#
# Optionmenu
# ----------------------------------------------------------------------
# Implements an option menu widget with options to manage it. 
# An option menu displays a frame containing a label and a button.
# A pop-up menu will allow for the value of the button to change. 
#
# ----------------------------------------------------------------------
#  AUTHOR:  Alfredo Jahn             Phone: (214) 519-3545
#                                    Email: ajahn@spd.dsccc.com
#                                           alfredo@wn.com
#
#  @(#) $Id: optionmenu.itk,v 1.1 2003/03/19 23:00:55 cagney 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.
# ======================================================================

#
# Default resources.
#

option add *Optionmenu.highlightThickness	1	widgetDefault
option add *Optionmenu.borderWidth		2	widgetDefault
option add *Optionmenu.labelPos			w	widgetDefault
option add *Optionmenu.labelMargin		2	widgetDefault
option add *Optionmenu.popupCursor		arrow	widgetDefault

#
# Usual options.
#
itk::usual Optionmenu {
    keep -activebackground -activeborderwidth -activeforeground \
	 -background -borderwidth -cursor -disabledforeground -font \
	 -foreground -highlightcolor -highlightthickness -labelfont \
	 -popupcursor
}

# ------------------------------------------------------------------
#                            OPTONMENU
# ------------------------------------------------------------------
itcl::class iwidgets::Optionmenu {
    inherit iwidgets::Labeledwidget
    
    constructor {args} {}
    destructor {}

    itk_option define -clicktime clickTime ClickTime 150
    itk_option define -command command Command {}
    itk_option define -cyclicon cyclicOn CyclicOn true
    itk_option define -width width Width 0
    itk_option define -font font Font -Adobe-Helvetica-Bold-R-Normal--*-120-*
    itk_option define -borderwidth borderWidth BorderWidth 2
    itk_option define -highlightthickness highlightThickness HighlightThickness 1
    itk_option define -state state State normal

    public {
      method index {index} 
      method delete {first {last {}}} 
      method disable {index} 
      method enable {args} 
      method get {{first "current"} {last ""}} 
      method insert {index string args} 
      method popupMenu {args} 
      method select {index} 
      method sort {{mode "increasing"}} 
    }

    protected {
      variable _calcSize ""  ;# non-null => _calcSize pending
    }

    private {
      method _buttonRelease {time} 
      method _getNextItem {index} 
      method _next {} 
      method _postMenu {time} 
      method _previous {} 
      method _setItem {item} 
      method _setSize {{when later}} 
      method _setitems {items} ;# Set the list of menu entries

      variable _postTime 0
      variable _items {}       ;# List of popup menu entries
      variable _numitems 0     ;# List of popup menu entries

      variable _currentItem "" ;# Active menu selection
    }
}

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

# ------------------------------------------------------------------
#                        CONSTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::constructor {args} {
    global tcl_platform

    component hull configure -highlightthickness 0

    itk_component add menuBtn {
	menubutton $itk_interior.menuBtn -relief raised -indicatoron on \
            -textvariable [itcl::scope _currentItem] -takefocus 1 \
            -menu $itk_interior.menuBtn.menu
    } {
        usual
	keep -borderwidth
        if {$tcl_platform(platform) != "unix"} {
            ignore -activebackground -activeforeground
        }
    }
    pack $itk_interior.menuBtn -fill x
    pack propagate $itk_interior no

    itk_component add popupMenu {
	menu $itk_interior.menuBtn.menu -tearoff no
    } {
	usual
	ignore -tearoff
	keep -activeborderwidth -borderwidth
	rename -cursor -popupcursor popupCursor Cursor
    }

    #
    # Bind to button release for all components.
    #
    bind $itk_component(menuBtn) <ButtonPress-1> \
	    "[itcl::code $this _postMenu %t]; break"
    bind $itk_component(menuBtn) <KeyPress-space> \
	    "[itcl::code $this _postMenu %t]; break"
    bind $itk_component(popupMenu) <ButtonRelease-1> \
	    [itcl::code $this _buttonRelease %t]

    #
    # Initialize the widget based on the command line options.
    #
    eval itk_initialize $args
}

# ------------------------------------------------------------------
#                           DESTRUCTOR
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::destructor {} {
    if {$_calcSize != ""} {after cancel $_calcSize}
}

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

# ------------------------------------------------------------------
# OPTION -clicktime
#
# Interval time (in msec) used to determine that a single mouse 
# click has occurred. Used to post menu on a quick mouse click.
# **WARNING** changing this value may cause the sigle-click 
# functionality to not work properly!
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::clicktime {}

# ------------------------------------------------------------------
# OPTION -command
#
# Specifies a command to be evaluated upon change in option menu.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::command {}

# ------------------------------------------------------------------
# OPTION -cyclicon
#
# Turns on/off the 3rd mouse button capability. This feature
# allows the right mouse button to cycle through the popup 
# menu list without poping it up. <shift>M3 cycles through
# the menu in reverse order.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::cyclicon {
    if {$itk_option(-cyclicon)} {
    	bind $itk_component(menuBtn) <3> [itcl::code $this _next]
    	bind $itk_component(menuBtn) <Shift-3> [itcl::code $this _previous]
        bind $itk_component(menuBtn) <KeyPress-Down> [itcl::code $this _next]
        bind $itk_component(menuBtn) <KeyPress-Up> [itcl::code $this _previous]
    } else {
    	bind $itk_component(menuBtn) <3> break
    	bind $itk_component(menuBtn) <Shift-3> break
        bind $itk_component(menuBtn) <KeyPress-Down> break
        bind $itk_component(menuBtn) <KeyPress-Up> break
    }
}

# ------------------------------------------------------------------
# OPTION -width
#
# Allows the menu label width to be set to a fixed size
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::width {
    _setSize
}

# ------------------------------------------------------------------
# OPTION -font
#
# Change all fonts for this widget. Also re-calculate height based
# on font size (used to line up menu items over menu button label).
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::font {
    _setSize
}

# ------------------------------------------------------------------
# OPTION -borderwidth
#
# Change borderwidth for this widget. Also re-calculate height based
# on font size (used to line up menu items over menu button label).
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::borderwidth {
    _setSize
}

# ------------------------------------------------------------------
# OPTION -highlightthickness
#
# Change highlightthickness for this widget. Also re-calculate
# height based on font size (used to line up menu items over
# menu button label).
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::highlightthickness {
    _setSize
}

# ------------------------------------------------------------------
# OPTION -state
#
# Specified one of two states for the Optionmenu: normal, or
# disabled.  If the Optionmenu is disabled, then option menu
# selection is ignored.
# ------------------------------------------------------------------
itcl::configbody iwidgets::Optionmenu::state {
    switch $itk_option(-state) {
    	normal {
            $itk_component(menuBtn) config -state normal
            $itk_component(label) config -fg $itk_option(-foreground)
    	} 
    	disabled {
            $itk_component(menuBtn) config -state disabled
            $itk_component(label) config -fg $itk_option(-disabledforeground)
    	}
    	default {
    	    error "bad state option \"$itk_option(-state)\":\
		    should be disabled or normal"
    	}
    }
}

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

# ------------------------------------------------------------------
# METHOD: index index
#
# Return the numerical index corresponding to index.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::index {index} {

    if {[regexp {(^[0-9]+$)} $index]} {
	set idx [$itk_component(popupMenu) index $index]

	if {$idx == "none"} {
	    return 0
	}
	return [expr {$index > $idx ? $_numitems : $idx}]
	
    } elseif {$index == "end"} {
	return [expr {$_numitems - 1}]
	
    } elseif {$index == "select"} {
	return [lsearch $_items $_currentItem]
	
    }

    set numValue [lsearch -glob $_items $index]

    if {$numValue == -1} {
        error "bad Optionmenu index \"$index\""
    }
    return $numValue
}

# ------------------------------------------------------------------
# METHOD: delete first ?last?
#
# Remove an item (or range of items) from the popup menu. 
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::delete {first {last {}}} {

    set first [index $first]
    set last [expr {$last != {} ? [index $last] : $first}]    
    set nextAvail $_currentItem
    
    #
    # If current item is in delete range point to next available.
    #
    if {$_numitems > 1 &&
	([lsearch -exact [lrange $_items $first $last] [get]] != -1)} {
	set nextAvail [_getNextItem $last]
    }
    
    _setitems [lreplace $_items $first $last]
    
    #
    # Make sure "nextAvail" is still in the list.
    #
    set index [lsearch -exact $_items $nextAvail]
    _setItem [expr {$index != -1 ? $nextAvail : ""}]
}

# ------------------------------------------------------------------
# METHOD: disable index
#
# Disable a menu item in the option menu.  This will prevent the user
# from being able to select this item from the menu.  This only effects
# the state of the item in the menu, in other words, should the item
# be the currently selected item, the user is responsible for 
# determining this condition and taking appropriate action.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::disable {index} {
    set index [index $index]
    $itk_component(popupMenu) entryconfigure $index -state disabled
}

# ------------------------------------------------------------------
# METHOD: enable index
#
# Enable a menu item in the option menu.  This will allow the user
# to select this item from the menu.  
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::enable {index} {
    set index [index $index]
    $itk_component(popupMenu) entryconfigure $index -state normal
}

# ------------------------------------------------------------------
# METHOD: get
#
# Returns the current menu item.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::get {{first "current"} {last ""}} {
    if {"current" == $first} {
        return $_currentItem
    }

    set first [index $first]
    if {"" == $last} {
        return [$itk_component(popupMenu) entrycget $first -label]
    }

    if {"end" == $last} {
        set last [$itk_component(popupMenu) index end]
    } else {
        set last [index $last]
    }
    set rval ""
    while {$first <= $last} {
        lappend rval [$itk_component(popupMenu) entrycget $first -label]
        incr first
    }
    return $rval
}

# ------------------------------------------------------------------
# METHOD: insert index string ?string?
#
# Insert an item in the popup menu.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::insert {index string args} {
    if {$index == "end"} {
	set index $_numitems
    } else {
	set index [index $index]
    }
    set args [linsert $args 0 $string]
    _setitems [eval linsert {$_items} $index $args]
    return ""
}

# ------------------------------------------------------------------
# METHOD: select index
#
# Select an item from the popup menu to display on the menu label
# button. 
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::select {index} {
    set index [index $index]
    if {$index > ($_numitems - 1)} {
      incr index -1 
    }
    _setItem [lindex $_items $index]
}

# ------------------------------------------------------------------
# METHOD: popupMenu
#
# Evaluates the specified args against the popup menu component
# and returns the result.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::popupMenu {args} {
    return [eval $itk_component(popupMenu) $args]	
}

# ------------------------------------------------------------------
# METHOD: sort mode
#
# Sort the current menu in either "ascending" or "descending" order.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::sort {{mode "increasing"}} {
    switch $mode {
	ascending -
	increasing {
	    _setitems [lsort -increasing $_items]
	}
	descending -
	decreasing {
	    _setitems [lsort -decreasing $_items]
	}
	default {
	    error "bad sort argument \"$mode\": should be ascending,\
		    descending, increasing, or decreasing"
	}
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _buttonRelease
#
# Display the popup menu. Menu position is calculated.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_buttonRelease {time} {
    if {(abs([expr $_postTime - $time])) <= $itk_option(-clicktime)} {
        return -code break
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _getNextItem index
#
# Allows either a string or index number to be passed in, and returns
# the next item in the list in string format. Wrap around is automatic.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_getNextItem {index} {

    if {[incr index] >= $_numitems} {
	set index 0   ;# wrap around
    }
    return [lindex $_items $index]
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _next
#
# Sets the current option label to next item in list if that item is
# not disbaled.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_next {} {
    if {$itk_option(-state) != "normal"} {
        return
    }
    set i [lsearch -exact $_items $_currentItem]
	
    for {set cnt 0} {$cnt < $_numitems} {incr cnt} {

        if {[incr i] >= $_numitems} {
            set i 0
        }
	    
        if {[$itk_component(popupMenu) entrycget $i -state] != "disabled"} {
            _setItem [lindex $_items $i]
            break
        }
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _previous
#
# Sets the current option label to previous item in list if that 
# item is not disbaled.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_previous {} {
    if {$itk_option(-state) != "normal"} {
        return
    }

    set i [lsearch -exact $_items $_currentItem]
	
    for {set cnt 0} {$cnt < $_numitems} {incr cnt} {
	set i [expr {$i - 1}]
    
	if {$i < 0} {
	    set i [expr {$_numitems - 1}]
	}

	if {[$itk_component(popupMenu) entrycget $i -state] != "disabled"} {
	    _setItem [lindex $_items $i]
	    break
	}
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _postMenu time
#
# Display the popup menu. Menu position is calculated.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_postMenu {time} {
    #
    # Don't bother to post if menu is empty.
    #
    if {[llength $_items] > 0 && $itk_option(-state) == "normal"} {
        set _postTime $time
        set itemIndex [lsearch -exact $_items $_currentItem]

        set margin [expr {$itk_option(-borderwidth) \
            + $itk_option(-highlightthickness)}]

        set x [expr {[winfo rootx $itk_component(menuBtn)] + $margin}]
        set y [expr {[winfo rooty $itk_component(menuBtn)] \
            - [$itk_component(popupMenu) yposition $itemIndex] + $margin}]

        tk_popup $itk_component(popupMenu) $x $y
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _setItem
#
# Set the menu button label to item, then dismiss the popup menu.
# Also check if item has been changed. If so, also call user-supplied
# command.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_setItem {item} {
    if {$_currentItem != $item} {
        set _currentItem $item
	if {[winfo ismapped $itk_component(hull)]} {
	    uplevel #0 $itk_option(-command)
	}
    }
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _setitems items
#
# Create a list of items available on the menu. Used to create the
# popup menu.
# ------------------------------------------------------------------
itcl::body iwidgets::Optionmenu::_setitems {items_} {

    #
    # Delete the old menu entries, and set the new list of
    # menu entries to those specified in "items_".
    #
    $itk_component(popupMenu) delete 0 last
    set _items ""
    set _numitems [llength $items_]

    #
    # Clear the menu button label.
    #
    if {$_numitems == 0} {
	_setItem ""
	return
    }

    set savedCurrentItem $_currentItem
	
    foreach opt $items_ {
        lappend _items $opt
        $itk_component(popupMenu) add command -label $opt \
            -command [itcl::code $this _setItem $opt]
    }
    set first [lindex $_items 0]
	
    #
    # Make sure "savedCurrentItem" is still in the list.
    #
    if {$first != ""} {
        set i [lsearch -exact $_items $savedCurrentItem]
	#-------------------------------------------------------------
	# BEGIN BUG FIX: csmith (Chad Smith: csmith@adc.com), 11/18/99
	#-------------------------------------------------------------
	# The previous code fragment:
	#   <select [expr {$i != -1 ? $savedCurrentItem : $first}]>
	# is faulty because of exponential numbers.  For example,
	# 2e-4 is numerically equal to 2e-04, but the string representation
	# is of course different.  As a result, the select invocation
	# fails, and an error message is printed.
	#-------------------------------------------------------------
	if {$i != -1} {
	  select $savedCurrentItem
	} else {
	  select $first
	}
	#-------------------------------------------------------------
	# END BUG FIX
	#-------------------------------------------------------------
    } else {
	_setItem ""
    }

    _setSize
}

# ------------------------------------------------------------------
# PRIVATE METHOD: _setSize ?when?
#
# Set the size of the option menu.  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::Optionmenu::_setSize {{when later}} {

    if {$when == "later"} {
	if {$_calcSize == ""} {
	    set _calcSize [after idle [itcl::code $this _setSize now]]
	}
	return
    }

    set margin [expr {2*($itk_option(-borderwidth) \
        + $itk_option(-highlightthickness))}]

    if {"0" != $itk_option(-width)} {
    	set width $itk_option(-width)
    } else {
	set width [expr {[winfo reqwidth $itk_component(popupMenu)]+$margin+20}]
    }
    set height [winfo reqheight $itk_component(menuBtn)]
    $itk_component(lwchildsite) configure -width $width -height $height

    set _calcSize ""
}
