# tearoff.tcl --

#

# This file contains procedures that implement tear-off menus.

#

# RCS: @(#) $Id: tearoff.tcl,v 1.7 2001/08/01 16:21:11 dgp 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.

#

# ::tk::TearoffMenu --

# 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 ::tk::TearOffMenu {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 {[string compare [winfo toplevel $parent] $parent] \

	    || [string equal [winfo class $parent] "Menu"]} {

	set parent [winfo parent $parent]

    }

    if {[string equal $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 {[string compare [$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 tk::Priv(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 tk::Priv(focus) %W

    }

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

    # now.

    set cmd [$w cget -tearoffcommand]

    if {[string compare $cmd ""]} {

	uplevel #0 $cmd [list $w $menu]

    }

    return $menu

}

# ::tk::MenuDup --

# 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 ::tk::MenuDup {src dst type} {

    set cmd [list menu $dst -type $type]

    foreach option [$src configure] {

	if {[llength $option] == 2} {

	    continue

	}

	if {[string equal [lindex $option 0] "-type"]} {

	    continue

	}

	lappend cmd [lindex $option 0] [lindex $option 4]

    }

    eval $cmd

    set last [$src index last]

    if {[string equal $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.

    set tags [bindtags $src]

    set srcLen [string length $src]

    # Copy tags to x, replacing each substring of src with dst.

    while {[set index [string first $src $tags]] != -1} {

	append x [string range $tags 0 [expr {$index - 1}]]$dst

	set tags [string range $tags [expr {$index + $srcLen}] end]

    }

    append x $tags

    bindtags $dst $x

    foreach event [bind $src] {

	unset x

	set script [bind $src $event]

	set eventLen [string length $event]

	# Copy script to x, replacing each substring of event with dst.

	while {[set index [string first $event $script]] != -1} {

	    append x [string range $script 0 [expr {$index - 1}]]

	    append x $dst

	    set script [string range $script [expr {$index + $eventLen}] end]

	}

	append x $script

	bind $dst $event $x

    }

}