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//
// "$Id$"
//
// Character compose processing for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2009 by Bill Spitzak and others.
//
// This library 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 library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl.H>
#include <FL/x.H>
//
// MRS: Uncomment the following define to get the original (pre-1.1.2)
// dead key support code. The original code apparently did not
// work on Belgian keyboards.
//
//#define OLD_DEAD_KEY_CODE
#ifndef __APPLE__
static const char* const compose_pairs =
"=E _'f _\"..+ ++^ %%^S< OE ^Z ^''^^\"\"^-*- --~ TM^s> oe ^z:Y"
" ! % # $ y=| & : c a <<~ - r _ * +-2 3 ' u p . , 1 o >>141234? "
"`A'A^A~A:A*AAE,C`E'E^E:E`I'I^I:I-D~N`O'O^O~O:Ox O/`U'U^U:U'YTHss"
"`a'a^a~a:a*aae,c`e'e^e:e`i'i^i:i-d~n`o'o^o~o:o-:o/`u'u^u:u'yth:y";
#endif
#if !defined(WIN32) && defined(OLD_DEAD_KEY_CODE) // X only
// X dead-key lookup table. This turns a dead-key keysym into the
// first of two characters for one of the compose sequences. These
// keysyms start at 0xFE50.
// Win32 handles the dead keys before FLTK can see them. This is
// unfortunate, because you don't get the preview effect.
static char dead_keys[] = {
'`', // XK_dead_grave
'\'', // XK_dead_acute
'^', // XK_dead_circumflex
'~', // XK_dead_tilde
'_', // XK_dead_macron
0, // XK_dead_breve
'.', // XK_dead_abovedot
':', // XK_dead_diaeresis
'*', // XK_dead_abovering
0, // XK_dead_doubleacute
'v', // XK_dead_caron
',' // XK_dead_cedilla
// 0, // XK_dead_ogonek
// 0, // XK_dead_iota
// 0, // XK_dead_voiced_sound
// 0, // XK_dead_semivoiced_sound
// 0 // XK_dead_belowdot
};
#endif // !WIN32 && OLD_DEAD_KEY_CODE
#ifndef FL_DOXYGEN
int Fl::compose_state = 0;
#endif
#ifdef __APPLE__
// under Mac OS X character composition is handled by the OS
int Fl::compose(int& del) {
if(Fl::e_length == 0 || Fl::e_keysym == FL_Enter || Fl::e_keysym == FL_KP_Enter ||
Fl::e_keysym == FL_Tab || Fl::e_keysym == FL_Escape || Fl::e_state&FL_META || Fl::e_state&FL_CTRL) {
del = 0;
return 0;
}
if(Fl::compose_state) {
del = 1;
Fl::compose_state = 0;
}
else {
del = 0;
}
return 1;
}
#else
/** Any text editing widget should call this for each FL_KEYBOARD event.
Use of this function is very simple.
<p>If <i>true</i> is returned, then it has modified the
Fl::event_text() and Fl::event_length() to a set of <i>bytes</i> to
insert (it may be of zero length!). In will also set the "del"
parameter to the number of <i>bytes</i> to the left of the cursor to
delete, this is used to delete the results of the previous call to
Fl::compose().
<p>If <i>false</i> is returned, the keys should be treated as function
keys, and del is set to zero. You could insert the text anyways, if
you don't know what else to do.
<p>Though the current implementation returns immediately, future
versions may take quite awhile, as they may pop up a window or do
other user-interface things to allow characters to be selected.
*/
int Fl::compose(int& del) {
del = 0;
unsigned char ascii = (unsigned)e_text[0];
// Alt+letters are reserved for shortcuts. But alt+foreign letters
// has to be allowed, because some key layouts require alt to be held
// down in order to type them...
//
// OSX users sometimes need to hold down ALT for keys, so we only check
// for META on OSX...
if ((e_state & (FL_ALT|FL_META)) && !(ascii & 128)) return 0;
if (compose_state == 1) { // after the compose key
if ( // do not get distracted by any modifier keys
e_keysym==FL_Shift_L||
e_keysym==FL_Shift_R ||
e_keysym==FL_Alt_L ||
e_keysym==FL_Alt_R ||
e_keysym==FL_Meta_L ||
e_keysym==FL_Meta_R ||
e_keysym==FL_Control_R ||
e_keysym==FL_Control_L ||
e_keysym==FL_Menu
) return 0;
if (ascii == ' ') { // space turns into nbsp
int len = fl_utf8encode(0xA0, e_text);
e_text[len] = '\0';
e_length = len;
compose_state = 0;
return 1;
} else if (ascii < ' ' || ascii == 127) {
compose_state = 0;
return 0;
}
// see if it is either character of any pair:
for (const char *p = compose_pairs; *p; p += 2)
if (p[0] == ascii || p[1] == ascii) {
if (p[1] == ' ') {
int len = fl_utf8encode((p-compose_pairs)/2+0xA0, e_text);
e_text[len] = '\0';
e_length = len;
}
compose_state = ascii;
return 1;
}
if (e_length) { // compose key also "quotes" control characters
compose_state = 0;
return 1;
}
} else if (compose_state) { // second character of compose
char c1 = char(compose_state); // retrieve first character
// now search for the pair in either order:
for (const char *p = compose_pairs; *p; p += 2) {
if ( (p[0] == ascii && p[1] == c1) || (p[1] == ascii && p[0] == c1)) {
int len = fl_utf8encode((p-compose_pairs)/2+0xA0, e_text);
e_text[len] = '\0';
e_length = len;
del = 1; // delete the old character and insert new one
compose_state = 0;
return 1;
}
}
}
int i = e_keysym;
// See if they type the compose prefix key:
if (i == FL_Control_R || i == 0xff20/* Multi-Key */) {
compose_state = 1;
return 1;
}
#ifndef WIN32
// See if they typed a dead key. This gets it into the same state as
// typing prefix+accent:
if (i >= 0xfe50 && i <= 0xfe5b) {
# ifdef OLD_DEAD_KEY_CODE
ascii = dead_keys[i-0xfe50];
for (const char *p = compose_pairs; *p; p += 2)
if (p[0] == ascii) {
compose_state = ascii;
return 1;
}
# else
ascii = e_text[0];
for (const char *p = compose_pairs; *p; p += 2)
if (p[0] == ascii ||
(p[1] == ' ' && (p - compose_pairs) / 2 + 0xA0 == ascii)) {
compose_state = p[0];
return 1;
}
# endif // OLD_DEAD_KEY_CODE
compose_state = 0;
return 1;
}
#endif
// Only insert non-control characters:
if (e_length && (ascii & ~31 && ascii!=127)) {compose_state = 0; return 1;}
return 0;
}
#endif // __APPLE__
//
// End of "$Id$"
//
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