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# menu.tcl --
#
# This file defines the default bindings for Tk menus and menubuttons.
# It also implements keyboard traversal of menus and implements a few
# other utility procedures related to menus.
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
# Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
#-------------------------------------------------------------------------
# Elements of tk::Priv that are used in this file:
#
# cursor - Saves the -cursor option for the posted menubutton.
# focus - Saves the focus during a menu selection operation.
# Focus gets restored here when the menu is unposted.
# grabGlobal - Used in conjunction with tk::Priv(oldGrab): if
# tk::Priv(oldGrab) is non-empty, then tk::Priv(grabGlobal)
# contains either an empty string or "-global" to
# indicate whether the old grab was a local one or
# a global one.
# inMenubutton - The name of the menubutton widget containing
# the mouse, or an empty string if the mouse is
# not over any menubutton.
# menuBar - The name of the menubar that is the root
# of the cascade hierarchy which is currently
# posted. This is null when there is no menu currently
# being pulled down from a menu bar.
# oldGrab - Window that had the grab before a menu was posted.
# Used to restore the grab state after the menu
# is unposted. Empty string means there was no
# grab previously set.
# popup - If a menu has been popped up via tk_popup, this
# gives the name of the menu. Otherwise this
# value is empty.
# postedMb - Name of the menubutton whose menu is currently
# posted, or an empty string if nothing is posted
# A grab is set on this widget.
# relief - Used to save the original relief of the current
# menubutton.
# window - When the mouse is over a menu, this holds the
# name of the menu; it's cleared when the mouse
# leaves the menu.
# tearoff - Whether the last menu posted was a tearoff or not.
# This is true always for unix, for tearoffs for Mac
# and Windows.
# activeMenu - This is the last active menu for use
# with the <<MenuSelect>> virtual event.
# activeItem - This is the last active menu item for
# use with the <<MenuSelect>> virtual event.
#-------------------------------------------------------------------------
#-------------------------------------------------------------------------
# Overall note:
# This file is tricky because there are five different ways that menus
# can be used:
#
# 1. As a pulldown from a menubutton. In this style, the variable
# tk::Priv(postedMb) identifies the posted menubutton.
# 2. As a torn-off menu copied from some other menu. In this style
# tk::Priv(postedMb) is empty, and menu's type is "tearoff".
# 3. As an option menu, triggered from an option menubutton. In this
# style tk::Priv(postedMb) identifies the posted menubutton.
# 4. As a popup menu. In this style tk::Priv(postedMb) is empty and
# the top-level menu's type is "normal".
# 5. As a pulldown from a menubar. The variable tk::Priv(menubar) has
# the owning menubar, and the menu itself is of type "normal".
#
# The various binding procedures use the state described above to
# distinguish the various cases and take different actions in each
# case.
#-------------------------------------------------------------------------
#-------------------------------------------------------------------------
# The code below creates the default class bindings for menus
# and menubuttons.
#-------------------------------------------------------------------------
bind Menubutton <FocusIn> {}
bind Menubutton <Enter> {
tk::MbEnter %W
}
bind Menubutton <Leave> {
tk::MbLeave %W
}
bind Menubutton <1> {
if {$tk::Priv(inMenubutton) ne ""} {
tk::MbPost $tk::Priv(inMenubutton) %X %Y
}
}
bind Menubutton <Motion> {
tk::MbMotion %W up %X %Y
}
bind Menubutton <B1-Motion> {
tk::MbMotion %W down %X %Y
}
bind Menubutton <ButtonRelease-1> {
tk::MbButtonUp %W
}
bind Menubutton <space> {
tk::MbPost %W
tk::MenuFirstEntry [%W cget -menu]
}
# Must set focus when mouse enters a menu, in order to allow
# mixed-mode processing using both the mouse and the keyboard.
# Don't set the focus if the event comes from a grab release,
# though: such an event can happen after as part of unposting
# a cascaded chain of menus, after the focus has already been
# restored to wherever it was before menu selection started.
bind Menu <FocusIn> {}
bind Menu <Enter> {
set tk::Priv(window) %W
if {[%W cget -type] eq "tearoff"} {
if {"%m" ne "NotifyUngrab"} {
if {[tk windowingsystem] eq "x11"} {
tk_menuSetFocus %W
}
}
}
tk::MenuMotion %W %x %y %s
}
bind Menu <Leave> {
tk::MenuLeave %W %X %Y %s
}
bind Menu <Motion> {
tk::MenuMotion %W %x %y %s
}
bind Menu <ButtonPress> {
tk::MenuButtonDown %W
}
bind Menu <ButtonRelease> {
tk::MenuInvoke %W 1
}
bind Menu <space> {
tk::MenuInvoke %W 0
}
bind Menu <Return> {
tk::MenuInvoke %W 0
}
bind Menu <Escape> {
tk::MenuEscape %W
}
bind Menu <Left> {
tk::MenuLeftArrow %W
}
bind Menu <Right> {
tk::MenuRightArrow %W
}
bind Menu <Up> {
tk::MenuUpArrow %W
}
bind Menu <Down> {
tk::MenuDownArrow %W
}
bind Menu <KeyPress> {
tk::TraverseWithinMenu %W %A
}
# The following bindings apply to all windows, and are used to
# implement keyboard menu traversal.
if {[tk windowingsystem] eq "x11"} {
bind all <Alt-KeyPress> {
tk::TraverseToMenu %W %A
}
bind all <F10> {
tk::FirstMenu %W
}
} else {
bind Menubutton <Alt-KeyPress> {
tk::TraverseToMenu %W %A
}
bind Menubutton <F10> {
tk::FirstMenu %W
}
}
# ::tk::MbEnter --
# This procedure is invoked when the mouse enters a menubutton
# widget. It activates the widget unless it is disabled. Note:
# this procedure is only invoked when mouse button 1 is *not* down.
# The procedure ::tk::MbB1Enter is invoked if the button is down.
#
# Arguments:
# w - The name of the widget.
proc ::tk::MbEnter w {
variable ::tk::Priv
if {$Priv(inMenubutton) ne ""} {
MbLeave $Priv(inMenubutton)
}
set Priv(inMenubutton) $w
if {[$w cget -state] ne "disabled" && [tk windowingsystem] ne "aqua"} {
$w configure -state active
}
}
# ::tk::MbLeave --
# This procedure is invoked when the mouse leaves a menubutton widget.
# It de-activates the widget, if the widget still exists.
#
# Arguments:
# w - The name of the widget.
proc ::tk::MbLeave w {
variable ::tk::Priv
set Priv(inMenubutton) {}
if {![winfo exists $w]} {
return
}
if {[$w cget -state] eq "active" && [tk windowingsystem] ne "aqua"} {
$w configure -state normal
}
}
# ::tk::MbPost --
# Given a menubutton, this procedure does all the work of posting
# its associated menu and unposting any other menu that is currently
# posted.
#
# Arguments:
# w - The name of the menubutton widget whose menu
# is to be posted.
# x, y - Root coordinates of cursor, used for positioning
# option menus. If not specified, then the center
# of the menubutton is used for an option menu.
proc ::tk::MbPost {w {x {}} {y {}}} {
global errorInfo
variable ::tk::Priv
global tcl_platform
if {[$w cget -state] eq "disabled" || $w eq $Priv(postedMb)} {
return
}
set menu [$w cget -menu]
if {$menu eq ""} {
return
}
set tearoff [expr {[tk windowingsystem] eq "x11" \
|| [$menu cget -type] eq "tearoff"}]
if {[string first $w $menu] != 0} {
error "can't post $menu: it isn't a descendant of $w (this is a new requirement in Tk versions 3.0 and later)"
}
set cur $Priv(postedMb)
if {$cur ne ""} {
MenuUnpost {}
}
if {$::tk_strictMotif} {
set Priv(cursor) [$w cget -cursor]
$w configure -cursor arrow
}
if {[tk windowingsystem] ne "aqua"} {
set Priv(relief) [$w cget -relief]
$w configure -relief raised
} else {
$w configure -state active
}
set Priv(postedMb) $w
set Priv(focus) [focus]
$menu activate none
GenerateMenuSelect $menu
# If this looks like an option menubutton then post the menu so
# that the current entry is on top of the mouse. Otherwise post
# the menu just below the menubutton, as for a pull-down.
update idletasks
if {[catch {
switch [$w cget -direction] {
above {
set x [winfo rootx $w]
set y [expr {[winfo rooty $w] - [winfo reqheight $menu]}]
# if we go offscreen to the top, show as 'below'
if {$y < [winfo vrooty $w]} {
set y [expr {[winfo vrooty $w] + [winfo rooty $w] + [winfo reqheight $w]}]
}
PostOverPoint $menu $x $y
}
below {
set x [winfo rootx $w]
set y [expr {[winfo rooty $w] + [winfo height $w]}]
# if we go offscreen to the bottom, show as 'above'
set mh [winfo reqheight $menu]
if {($y + $mh) > ([winfo vrooty $w] + [winfo vrootheight $w])} {
set y [expr {[winfo vrooty $w] + [winfo vrootheight $w] + [winfo rooty $w] - $mh}]
}
PostOverPoint $menu $x $y
}
left {
set x [expr {[winfo rootx $w] - [winfo reqwidth $menu]}]
set y [expr {(2 * [winfo rooty $w] + [winfo height $w]) / 2}]
set entry [MenuFindName $menu [$w cget -text]]
if {[$w cget -indicatoron]} {
if {$entry == [$menu index last]} {
incr y [expr {-([$menu yposition $entry] \
+ [winfo reqheight $menu])/2}]
} else {
incr y [expr {-([$menu yposition $entry] \
+ [$menu yposition [expr {$entry+1}]])/2}]
}
}
PostOverPoint $menu $x $y
if {$entry ne "" \
&& [$menu entrycget $entry -state] ne "disabled"} {
$menu activate $entry
GenerateMenuSelect $menu
}
}
right {
set x [expr {[winfo rootx $w] + [winfo width $w]}]
set y [expr {(2 * [winfo rooty $w] + [winfo height $w]) / 2}]
set entry [MenuFindName $menu [$w cget -text]]
if {[$w cget -indicatoron]} {
if {$entry == [$menu index last]} {
incr y [expr {-([$menu yposition $entry] \
+ [winfo reqheight $menu])/2}]
} else {
incr y [expr {-([$menu yposition $entry] \
+ [$menu yposition [expr {$entry+1}]])/2}]
}
}
PostOverPoint $menu $x $y
if {$entry ne "" \
&& [$menu entrycget $entry -state] ne "disabled"} {
$menu activate $entry
GenerateMenuSelect $menu
}
}
default {
if {[$w cget -indicatoron]} {
if {$y eq ""} {
set x [expr {[winfo rootx $w] + [winfo width $w]/2}]
set y [expr {[winfo rooty $w] + [winfo height $w]/2}]
}
PostOverPoint $menu $x $y [MenuFindName $menu [$w cget -text]]
} else {
PostOverPoint $menu [winfo rootx $w] [expr {[winfo rooty $w]+[winfo height $w]}]
}
}
}
} msg]} {
# Error posting menu (e.g. bogus -postcommand). Unpost it and
# reflect the error.
set savedInfo $errorInfo
MenuUnpost {}
error $msg $savedInfo
}
set Priv(tearoff) $tearoff
if {$tearoff != 0} {
focus $menu
if {[winfo viewable $w]} {
SaveGrabInfo $w
grab -global $w
}
}
}
# ::tk::MenuUnpost --
# This procedure unposts a given menu, plus all of its ancestors up
# to (and including) a menubutton, if any. It also restores various
# values to what they were before the menu was posted, and releases
# a grab if there's a menubutton involved. Special notes:
# 1. It's important to unpost all menus before releasing the grab, so
# that any Enter-Leave events (e.g. from menu back to main
# application) have mode NotifyGrab.
# 2. Be sure to enclose various groups of commands in "catch" so that
# the procedure will complete even if the menubutton or the menu
# or the grab window has been deleted.
#
# Arguments:
# menu - Name of a menu to unpost. Ignored if there
# is a posted menubutton.
proc ::tk::MenuUnpost menu {
global tcl_platform
variable ::tk::Priv
set mb $Priv(postedMb)
# Restore focus right away (otherwise X will take focus away when
# the menu is unmapped and under some window managers (e.g. olvwm)
# we'll lose the focus completely).
catch {focus $Priv(focus)}
set Priv(focus) ""
# Unpost menu(s) and restore some stuff that's dependent on
# what was posted.
after cancel [array get Priv menuActivatedTimer]
unset -nocomplain Priv(menuActivated)
after cancel [array get Priv menuDeactivatedTimer]
unset -nocomplain Priv(menuDeactivated)
catch {
if {$mb ne ""} {
set menu [$mb cget -menu]
$menu unpost
set Priv(postedMb) {}
if {$::tk_strictMotif} {
$mb configure -cursor $Priv(cursor)
}
if {[tk windowingsystem] ne "aqua"} {
$mb configure -relief $Priv(relief)
} else {
$mb configure -state normal
}
} elseif {$Priv(popup) ne ""} {
$Priv(popup) unpost
set Priv(popup) {}
} elseif {[$menu cget -type] ne "menubar" && [$menu cget -type] ne "tearoff"} {
# We're in a cascaded sub-menu from a torn-off menu or popup.
# Unpost all the menus up to the toplevel one (but not
# including the top-level torn-off one) and deactivate the
# top-level torn off menu if there is one.
while {1} {
set parent [winfo parent $menu]
if {[winfo class $parent] ne "Menu" || ![winfo ismapped $parent]} {
break
}
$parent activate none
$parent postcascade none
GenerateMenuSelect $parent
set type [$parent cget -type]
if {$type eq "menubar" || $type eq "tearoff"} {
break
}
set menu $parent
}
if {[$menu cget -type] ne "menubar"} {
$menu unpost
}
}
}
if {($Priv(tearoff) != 0) || $Priv(menuBar) ne ""} {
# Release grab, if any, and restore the previous grab, if there
# was one.
if {$menu ne ""} {
set grab [grab current $menu]
if {$grab ne ""} {
grab release $grab
}
}
RestoreOldGrab
if {$Priv(menuBar) ne ""} {
if {$::tk_strictMotif} {
$Priv(menuBar) configure -cursor $Priv(cursor)
}
set Priv(menuBar) {}
}
if {[tk windowingsystem] ne "x11"} {
set Priv(tearoff) 0
}
}
}
# ::tk::MbMotion --
# This procedure handles mouse motion events inside menubuttons, and
# also outside menubuttons when a menubutton has a grab (e.g. when a
# menu selection operation is in progress).
#
# Arguments:
# w - The name of the menubutton widget.
# upDown - "down" means button 1 is pressed, "up" means
# it isn't.
# rootx, rooty - Coordinates of mouse, in (virtual?) root window.
proc ::tk::MbMotion {w upDown rootx rooty} {
variable ::tk::Priv
if {$Priv(inMenubutton) eq $w} {
return
}
set new [winfo containing $rootx $rooty]
if {$new ne $Priv(inMenubutton) \
&& ($new eq "" || [winfo toplevel $new] eq [winfo toplevel $w])} {
if {$Priv(inMenubutton) ne ""} {
MbLeave $Priv(inMenubutton)
}
if {$new ne "" \
&& [winfo class $new] eq "Menubutton" \
&& ([$new cget -indicatoron] == 0) \
&& ([$w cget -indicatoron] == 0)} {
if {$upDown eq "down"} {
MbPost $new $rootx $rooty
} else {
MbEnter $new
}
}
}
}
# ::tk::MbButtonUp --
# This procedure is invoked to handle button 1 releases for menubuttons.
# If the release happens inside the menubutton then leave its menu
# posted with element 0 activated. Otherwise, unpost the menu.
#
# Arguments:
# w - The name of the menubutton widget.
proc ::tk::MbButtonUp w {
variable ::tk::Priv
global tcl_platform
set menu [$w cget -menu]
set tearoff [expr {[tk windowingsystem] eq "x11" || \
($menu ne "" && [$menu cget -type] eq "tearoff")}]
if {($tearoff != 0) && $Priv(postedMb) eq $w \
&& $Priv(inMenubutton) eq $w} {
MenuFirstEntry [$Priv(postedMb) cget -menu]
} else {
MenuUnpost {}
}
}
# ::tk::MenuMotion --
# This procedure is called to handle mouse motion events for menus.
# It does two things. First, it resets the active element in the
# menu, if the mouse is over the menu. Second, if a mouse button
# is down, it posts and unposts cascade entries to match the mouse
# position.
#
# Arguments:
# menu - The menu window.
# x - The x position of the mouse.
# y - The y position of the mouse.
# state - Modifier state (tells whether buttons are down).
proc ::tk::MenuMotion {menu x y state} {
variable ::tk::Priv
if {$menu eq $Priv(window)} {
set activeindex [$menu index active]
if {[$menu cget -type] eq "menubar"} {
if {[info exists Priv(focus)] && $menu ne $Priv(focus)} {
$menu activate @$x,$y
GenerateMenuSelect $menu
}
} else {
$menu activate @$x,$y
GenerateMenuSelect $menu
}
set index [$menu index @$x,$y]
if {[info exists Priv(menuActivated)] \
&& $index ne "none" \
&& $index ne $activeindex} {
set mode [option get $menu clickToFocus ClickToFocus]
if {[string is false $mode]} {
set delay [expr {[$menu cget -type] eq "menubar" ? 0 : 50}]
if {[$menu type $index] eq "cascade"} {
set Priv(menuActivatedTimer) \
[after $delay [list $menu postcascade active]]
} else {
set Priv(menuDeactivatedTimer) \
[after $delay [list $menu postcascade none]]
}
}
}
}
}
# ::tk::MenuButtonDown --
# Handles button presses in menus. There are a couple of tricky things
# here:
# 1. Change the posted cascade entry (if any) to match the mouse position.
# 2. If there is a posted menubutton, must grab to the menubutton; this
# overrrides the implicit grab on button press, so that the menu
# button can track mouse motions over other menubuttons and change
# the posted menu.
# 3. If there's no posted menubutton (e.g. because we're a torn-off menu
# or one of its descendants) must grab to the top-level menu so that
# we can track mouse motions across the entire menu hierarchy.
#
# Arguments:
# menu - The menu window.
proc ::tk::MenuButtonDown menu {
variable ::tk::Priv
global tcl_platform
if {![winfo viewable $menu]} {
return
}
$menu postcascade active
if {$Priv(postedMb) ne "" && [winfo viewable $Priv(postedMb)]} {
grab -global $Priv(postedMb)
} else {
while {[$menu cget -type] eq "normal" \
&& [winfo class [winfo parent $menu]] eq "Menu" \
&& [winfo ismapped [winfo parent $menu]]} {
set menu [winfo parent $menu]
}
if {$Priv(menuBar) eq {}} {
set Priv(menuBar) $menu
if {$::tk_strictMotif} {
set Priv(cursor) [$menu cget -cursor]
$menu configure -cursor arrow
}
if {[$menu type active] eq "cascade"} {
set Priv(menuActivated) 1
}
}
# Don't update grab information if the grab window isn't changing.
# Otherwise, we'll get an error when we unpost the menus and
# restore the grab, since the old grab window will not be viewable
# anymore.
if {$menu ne [grab current $menu]} {
SaveGrabInfo $menu
}
# Must re-grab even if the grab window hasn't changed, in order
# to release the implicit grab from the button press.
if {[tk windowingsystem] eq "x11"} {
grab -global $menu
}
}
}
# ::tk::MenuLeave --
# This procedure is invoked to handle Leave events for a menu. It
# deactivates everything unless the active element is a cascade element
# and the mouse is now over the submenu.
#
# Arguments:
# menu - The menu window.
# rootx, rooty - Root coordinates of mouse.
# state - Modifier state.
proc ::tk::MenuLeave {menu rootx rooty state} {
variable ::tk::Priv
set Priv(window) {}
if {[$menu index active] eq "none"} {
return
}
if {[$menu type active] eq "cascade" \
&& [winfo containing $rootx $rooty] eq \
[$menu entrycget active -menu]} {
return
}
$menu activate none
GenerateMenuSelect $menu
}
# ::tk::MenuInvoke --
# This procedure is invoked when button 1 is released over a menu.
# It invokes the appropriate menu action and unposts the menu if
# it came from a menubutton.
#
# Arguments:
# w - Name of the menu widget.
# buttonRelease - 1 means this procedure is called because of
# a button release; 0 means because of keystroke.
proc ::tk::MenuInvoke {w buttonRelease} {
variable ::tk::Priv
if {$buttonRelease && $Priv(window) eq ""} {
# Mouse was pressed over a menu without a menu button, then
# dragged off the menu (possibly with a cascade posted) and
# released. Unpost everything and quit.
$w postcascade none
$w activate none
event generate $w <<MenuSelect>>
MenuUnpost $w
return
}
if {[$w type active] eq "cascade"} {
$w postcascade active
set menu [$w entrycget active -menu]
MenuFirstEntry $menu
} elseif {[$w type active] eq "tearoff"} {
::tk::TearOffMenu $w
MenuUnpost $w
} elseif {[$w cget -type] eq "menubar"} {
$w postcascade none
set active [$w index active]
set isCascade [string equal [$w type $active] "cascade"]
# Only de-activate the active item if it's a cascade; this prevents
# the annoying "activation flicker" you otherwise get with
# checkbuttons/commands/etc. on menubars
if { $isCascade } {
$w activate none
event generate $w <<MenuSelect>>
}
MenuUnpost $w
# If the active item is not a cascade, invoke it. This enables
# the use of checkbuttons/commands/etc. on menubars (which is legal,
# but not recommended)
if { !$isCascade } {
uplevel #0 [list $w invoke $active]
}
} else {
set active [$w index active]
if {$Priv(popup) eq "" || $active ne "none"} {
MenuUnpost $w
}
uplevel #0 [list $w invoke active]
}
}
# ::tk::MenuEscape --
# This procedure is invoked for the Cancel (or Escape) key. It unposts
# the given menu and, if it is the top-level menu for a menu button,
# unposts the menu button as well.
#
# Arguments:
# menu - Name of the menu window.
proc ::tk::MenuEscape menu {
set parent [winfo parent $menu]
if {[winfo class $parent] ne "Menu"} {
MenuUnpost $menu
} elseif {[$parent cget -type] eq "menubar"} {
MenuUnpost $menu
RestoreOldGrab
} else {
MenuNextMenu $menu left
}
}
# The following routines handle arrow keys. Arrow keys behave
# differently depending on whether the menu is a menu bar or not.
proc ::tk::MenuUpArrow {menu} {
if {[$menu cget -type] eq "menubar"} {
MenuNextMenu $menu left
} else {
MenuNextEntry $menu -1
}
}
proc ::tk::MenuDownArrow {menu} {
if {[$menu cget -type] eq "menubar"} {
MenuNextMenu $menu right
} else {
MenuNextEntry $menu 1
}
}
proc ::tk::MenuLeftArrow {menu} {
if {[$menu cget -type] eq "menubar"} {
MenuNextEntry $menu -1
} else {
MenuNextMenu $menu left
}
}
proc ::tk::MenuRightArrow {menu} {
if {[$menu cget -type] eq "menubar"} {
MenuNextEntry $menu 1
} else {
MenuNextMenu $menu right
}
}
# ::tk::MenuNextMenu --
# This procedure is invoked to handle "left" and "right" traversal
# motions in menus. It traverses to the next menu in a menu bar,
# or into or out of a cascaded menu.
#
# Arguments:
# menu - The menu that received the keyboard
# event.
# direction - Direction in which to move: "left" or "right"
proc ::tk::MenuNextMenu {menu direction} {
variable ::tk::Priv
# First handle traversals into and out of cascaded menus.
if {$direction eq "right"} {
set count 1
set parent [winfo parent $menu]
set class [winfo class $parent]
if {[$menu type active] eq "cascade"} {
$menu postcascade active
set m2 [$menu entrycget active -menu]
if {$m2 ne ""} {
MenuFirstEntry $m2
}
return
} else {
set parent [winfo parent $menu]
while {$parent ne "."} {
if {[winfo class $parent] eq "Menu" \
&& [$parent cget -type] eq "menubar"} {
tk_menuSetFocus $parent
MenuNextEntry $parent 1
return
}
set parent [winfo parent $parent]
}
}
} else {
set count -1
set m2 [winfo parent $menu]
if {[winfo class $m2] eq "Menu"} {
$menu activate none
GenerateMenuSelect $menu
tk_menuSetFocus $m2
$m2 postcascade none
if {[$m2 cget -type] ne "menubar"} {
return
}
}
}
# Can't traverse into or out of a cascaded menu. Go to the next
# or previous menubutton, if that makes sense.
set m2 [winfo parent $menu]
if {[winfo class $m2] eq "Menu" && [$m2 cget -type] eq "menubar"} {
tk_menuSetFocus $m2
MenuNextEntry $m2 -1
return
}
set w $Priv(postedMb)
if {$w eq ""} {
return
}
set buttons [winfo children [winfo parent $w]]
set length [llength $buttons]
set i [expr {[lsearch -exact $buttons $w] + $count}]
while {1} {
while {$i < 0} {
incr i $length
}
while {$i >= $length} {
incr i -$length
}
set mb [lindex $buttons $i]
if {[winfo class $mb] eq "Menubutton" \
&& [$mb cget -state] ne "disabled" \
&& [$mb cget -menu] ne "" \
&& [[$mb cget -menu] index last] ne "none"} {
break
}
if {$mb eq $w} {
return
}
incr i $count
}
MbPost $mb
MenuFirstEntry [$mb cget -menu]
}
# ::tk::MenuNextEntry --
# Activate the next higher or lower entry in the posted menu,
# wrapping around at the ends. Disabled entries are skipped.
#
# Arguments:
# menu - Menu window that received the keystroke.
# count - 1 means go to the next lower entry,
# -1 means go to the next higher entry.
proc ::tk::MenuNextEntry {menu count} {
if {[$menu index last] eq "none"} {
return
}
set length [expr {[$menu index last]+1}]
set quitAfter $length
set active [$menu index active]
if {$active eq "none"} {
set i 0
} else {
set i [expr {$active + $count}]
}
while {1} {
if {$quitAfter <= 0} {
# We've tried every entry in the menu. Either there are
# none, or they're all disabled. Just give up.
return
}
while {$i < 0} {
incr i $length
}
while {$i >= $length} {
incr i -$length
}
if {[catch {$menu entrycget $i -state} state] == 0} {
if {$state ne "disabled" && \
($i!=0 || [$menu cget -type] ne "tearoff" \
|| [$menu type 0] ne "tearoff")} {
break
}
}
if {$i == $active} {
return
}
incr i $count
incr quitAfter -1
}
$menu activate $i
GenerateMenuSelect $menu
if {[$menu type $i] eq "cascade" && [$menu cget -type] eq "menubar"} {
set cascade [$menu entrycget $i -menu]
if {$cascade ne ""} {
# Here we auto-post a cascade. This is necessary when
# we traverse left/right in the menubar, but undesirable when
# we traverse up/down in a menu.
$menu postcascade $i
MenuFirstEntry $cascade
}
}
}
# ::tk::MenuFind --
# This procedure searches the entire window hierarchy under w for
# a menubutton that isn't disabled and whose underlined character
# is "char" or an entry in a menubar that isn't disabled and whose
# underlined character is "char".
# It returns the name of that window, if found, or an
# empty string if no matching window was found. If "char" is an
# empty string then the procedure returns the name of the first
# menubutton found that isn't disabled.
#
# Arguments:
# w - Name of window where key was typed.
# char - Underlined character to search for;
# may be either upper or lower case, and
# will match either upper or lower case.
proc ::tk::MenuFind {w char} {
set char [string tolower $char]
set windowlist [winfo child $w]
foreach child $windowlist {
# Don't descend into other toplevels.
if {[winfo toplevel $w] ne [winfo toplevel $child]} {
continue
}
if {[winfo class $child] eq "Menu" && \
[$child cget -type] eq "menubar"} {
if {$char eq ""} {
return $child
}
set last [$child index last]
for {set i [$child cget -tearoff]} {$i <= $last} {incr i} {
if {[$child type $i] eq "separator"} {
continue
}
set char2 [string index [$child entrycget $i -label] \
[$child entrycget $i -underline]]
if {$char eq [string tolower $char2] || $char eq ""} {
if {[$child entrycget $i -state] ne "disabled"} {
return $child
}
}
}
}
}
foreach child $windowlist {
# Don't descend into other toplevels.
if {[winfo toplevel $w] ne [winfo toplevel $child]} {
continue
}
switch -- [winfo class $child] {
Menubutton {
set char2 [string index [$child cget -text] \
[$child cget -underline]]
if {$char eq [string tolower $char2] || $char eq ""} {
if {[$child cget -state] ne "disabled"} {
return $child
}
}
}
default {
set match [MenuFind $child $char]
if {$match ne ""} {
return $match
}
}
}
}
return {}
}
# ::tk::TraverseToMenu --
# This procedure implements keyboard traversal of menus. Given an
# ASCII character "char", it looks for a menubutton with that character
# underlined. If one is found, it posts the menubutton's menu
#
# Arguments:
# w - Window in which the key was typed (selects
# a toplevel window).
# char - Character that selects a menu. The case
# is ignored. If an empty string, nothing
# happens.
proc ::tk::TraverseToMenu {w char} {
variable ::tk::Priv
if {$char eq ""} {
return
}
while {[winfo class $w] eq "Menu"} {
if {[$w cget -type] eq "menubar"} {
break
} elseif {$Priv(postedMb) eq ""} {
return
}
set w [winfo parent $w]
}
set w [MenuFind [winfo toplevel $w] $char]
if {$w ne ""} {
if {[winfo class $w] eq "Menu"} {
tk_menuSetFocus $w
set Priv(window) $w
SaveGrabInfo $w
grab -global $w
TraverseWithinMenu $w $char
} else {
MbPost $w
MenuFirstEntry [$w cget -menu]
}
}
}
# ::tk::FirstMenu --
# This procedure traverses to the first menubutton in the toplevel
# for a given window, and posts that menubutton's menu.
#
# Arguments:
# w - Name of a window. Selects which toplevel
# to search for menubuttons.
proc ::tk::FirstMenu w {
variable ::tk::Priv
set w [MenuFind [winfo toplevel $w] ""]
if {$w ne ""} {
if {[winfo class $w] eq "Menu"} {
tk_menuSetFocus $w
set Priv(window) $w
SaveGrabInfo $w
grab -global $w
MenuFirstEntry $w
} else {
MbPost $w
MenuFirstEntry [$w cget -menu]
}
}
}
# ::tk::TraverseWithinMenu
# This procedure implements keyboard traversal within a menu. It
# searches for an entry in the menu that has "char" underlined. If
# such an entry is found, it is invoked and the menu is unposted.
#
# Arguments:
# w - The name of the menu widget.
# char - The character to look for; case is
# ignored. If the string is empty then
# nothing happens.
proc ::tk::TraverseWithinMenu {w char} {
if {$char eq ""} {
return
}
set char [string tolower $char]
set last [$w index last]
if {$last eq "none"} {
return
}
for {set i 0} {$i <= $last} {incr i} {
if {[catch {set char2 [string index \
[$w entrycget $i -label] [$w entrycget $i -underline]]}]} {
continue
}
if {$char eq [string tolower $char2]} {
if {[$w type $i] eq "cascade"} {
$w activate $i
$w postcascade active
event generate $w <<MenuSelect>>
set m2 [$w entrycget $i -menu]
if {$m2 ne ""} {
MenuFirstEntry $m2
}
} else {
MenuUnpost $w
uplevel #0 [list $w invoke $i]
}
return
}
}
}
# ::tk::MenuFirstEntry --
# Given a menu, this procedure finds the first entry that isn't
# disabled or a tear-off or separator, and activates that entry.
# However, if there is already an active entry in the menu (e.g.,
# because of a previous call to tk::PostOverPoint) then the active
# entry isn't changed. This procedure also sets the input focus
# to the menu.
#
# Arguments:
# menu - Name of the menu window (possibly empty).
proc ::tk::MenuFirstEntry menu {
if {$menu eq ""} {
return
}
tk_menuSetFocus $menu
if {[$menu index active] ne "none"} {
return
}
set last [$menu index last]
if {$last eq "none"} {
return
}
for {set i 0} {$i <= $last} {incr i} {
if {([catch {set state [$menu entrycget $i -state]}] == 0) \
&& $state ne "disabled" && [$menu type $i] ne "tearoff"} {
$menu activate $i
GenerateMenuSelect $menu
# Only post the cascade if the current menu is a menubar;
# otherwise, if the first entry of the cascade is a cascade,
# we can get an annoying cascading effect resulting in a bunch of
# menus getting posted (bug 676)
if {[$menu type $i] eq "cascade" && [$menu cget -type] eq "menubar"} {
set cascade [$menu entrycget $i -menu]
if {$cascade ne ""} {
$menu postcascade $i
MenuFirstEntry $cascade
}
}
return
}
}
}
# ::tk::MenuFindName --
# Given a menu and a text string, return the index of the menu entry
# that displays the string as its label. If there is no such entry,
# return an empty string. This procedure is tricky because some names
# like "active" have a special meaning in menu commands, so we can't
# always use the "index" widget command.
#
# Arguments:
# menu - Name of the menu widget.
# s - String to look for.
proc ::tk::MenuFindName {menu s} {
set i ""
if {![regexp {^active$|^last$|^none$|^[0-9]|^@} $s]} {
catch {set i [$menu index $s]}
return $i
}
set last [$menu index last]
if {$last eq "none"} {
return
}
for {set i 0} {$i <= $last} {incr i} {
if {![catch {$menu entrycget $i -label} label]} {
if {$label eq $s} {
return $i
}
}
}
return ""
}
# ::tk::PostOverPoint --
# This procedure posts a given menu such that a given entry in the
# menu is centered over a given point in the root window. It also
# activates the given entry.
#
# Arguments:
# menu - Menu to post.
# x, y - Root coordinates of point.
# entry - Index of entry within menu to center over (x,y).
# If omitted or specified as {}, then the menu's
# upper-left corner goes at (x,y).
proc ::tk::PostOverPoint {menu x y {entry {}}} {
global tcl_platform
if {$entry ne ""} {
if {$entry == [$menu index last]} {
incr y [expr {-([$menu yposition $entry] \
+ [winfo reqheight $menu])/2}]
} else {
incr y [expr {-([$menu yposition $entry] \
+ [$menu yposition [expr {$entry+1}]])/2}]
}
incr x [expr {-[winfo reqwidth $menu]/2}]
}
if {[tk windowingsystem] eq "win32"} {
# osVersion is not available in safe interps
set ver 5
if {[info exists tcl_platform(osVersion)]} {
scan $tcl_platform(osVersion) %d ver
}
# We need to fix some problems with menu posting on Windows,
# where, if the menu would overlap top or bottom of screen,
# Windows puts it in the wrong place for us. We must also
# subtract an extra amount for half the height of the current
# entry. To be safe we subtract an extra 10.
# NOTE: this issue appears to have been resolved in the Window
# manager provided with Vista and Windows 7.
if {$ver < 6} {
set yoffset [expr {[winfo screenheight $menu] \
- $y - [winfo reqheight $menu] - 10}]
if {$yoffset < [winfo vrooty $menu]} {
# The bottom of the menu is offscreen, so adjust upwards
incr y [expr {$yoffset - [winfo vrooty $menu]}]
}
# If we're off the top of the screen (either because we were
# originally or because we just adjusted too far upwards),
# then make the menu popup on the top edge.
if {$y < [winfo vrooty $menu]} {
set y [winfo vrooty $menu]
}
}
}
$menu post $x $y
if {$entry ne "" && [$menu entrycget $entry -state] ne "disabled"} {
$menu activate $entry
GenerateMenuSelect $menu
}
}
# ::tk::SaveGrabInfo --
# Sets the variables tk::Priv(oldGrab) and tk::Priv(grabStatus) to record
# the state of any existing grab on the w's display.
#
# Arguments:
# w - Name of a window; used to select the display
# whose grab information is to be recorded.
proc tk::SaveGrabInfo w {
variable ::tk::Priv
set Priv(oldGrab) [grab current $w]
if {$Priv(oldGrab) ne ""} {
set Priv(grabStatus) [grab status $Priv(oldGrab)]
}
}
# ::tk::RestoreOldGrab --
# Restores the grab to what it was before TkSaveGrabInfo was called.
#
proc ::tk::RestoreOldGrab {} {
variable ::tk::Priv
if {$Priv(oldGrab) ne ""} {
# Be careful restoring the old grab, since it's window may not
# be visible anymore.
catch {
if {$Priv(grabStatus) eq "global"} {
grab set -global $Priv(oldGrab)
} else {
grab set $Priv(oldGrab)
}
}
set Priv(oldGrab) ""
}
}
proc ::tk_menuSetFocus {menu} {
variable ::tk::Priv
if {![info exists Priv(focus)] || $Priv(focus) eq ""} {
set Priv(focus) [focus]
}
focus $menu
}
proc ::tk::GenerateMenuSelect {menu} {
variable ::tk::Priv
if {$Priv(activeMenu) eq $menu \
&& $Priv(activeItem) eq [$menu index active]} {
return
}
set Priv(activeMenu) $menu
set Priv(activeItem) [$menu index active]
event generate $menu <<MenuSelect>>
}
# ::tk_popup --
# This procedure pops up a menu and sets things up for traversing
# the menu and its submenus.
#
# Arguments:
# menu - Name of the menu to be popped up.
# x, y - Root coordinates at which to pop up the
# menu.
# entry - Index of a menu entry to center over (x,y).
# If omitted or specified as {}, then menu's
# upper-left corner goes at (x,y).
proc ::tk_popup {menu x y {entry {}}} {
variable ::tk::Priv
global tcl_platform
if {$Priv(popup) ne "" || $Priv(postedMb) ne ""} {
tk::MenuUnpost {}
}
tk::PostOverPoint $menu $x $y $entry
if {[tk windowingsystem] eq "x11" && [winfo viewable $menu]} {
tk::SaveGrabInfo $menu
grab -global $menu
set Priv(popup) $menu
set Priv(menuActivated) 1
tk_menuSetFocus $menu
}
}