summaryrefslogtreecommitdiffstats
path: root/unix/tkUnixKey.c
blob: b3f5b93a5ab357e92edf65b9b3578326836b3691 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
 * tkUnixKey.c --
 *
 *	This file contains routines for dealing with international keyboard
 *	input.
 *
 * Copyright (c) 1997 by Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkInt.h"
#include <X11/XKBlib.h>

/*
 * Prototypes for local functions defined in this file:
 */

/*
 *----------------------------------------------------------------------
 *
 * Tk_SetCaretPos --
 *
 *	This enables correct placement of the XIM caret. This is called by
 *	widgets to indicate their cursor placement. This is currently only
 *	used for over-the-spot XIM.
 *
 *----------------------------------------------------------------------
 */

void
Tk_SetCaretPos(
    Tk_Window tkwin,
    int x,
    int y,
    int height)
{
    TkWindow *winPtr = (TkWindow *) tkwin;
    TkDisplay *dispPtr = winPtr->dispPtr;

    if ((dispPtr->caret.winPtr == winPtr)
	    && (dispPtr->caret.x == x)
	    && (dispPtr->caret.y == y)
	    && (dispPtr->caret.height == height)) {
	return;
    }

    dispPtr->caret.winPtr = winPtr;
    dispPtr->caret.x = x;
    dispPtr->caret.y = y;
    dispPtr->caret.height = height;

    /*
     * Adjust the XIM caret position.
     */

#ifdef TK_USE_INPUT_METHODS
    if ((dispPtr->flags & TK_DISPLAY_USE_IM)
	    && (dispPtr->inputStyle & XIMPreeditPosition)
	    && (winPtr->inputContext != NULL)) {
	XVaNestedList preedit_attr;
	XPoint spot;

	spot.x = dispPtr->caret.x;
	spot.y = dispPtr->caret.y + dispPtr->caret.height;
	preedit_attr = XVaCreateNestedList(0, XNSpotLocation, &spot, (void *) NULL);
	XSetICValues(winPtr->inputContext, XNPreeditAttributes, preedit_attr,
		(void *) NULL);
	XFree(preedit_attr);
    }
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetString --
 *
 *	Retrieve the UTF string associated with a keyboard event.
 *
 * Results:
 *	Returns the UTF string.
 *
 * Side effects:
 *	Stores the input string in the specified Tcl_DString. Modifies the
 *	internal input state. This routine can only be called once for a given
 *	event.
 *
 *----------------------------------------------------------------------
 */

const char *
TkpGetString(
    TkWindow *winPtr,		/* Window where event occurred */
    XEvent *eventPtr,		/* X keyboard event. */
    Tcl_DString *dsPtr)		/* Initialized, empty string to hold result. */
{
    int len;
    Tcl_DString buf;
    TkKeyEvent *kePtr = (TkKeyEvent *) eventPtr;

    /*
     * If we have the value cached already, use it now. [Bug 1373712]
     */

    if (kePtr->charValuePtr != NULL) {
	Tcl_DStringSetLength(dsPtr, kePtr->charValueLen);
	memcpy(Tcl_DStringValue(dsPtr), kePtr->charValuePtr,
		(unsigned) kePtr->charValueLen+1);
	return Tcl_DStringValue(dsPtr);
    }

#ifdef TK_USE_INPUT_METHODS
    if ((winPtr->dispPtr->flags & TK_DISPLAY_USE_IM)
	    && (winPtr->inputContext != NULL)
	    && (eventPtr->type == KeyPress)) {
	Status status;

#if X_HAVE_UTF8_STRING
	Tcl_DStringSetLength(dsPtr, TCL_DSTRING_STATIC_SIZE-1);
	len = Xutf8LookupString(winPtr->inputContext, &eventPtr->xkey,
		Tcl_DStringValue(dsPtr), Tcl_DStringLength(dsPtr),
		&kePtr->keysym, &status);

	if (status == XBufferOverflow) {
	    /*
	     * Expand buffer and try again.
	     */

	    Tcl_DStringSetLength(dsPtr, len);
	    len = Xutf8LookupString(winPtr->inputContext, &eventPtr->xkey,
		    Tcl_DStringValue(dsPtr), Tcl_DStringLength(dsPtr),
		    &kePtr->keysym, &status);
	}
	if ((status != XLookupChars) && (status != XLookupBoth)) {
	    len = 0;
	}
	Tcl_DStringSetLength(dsPtr, len);
#else /* !X_HAVE_UTF8_STRING */
	/*
	 * Overallocate the dstring to the maximum stack amount.
	 */

	Tcl_DStringInit(&buf);
	Tcl_DStringSetLength(&buf, TCL_DSTRING_STATIC_SIZE-1);
	len = XmbLookupString(winPtr->inputContext, &eventPtr->xkey,
		Tcl_DStringValue(&buf), Tcl_DStringLength(&buf), 
                &kePtr->keysym, &status);

	/*
	 * If the buffer wasn't big enough, grow the buffer and try again.
	 */

	if (status == XBufferOverflow) {
	    Tcl_DStringSetLength(&buf, len);
	    len = XmbLookupString(winPtr->inputContext, &eventPtr->xkey,
		    Tcl_DStringValue(&buf), len, &kePtr->keysym, &status);
	}
	if ((status != XLookupChars) && (status != XLookupBoth)) {
	    len = 0;
	}
	Tcl_DStringSetLength(&buf, len);
	Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(&buf), len, dsPtr);
	Tcl_DStringFree(&buf);
#endif /* X_HAVE_UTF8_STRING */
    } else
#endif /* TK_USE_INPUT_METHODS */
    {
	/*
	 * Fall back to convert a keyboard event to a UTF-8 string using
	 * XLookupString. This is used when input methods are turned off and
	 * for KeyRelease events.
	 *
	 * Note: XLookupString() normally returns a single ISO Latin 1 or
	 * ASCII control character.
	 */

	Tcl_DStringInit(&buf);
	Tcl_DStringSetLength(&buf, TCL_DSTRING_STATIC_SIZE-1);
	len = XLookupString(&eventPtr->xkey, Tcl_DStringValue(&buf),
		TCL_DSTRING_STATIC_SIZE, &kePtr->keysym, 0);
	Tcl_DStringValue(&buf)[len] = '\0';

	if (len == 1) {
	    len = Tcl_UniCharToUtf((unsigned char) Tcl_DStringValue(&buf)[0],
		    Tcl_DStringValue(dsPtr));
	    Tcl_DStringSetLength(dsPtr, len);
	} else {
	    /*
	     * len > 1 should only happen if someone has called XRebindKeysym.
	     * Assume UTF-8.
	     */

	    Tcl_DStringSetLength(dsPtr, len);
	    strncpy(Tcl_DStringValue(dsPtr), Tcl_DStringValue(&buf), len);
	}
    }

    /*
     * Cache the string in the event so that if/when we return to this
     * function, we will be able to produce it without asking X. This stops us
     * from having to reenter the XIM engine. [Bug 1373712]
     */

    kePtr->charValuePtr = ckalloc(len + 1);
    kePtr->charValueLen = len;
    memcpy(kePtr->charValuePtr, Tcl_DStringValue(dsPtr), (unsigned) len + 1);
    return Tcl_DStringValue(dsPtr);
}

/*
 * When mapping from a keysym to a keycode, need information about the
 * modifier state tp be used so that when they call XkbKeycodeToKeysym taking
 * into account the xkey.state, they will get back the original keysym.
 */

void
TkpSetKeycodeAndState(
    Tk_Window tkwin,
    KeySym keySym,
    XEvent *eventPtr)
{
    Display *display = Tk_Display(tkwin);
    int state;
    KeyCode keycode;

    if (keySym == NoSymbol) {
	keycode = 0;
    } else {
	keycode = XKeysymToKeycode(display, keySym);
	if (keycode != 0) {
	    for (state = 0; state < 4; state++) {
		if (XkbKeycodeToKeysym(display, keycode, 0, state) == keySym){
		    if (state & 1) {
			eventPtr->xkey.state |= ShiftMask;
		    }
		    if (state & 2) {
			TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr;

			eventPtr->xkey.state |= dispPtr->modeModMask;
		    }
		    break;
		}
	    }
	}
    }
    eventPtr->xkey.keycode = keycode;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetKeySym --
 *
 *	Given an X KeyPress or KeyRelease event, map the keycode in the event
 *	into a KeySym.
 *
 * Results:
 *	The return value is the KeySym corresponding to eventPtr, or NoSymbol
 *	if no matching Keysym could be found.
 *
 * Side effects:
 *	In the first call for a given display, keycode-to-KeySym maps get
 *	loaded.
 *
 *----------------------------------------------------------------------
 */

KeySym
TkpGetKeySym(
    TkDisplay *dispPtr,		/* Display in which to map keycode. */
    XEvent *eventPtr)		/* Description of X event. */
{
    KeySym sym;
    int index;
    TkKeyEvent* kePtr = (TkKeyEvent*) eventPtr;

#ifdef TK_USE_INPUT_METHODS
    /* 
     * If input methods are active, we may already have determined a keysym.
     * Return it.
     */

    if (eventPtr->type == KeyPress && dispPtr
	    && (dispPtr->flags & TK_DISPLAY_USE_IM)) {
	if (kePtr->charValuePtr == NULL) {
	    Tcl_DString ds;
	    TkWindow *winPtr = (TkWindow *)
		Tk_IdToWindow(eventPtr->xany.display, eventPtr->xany.window);
	    Tcl_DStringInit(&ds);
	    (void) TkpGetString(winPtr, eventPtr, &ds);
	    Tcl_DStringFree(&ds);
	}
	if (kePtr->charValuePtr != NULL) {
	    return kePtr->keysym;
	}
    }
#endif

    /*
     * Refresh the mapping information if it's stale
     */

    if (dispPtr->bindInfoStale) {
	TkpInitKeymapInfo(dispPtr);
    }

    /*
     * Figure out which of the four slots in the keymap vector to use for this
     * key. Refer to Xlib documentation for more info on how this computation
     * works.
     */

    index = 0;
    if (eventPtr->xkey.state & dispPtr->modeModMask) {
	index = 2;
    }
    if ((eventPtr->xkey.state & ShiftMask)
	    || ((dispPtr->lockUsage != LU_IGNORE)
	    && (eventPtr->xkey.state & LockMask))) {
	index += 1;
    }
    sym = XkbKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode, 0,
	    index);

    /*
     * Special handling: if the key was shifted because of Lock, but lock is
     * only caps lock, not shift lock, and the shifted keysym isn't upper-case
     * alphabetic, then switch back to the unshifted keysym.
     */

    if ((index & 1) && !(eventPtr->xkey.state & ShiftMask)
	    && (dispPtr->lockUsage == LU_CAPS)) {
	if (!(((sym >= XK_A) && (sym <= XK_Z))
		|| ((sym >= XK_Agrave) && (sym <= XK_Odiaeresis))
		|| ((sym >= XK_Ooblique) && (sym <= XK_Thorn)))) {
	    index &= ~1;
	    sym = XkbKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode,
		    0, index);
	}
    }

    /*
     * Another bit of special handling: if this is a shifted key and there is
     * no keysym defined, then use the keysym for the unshifted key.
     */

    if ((index & 1) && (sym == NoSymbol)) {
	sym = XkbKeycodeToKeysym(dispPtr->display, eventPtr->xkey.keycode,
		0, index & ~1);
    }
    return sym;
}

/*
 *--------------------------------------------------------------
 *
 * TkpInitKeymapInfo --
 *
 *	This function is invoked to scan keymap information to recompute stuff
 *	that's important for binding, such as the modifier key (if any) that
 *	corresponds to "mode switch".
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Keymap-related information in dispPtr is updated.
 *
 *--------------------------------------------------------------
 */

void
TkpInitKeymapInfo(
    TkDisplay *dispPtr)		/* Display for which to recompute keymap
				 * information. */
{
    XModifierKeymap *modMapPtr;
    KeyCode *codePtr;
    KeySym keysym;
    int count, i, j, max, arraySize;
#define KEYCODE_ARRAY_SIZE 20

    dispPtr->bindInfoStale = 0;
    modMapPtr = XGetModifierMapping(dispPtr->display);

    /*
     * Check the keycodes associated with the Lock modifier. If any of them is
     * associated with the XK_Shift_Lock modifier, then Lock has to be
     * interpreted as Shift Lock, not Caps Lock.
     */

    dispPtr->lockUsage = LU_IGNORE;
    codePtr = modMapPtr->modifiermap + modMapPtr->max_keypermod*LockMapIndex;
    for (count = modMapPtr->max_keypermod; count > 0; count--, codePtr++) {
	if (*codePtr == 0) {
	    continue;
	}
	keysym = XkbKeycodeToKeysym(dispPtr->display, *codePtr, 0, 0);
	if (keysym == XK_Shift_Lock) {
	    dispPtr->lockUsage = LU_SHIFT;
	    break;
	}
	if (keysym == XK_Caps_Lock) {
	    dispPtr->lockUsage = LU_CAPS;
	    break;
	}
    }

    /*
     * Look through the keycodes associated with modifiers to see if the the
     * "mode switch", "meta", or "alt" keysyms are associated with any
     * modifiers. If so, remember their modifier mask bits.
     */

    dispPtr->modeModMask = 0;
    dispPtr->metaModMask = 0;
    dispPtr->altModMask = 0;
    codePtr = modMapPtr->modifiermap;
    max = 8 * modMapPtr->max_keypermod;
    for (i = 0; i < max; i++, codePtr++) {
	if (*codePtr == 0) {
	    continue;
	}
	keysym = XkbKeycodeToKeysym(dispPtr->display, *codePtr, 0, 0);
	if (keysym == XK_Mode_switch) {
	    dispPtr->modeModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
	}
	if ((keysym == XK_Meta_L) || (keysym == XK_Meta_R)) {
	    dispPtr->metaModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
	}
	if ((keysym == XK_Alt_L) || (keysym == XK_Alt_R)) {
	    dispPtr->altModMask |= ShiftMask << (i/modMapPtr->max_keypermod);
	}
    }

    /*
     * Create an array of the keycodes for all modifier keys.
     */

    if (dispPtr->modKeyCodes != NULL) {
	ckfree(dispPtr->modKeyCodes);
    }
    dispPtr->numModKeyCodes = 0;
    arraySize = KEYCODE_ARRAY_SIZE;
    dispPtr->modKeyCodes = ckalloc(KEYCODE_ARRAY_SIZE * sizeof(KeyCode));
    for (i = 0, codePtr = modMapPtr->modifiermap; i < max; i++, codePtr++) {
	if (*codePtr == 0) {
	    continue;
	}

	/*
	 * Make sure that the keycode isn't already in the array.
	 */

	for (j = 0; j < dispPtr->numModKeyCodes; j++) {
	    if (dispPtr->modKeyCodes[j] == *codePtr) {
		/*
		 * 'continue' the outer loop.
		 */

		goto nextModCode;
	    }
	}
	if (dispPtr->numModKeyCodes >= arraySize) {
	    KeyCode *newCodes;

	    /*
	     * Ran out of space in the array; grow it.
	     */

	    arraySize *= 2;
	    newCodes = ckalloc(arraySize * sizeof(KeyCode));
	    memcpy(newCodes, dispPtr->modKeyCodes,
		    dispPtr->numModKeyCodes * sizeof(KeyCode));
	    ckfree(dispPtr->modKeyCodes);
	    dispPtr->modKeyCodes = newCodes;
	}
	dispPtr->modKeyCodes[dispPtr->numModKeyCodes] = *codePtr;
	dispPtr->numModKeyCodes++;
    nextModCode:
	continue;
    }
    XFreeModifiermap(modMapPtr);
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */