353 lines
11 KiB
Tcl
353 lines
11 KiB
Tcl
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# menu.tcl --
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#
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# This file contains Tcl procedures used to manage Tk menus and
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# menubuttons. Most of the code here is dedicated to support for
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# pulling down menus and menu traversal via the keyboard.
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#
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# $Header: /user6/ouster/wish/library/RCS/menu.tcl,v 1.23 93/09/17 14:02:28 ouster Exp $ SPRITE (Berkeley)
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#
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# Copyright (c) 1992-1993 The Regents of the University of California.
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# All rights reserved.
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#
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# Permission is hereby granted, without written agreement and without
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# license or royalty fees, to use, copy, modify, and distribute this
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# software and its documentation for any purpose, provided that the
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# above copyright notice and the following two paragraphs appear in
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# all copies of this software.
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#
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# IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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# OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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# CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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# ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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# PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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#
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# The procedure below is publically available. It is used to identify
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# a frame that serves as a menu bar and the menu buttons that lie inside
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# the menu bar. This procedure establishes proper "menu bar" behavior
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# for all of the menu buttons, including keyboard menu traversal. Only
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# one menu bar may exist for a given top-level window at a time.
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# Arguments:
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#
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# bar - The path name of the containing frame. Must
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# be an ancestor of all of the menu buttons,
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# since it will be be used in grabs.
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# additional arguments - One or more menu buttons that are descendants
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# of bar. The order of these arguments
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# determines the order of keyboard traversal.
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# If no extra arguments are named then all of
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# the menu bar information for bar is cancelled.
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proc tk_menuBar {w args} {
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global tk_priv
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if {$args == ""} {
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if [catch {set menus $tk_priv(menusFor$w)}] {
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return ""
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}
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return $menus
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}
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if [info exists tk_priv(menusFor$w)] {
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unset tk_priv(menusFor$w)
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unset tk_priv(menuBarFor[winfo toplevel $w])
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}
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if {$args == "{}"} {
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return
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}
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set tk_priv(menusFor$w) $args
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set tk_priv(menuBarFor[winfo toplevel $w]) $w
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bind $w <Any-Alt-KeyPress> {tk_traverseToMenu %W %A}
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bind $w <F10> {tk_firstMenu %W}
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bind $w <Any-ButtonRelease-1> tk_mbUnpost
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}
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proc tk_menus {w args} {
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error "tk_menus is obsolete in Tk versions 3.0 and later; please change your scripts to use tk_menuBar instead"
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}
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# The procedure below is publically available. It takes any number of
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# arguments that are names of widgets or classes. It sets up bindings
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# for the widgets or classes so that keyboard menu traversal is possible
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# when the input focus is in those widgets or classes.
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proc tk_bindForTraversal args {
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foreach w $args {
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bind $w <Any-Alt-KeyPress> {tk_traverseToMenu %W %A}
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bind $w <F10> {tk_firstMenu %W}
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}
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}
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# The procedure below does all of the work of posting a menu (including
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# unposting any other menu that might currently be posted). The "w"
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# argument is the name of the menubutton for the menu to be posted.
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# Note: if $w is disabled then the procedure does nothing.
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proc tk_mbPost {w} {
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global tk_priv tk_strictMotif
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if {[lindex [$w config -state] 4] == "disabled"} {
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return
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}
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if {$w == $tk_priv(posted)} {
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grab -global $tk_priv(grab)
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return
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}
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set menu [lindex [$w config -menu] 4]
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if {$menu == ""} {
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return
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}
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if ![string match $w* $menu] {
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error "can't post $menu: it isn't a descendant of $w (this is a new requirement in Tk versions 3.0 and later)"
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}
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set cur $tk_priv(posted)
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if {$cur != ""} tk_mbUnpost
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set tk_priv(relief) [lindex [$w config -relief] 4]
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$w config -relief raised
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set tk_priv(posted) $w
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if {$tk_priv(focus) == ""} {
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set tk_priv(focus) [focus]
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}
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set tk_priv(activeBg) [lindex [$menu config -activebackground] 4]
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set tk_priv(activeFg) [lindex [$menu config -activeforeground] 4]
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if $tk_strictMotif {
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$menu config -activebackground [lindex [$menu config -background] 4]
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$menu config -activeforeground [lindex [$menu config -foreground] 4]
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}
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$menu activate none
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focus $menu
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$menu post [winfo rootx $w] [expr [winfo rooty $w]+[winfo height $w]]
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if [catch {set grab $tk_priv(menuBarFor[winfo toplevel $w])}] {
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set grab $w
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} else {
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if [lsearch $tk_priv(menusFor$grab) $w]<0 {
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set grab $w
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}
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}
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set tk_priv(cursor) [lindex [$grab config -cursor] 4]
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$grab config -cursor arrow
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set tk_priv(grab) $grab
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grab -global $grab
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}
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# The procedure below does all the work of unposting the menubutton that's
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# currently posted. It takes no arguments. Special notes:
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# 1. It's important to unpost the menu before releasing the grab, so
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# that any Enter-Leave events (e.g. from menu back to main
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# application) have mode NotifyGrab.
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# 2. Be sure to enclose various groups of commands in "catch" so that
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# the procedure will complete even if the menubutton or the menu
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# or the grab window has been deleted.
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proc tk_mbUnpost {} {
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global tk_priv
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set w $tk_priv(posted)
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if {$w != ""} {
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catch {
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set menu [lindex [$w config -menu] 4]
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$menu unpost
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$menu config -activebackground $tk_priv(activeBg)
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$menu config -activeforeground $tk_priv(activeFg)
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$w config -relief $tk_priv(relief)
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}
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catch {$tk_priv(grab) config -cursor $tk_priv(cursor)}
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catch {focus $tk_priv(focus)}
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grab release $tk_priv(grab)
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set tk_priv(grab) ""
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set tk_priv(focus) ""
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set tk_priv(posted) {}
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}
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}
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# The procedure below is invoked to implement keyboard traversal to
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# a menu button. It takes two arguments: the name of a window where
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# a keystroke originated, and the ascii character that was typed.
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# This procedure finds a menu bar by looking upward for a top-level
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# window, then looking for a window underneath that named "menu".
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# Then it searches through all the subwindows of "menu" for a menubutton
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# with an underlined character matching char. If one is found, it
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# posts that menu.
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proc tk_traverseToMenu {w char} {
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global tk_priv
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if {$char == ""} {
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return
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}
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set char [string tolower $char]
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foreach mb [tk_getMenuButtons $w] {
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if {[winfo class $mb] == "Menubutton"} {
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set char2 [string index [lindex [$mb config -text] 4] \
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[lindex [$mb config -underline] 4]]
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if {[string compare $char [string tolower $char2]] == 0} {
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tk_mbPost $mb
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[lindex [$mb config -menu] 4] activate 0
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return
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}
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}
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}
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}
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# The procedure below is used to implement keyboard traversal within
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# the posted menu. It takes two arguments: the name of the menu to
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# be traversed within, and an ASCII character. It searches for an
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# entry in the menu that has that character underlined. If such an
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# entry is found, it is invoked and the menu is unposted.
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proc tk_traverseWithinMenu {w char} {
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if {$char == ""} {
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return
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}
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set char [string tolower $char]
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set last [$w index last]
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if {$last == "none"} {
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return
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}
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for {set i 0} {$i <= $last} {incr i} {
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if [catch {set char2 [string index \
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[lindex [$w entryconfig $i -label] 4] \
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[lindex [$w entryconfig $i -underline] 4]]}] {
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continue
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}
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if {[string compare $char [string tolower $char2]] == 0} {
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tk_mbUnpost
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$w invoke $i
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return
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}
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}
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}
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# The procedure below takes a single argument, which is the name of
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# a window. It returns a list containing path names for all of the
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# menu buttons associated with that window's top-level window, or an
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# empty list if there are none.
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proc tk_getMenuButtons w {
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global tk_priv
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set top [winfo toplevel $w]
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if [catch {set bar [set tk_priv(menuBarFor$top)]}] {
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return ""
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}
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return $tk_priv(menusFor$bar)
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}
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# The procedure below is used to traverse to the next or previous
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# menu in a menu bar. It takes one argument, which is a count of
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# how many menu buttons forward or backward (if negative) to move.
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# If there is no posted menu then this procedure has no effect.
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proc tk_nextMenu count {
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global tk_priv
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if {$tk_priv(posted) == ""} {
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return
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}
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set buttons [tk_getMenuButtons $tk_priv(posted)]
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set length [llength $buttons]
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for {set i 0} 1 {incr i} {
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if {$i >= $length} {
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return
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}
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if {[lindex $buttons $i] == $tk_priv(posted)} {
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break
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}
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}
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incr i $count
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while 1 {
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while {$i < 0} {
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incr i $length
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}
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while {$i >= $length} {
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incr i -$length
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}
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set mb [lindex $buttons $i]
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if {[lindex [$mb configure -state] 4] != "disabled"} {
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break
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}
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incr i $count
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}
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tk_mbUnpost
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tk_mbPost $mb
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[lindex [$mb config -menu] 4] activate 0
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}
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# The procedure below is used to traverse to the next or previous entry
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# in the posted menu. It takes one argument, which is 1 to go to the
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# next entry or -1 to go to the previous entry. Disabled entries are
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# skipped in this process.
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proc tk_nextMenuEntry count {
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global tk_priv
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if {$tk_priv(posted) == ""} {
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return
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}
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set menu [lindex [$tk_priv(posted) config -menu] 4]
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if {[$menu index last] == "none"} {
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return
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}
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set length [expr [$menu index last]+1]
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set i [$menu index active]
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if {$i == "none"} {
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set i 0
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} else {
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incr i $count
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}
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while 1 {
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while {$i < 0} {
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incr i $length
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}
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while {$i >= $length} {
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incr i -$length
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}
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if {[catch {$menu entryconfigure $i -state} state] == 0} {
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if {[lindex $state 4] != "disabled"} {
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break
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}
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}
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incr i $count
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}
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$menu activate $i
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}
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# The procedure below invokes the active entry in the posted menu,
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# if there is one. Otherwise it does nothing.
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proc tk_invokeMenu {menu} {
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set i [$menu index active]
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if {$i != "none"} {
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tk_mbUnpost
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update idletasks
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$menu invoke $i
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}
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}
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# The procedure below is invoked to keyboard-traverse to the first
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# menu for a given source window. The source window is passed as
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# parameter.
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proc tk_firstMenu w {
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set mb [lindex [tk_getMenuButtons $w] 0]
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if {$mb != ""} {
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tk_mbPost $mb
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[lindex [$mb config -menu] 4] activate 0
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}
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}
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# The procedure below is invoked when a button-1-down event is
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# received by a menu button. If the mouse is in the menu button
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# then it posts the button's menu. If the mouse isn't in the
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# button's menu, then it deactivates any active entry in the menu.
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# Remember, event-sharing can cause this procedure to be invoked
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# for two different menu buttons on the same event.
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proc tk_mbButtonDown w {
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global tk_priv
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if {[lindex [$w config -state] 4] == "disabled"} {
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return
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}
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if {$tk_priv(inMenuButton) == $w} {
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tk_mbPost $w
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}
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}
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