tearoff.tcl

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# tearoff.tcl --
#
# This file contains procedures that implement tear-off menus.
#
# RCS: @(#) $Id: tearoff.tcl,v 1.3 1998/09/14 18:23:25 stanton Exp $
#
# Copyright (c) 1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

# tkTearoffMenu --
# Given the name of a menu, this procedure creates a torn-off menu
# that is identical to the given menu (including nested submenus).
# The new torn-off menu exists as a toplevel window managed by the
# window manager.  The return value is the name of the new menu.
# The window is created at the point specified by x and y
#
# Arguments:
# w -			The menu to be torn-off (duplicated).
# x -			x coordinate where window is created
# y -			y coordinate where window is created

proc tkTearOffMenu {w {x 0} {y 0}} {
    # Find a unique name to use for the torn-off menu.  Find the first
    # ancestor of w that is a toplevel but not a menu, and use this as
    # the parent of the new menu.  This guarantees that the torn off
    # menu will be on the same screen as the original menu.  By making
    # it a child of the ancestor, rather than a child of the menu, it
    # can continue to live even if the menu is deleted;  it will go
    # away when the toplevel goes away.

    if {$x == 0} {
    	set x [winfo rootx $w]
    }
    if {$y == 0} {
    	set y [winfo rooty $w]
    }

    set parent [winfo parent $w]
    while {([winfo toplevel $parent] != $parent)
	    || ([winfo class $parent] == "Menu")} {
	set parent [winfo parent $parent]
    }
    if {$parent == "."} {
	set parent ""
    }
    for {set i 1} 1 {incr i} {
	set menu $parent.tearoff$i
	if {![winfo exists $menu]} {
	    break
	}
    }

    $w clone $menu tearoff

    # Pick a title for the new menu by looking at the parent of the
    # original: if the parent is a menu, then use the text of the active
    # entry.  If it's a menubutton then use its text.

    set parent [winfo parent $w]
    if {[$menu cget -title] != ""} {
    	wm title $menu [$menu cget -title]
    } else {
    	switch [winfo class $parent] {
	    Menubutton {
	    	wm title $menu [$parent cget -text]
	    }
	    Menu {
	    	wm title $menu [$parent entrycget active -label]
	    }
	}
    }

    $menu post $x $y

    if {[winfo exists $menu] == 0} {
	return ""
    }

    # Set tkPriv(focus) on entry:  otherwise the focus will get lost
    # after keyboard invocation of a sub-menu (it will stay on the
    # submenu).

    bind $menu <Enter> {
	set tkPriv(focus) %W
    }

    # If there is a -tearoffcommand option for the menu, invoke it
    # now.

    set cmd [$w cget -tearoffcommand]
    if {$cmd != ""} {
	uplevel #0 $cmd $w $menu
    }
    return $menu
}

# tkMenuDup --
# Given a menu (hierarchy), create a duplicate menu (hierarchy)
# in a given window.
#
# Arguments:
# src -			Source window.  Must be a menu.  It and its
#			menu descendants will be duplicated at dst.
# dst -			Name to use for topmost menu in duplicate
#			hierarchy.

proc tkMenuDup {src dst type} {
    set cmd [list menu $dst -type $type]
    foreach option [$src configure] {
	if {[llength $option] == 2} {
	    continue
	}
	if {[string compare [lindex $option 0] "-type"] == 0} {
	    continue
	}
	lappend cmd [lindex $option 0] [lindex $option 4]
    }
    eval $cmd
    set last [$src index last]
    if {$last == "none"} {
	return
    }
    for {set i [$src cget -tearoff]} {$i <= $last} {incr i} {
	set cmd [list $dst add [$src type $i]]
	foreach option [$src entryconfigure $i]  {
	    lappend cmd [lindex $option 0] [lindex $option 4]
	}
	eval $cmd
    }

    # Duplicate the binding tags and bindings from the source menu.

    regsub -all . $src {\\&} quotedSrc
    regsub -all . $dst {\\&} quotedDst
    regsub -all $quotedSrc [bindtags $src] $dst x
    bindtags $dst $x
    foreach event [bind $src] {
	regsub -all $quotedSrc [bind $src $event] $dst x
	bind $dst $event $x
    }
}