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menu.tcl
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1992-08-19
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# menu.tcl --
#
# This file contains Tcl procedures used to manage Tk menus and
# menubuttons. Most of the code here is dedicated to support for
# menu traversal via the keyboard.
#
# $Header: /user6/ouster/wish/scripts/RCS/menu.tcl,v 1.11 92/08/08 14:49:55 ouster Exp $ SPRITE (Berkeley)
#
# Copyright 1992 Regents of the University of California
# Permission to use, copy, modify, and distribute this
# software and its documentation for any purpose and without
# fee is hereby granted, provided that this copyright
# notice appears in all copies. The University of California
# makes no representations about the suitability of this
# software for any purpose. It is provided "as is" without
# express or implied warranty.
#
# The procedure below is publically available. It is used to indicate
# the menus associated with a particular top-level window, for purposes
# of keyboard menu traversal. Its first argument is the path name of
# a top-level window, and any additional arguments are the path names of
# the menu buttons associated with that top-level window, in the order
# they should be traversed. If no menu buttons are named, the procedure
# returns the current list of menus for w. If a single empty string is
# supplied, then the menu list for w is cancelled. Otherwise, tk_menus
# sets the menu list for w to the menu buttons.
proc tk_menus {w args} {
global tk_priv
if {$args == ""} {
if [catch {set result [set tk_priv(menusFor$w)]}] {
return ""
}
return $result
}
if {$args == "{}"} {
catch {unset tk_priv(menusFor$w)}
return ""
}
set tk_priv(menusFor$w) $args
}
# The procedure below is publically available. It takes any number of
# arguments taht are names of widgets or classes. It sets up bindings
# for the widgets or classes so that keyboard menu traversal is possible
# when the input focus is in those widgets or classes.
proc tk_bindForTraversal args {
foreach w $args {
bind $w <Alt-KeyPress> {tk_traverseToMenu %W %A}
bind $w <F10> {tk_firstMenu %W}
}
}
# The procedure below does all of the work of posting a menu (including
# unposting any other menu that might currently be posted). The "w"
# argument is the name of the menubutton for the menu to be posted.
# Note: if $w is disabled then the procedure does nothing.
proc tk_mbPost {w} {
global tk_priv tk_strictMotif
if {[lindex [$w config -state] 4] == "disabled"} {
return
}
set cur $tk_priv(posted)
if {$cur == $w} {
return
}
if {$cur != ""} tk_mbUnpost
set tk_priv(relief) [lindex [$w config -relief] 4]
$w config -relief raised
set tk_priv(cursor) [lindex [$w config -cursor] 4]
$w config -cursor arrow
$w post
grab -global $w
set tk_priv(posted) $w
if {$tk_priv(focus) == ""} {
set tk_priv(focus) [focus]
}
set menu [lindex [$w config -menu] 4]
set tk_priv(activeBg) [lindex [$menu config -activebackground] 4]
set tk_priv(activeFg) [lindex [$menu config -activeforeground] 4]
if $tk_strictMotif {
$menu config -activebackground [lindex [$menu config -background] 4]
$menu config -activeforeground [lindex [$menu config -foreground] 4]
}
focus $menu
}
# The procedure below does all the work of unposting the menubutton that's
# currently posted. It takes no arguments.
proc tk_mbUnpost {} {
global tk_priv
if {$tk_priv(posted) != ""} {
$tk_priv(posted) config -relief $tk_priv(relief)
$tk_priv(posted) config -cursor $tk_priv(cursor)
$tk_priv(posted) config -activebackground $tk_priv(activeBg)
$tk_priv(posted) config -activeforeground $tk_priv(activeFg)
$tk_priv(posted) unpost
grab none
focus $tk_priv(focus)
set tk_priv(focus) ""
set menu [lindex [$tk_priv(posted) config -menu] 4]
$menu config -activebackground $tk_priv(activeBg)
$menu config -activeforeground $tk_priv(activeFg)
set tk_priv(posted) {}
}
}
# The procedure below is invoked to implement keyboard traversal to
# a menu button. It takes two arguments: the name of a window where
# a keystroke originated, and the ascii character that was typed.
# This procedure finds a menu bar by looking upward for a top-level
# window, then looking for a window underneath that named "menu".
# Then it searches through all the subwindows of "menu" for a menubutton
# with an underlined character matching char. If one is found, it
# posts that menu.
proc tk_traverseToMenu {w char} {
global tk_priv
if {$char == ""} {
return
}
set char [string tolower $char]
foreach mb [tk_getMenuButtons $w] {
if {[winfo class $mb] == "Menubutton"} {
set char2 [string index [lindex [$mb config -text] 4] \
[lindex [$mb config -underline] 4]]
if {[string compare $char [string tolower $char2]] == 0} {
tk_mbPost $mb
[lindex [$mb config -menu] 4] activate 0
return
}
}
}
}
# The procedure below is used to implement keyboard traversal within
# the posted menu. It takes two arguments: the name of the menu to
# be traversed within, and an ASCII character. It searches for an
# entry in the menu that has that character underlined. If such an
# entry is found, it is invoked and the menu is unposted.
proc tk_traverseWithinMenu {w char} {
if {$char == ""} {
return
}
set char [string tolower $char]
set last [$w index last]
for {set i 0} {$i <= $last} {incr i} {
if [catch {set char2 [string index \
[lindex [$w entryconfig $i -label] 4] \
[lindex [$w entryconfig $i -underline] 4]]}] {
continue
}
if {[string compare $char [string tolower $char2]] == 0} {
tk_mbUnpost
$w invoke $i
return
}
}
}
# The procedure below takes a single argument, which is the name of
# a window. It returns a list containing path names for all of the
# menu buttons associated with that window's top-level window, or an
# empty list if there are none.
proc tk_getMenuButtons w {
global tk_priv
set top [winfo toplevel $w]
if [catch {set buttons [set tk_priv(menusFor$top)]}] {
return ""
}
return $buttons
}
# The procedure below is used to traverse to the next or previous
# menu in a menu bar. It takes one argument, which is a count of
# how many menu buttons forward or backward (if negative) to move.
# If there is no posted menu then this procedure has no effect.
proc tk_nextMenu count {
global tk_priv
if {$tk_priv(posted) == ""} {
return
}
set buttons [tk_getMenuButtons $tk_priv(posted)]
set length [llength $buttons]
for {set i 0} 1 {incr i} {
if {$i >= $length} {
return
}
if {[lindex $buttons $i] == $tk_priv(posted)} {
break
}
}
incr i $count
while 1 {
while {$i < 0} {
incr i $length
}
while {$i >= $length} {
incr i -$length
}
set mb [lindex $buttons $i]
if {[lindex [$mb configure -state] 4] != "disabled"} {
break
}
incr i $count
}
tk_mbUnpost
tk_mbPost $mb
[lindex [$mb config -menu] 4] activate 0
}
# The procedure below is used to traverse to the next or previous entry
# in the posted menu. It takes one argument, which is 1 to go to the
# next entry or -1 to go to the previous entry. Disabled entries are
# skipped in this process.
proc tk_nextMenuEntry count {
global tk_priv
if {$tk_priv(posted) == ""} {
return
}
set menu [lindex [$tk_priv(posted) config -menu] 4]
set length [expr [$menu index last]+1]
set i [$menu index active]
if {$i == "none"} {
set i 0
} else {
incr i $count
}
while 1 {
while {$i < 0} {
incr i $length
}
while {$i >= $length} {
incr i -$length
}
if {[catch {$menu entryconfigure $i -state} state] == 0} {
if {[lindex $state 4] != "disabled"} {
break
}
}
incr i $count
}
$menu activate $i
}
# The procedure below invokes the active entry in the posted menu,
# if there is one. Otherwise it does nothing.
proc tk_invokeMenu {menu} {
set i [$menu index active]
if {$i != "none"} {
tk_mbUnpost
update idletasks
$menu invoke $i
}
}
# The procedure below is invoked to keyboard-traverse to the first
# menu for a given source window. The source window is passed as
# parameter.
proc tk_firstMenu w {
set mb [lindex [tk_getMenuButtons $w] 0]
if {$mb != ""} {
tk_mbPost $mb
[lindex [$mb config -menu] 4] activate 0
}
}
# The procedure below is invoked when a button-1-down event is
# received by a menu button. If the mouse is in the menu button
# then it posts the button's menu. If the mouse isn't in the
# button's menu, then it deactivates any active entry in the menu.
# Remember, event-sharing can cause this procedure to be invoked
# for two different menu buttons on the same event.
proc tk_mbButtonDown w {
global tk_priv
if {[lindex [$w config -state] 4] == "disabled"} {
return
}
if {$tk_priv(inMenuButton) == $w} {
tk_mbPost $w
}
set menu [lindex [$tk_priv(posted) config -menu] 4]
if {$tk_priv(window) != $menu} {
$menu activate none
}
}