aboutsummaryrefslogtreecommitdiffstats
path: root/widget_text.c
blob: 3b4f52e89af40a22c9459284135fedf79f516be4 (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
/* $Id: widget_text.c,v 1.28 2006/09/13 05:33:39 reinelt Exp $
 *
 * simple text widget handling
 *
 * Copyright (C) 2003, 2004 Michael Reinelt <reinelt@eunet.at>
 * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: widget_text.c,v $
 * Revision 1.28  2006/09/13 05:33:39  reinelt
 * plugin_file: return empty string if file cannot be read; widget_text: load property as 'string', not as variable (triggered an ugly bug with variable list reallocated)
 *
 * Revision 1.27  2006/08/13 18:14:03  harbaum
 * Added KVV plugin
 *
 * Revision 1.26  2006/08/13 11:38:20  reinelt
 * text widget uses dynamic properties
 *
 * Revision 1.25  2006/08/13 09:53:10  reinelt
 * dynamic properties added (used by 'style' of text widget)
 *
 * Revision 1.24  2006/01/23 06:17:18  reinelt
 * timer widget added
 *
 * Revision 1.23  2005/12/18 16:18:36  reinelt
 * GPO's added again
 *
 * Revision 1.22  2005/05/08 04:32:45  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.21  2005/01/18 06:30:24  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.20  2004/11/29 04:42:07  reinelt
 * removed the 99999 msec limit on widget update time (thanks to Petri Damsten)
 *
 * Revision 1.19  2004/06/26 12:05:00  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.18  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.17  2004/03/11 06:39:59  reinelt
 * big patch from Martin:
 * - reuse filehandles
 * - memory leaks fixed
 * - earlier busy-flag checking with HD44780
 * - reuse memory for strings in RESULT and hash
 * - netdev_fast to wavid time-consuming regex
 *
 * Revision 1.16  2004/03/08 16:26:26  reinelt
 * re-introduced \nnn (octal) characters in strings
 * text widgets can have a 'update' speed of 0 which means 'never'
 * (may be used for static content)
 *
 * Revision 1.15  2004/03/06 20:31:16  reinelt
 * Complete rewrite of the evaluator to get rid of the code
 * from mark Morley (because of license issues).
 * The new Evaluator does a pre-compile of expressions, and
 * stores them in trees. Therefore it should be reasonable faster...
 *
 * Revision 1.14  2004/03/03 03:47:04  reinelt
 * big patch from Martin Hejl:
 * - use qprintf() where appropriate
 * - save CPU cycles on gettimeofday()
 * - add quit() functions to free allocated memory
 * - fixed lots of memory leaks
 *
 * Revision 1.13  2004/02/18 06:39:20  reinelt
 * T6963 driver for graphic displays finished
 *
 * Revision 1.12  2004/02/09 19:49:38  nicowallmeier
 * Minor bugfix
 *
 * Revision 1.11  2004/01/30 20:57:56  reinelt
 * HD44780 patch from Martin Hejl
 * dmalloc integrated
 *
 * Revision 1.10  2004/01/29 04:40:03  reinelt
 * every .c file includes "config.h" now
 *
 * Revision 1.9  2004/01/23 04:54:04  reinelt
 * icon widget added (not finished yet!)
 *
 * Revision 1.8  2004/01/22 07:57:45  reinelt
 * several bugs fixed where segfaulting on layout>display
 * Crystalfontz driver optimized, 632 display already works
 *
 * Revision 1.7  2004/01/20 04:51:39  reinelt
 * moved generic stuff from drv_MatrixOrbital to drv_generic
 * implemented new-stylish bars which are nearly finished
 *
 * Revision 1.6  2004/01/15 07:47:02  reinelt
 * debian/ postinst and watch added (did CVS forget about them?)
 * evaluator: conditional expressions (a?b:c) added
 * text widget nearly finished
 *
 * Revision 1.5  2004/01/15 04:29:45  reinelt
 * moved lcd4linux.conf.sample to *.old
 * lcd4linux.conf.sample with new layout
 * new plugins 'loadavg' and 'meminfo'
 * text widget have pre- and postfix
 *
 * Revision 1.4  2004/01/14 11:33:00  reinelt
 * new plugin 'uname' which does what it's called
 * text widget nearly finished
 * first results displayed on MatrixOrbital
 *
 * Revision 1.3  2004/01/13 08:18:20  reinelt
 * timer queues added
 * liblcd4linux deactivated turing transformation to new layout
 *
 * Revision 1.2  2004/01/11 18:26:02  reinelt
 * further widget and layout processing
 *
 * Revision 1.1  2004/01/10 20:22:33  reinelt
 * added new function 'cfg_list()' (not finished yet)
 * added layout.c (will replace processor.c someday)
 * added widget_text.c (will be the first and most important widget)
 * modified lcd4linux.c so that old-style configs should work, too
 *
 */

/* 
 * exported functions:
 *
 * WIDGET_CLASS Widget_Text
 *   a simple text widget which 
 *   must be supported by all displays
 *
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

#include "debug.h"
#include "cfg.h"
#include "evaluator.h"
#include "property.h"
#include "timer.h"
#include "widget.h"
#include "widget_text.h"
#
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif


void widget_text_scroll(void *Self)
{
    WIDGET *W = (WIDGET *) Self;
    WIDGET_TEXT *T = W->data;

    char *prefix = P2S(&T->prefix);
    char *postfix = P2S(&T->postfix);

    char *string = T->string;

    int num, len, width, pad;
    char *src, *dst;

    num = 0;
    len = strlen(string);
    width = T->width - strlen(prefix) - strlen(postfix);
    if (width < 0)
	width = 0;

    switch (T->align) {
    case ALIGN_LEFT:
	pad = 0;
	break;
    case ALIGN_CENTER:
	pad = (width - len) / 2;
	if (pad < 0)
	    pad = 0;
	break;
    case ALIGN_RIGHT:
	pad = width - len;
	if (pad < 0)
	    pad = 0;
	break;
    case ALIGN_MARQUEE:
	pad = width - T->scroll;
	T->scroll++;
	if (T->scroll >= width + len)
	    T->scroll = 0;
	break;
    default:			/* not reached  */
	pad = 0;
    }

    dst = T->buffer;

    /* process prefix */
    src = prefix;
    while (num < T->width) {
	if (*src == '\0')
	    break;
	*(dst++) = *(src++);
	num++;
    }

    src = string;

    /* pad blanks on the beginning */
    while (pad > 0 && num < T->width) {
	*(dst++) = ' ';
	num++;
	pad--;
    }

    /* skip src chars (marquee) */
    while (pad < 0) {
	src++;
	pad++;
    }

    /* copy content */
    while (num < T->width) {
	if (*src == '\0')
	    break;
	*(dst++) = *(src++);
	num++;
    }

    /* pad blanks on the end */
    src = postfix;
    len = strlen(src);
    while (num < T->width - len) {
	*(dst++) = ' ';
	num++;
    }

    /* process postfix */
    while (num < T->width) {
	if (*src == '\0')
	    break;
	*(dst++) = *(src++);
	num++;
    }

    *dst = '\0';

    /* finally, draw it! */
    if (W->class->draw)
	W->class->draw(W);
}



void widget_text_update(void *Self)
{
    WIDGET *W = (WIDGET *) Self;
    WIDGET_TEXT *T = W->data;
    char *string;
    int update = 0;

    /* evaluate prefix and postfix */
    update += property_eval(&T->prefix);
    update += property_eval(&T->postfix);

    /* evaluate value */
    property_eval(&T->value);

    /* string or number? */
    if (T->precision == 0xDEAD) {
	string = strdup(P2S(&T->value));
    } else {
	double number = P2N(&T->value);
	int width = T->width - strlen(P2S(&T->prefix)) - strlen(P2S(&T->postfix));
	int precision = T->precision;
	/* print zero bytes so we can specify NULL as target  */
	/* and get the length of the resulting string */
	int size = snprintf(NULL, 0, "%.*f", precision, number);
	/* number does not fit into field width: try to reduce precision */
	if (width < 0)
	    width = 0;
	if (size > width && precision > 0) {
	    int delta = size - width;
	    if (delta > precision)
		delta = precision;
	    precision -= delta;
	    size -= delta;
	    /* zero precision: omit decimal point, too */
	    if (precision == 0)
		size--;
	}
	/* number still doesn't fit: display '*****'  */
	if (size > width) {
	    string = malloc(width + 1);
	    memset(string, '*', width);
	    *(string + width) = '\0';
	} else {
	    string = malloc(size + 1);
	    snprintf(string, size + 1, "%.*f", precision, number);
	}
    }

    /* did the formatted string change? */
    if (T->string == NULL || strcmp(T->string, string) != 0) {
	update++;
	if (T->string)
	    free(T->string);
	T->string = string;
    } else {
	free(string);
    }

    /* text style */
    update += property_eval(&T->style);

    /* something has changed and should be updated */
    if (update) {
	/* reset marquee counter if content has changed */
	T->scroll = 0;
	/* if there's a marquee scroller active, it has its own */
	/* update callback timer, so we do nothing here; otherwise */
	/* we simply call this scroll callback directly */
	if (T->align != ALIGN_MARQUEE) {
	    widget_text_scroll(Self);
	}
    }

}


int widget_text_init(WIDGET * Self)
{
    char *section;
    char *c;
    WIDGET_TEXT *Text;

    /* prepare config section */
    /* strlen("Widget:")=7 */
    section = malloc(strlen(Self->name) + 8);
    strcpy(section, "Widget:");
    strcat(section, Self->name);

    Text = malloc(sizeof(WIDGET_TEXT));
    memset(Text, 0, sizeof(WIDGET_TEXT));

    /* load properties */
    property_load(section, "prefix", NULL, &Text->prefix);
    property_load(section, "expression", NULL, &Text->value);
    property_load(section, "postfix", NULL, &Text->postfix);
    property_load(section, "style", "'norm'", &Text->style);

    /* field width, default 10 */
    cfg_number(section, "width", 10, 0, -1, &(Text->width));

    /* precision: number of digits after the decimal point (default: none) */
    /* Note: this is the *maximum* precision on small values, */
    /* for larger values the precision may be reduced to fit into the field width. */
    /* The default value 0xDEAD is used to distinguish between numbers and strings: */
    /* if no precision is given, the result is always treated as a string. If a */
    /* precision is specified, the result is treated as a number. */
    cfg_number(section, "precision", 0xDEAD, 0, 80, &(Text->precision));

    /* field alignment: Left (default), Center, Right or Marquee */
    c = cfg_get(section, "align", "L");
    switch (toupper(*c)) {
    case 'L':
	Text->align = ALIGN_LEFT;
	break;
    case 'C':
	Text->align = ALIGN_CENTER;
	break;
    case 'R':
	Text->align = ALIGN_RIGHT;
	break;
    case 'M':
	Text->align = ALIGN_MARQUEE;
	break;
    default:
	error("widget %s has unknown alignment '%s', using 'Left'", section, c);
	Text->align = ALIGN_LEFT;
    }
    free(c);

    /* update interval (msec), default 1 sec, 0 stands for never */
    cfg_number(section, "update", 1000, 0, -1, &(Text->update));
    /* limit update interval to min 10 msec */
    if (Text->update > 0 && Text->update < 10)
	Text->update = 10;

    /* marquee scroller speed: interval (msec), default 500msec */
    if (Text->align == ALIGN_MARQUEE) {
	cfg_number(section, "speed", 500, 10, -1, &(Text->speed));
    }

    /* buffer */
    Text->buffer = malloc(Text->width + 1);

    free(section);
    Self->data = Text;

    /* add update timer, use one-shot if 'update' is zero */
    timer_add(widget_text_update, Self, Text->update, Text->update == 0);

    /* a marquee scroller has its own timer and callback */
    if (Text->align == ALIGN_MARQUEE) {
	timer_add(widget_text_scroll, Self, Text->speed, 0);
    }

    return 0;
}


int widget_text_quit(WIDGET * Self)
{
    WIDGET_TEXT *Text;
    if (Self) {
	Text = Self->data;
	if (Self->data) {
	    property_free(&Text->prefix);
	    property_free(&Text->value);
	    property_free(&Text->postfix);
	    property_free(&Text->style);
	    if (Text->string)
		free(Text->string);
	    if (Text->buffer)
		free(Text->buffer);
	    free(Self->data);
	    Self->data = NULL;
	}

    }
    return 0;

}



WIDGET_CLASS Widget_Text = {
  name:"text",
  type:WIDGET_TYPE_RC,
  init:widget_text_init,
  draw:NULL,
  quit:widget_text_quit,
};