share/itk3.2/Widget.itk

#
# itk::Widget
# ----------------------------------------------------------------------
# Base class for ordinary widgets in the [incr Tk] Toolkit.  Creates
# a frame to contain the widget.  Derived classes add widgets and
# methods to specialize behavior.
#
#   METHODS:
#
#   WIDGET ATTRIBUTES:
#     switch:  -background .... normal background color for widget
#       name:  background
#      class:  Background
#
#     switch:  -cursor ........ cursor used when pointer is inside
#       name:  cursur           widget
#      class:  Cursur
#
# ----------------------------------------------------------------------
#   AUTHOR:  Michael J. McLennan
#            Bell Labs Innovations for Lucent Technologies
#            mmclennan@lucent.com
#            http://www.tcltk.com/itcl
#
#      RCS:  $Id: Widget.itk,v 1.1 1998/07/27 18:45:28 stanton Exp $
# ----------------------------------------------------------------------
#            Copyright (c) 1993-1998  Lucent Technologies, Inc.
# ======================================================================
# See the file "license.terms" for information on usage and
# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.

itcl::class itk::Widget {
    inherit itk::Archetype

    # ------------------------------------------------------------------
    #  CONSTRUCTOR
    # ------------------------------------------------------------------
    constructor {args} {
        #
        #  Create a window with the same name as this object
        #
        set itk_hull [namespace tail $this]
        set itk_interior $itk_hull

        itk_component add hull {
            frame $itk_hull -class [namespace tail [info class]]
        } {
            keep -background -cursor
        }
        bind itk-delete-$itk_hull <Destroy> "itcl::delete object $this"

        set tags [bindtags $itk_hull]
        bindtags $itk_hull [linsert $tags 0 itk-delete-$itk_hull]

        eval itk_initialize $args
    }

    destructor {
        if {[winfo exists $itk_hull]} {
            set tags [bindtags $itk_hull]
            set i [lsearch $tags itk-delete-$itk_hull]
            if {$i >= 0} {
                bindtags $itk_hull [lreplace $tags $i $i]
            }
            destroy $itk_hull
        }
    }

    private variable itk_hull ""
}