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# Nf Screen designer for Tk toolkit
# Copyright (C) 2004 Jeff Epler <jepler@unpythonic.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Each label, button, checkbutton, radiobutton, and menubutton can have
# an underlined accelerator key.
#
# To activate an accelerator key K, Alt+K is pressed.
#
# If only one item has this accelerator, then the associated widget
# is invoked. If the associated "widget" is a group of radio buttons,
# the next option is selected. For buttons, the associated widget is
# the button itself. For labels, the associated widget is intended
# to be the same as the widget selected by "label_button" (though the
# definition of label_hotkey is different)
#
# If more than one item has this accelerator, then focus is merely moved
# to the item.
proc make_accel { label underline } {
if {$underline == -1} {
regsub -all {([\\_])} $label {\\\1} label
return $label
}
set a [string range $label 0 [expr $underline-1]]
set b [string range $label $underline end]
regsub -all {([\\_])} $a {\\\1} a
regsub -all {([\\_])} $b {\\\1} b
return "${a}_${b}"
}
proc decode_accel { label } {
set index -1
if {[regexp {^([^\\_]|\\.)*_} $label match]} {
set index [expr [string length $match]-1]
set a [string range $label 0 [expr $index-1]]
set b [string range $label [expr $index+1] end]
regsub -all {\\(.)} $a {\1} a
regsub -all {\\(.)} $b {\1} b
set index [string length $a]
set label ${a}$b
return [list $index $label]
}
regsub -all {\\(.)} $label {\1} label
return [list -1 $label]
}
proc clear_accel_map {} {
global _accel _last_accel
catch { unset _accel }
set _last_accel {}
}
proc label_hotkey {w {activate 1}} {
set x [tk_focusNext $w]
set y [tk_focusNext $x]
set px [winfo parent $x]
set py [winfo parent $y]
if {$px == $py} {
# Next two choices are siblings
# must be a radiobutton
set idx -1
set spx [pack slaves $px]
foreach k $spx {
set v [$k cget -variable]
upvar \#0 $v val
if {[$k cget -value] == $val} {
set idx [lsearch $spx $k]
}
}
if {$activate} {
set idx [expr ($idx+1) % [llength $spx]]
} elseif {$idx == -1} {
set idx 0
}
set w [lindex $spx $idx]
} else {
set w $x
}
if {$activate} {
switch [winfo class $w] {
Button -
Checkbutton -
Radiobutton -
Menubutton {
$w invoke
}
Entry {
$w select 0 end
}
Combobox {
$w open
}
default {}
}
}
tkTabToWindow $w
}
proc see_accel {w k} {
global _accel _last_accel _last_widget
set w [winfo toplevel $w]
if {![info exists _accel($k,$w)]} { return 0 }
set accel $_accel($k,$w)
if {$k == $_last_accel} {
set idx [expr ([lsearch $accel $_last_widget]+1) % [llength $accel]]
} else {
set idx 0
}
set w [lindex $accel $idx]
set _last_accel $k
set _last_widget $w
set k [winfo class $w]
switch $k {
Button -
Menubutton -
Checkbutton -
Radiobutton {
if {[llength $accel] == 1} {
$w invoke
} else {
focus $w
}
}
Label {
label_hotkey $w [expr [llength $accel] == 1]
}
}
return 1
}
bind all <Alt-Key> [concat {if {[see_accel %W %A]} break;} [bind all <Alt-Key>]]
proc setup_menu_accel { path item label } {
set li [decode_accel $label]
set index [lindex $li 0]
set label [lindex $li 1]
$path entryconfigure $item -underline $index -label $label
}
proc setup_widget_accel { path label } {
set li [decode_accel $label]
set index [lindex $li 0]
set label [lindex $li 1]
$path configure -underline $index -text $label
if {$index != -1} {
global _accel
set char [string tolower [string index $label $index]]
set w [winfo toplevel $path]
lappend _accel($char,$w) $path
}
}
proc extract_text { label } {
set li [decode_accel $label]
lindex $li 1
}
proc sbind { tag seq body } {
catch { bind $tag $seq $body }
}
sbind all <Key-ISO_Left_Tab> { tkTabToWindow [tk_focusPrev %W] }
if {[info procs ::tk::TabToWindow] != {}} {
proc tkTabToWindow w [info body ::tk::TabToWindow]
}
clear_accel_map
# vim:sw=4:sts=4:
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