imLcFlt.c revision 57f47464 
1/******************************************************************
2
3              Copyright 1992 by Fuji Xerox Co., Ltd.
4              Copyright 1992, 1994 by FUJITSU LIMITED
5
6Permission to use, copy, modify, distribute, and sell this software
7and its documentation for any purpose is hereby granted without fee,
8provided that the above copyright notice appear in all copies and
9that both that copyright notice and this permission notice appear
10in supporting documentation, and that the name of Fuji Xerox,
11FUJITSU LIMITED not be used in advertising or publicity pertaining
12to distribution of the software without specific, written prior
13permission. Fuji Xerox, FUJITSU LIMITED make no representations
14about the suitability of this software for any purpose.
15It is provided "as is" without express or implied warranty.
16
17FUJI XEROX, FUJITSU LIMITED DISCLAIM ALL WARRANTIES WITH
18REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
19MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL FUJI XEROX,
20FUJITSU LIMITED BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
21DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA
22OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
23TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
24PERFORMANCE OF THIS SOFTWARE.
25
26  Author   : Kazunori Nishihara	Fuji Xerox
27  Modifier : Takashi Fujiwara   FUJITSU LIMITED
28                                fujiwara@a80.tech.yk.fujitsu.co.jp
29
30******************************************************************/
31
32#ifdef HAVE_CONFIG_H
33#include <config.h>
34#endif
35#include "Xlibint.h"
36#include <X11/keysym.h>
37#include "Xlcint.h"
38#include "Ximint.h"
39
40Bool
41_XimLocalFilter(Display *d, Window w, XEvent *ev, XPointer client_data)
42{
43    Xic		 ic = (Xic)client_data;
44    KeySym	 keysym;
45    static char	 buf[256];
46    DefTree	*b = ic->private.local.base.tree;
47    DTIndex	 t;
48    Bool	 braille = False;
49
50    if(ev->xkey.keycode == 0)
51	return (False);
52
53    XLookupString((XKeyEvent *)ev, buf, sizeof(buf), &keysym, NULL);
54
55    if(IsModifierKey(keysym))
56	return (False);
57
58    if(keysym >= XK_braille_dot_1 && keysym <= XK_braille_dot_8) {
59	if(ev->type == KeyPress) {
60	    ic->private.local.brl_pressed |=
61		1<<(keysym-XK_braille_dot_1);
62	    return(True);
63	} else {
64	    if(!ic->private.local.brl_committing
65		    || ev->xkey.time - ic->private.local.brl_release_start > 300) {
66	    	ic->private.local.brl_committing = ic->private.local.brl_pressed;
67		ic->private.local.brl_release_start = ev->xkey.time;
68	    }
69	    ic->private.local.brl_pressed &= ~(1<<(keysym-XK_braille_dot_1));
70	    if(!ic->private.local.brl_pressed && ic->private.local.brl_committing) {
71		/* Commited a braille pattern, let it go through compose tree */
72		keysym = XK_braille_blank | ic->private.local.brl_committing;
73		ev->type = KeyPress;
74		braille = True;
75	    } else {
76	        return(True);
77	    }
78	}
79    }
80
81    if(   (ev->type != KeyPress)
82       || (((Xim)ic->core.im)->private.local.top == 0 ) )
83	goto emit_braille;
84
85    for(t = ic->private.local.context; t; t = b[t].next) {
86	if(((ev->xkey.state & b[t].modifier_mask) == b[t].modifier) &&
87	   (keysym == b[t].keysym))
88	    break;
89    }
90
91    if(t) { /* Matched */
92	if(b[t].succession) { /* Intermediate */
93	    ic->private.local.context = b[t].succession;
94	    return(True);
95	} else { /* Terminate (reached to leaf) */
96	    ic->private.local.composed = t;
97	    ic->private.local.brl_committed = 0;
98	    /* return back to client KeyPressEvent keycode == 0 */
99	    ev->xkey.keycode = 0;
100	    XPutBackEvent(d, ev);
101	    /* initialize internal state for next key sequence */
102	    ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
103	    return(True);
104	}
105    } else { /* Unmatched */
106	if(ic->private.local.context == ((Xim)ic->core.im)->private.local.top) {
107	    goto emit_braille;
108	}
109	/* Error (Sequence Unmatch occured) */
110	/* initialize internal state for next key sequence */
111	ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
112	return(True);
113    }
114
115emit_braille:
116    if(braille) {
117	/* Braille pattern is not in compose tree, emit alone */
118	ic->private.local.brl_committed = ic->private.local.brl_committing;
119	ic->private.local.composed = 0;
120	ev->xkey.keycode = 0;
121	_XPutBackEvent(d, ev);
122	return(True);
123    }
124    return(False);
125}
126