imLcFlt.c revision e9fcaa8a 
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
49    if(ev->xkey.keycode == 0)
50	return (False);
51
52    XLookupString((XKeyEvent *)ev, buf, sizeof(buf), &keysym, NULL);
53
54    if(IsModifierKey(keysym))
55	return (False);
56
57    if(keysym >= XK_braille_dot_1 && keysym <= XK_braille_dot_8) {
58	if(ev->type == KeyPress) {
59	    ic->private.local.brl_pressed |=
60		1<<(keysym-XK_braille_dot_1);
61	} else {
62	    if(!ic->private.local.brl_committing
63		    || ev->xkey.time - ic->private.local.brl_release_start > 300) {
64	    	ic->private.local.brl_committing = ic->private.local.brl_pressed;
65		ic->private.local.brl_release_start = ev->xkey.time;
66	    }
67	    ic->private.local.brl_pressed &= ~(1<<(keysym-XK_braille_dot_1));
68	    if(!ic->private.local.brl_pressed) {
69		if(ic->private.local.brl_committing) {
70		    ic->private.local.brl_committed =
71			ic->private.local.brl_committing;
72		    ic->private.local.composed = 0;
73		    ev->type = KeyPress;
74		    ev->xkey.keycode = 0;
75		    _XPutBackEvent(d, ev);
76		}
77	    }
78	}
79	return(True);
80    }
81
82    if(   (ev->type != KeyPress)
83       || (((Xim)ic->core.im)->private.local.top == 0 ) )
84	return(False);
85
86    for(t = ic->private.local.context; t; t = b[t].next) {
87	if(((ev->xkey.state & b[t].modifier_mask) == b[t].modifier) &&
88	   (keysym == b[t].keysym))
89	    break;
90    }
91
92    if(t) { /* Matched */
93	if(b[t].succession) { /* Intermediate */
94	    ic->private.local.context = b[t].succession;
95	    return(True);
96	} else { /* Terminate (reached to leaf) */
97	    ic->private.local.composed = t;
98	    ic->private.local.brl_committed = 0;
99	    /* return back to client KeyPressEvent keycode == 0 */
100	    ev->xkey.keycode = 0;
101	    XPutBackEvent(d, ev);
102	    /* initialize internal state for next key sequence */
103	    ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
104	    return(True);
105	}
106    } else { /* Unmatched */
107	if(ic->private.local.context == ((Xim)ic->core.im)->private.local.top) {
108	    return(False);
109	}
110	/* Error (Sequence Unmatch occured) */
111	/* initialize internal state for next key sequence */
112	ic->private.local.context = ((Xim)ic->core.im)->private.local.top;
113	return(True);
114    }
115}
116