Toplevel (n) - Linux Manuals

Toplevel: base class for mega-widgets in a top-level window

NAME

Toplevel - base class for mega-widgets in a top-level window

INHERITANCE

itk::Archetype <- itk::Toplevel

STANDARD OPTIONS

background  cursor

See the "options" manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS

Name:   title
Class:  Title
Command-Line Switch:    -title

Sets the title that the window manager displays in the title bar above the window. The default title is the null string.

DESCRIPTION

The Toplevel class inherits everything from the Archetype 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 itk_interior contains the window path name for the "hull" component. Derived classes specialize this widget by packing other widget components into the hull.

Since the hull for the Toplevel class is implemented with a Tk toplevel, mega-widgets in the Toplevel class have their own toplevel window. This class is used to create dialog boxes and other pop-up windows.

COMPONENTS

Name:   hull
Class:  Toplevel

The "hull" component acts as the body for the entire mega-widget. Other components are packed into the hull to further specialize the widget.

EXAMPLE

The following example implements a MessageInfo mega-widget. It creates a pop-up message that the user can dismiss by pushing the "Dismiss" button.

option add *MessageInfo.title "Notice" widgetDefault

itcl::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
    }
}

itk::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"

KEYWORDS

itk, Archetype, Widget, mega-widget