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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
- }
- }
-