summaryrefslogtreecommitdiff
path: root/desktop/browser_history.c
blob: c8a89629061c823f58cd55cc818f3c87e16769da (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
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
/*
 * Copyright 2006 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2005 Richard Wilson <info@tinct.net>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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, see <http://www.gnu.org/licenses/>.
 */

/**
 * \file
 * Browser history tree implementation.
 */

#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "utils/log.h"
#include "utils/utils.h"
#include "netsurf/layout.h"
#include "netsurf/content.h"
#include "content/hlcache.h"
#include "content/urldb.h"
#include "netsurf/bitmap.h"

#include "desktop/gui_internal.h"
#include "desktop/browser_history.h"
#include "desktop/browser_private.h"

#define WIDTH 100
#define HEIGHT 86
#define RIGHT_MARGIN 50
#define BOTTOM_MARGIN 30


/**
 * Clone a history entry
 *
 * \param history opaque history structure, as returned by history_create()
 * \param entry entry to clone
 * \return A cloned history entry or NULL on error
 */
static struct history_entry *
browser_window_history__clone_entry(struct history *history,
				    struct history_entry *entry)
{
	struct history_entry *child;
	struct history_entry *new_child;
	struct history_entry *prev = NULL;
	struct history_entry *new_entry;

	assert(entry);
	assert(entry->page.url);
	assert(entry->page.title);

	/* clone the entry */
	new_entry = calloc(1, sizeof *entry);
	if (!new_entry) {
		return NULL;
	}

	/* copy page information */
	new_entry->page.title = strdup(entry->page.title);
	if (new_entry->page.title == NULL) {
		free(new_entry);
		return NULL;
	}

	new_entry->page.url = nsurl_ref(entry->page.url);
	if (new_entry->page.url == NULL) {
		free(new_entry->page.title);
		free(new_entry);
		return NULL;
	}

	if (entry->page.frag_id == NULL) {
		new_entry->page.frag_id = NULL;
	} else {
		new_entry->page.frag_id = lwc_string_ref(entry->page.frag_id);
		if (new_entry->page.frag_id == NULL) {
			nsurl_unref(new_entry->page.url);
			free(new_entry);
			return NULL;
		}
	}

	if (entry->page.bitmap == NULL) {
		new_entry->page.bitmap = NULL;
	} else {
		/* create a new bitmap and copy original into it */
		unsigned char *bmsrc_data;
		unsigned char *bmdst_data;
		size_t bmsize;

		new_entry->page.bitmap = guit->bitmap->create(WIDTH, HEIGHT,
						BITMAP_NEW | BITMAP_OPAQUE);

		if (new_entry->page.bitmap != NULL) {
			bmsrc_data = guit->bitmap->get_buffer(entry->page.bitmap);
			bmdst_data = guit->bitmap->get_buffer(new_entry->page.bitmap);
			bmsize = guit->bitmap->get_rowstride(new_entry->page.bitmap) *
				guit->bitmap->get_height(new_entry->page.bitmap);
			memcpy(bmdst_data, bmsrc_data, bmsize);
		}
	}

	/* copy tree values */
	new_entry->back = entry->back;
	new_entry->next = entry->next;
	new_entry->forward = entry->forward;
	new_entry->forward_pref = entry->forward_pref;
	new_entry->forward_last = entry->forward_last;

	/* recurse for all children */
	for (child = new_entry->forward; child != NULL; child = child->next) {
		new_child = browser_window_history__clone_entry(history, child);
		if (new_child == NULL) {
			nsurl_unref(new_entry->page.url);
			if (new_entry->page.frag_id) {
				lwc_string_unref(new_entry->page.frag_id);
			}
			free(new_entry->page.title);
			if (entry->page.bitmap != NULL) {
				guit->bitmap->destroy(entry->page.bitmap);
			}
			free(new_entry);
			return NULL;
		}

		new_child->back = new_entry;
		if (prev)
			prev->next = new_child;
		if (new_entry->forward == child)
			new_entry->forward = new_child;
		if (new_entry->forward_pref == child)
			new_entry->forward_pref = new_child;
		if (new_entry->forward_last == child)
			new_entry->forward_last = new_child;
		prev = new_child;
	}

	/* update references */
	if (history->current == entry) {
		history->current = new_entry;
	}

	return new_entry;
}


/**
 * Free an entry in the tree recursively.
 */

static void browser_window_history__free_entry(struct history_entry *entry)
{
	if (entry != NULL) {
		browser_window_history__free_entry(entry->forward);
		browser_window_history__free_entry(entry->next);

		nsurl_unref(entry->page.url);
		if (entry->page.frag_id) {
			lwc_string_unref(entry->page.frag_id);
		}
		free(entry->page.title);
		if (entry->page.bitmap != NULL) {
			guit->bitmap->destroy(entry->page.bitmap);
		}
		free(entry);
	}
}


/**
 * Recursively position a subtree.
 *
 * \param  history  history being laid out
 * \param  entry    subtree to position
 * \param  x        x position for entry
 * \param  y        smallest available y
 * \return  greatest y used by subtree
 */

static int browser_window_history__layout_subtree(struct history *history,
		struct history_entry *entry, int x, int y)
{
	struct history_entry *child;
	int y1 = y;

	if (history->width < x + WIDTH)
		history->width = x + WIDTH;

	if (!entry->forward) {
		entry->x = x;
		entry->y = y;
		return y + HEIGHT;
	}

	/* layout child subtrees below each other */
	for (child = entry->forward; child; child = child->next) {
		y1 = browser_window_history__layout_subtree(history, child,
				x + WIDTH + RIGHT_MARGIN, y1);
		if (child->next)
			y1 += BOTTOM_MARGIN;
	}

	/* place ourselves in the middle */
	entry->x = x;
	entry->y = (y + y1) / 2 - HEIGHT / 2;

	return y1;
}


/**
 * Compute node positions.
 *
 * \param  history  history to layout
 *
 * Each node's x and y are filled in.
 */

static void browser_window_history__layout(struct history *history)
{
	if (!history)
		return;

	history->width = 0;
	if (history->start)
		history->height = browser_window_history__layout_subtree(
				history, history->start,
				RIGHT_MARGIN / 2, BOTTOM_MARGIN / 2);
	else
		history->height = 0;

	history->width += RIGHT_MARGIN / 2;
	history->height += BOTTOM_MARGIN / 2;
}





/**
 * Enumerate subentries in history
 * See also history_enumerate()
 *
 * \param	bw		The browser window to enumerate history of
 * \param	entry		entry to start enumeration at
 * \param	cb			callback function
 * \param	ud			context pointer passed to cb
 * \return	true to continue enumeration, false to cancel
 */
static bool browser_window_history__enumerate_entry(
		const struct browser_window *bw,
		const struct history_entry *entry,
		browser_window_history_enumerate_cb cb,
		void *ud)
{
	const struct history_entry *child;

	if (!cb(bw, entry->x, entry->y,
			entry->x + WIDTH, entry->y + HEIGHT,
			entry, ud))
		return false;

	for (child = entry->forward; child; child = child->next) {
		if (!browser_window_history__enumerate_entry(bw, child,
				cb, ud))
			return false;
	}

	return true;
}


/* -------------------------------------------------------------------------- */


/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_create(struct browser_window *bw)
{
	struct history *history;

	bw->history = NULL;

	history = calloc(1, sizeof *history);
	if (history == NULL) {
		return NSERROR_NOMEM;
	}

	history->width = RIGHT_MARGIN / 2;
	history->height = BOTTOM_MARGIN / 2;

	bw->history = history;

	return NSERROR_OK;
}


/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_clone(const struct browser_window *existing,
		struct browser_window *clone)
{
	struct history *new_history;

	clone->history = NULL;

	if (existing == NULL || existing->history == NULL ||
			existing->history->start == NULL)
		/* Nothing to clone, create new history for clone window */
		return browser_window_history_create(clone);

	/* Make cloned history */
	new_history = malloc(sizeof *new_history);
	if (!new_history)
		return NSERROR_NOMEM;

	clone->history = new_history;
	memcpy(new_history, existing->history, sizeof *new_history);

	new_history->start = browser_window_history__clone_entry(new_history,
			new_history->start);
	if (!new_history->start) {
		NSLOG(netsurf, INFO, "Insufficient memory to clone history");
		browser_window_history_destroy(clone);
		clone->history = NULL;
		return NSERROR_NOMEM;
	}

	return NSERROR_OK;
}


/* exported interface documented in desktop/browser_history.h */
nserror
browser_window_history_add(struct browser_window *bw,
			   struct hlcache_handle *content,
			   lwc_string *frag_id)
{
	struct history *history;
	struct history_entry *entry;
	char *title;
	nserror ret;

	assert(bw);
	assert(bw->history);
	assert(content);

	history = bw->history;

	entry = malloc(sizeof *entry);
	if (entry == NULL) {
		return NSERROR_NOMEM;
	}

	/* page information */
	title = strdup(content_get_title(content));
	if (title == NULL) {
		free(entry);
		return NSERROR_NOMEM;
	}

	entry->page.url = nsurl_ref(hlcache_handle_get_url(content));
	entry->page.frag_id = frag_id ? lwc_string_ref(frag_id) : NULL;
	entry->page.title = title;

	/* create thumbnail for localhistory view */
	NSLOG(netsurf, DEBUG,
	      "Creating thumbnail for %s", nsurl_access(entry->page.url));

	entry->page.bitmap = guit->bitmap->create(WIDTH, HEIGHT,
			BITMAP_NEW | BITMAP_CLEAR_MEMORY | BITMAP_OPAQUE);
	if (entry->page.bitmap != NULL) {
		ret = guit->bitmap->render(entry->page.bitmap, content);
		if (ret != NSERROR_OK) {
			/* Thumbnail render failed */
			NSLOG(netsurf, WARNING, "Thumbnail render failed");
		}
	}

	/* insert into tree */
	entry->back = history->current;
	entry->next = NULL;
	entry->forward = entry->forward_pref = entry->forward_last = NULL;
	entry->children = 0;

	if (history->current) {
		if (history->current->forward_last) {
			history->current->forward_last->next = entry;
		} else {
			history->current->forward = entry;
		}
		history->current->forward_pref = entry;
		history->current->forward_last = entry;
		history->current->children++;
	} else {
		history->start = entry;
	}
	history->current = entry;

	browser_window_history__layout(history);

	return NSERROR_OK;
}


/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_update(struct browser_window *bw,
		struct hlcache_handle *content)
{
	struct history *history;
	char *title;

	assert(bw != NULL);

	history = bw->history;

	if (!history ||
	    !history->current ||
	    !history->current->page.bitmap) {
		return NSERROR_INVALID;
	}

	assert(history->current->page.url);
	assert(history->current->page.title);

	title = strdup(content_get_title(content));
	if (title == NULL) {
		return NSERROR_NOMEM;
	}

	free(history->current->page.title);
	history->current->page.title = title;

	if (history->current->page.bitmap != NULL) {
		guit->bitmap->render(history->current->page.bitmap, content);
	}

	return NSERROR_OK;
}



/* exported interface documented in desktop/browser_history.h */
void browser_window_history_destroy(struct browser_window *bw)
{
	assert(bw != NULL);

	if (bw->history == NULL)
		return;

	browser_window_history__free_entry(bw->history->start);
	free(bw->history);

	bw->history = NULL;
}



/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_back(struct browser_window *bw, bool new_window)
{
	if (!bw || !bw->history || !bw->history->current ||
	    !bw->history->current->back) {
		return NSERROR_BAD_PARAMETER;
	}
	return browser_window_history_go(bw, bw->history->current->back,
					 new_window);
}



/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_forward(struct browser_window *bw,
				       bool new_window)
{
	if (!bw || !bw->history || !bw->history->current ||
	    !bw->history->current->forward_pref) {
		return NSERROR_BAD_PARAMETER;
	}
	return browser_window_history_go(bw, bw->history->current->forward_pref,
					 new_window);
}


/* exported interface documented in desktop/browser_history.h */
bool browser_window_history_back_available(struct browser_window *bw)
{
	return (bw && bw->history && bw->history->current &&
			bw->history->current->back);
}


/* exported interface documented in desktop/browser_history.h */
bool browser_window_history_forward_available(struct browser_window *bw)
{
	return (bw && bw->history && bw->history->current &&
			bw->history->current->forward_pref);
}

/* exported interface documented in desktop/browser_history.h */
nserror
browser_window_history_get_thumbnail(struct browser_window *bw,
				 struct bitmap **bitmap_out)
{
	struct bitmap *bitmap;

	if (!bw || !bw->history || !bw->history->current) {
		return NSERROR_INVALID;
	}

	if (bw->history->current->page.bitmap == NULL) {
		bitmap = content_get_bitmap(bw->current_content);
	} else {
		bitmap = bw->history->current->page.bitmap;
	}

	*bitmap_out = bitmap;

	return NSERROR_OK;
}

/* exported interface documented in desktop/browser_history.h */
nserror browser_window_history_go(struct browser_window *bw,
		struct history_entry *entry, bool new_window)
{
	struct history *history;
	nsurl *url;
	struct history_entry *current;
	nserror error;

	assert(bw != NULL);
	history = bw->history;

	if (entry->page.frag_id) {
		error = nsurl_refragment(entry->page.url,
				entry->page.frag_id, &url);

		if (error != NSERROR_OK) {
			return error;
		}
	} else {
		url = nsurl_ref(entry->page.url);
	}

	if (new_window) {
		current = history->current;
		history->current = entry;

		error = browser_window_create(BW_CREATE_CLONE,
				url, NULL, bw, NULL);
		history->current = current;
	} else {
		history->current = entry;
		error = browser_window_navigate(bw, url, NULL,
				BW_NAVIGATE_NONE, NULL, NULL, NULL);
	}

	nsurl_unref(url);

	return error;
}


/* exported interface documented in desktop/browser_history.h */
void browser_window_history_enumerate_forward(const struct browser_window *bw,
		browser_window_history_enumerate_cb cb, void *user_data)
{
	struct history_entry *e;

	if (bw == NULL || bw->history == NULL || bw->history->current == NULL)
		return;

	e = bw->history->current->forward_pref;
	for (; e != NULL; e = e->forward_pref) {
		if (!cb(bw, e->x, e->y, e->x + WIDTH, e->y + HEIGHT,
				e, user_data))
			break;
	}
}


/* exported interface documented in desktop/browser_history.h */
void browser_window_history_enumerate_back(const struct browser_window *bw,
		browser_window_history_enumerate_cb cb, void *user_data)
{
	struct history_entry *e;

	if (bw == NULL || bw->history == NULL || bw->history->current == NULL)
		return;

	for (e = bw->history->current->back; e != NULL; e = e->back) {
		if (!cb(bw, e->x, e->y, e->x + WIDTH, e->y + HEIGHT,
				e, user_data))
			break;
	}
}


/* exported interface documented in desktop/browser_history.h */
void browser_window_history_enumerate(const struct browser_window *bw,
		browser_window_history_enumerate_cb cb, void *user_data)
{
	if (bw == NULL || bw->history == NULL)
		return;
	browser_window_history__enumerate_entry(bw,
			bw->history->start, cb, user_data);
}


/* exported interface documented in desktop/browser_history.h */
nsurl *browser_window_history_entry_get_url(const struct history_entry *entry)
{
	return nsurl_ref(entry->page.url);
}


/* exported interface documented in desktop/browser_history.h */
const char *browser_window_history_entry_get_fragment_id(
		const struct history_entry *entry)
{
	return (entry->page.frag_id) ? lwc_string_data(entry->page.frag_id) : 0;
}


/* exported interface documented in desktop/browser_history.h */
const char *browser_window_history_entry_get_title(
		const struct history_entry *entry)
{
	return entry->page.title;
}