'\"
'\" 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.
'\"
'\" RCS: $Id: Toplevel.n,v 1.3 1998/08/11 14:40:53 welch Exp $
'\"
.so man.macros
.TH Toplevel n 3.0 itk "[incr\ Tk]"
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
Toplevel \- base class for mega-widgets in a top-level window
.SH "INHERITANCE"
itk::Archetype <- itk::Toplevel
.SH "STANDARD OPTIONS"
.LP
.nf
.ta 4c 8c 12c
\fBbackground\fR	\fBcursor\fR
.fi
.LP
See the "options" manual entry for details on the standard options.
.SH "WIDGET-SPECIFIC OPTIONS"
.LP
.nf
Name:   \fBtitle\fR
Class:  \fBTitle\fR
Command-Line Switch:    \fB-title\fR
.fi
.IP
Sets the title that the window manager displays in the title bar
above the window.  The default title is the null string.
.BE

.SH DESCRIPTION
.PP
The \fBToplevel\fR class inherits everything from the \fBArchetype\fR
class, and adds a Tk toplevel called the "hull" component to represent
the body of the mega-widget.  The window class name for the hull
is set to the most-specific class name for the mega-widget.
The protected variable \fBitk_interior\fR contains the window
path name for the "hull" component.  Derived classes specialize
this widget by packing other widget components into the hull.
.PP
Since the hull for the \fBToplevel\fR class is implemented with
a Tk toplevel, mega-widgets in the \fBToplevel\fR class have
their own toplevel window.  This class is used to create dialog
boxes and other pop-up windows.

.SH "COMPONENTS"
.LP
.nf
Name:	\fBhull\fR
Class:	\fBToplevel\fR
.fi
.IP
The "hull" component acts as the body for the entire mega-widget.
Other components are packed into the hull to further specialize
the widget.

.SH EXAMPLE
.PP
The following example implements a \fBMessageInfo\fR
mega-widget.  It creates a pop-up message that the
user can dismiss by pushing the "Dismiss" button.
.CS
option add *MessageInfo.title "Notice" widgetDefault

class MessageInfo {
    inherit itk::Toplevel

    constructor {args} {
        itk_component add dismiss {
            button $itk_interior.dismiss -text "Dismiss" \
                -command "destroy $itk_component(hull)"
        }
        pack $itk_component(dismiss) -side bottom -pady 4

        itk_component add separator {
            frame $itk_interior.sep -height 2 -borderwidth 1 -relief sunken
        }
        pack $itk_component(separator) -side bottom -fill x -padx 4

        itk_component add icon {
            label $itk_interior.icon -bitmap info
        }
        pack $itk_component(icon) -side left -padx 8 -pady 8

        itk_component add infoFrame {
            frame $itk_interior.info
        }
        pack $itk_component(infoFrame) -side left -expand yes \
            -fill both -padx 4 -pady 4

        itk_component add message {
            label $itk_interior.mesg -width 20
        } {
            usual
            rename -text -message message Text
        }
        pack $itk_component(message) -expand yes -fill both

        eval itk_initialize $args

        after idle [code $this centerOnScreen]
    }

    protected method centerOnScreen {} {
        update idletasks
        set wd [winfo reqwidth $itk_component(hull)]
        set ht [winfo reqheight $itk_component(hull)]
        set x [expr ([winfo screenwidth $itk_component(hull)]-$wd)/2]
        set y [expr ([winfo screenheight $itk_component(hull)]-$ht)/2]
        wm geometry $itk_component(hull) +$x+$y
    }
}

usual MessageInfo {
    keep -background -cursor -foreground -font
    keep -activebackground -activeforeground -disabledforeground
    keep -highlightcolor -highlightthickness
}

#
# EXAMPLE:  Create a notice window:
#
MessageInfo .m -message "File not found:\\n/usr/local/bin/foo"
.CE

.SH KEYWORDS
itk, Archetype, Widget, mega-widget
