 -weight 1 -minsize 0
}
s {
grid $itk_component(items) -row 0 -column 0 -sticky nsew
grid $itk_component(selection) -row 2 -column 0 -sticky ew
grid $itk_component(sbchildsite) -row 3 -column 0 \
-sticky nsew -rowspan 1
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize $margin
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid rowconfigure $parent 3 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
}
e {
grid $itk_component(items) -row 0 -column 0 -sticky nsew
grid $itk_component(selection) -row 2 -column 0 -sticky ew
grid $itk_component(sbchildsite) -row 0 -column 1 \
-sticky nsew -rowspan 3
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize $margin
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid rowconfigure $parent 3 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
}
center {
grid $itk_component(items) -row 0 -column 0 -sticky nsew
grid $itk_component(sbchildsite) -row 1 -column 0 \
-sticky nsew -rowspan 1
grid $itk_component(selection) -row 3 -column 0 -sticky ew
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize 0
grid rowconfigure $parent 2 -weight 0 -minsize $margin
grid rowconfigure $parent 3 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
}
default {
error "bad childsitepos option \"$itk_option(-childsitepos)\":\
should be n, e, s, w, or center"
}
}
if {$itk_option(-itemson)} {
} else {
grid forget $itk_component(items)
}
if {$itk_option(-selectionon)} {
} else {
grid forget $itk_component(selection)
}
raise $itk_component(sbchildsite)
}