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#
# Checkbox
# ----------------------------------------------------------------------
# Implements a checkbuttonbox.  Supports adding, inserting, deleting,
# selecting, and deselecting of checkbuttons by tag and index.
#
# ----------------------------------------------------------------------
#  AUTHOR: John A. Tucker                EMAIL: jatucker@spd.dsccc.com
#
# ----------------------------------------------------------------------
#            Copyright (c) 1997 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.
# ======================================================================


#
# Use option database to override default resources of base classes.
#
option add *Checkbox.labelMargin        10      widgetDefault
option add *Checkbox.labelFont     \
      "-Adobe-Helvetica-Bold-R-Normal--*-120-*-*-*-*-*-*"  widgetDefault
option add *Checkbox.labelPos           nw      widgetDefault
option add *Checkbox.borderWidth        2       widgetDefault
option add *Checkbox.relief             groove  widgetDefault

#
# Usual options.
#
itk::usual Checkbox {
    keep -background -borderwidth -cursor -disabledforeground \
        -foreground -labelfont -selectcolor
}

# ------------------------------------------------------------------
#                            CHECKBOX
# ------------------------------------------------------------------
class iwidgets::Checkbox {
    inherit iwidgets::Labeledframe

    constructor {args} {}

    itk_option define -disabledforeground \
        disabledForeground DisabledForeground {}
    itk_option define -selectcolor selectColor Background {}
    itk_option define -command command Command {}

    public {
      method add {tag args}
      method insert {index tag args}
      method delete {index}
      method get {{index ""}}
      method index {index}
      method select {index}
      method deselect {index}
      method flash {index}
      method toggle {index}
      method buttonconfigure {index args}
  }

  private {

      method gettag {index}      ;# Get the tag of the checkbutton associated
                                 ;# with a numeric index

      variable _unique 0         ;# Unique id for choice creation.
      variable _buttons {}       ;# List of checkbutton tags.
      common buttonVar           ;# Array of checkbutton "-variables"
  }
}

#
# Provide a lowercased access method for the Checkbox class.
#
proc ::iwidgets::checkbox {pathName args} {
    uplevel ::iwidgets::Checkbox $pathName $args
}

# ------------------------------------------------------------------
#                        CONSTRUCTOR
# ------------------------------------------------------------------
body iwidgets::Checkbox::constructor {args} {

    eval itk_initialize $args
}

# ------------------------------------------------------------------
#                            OPTIONS
# ------------------------------------------------------------------

# ------------------------------------------------------------------
# OPTION: -command
#
# Specifies a command to be evaluated upon change in the checkbox
# ------------------------------------------------------------------
configbody iwidgets::Checkbox::command {}

# ------------------------------------------------------------------
#                            METHODS
# ------------------------------------------------------------------

# ------------------------------------------------------------------
# METHOD: index index
#
# Searches the checkbutton tags in the checkbox for the one with the
# requested tag, numerical index, or keyword "end".  Returns the 
# choices's numerical index if found, otherwise error.
# ------------------------------------------------------------------
body iwidgets::Checkbox::index {index} {
    if {[llength $_buttons] > 0} {
        if {[regexp {(^[0-9]+$)} $index]} {
            if {$index < [llength $_buttons]} {
                return $index
            } else {
                error "Checkbox index \"$index\" is out of range"
            }

        } elseif {$index == "end"} {
            return [expr [llength $_buttons] - 1]

        } else {
            if {[set idx [lsearch $_buttons $index]] != -1} {
                return $idx
            }

            error "bad Checkbox index \"$index\": must be number, end,\
                    or pattern"
        }

    } else {
        error "Checkbox \"$itk_component(hull)\" has no checkbuttons"
    }
}

# ------------------------------------------------------------------
# METHOD: add tag ?option value option value ...?
#
# Add a new tagged checkbutton to the checkbox at the end.  The method 
# takes additional options which are passed on to the checkbutton
# constructor.  These include most of the typical checkbutton 
# options.  The tag is returned.
# ------------------------------------------------------------------
body iwidgets::Checkbox::add {tag args} {
    itk_component add $tag {
        eval checkbutton $itk_component(childsite).cb[incr _unique] \
            -variable [list [scope buttonVar($this,$tag)]] \
            -anchor w \
            -justify left \
            -highlightthickness 0 \
            $args
    } { 
      usual
      ignore -highlightthickness -highlightcolor
      rename -font -labelfont labelFont Font
    }
    pack $itk_component($tag) -anchor w -padx 4

    lappend _buttons $tag

    return $tag
}

# ------------------------------------------------------------------
# METHOD: insert index tag ?option value option value ...?
#
# Insert the tagged checkbutton in the checkbox just before the 
# one given by index.  Any additional options are passed on to the
# checkbutton constructor.  These include the typical checkbutton
# options.  The tag is returned.
# ------------------------------------------------------------------
body iwidgets::Checkbox::insert {index tag args} {
    itk_component add $tag {
        eval checkbutton $itk_component(childsite).cb[incr _unique] \
            -variable [list [scope buttonVar($this,$tag)]] \
            -anchor w \
            -justify left \
            -highlightthickness 0 \
            $args
    }  { 
      usual
      ignore -highlightthickness -highlightcolor
      rename -font -labelfont labelFont Font
    }

    set index [index $index]
    set before [lindex $_buttons $index]
    set _buttons [linsert $_buttons $index $tag]

    pack $itk_component($tag) -anchor w -padx 4 -before $itk_component($before)

    return $tag
}

# ------------------------------------------------------------------
# METHOD: delete index
#
# Delete the specified checkbutton.
# ------------------------------------------------------------------
body iwidgets::Checkbox::delete {index} {

    set tag [gettag $index]
    set index [index $index]
    destroy $itk_component($tag)
    set _buttons [lreplace $_buttons $index $index]

    if { [info exists buttonVar($this,$tag)] == 1 } {
        unset buttonVar($this,$tag)
    }
}

# ------------------------------------------------------------------
# METHOD: select index
#
# Select the specified checkbutton.
# ------------------------------------------------------------------
body iwidgets::Checkbox::select {index} {
    set tag [gettag $index]
    $itk_component($tag) invoke
}

# ------------------------------------------------------------------
# METHOD: toggle index
#
# Toggle a specified checkbutton between selected and unselected
# ------------------------------------------------------------------
body iwidgets::Checkbox::toggle {index} {
    set tag [gettag $index]
    $itk_component($tag) toggle
}

# ------------------------------------------------------------------
# METHOD: get
#
# Return the value of the checkbutton with the given index, or a
# list of all checkbutton values in increasing order by index.
# ------------------------------------------------------------------
body iwidgets::Checkbox::get {{index ""}} {
    set result {}

    if {$index == ""} {
        foreach tag $_buttons {
            if {$buttonVar($this,$tag)} {
                lappend result $tag
            }
        }
    } else {
        set tag [gettag $index]
        set result $buttonVar($this,$tag)
    }

    return $result
}

# ------------------------------------------------------------------
# METHOD: deselect index
#
# Deselect the specified checkbutton.
# ------------------------------------------------------------------
body iwidgets::Checkbox::deselect {index} {
    set tag [gettag $index]
    $itk_component($tag) deselect
}

# ------------------------------------------------------------------
# METHOD: flash index
#
# Flash the specified checkbutton.
# ------------------------------------------------------------------
body iwidgets::Checkbox::flash {index} {
    set tag [gettag $index]
    $itk_component($tag) flash  
}

# ------------------------------------------------------------------
# METHOD: buttonconfigure index ?option? ?value option value ...?
#
# Configure a specified checkbutton.  This method allows configuration 
# of checkbuttons from the Checkbox level.  The options may have any 
# of the values accepted by the add method.
# ------------------------------------------------------------------
body iwidgets::Checkbox::buttonconfigure {index args} { 
    set tag [gettag $index]
    eval $itk_component($tag) configure $args
}

# ------------------------------------------------------------------
# METHOD: gettag index
#
# Return the tag of the checkbutton associated with a specified
# numeric index
# ------------------------------------------------------------------
body iwidgets::Checkbox::gettag {index} {
    return [lindex $_buttons [index $index]]
}