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#
# ZincText - Zinc extension for text input on text items and fields
#
# $Id$
#
# AUTHOR
#
# Patrick Lecoanet <lecoanet@cena.fr>
# (and documentation by Christophe Mertz <mertz@cena.fr>)
#
# Copyright (c) 2002 - 2003 CENA, Patrick Lecoanet
#
# This code is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This code 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this code; if not, write to the Free
# Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
#
# SYNOPSIS
#
# package require zincText;
#
# zn_TextBindings $zinc
#
# $zinc addtag text withtag $a_text
# $zinc addtag text withtag $a_track
# $zinc addtag text withtag $a_waypoint
# $zinc addtag text withtag $a_tabular
#
#
# DESCRIPTION
#
# This module implements text input with the mouse and keyboard 'a la emacs'.
# Text items must have the 'text' tag and must of course be sensitive.
# Track, waypoint and tabular items have fields and these fields can
# be edited the same way. Only sensitive fields can be edited. the following
# interactions are supported:
#
# <click 1> To set the cursor position
# <click 2> To paste the current selection
# <drag 1> To make a selection
# <shift drag 1> To extend the current selection
# <shift 1> To extend the current selection
# <left arrow>,
# <right arrow> To move the cursor to the left or to the right
# <up arrow>,
# <down arrow> To move the cursor up or down a line
# <ctrl+a>,
# <home> To move the cursor at the begining of the line
# <ctrl+e>
# <end> To move the cursor at the end of the line
# <meta+<>,
# <meta+>> To move the cursor at the beginning / end of the text
# <BackSpace>
# <ctrl+h> To delete the char just before the cursor
# <Delete> To delete the char just after the cursor
# <Return> To insert a return char. This does not validate the input!
#
#
proc zn_TextBindings {zinc} {
$zinc bind text <1> "startSel $zinc %x %y"
$zinc bind text <2> "pasteSel $zinc %x %y"
$zinc bind text <B1-Motion> "extendSel $zinc %x %y"
$zinc bind text <Shift-B1-Motion> "extendSel $zinc %x %y"
$zinc bind text <Shift-1> "$zinc select adjust current @%x,%y"
$zinc bind text <Left> "moveCur $zinc -1"
$zinc bind text <Right> "moveCur $zinc 1"
$zinc bind text <Up> "setCur $zinc up"
$zinc bind text <Down> "setCur $zinc down"
$zinc bind text <Control-a> "setCur $zinc bol"
$zinc bind text <Home> "setCur $zinc bol"
$zinc bind text <Control-e> "setCur $zinc eol"
$zinc bind text <End> "setCur $zinc eol"
$zinc bind text <Meta-less> "setCur $zinc 0"
$zinc bind text <Meta-greater> "setCur $zinc end"
$zinc bind text <KeyPress> "insertKey $zinc %A"
$zinc bind text <Shift-KeyPress> "insertKey $zinc %A"
$zinc bind text <Return> "insertChar $zinc \n"
$zinc bind text <BackSpace> "textDel $zinc -1"
$zinc bind text <Control-h> "textDel $zinc -1"
$zinc bind text <Delete> "textDel $zinc 0"
}
proc pasteSel {w x y} {
set item [$w focus]
if {[llength $item] != 0} {
catch {$w insert [lindex $item 0] [lindex $item 1] @$x,$y [selection get]}
}
}
proc insertChar {w c} {
set item [$w focus]
set selItem [$w select item]
if {[llength $item] == 0} {
return;
}
if {([llength $selItem]!= 0) &&
([lindex $selItem 0] == [lindex $item 0]) &&
([lindex $selItem 1] == [lindex $item 1])} {
$w dchars [lindex $item 0] [lindex $item 1] sel.first sel.last
}
$w insert [lindex $item 0] [lindex $item 1] insert $c
}
proc insertKey {w c} {
if {! [binary scan $c {c} code] || ($code < 32) || ($code == 128)} {
return;
}
insertChar $w $c
}
proc setCur {w where} {
set item [$w focus]
if {[llength $item] != 0} {
$w cursor [lindex $item 0] [lindex $item 1] $where
}
}
proc moveCur {w dir} {
set item [$w focus]
if {[llength $item] != 0} {
set index [$w index [lindex $item 0] [lindex $item 1] insert]
$w cursor [lindex $item 0] [lindex $item 1] [expr $index + $dir]
}
}
proc startSel {w x y} {
set part [$w currentpart t]
$w cursor current $part @$x,$y
$w focus current $part
focus $w
$w select from current $part @$x,$y
}
proc extendSel {w x y} {
set part [$w currentpart t]
$w select to current $part @$x,$y
}
proc textDel {w dir} {
set item [$w focus]
set selItem [$w select item]
if {[llength $item] == 0} {
return;
}
if {([llength $selItem] != 0) &&
([lindex $selItem 0] == [lindex $item 0]) &&
([lindex $selItem 1] == [lindex $item 1])} {
$w dchars [lindex $item 0] [lindex $item 1] sel.first sel.last
} else {
set ind [expr [$w index [lindex $item 0] [lindex $item 1] insert] + $dir]
if { $ind >= 0 } {
$w dchars [lindex $item 0] [lindex $item 1] $ind $ind
}
}
}
package provide zincText 1.0
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