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+# tearoff.tcl --
+#
+# This file contains procedures that implement tear-off menus.
+#
+# 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 $w]
+ if {[tk windowingsystem] eq "aqua"} {
+ # Shift by height of tearoff entry minus height of window titlebar
+ catch {incr y [expr {[$w yposition 1] - 16}]}
+ # Avoid the native menu bar which sits on top of everything.
+ if {$y < 22} { set y 22 }
+ }
+ }
+
+ set parent [winfo parent $w]
+ while {[winfo toplevel $parent] ne $parent \
+ || [winfo class $parent] eq "Menu"} {
+ set parent [winfo parent $parent]
+ }
+ if {$parent eq "."} {
+ 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] ne ""} {
+ 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]
+ }
+ }
+ }
+
+ if {[tk windowingsystem] eq "win32"} {
+ # [Bug 3181181]: Find the toplevel window for the menu
+ set parent [winfo toplevel $parent]
+ while {[winfo class $parent] eq "Menu"} {
+ set parent [winfo toplevel [winfo parent $parent]]
+ }
+ wm transient $menu [winfo toplevel $parent]
+ wm attributes $menu -toolwindow 1
+ }
+
+ $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 {$cmd ne ""} {
+ 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 {[lindex $option 0] eq "-type"} {
+ continue
+ }
+ lappend cmd [lindex $option 0] [lindex $option 4]
+ }
+ eval $cmd
+ set last [$src index last]
+ if {$last eq "none"} {
+ return
+ }
+ for {set i [$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
+ }
+}