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#
# Labeledwidget
# ----------------------------------------------------------------------
# Implements a labeled widget which contains a label and child site.
# The child site is a frame which can filled with any widget via a
# derived class or though the use of the childsite method. This class
# was designed to be a general purpose base class for supporting the
# combination of label widget and a childsite, where a label may be
# text, bitmap or image. The options include the ability to position
# the label around the childsite widget, modify the font and margin,
# and control the display of the label.
#
# ----------------------------------------------------------------------
# AUTHOR: Mark L. Ulferts EMAIL: mulferts@austin.dsccc.com
#
# @(#) $Id: labeledwidget.itk,v 1.4 2001/08/20 20:02:53 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 Labeledwidget {
keep -background -cursor -foreground -labelfont
}
# ------------------------------------------------------------------
# LABELEDWIDGET
# ------------------------------------------------------------------
itcl::class iwidgets::Labeledwidget {
inherit itk::Widget
constructor {args} {}
destructor {}
itk_option define -disabledforeground disabledForeground \
DisabledForeground \#a3a3a3
itk_option define -labelpos labelPos Position w
itk_option define -labelmargin labelMargin Margin 2
itk_option define -labeltext labelText Text {}
itk_option define -labelvariable labelVariable Variable {}
itk_option define -labelbitmap labelBitmap Bitmap {}
itk_option define -labelimage labelImage Image {}
itk_option define -state state State normal
itk_option define -sticky sticky Sticky nsew
public method childsite
private method _positionLabel {{when later}}
proc alignlabels {args} {}
protected variable _reposition "" ;# non-null => _positionLabel pending
}
#
# Provide a lowercased access method for the Labeledwidget class.
#
proc ::iwidgets::labeledwidget {pathName args} {
uplevel ::iwidgets::Labeledwidget $pathName $args
}
# ------------------------------------------------------------------
# CONSTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Labeledwidget::constructor {args} {
#
# Create a frame for the childsite widget.
#
itk_component add -protected lwchildsite {
frame $itk_interior.lwchildsite
}
#
# Create label.
#
itk_component add label {
label $itk_interior.label
} {
usual
rename -font -labelfont labelFont Font
ignore -highlightcolor -highlightthickness
}
#
# Set the interior to be the childsite for derived classes.
#
set itk_interior $itk_component(lwchildsite)
#
# Initialize the widget based on the command line options.
#
eval itk_initialize $args
#
# When idle, position the label.
#
_positionLabel
}
# ------------------------------------------------------------------
# DESTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Labeledwidget::destructor {} {
if {$_reposition != ""} {after cancel $_reposition}
}
# ------------------------------------------------------------------
# OPTIONS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# OPTION: -disabledforeground
#
# Specified the foreground to be used on the label when disabled.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::disabledforeground {}
# ------------------------------------------------------------------
# OPTION: -labelpos
#
# Set the position of the label on the labeled widget. The margin
# between the label and childsite comes along for the ride.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labelpos {
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -labelmargin
#
# Specifies the distance between the widget and label.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labelmargin {
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -labeltext
#
# Specifies the label text.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labeltext {
$itk_component(label) configure -text $itk_option(-labeltext)
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -labelvariable
#
# Specifies the label text variable.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labelvariable {
$itk_component(label) configure -textvariable $itk_option(-labelvariable)
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -labelbitmap
#
# Specifies the label bitmap.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labelbitmap {
$itk_component(label) configure -bitmap $itk_option(-labelbitmap)
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -labelimage
#
# Specifies the label image.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::labelimage {
$itk_component(label) configure -image $itk_option(-labelimage)
_positionLabel
}
# ------------------------------------------------------------------
# OPTION: -sticky
#
# Specifies the stickyness of the child site. This option was added
# by James Bonfield (committed by Chad Smith 8/20/01).
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::sticky {
grid $itk_component(lwchildsite) -sticky $itk_option(-sticky)
}
# ------------------------------------------------------------------
# OPTION: -state
#
# Specifies the state of the label.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Labeledwidget::state {
_positionLabel
}
# ------------------------------------------------------------------
# METHODS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# METHOD: childsite
#
# Returns the path name of the child site widget.
# ------------------------------------------------------------------
itcl::body iwidgets::Labeledwidget::childsite {} {
return $itk_component(lwchildsite)
}
# ------------------------------------------------------------------
# PROCEDURE: alignlabels widget ?widget ...?
#
# The alignlabels procedure takes a list of widgets derived from
# the Labeledwidget class and adjusts the label margin to align
# the labels.
# ------------------------------------------------------------------
itcl::body iwidgets::Labeledwidget::alignlabels {args} {
update
set maxLabelWidth 0
#
# Verify that all the widgets are of type Labeledwidget and
# determine the size of the maximum length label string.
#
foreach iwid $args {
set objcmd [itcl::find objects -isa Labeledwidget *::$iwid]
if {$objcmd == ""} {
error "$iwid is not a \"Labeledwidget\""
}
set csWidth [winfo reqwidth $iwid.lwchildsite]
set shellWidth [winfo reqwidth $iwid]
if {($shellWidth - $csWidth) > $maxLabelWidth} {
set maxLabelWidth [expr {$shellWidth - $csWidth}]
}
}
#
# Adjust the margins for the labels such that the child sites and
# labels line up.
#
foreach iwid $args {
set csWidth [winfo reqwidth $iwid.lwchildsite]
set shellWidth [winfo reqwidth $iwid]
set labelSize [expr {$shellWidth - $csWidth}]
if {$maxLabelWidth > $labelSize} {
set objcmd [itcl::find objects -isa Labeledwidget *::$iwid]
set dist [expr {$maxLabelWidth - \
($labelSize - [$objcmd cget -labelmargin])}]
$objcmd configure -labelmargin $dist
}
}
}
# ------------------------------------------------------------------
# PROTECTED METHOD: _positionLabel ?when?
#
# Packs the label and label margin. If "when" is "now", the
# change is applied immediately. If it is "later" or it is not
# specified, then the change is applied later, when the application
# is idle.
# ------------------------------------------------------------------
itcl::body iwidgets::Labeledwidget::_positionLabel {{when later}} {
if {$when == "later"} {
if {$_reposition == ""} {
set _reposition [after idle [itcl::code $this _positionLabel now]]
}
return
} elseif {$when != "now"} {
error "bad option \"$when\": should be now or later"
}
#
# If we have a label, be it text, bitmap, or image continue.
#
if {($itk_option(-labeltext) != {}) || \
($itk_option(-labelbitmap) != {}) || \
($itk_option(-labelimage) != {}) || \
($itk_option(-labelvariable) != {})} {
#
# Set the foreground color based on the state.
#
if {[info exists itk_option(-state)]} {
switch -- $itk_option(-state) {
disabled {
$itk_component(label) configure \
-foreground $itk_option(-disabledforeground)
}
normal {
$itk_component(label) configure \
-foreground $itk_option(-foreground)
}
}
}
set parent [winfo parent $itk_component(lwchildsite)]
#
# Switch on the label position option. Using the grid,
# adjust the row/column setting of the label, margin, and
# and childsite. The margin height/width is adjust based
# on the orientation as well. Finally, set the weights such
# that the childsite takes the heat on expansion and shrinkage.
#
switch $itk_option(-labelpos) {
nw -
n -
ne {
grid $itk_component(label) -row 0 -column 0 \
-sticky $itk_option(-labelpos)
grid $itk_component(lwchildsite) -row 2 -column 0 \
-sticky $itk_option(-sticky)
grid rowconfigure $parent 0 -weight 0 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize \
[winfo pixels $itk_component(label) \
$itk_option(-labelmargin)]
grid rowconfigure $parent 2 -weight 1 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
grid columnconfigure $parent 2 -weight 0 -minsize 0
}
en -
e -
es {
grid $itk_component(lwchildsite) -row 0 -column 0 \
-sticky $itk_option(-sticky)
grid $itk_component(label) -row 0 -column 2 \
-sticky $itk_option(-labelpos)
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize 0
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize \
[winfo pixels $itk_component(label) \
$itk_option(-labelmargin)]
grid columnconfigure $parent 2 -weight 0 -minsize 0
}
se -
s -
sw {
grid $itk_component(lwchildsite) -row 0 -column 0 \
-sticky $itk_option(-sticky)
grid $itk_component(label) -row 2 -column 0 \
-sticky $itk_option(-labelpos)
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize \
[winfo pixels $itk_component(label) \
$itk_option(-labelmargin)]
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
grid columnconfigure $parent 2 -weight 0 -minsize 0
}
wn -
w -
ws {
grid $itk_component(lwchildsite) -row 0 -column 2 \
-sticky $itk_option(-sticky)
grid $itk_component(label) -row 0 -column 0 \
-sticky $itk_option(-labelpos)
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize 0
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 0 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize \
[winfo pixels $itk_component(label) \
$itk_option(-labelmargin)]
grid columnconfigure $parent 2 -weight 1 -minsize 0
}
default {
error "bad labelpos option\
\"$itk_option(-labelpos)\": should be\
nw, n, ne, sw, s, se, en, e, es, wn, w, or ws"
}
}
#
# Else, neither the label text, bitmap, or image have a value, so
# forget them so they don't appear and manage only the childsite.
#
} else {
grid forget $itk_component(label)
grid $itk_component(lwchildsite) -row 0 -column 0 -sticky $itk_option(-sticky)
set parent [winfo parent $itk_component(lwchildsite)]
grid rowconfigure $parent 0 -weight 1 -minsize 0
grid rowconfigure $parent 1 -weight 0 -minsize 0
grid rowconfigure $parent 2 -weight 0 -minsize 0
grid columnconfigure $parent 0 -weight 1 -minsize 0
grid columnconfigure $parent 1 -weight 0 -minsize 0
grid columnconfigure $parent 2 -weight 0 -minsize 0
}
#
# Reset the resposition flag.
#
set _reposition ""
}