imLcFlt.c revision b4ee4795 
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#define NEED_EVENTS
33#ifdef HAVE_CONFIG_H
34#include <config.h>
35#endif
36#include "Xlibint.h"
37#include <X11/keysym.h>
38#include "Xlcint.h"
39#include "Ximint.h"
40
41Bool
42_XimLocalFilter(Display *d, Window w, XEvent *ev, XPointer client_data)
43{
44    Xic		 ic = (Xic)client_data;
45    KeySym	 keysym;
46    static char	 buf[256];
47    DefTree	*b = ic->private.local.base.tree;
48    DTIndex	 t;
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	} else {
63	    if(!ic->private.local.brl_committing
64		    || ev->xkey.time - ic->private.local.brl_release_start > 300) {
65	    	ic->private.local.brl_committing = ic->private.local.brl_pressed;
66		ic->private.local.brl_release_start = ev->xkey.time;
67	    }
68	    ic->private.local.brl_pressed &= ~(1<<(keysym-XK_braille_dot_1));
69	    if(!ic->private.local.brl_pressed) {
70		if(ic->private.local.brl_committing) {
71		    ic->private.local.brl_committed =
72			ic->private.local.brl_committing;
73		    ic->private.local.composed = 0;
74		    ev->type = KeyPress;
75		    ev->xkey.keycode = 0;
76		    _XPutBackEvent(d, ev);
77		}
78	    }
79	}
80	return(True);
81    }
82
83    if(   (ev->type != KeyPress)
84       || (((Xim)ic->core.im)->private.local.top == 0 ) )
85	return(False);
86
87    for(t = ic->private.local.context; t; t = b[t].next) {
88	if(((ev->xkey.state & b[t].modifier_mask) == b[t].modifier) &&
89	   (keysym == b[t].keysym))
90	    break;
91    }
92
93    if(t) { /* Matched */
94	if(b[t].succession) { /* Intermediate */
95	    ic->private.local.context = b[t].succession;
96	    return(True);
97	} else { /* Terminate (reached to leaf) */
98	    ic->private.local.composed = t;
99	    ic->private.local.brl_committed = 0;
100	    /* return back to client KeyPressEvent keycode == 0 */
101	    ev->xkey.keycode = 0;
102	    XPutBackEvent(d, ev);
103	    /* initialize internal state for next key sequence */
104	    ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
105	    return(True);
106	}
107    } else { /* Unmatched */
108	if(ic->private.local.context == ((Xim)ic->core.im)->private.local.top) {
109	    return(False);
110	}
111	/* Error (Sequence Unmatch occured) */
112	/* initialize internal state for next key sequence */
113	ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
114	return(True);
115    }
116}
117