/usr/share/tcltk/tk8.5/focus.tcl is in libtk8.5 8.5.19-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | # focus.tcl --
#
# This file defines several procedures for managing the input
# focus.
#
# Copyright (c) 1994-1995 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_focusNext --
# This procedure returns the name of the next window after "w" in
# "focus order" (the window that should receive the focus next if
# Tab is typed in w). "Next" is defined by a pre-order search
# of a top-level and its non-top-level descendants, with the stacking
# order determining the order of siblings. The "-takefocus" options
# on windows determine whether or not they should be skipped.
#
# Arguments:
# w - Name of a window.
proc ::tk_focusNext w {
set cur $w
while {1} {
# Descend to just before the first child of the current widget.
set parent $cur
set children [winfo children $cur]
set i -1
# Look for the next sibling that isn't a top-level.
while {1} {
incr i
if {$i < [llength $children]} {
set cur [lindex $children $i]
if {[winfo toplevel $cur] eq $cur} {
continue
} else {
break
}
}
# No more siblings, so go to the current widget's parent.
# If it's a top-level, break out of the loop, otherwise
# look for its next sibling.
set cur $parent
if {[winfo toplevel $cur] eq $cur} {
break
}
set parent [winfo parent $parent]
set children [winfo children $parent]
set i [lsearch -exact $children $cur]
}
if {$w eq $cur || [tk::FocusOK $cur]} {
return $cur
}
}
}
# ::tk_focusPrev --
# This procedure returns the name of the previous window before "w" in
# "focus order" (the window that should receive the focus next if
# Shift-Tab is typed in w). "Next" is defined by a pre-order search
# of a top-level and its non-top-level descendants, with the stacking
# order determining the order of siblings. The "-takefocus" options
# on windows determine whether or not they should be skipped.
#
# Arguments:
# w - Name of a window.
proc ::tk_focusPrev w {
set cur $w
while {1} {
# Collect information about the current window's position
# among its siblings. Also, if the window is a top-level,
# then reposition to just after the last child of the window.
if {[winfo toplevel $cur] eq $cur} {
set parent $cur
set children [winfo children $cur]
set i [llength $children]
} else {
set parent [winfo parent $cur]
set children [winfo children $parent]
set i [lsearch -exact $children $cur]
}
# Go to the previous sibling, then descend to its last descendant
# (highest in stacking order. While doing this, ignore top-levels
# and their descendants. When we run out of descendants, go up
# one level to the parent.
while {$i > 0} {
incr i -1
set cur [lindex $children $i]
if {[winfo toplevel $cur] eq $cur} {
continue
}
set parent $cur
set children [winfo children $parent]
set i [llength $children]
}
set cur $parent
if {$w eq $cur || [tk::FocusOK $cur]} {
return $cur
}
}
}
# ::tk::FocusOK --
#
# This procedure is invoked to decide whether or not to focus on
# a given window. It returns 1 if it's OK to focus on the window,
# 0 if it's not OK. The code first checks whether the window is
# viewable. If not, then it never focuses on the window. Then it
# checks the -takefocus option for the window and uses it if it's
# set. If there's no -takefocus option, the procedure checks to
# see if (a) the widget isn't disabled, and (b) it has some key
# bindings. If all of these are true, then 1 is returned.
#
# Arguments:
# w - Name of a window.
proc ::tk::FocusOK w {
set code [catch {$w cget -takefocus} value]
if {($code == 0) && ($value ne "")} {
if {$value == 0} {
return 0
} elseif {$value == 1} {
return [winfo viewable $w]
} else {
set value [uplevel #0 $value [list $w]]
if {$value ne ""} {
return $value
}
}
}
if {![winfo viewable $w]} {
return 0
}
set code [catch {$w cget -state} value]
if {($code == 0) && $value eq "disabled"} {
return 0
}
regexp Key|Focus "[bind $w] [bind [winfo class $w]]"
}
# ::tk_focusFollowsMouse --
#
# If this procedure is invoked, Tk will enter "focus-follows-mouse"
# mode, where the focus is always on whatever window contains the
# mouse. If this procedure isn't invoked, then the user typically
# has to click on a window to give it the focus.
#
# Arguments:
# None.
proc ::tk_focusFollowsMouse {} {
set old [bind all <Enter>]
set script {
if {"%d" eq "NotifyAncestor" || "%d" eq "NotifyNonlinear" \
|| "%d" eq "NotifyInferior"} {
if {[tk::FocusOK %W]} {
focus %W
}
}
}
if {$old ne ""} {
bind all <Enter> "$old; $script"
} else {
bind all <Enter> $script
}
}
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