aboutsummaryrefslogblamecommitdiffstats
path: root/widgets/misc/e-selection-model.c
blob: e1f558f1e094770b25dcd0a43d1dce54712a4d5b (plain) (tree)
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
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806





































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                            
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-selection-model.c: a Selection Model
 *
 * Author:
 *   Christopher James Lahey <clahey@ximian.com>
 *
 * (C) 2000, 2001 Ximian, Inc.
 */
#include <config.h>
#include <gtk/gtksignal.h>
#include "e-selection-model.h"
#include "gal/util/e-util.h"
#include <gdk/gdkkeysyms.h>

#define ESM_CLASS(e) ((ESelectionModelClass *)((GtkObject *)e)->klass)

#define PARENT_TYPE gtk_object_get_type ()

#define ONES ((guint32) 0xffffffff)

#define BOX(n) ((n) / 32)
#define OFFSET(n) (31 - ((n) % 32))
#define BITMASK(n) ((guint32)(((guint32) 0x1) << OFFSET((n))))
#define BITMASK_LEFT(n) ((((n) % 32) == 0) ? 0 : (ONES << (32 - ((n) % 32))))
#define BITMASK_RIGHT(n) ((guint32)(((guint32) ONES) >> ((n) % 32)))

static GtkObjectClass *e_selection_model_parent_class;

static void esm_select_single_row (ESelectionModel *selection, int row);

enum {
    CURSOR_CHANGED,
    CURSOR_ACTIVATED,
    SELECTION_CHANGED,
    LAST_SIGNAL
};

static guint e_selection_model_signals [LAST_SIGNAL] = { 0, };

enum {
    ARG_0,
    ARG_SORTER,
    ARG_CURSOR_ROW,
    ARG_CURSOR_COL,
    ARG_SELECTION_MODE,
    ARG_CURSOR_MODE,
};

void
e_selection_model_insert_row(ESelectionModel *esm, int row)
{
    int box;
    int i;
    if(esm->row_count >= 0) {
        /* Add another word if needed. */
        if ((esm->row_count & 0x1f) == 0) {
            esm->selection = g_renew(gint, esm->selection, (esm->row_count >> 5) + 1);
            esm->selection[esm->row_count >> 5] = 0;
        }

        /* The box is the word that our row is in. */
        box = BOX(row);
        /* Shift all words to the right of our box right one bit. */
        for (i = esm->row_count >> 5; i > box; i--) {
            esm->selection[i] = (esm->selection[i] >> 1) | (esm->selection[i - 1] << 31);
        }

        /* Shift right half of box one bit to the right. */
        esm->selection[box] = (esm->selection[box] & BITMASK_LEFT(row)) | ((esm->selection[box] & BITMASK_RIGHT(row)) >> 1);
        esm->row_count ++;
    }
    if (esm->cursor_row >= row)
        esm->cursor_row ++;
}

void
e_selection_model_delete_row(ESelectionModel *esm, int row)
{
    int box;
    int i;
    int last;
    int selected = FALSE;
    if(esm->row_count >= 0) {
        guint32 bitmask;
        box = row >> 5;
        last = esm->row_count >> 5;

        /* Build bitmasks for the left and right half of the box */
        bitmask = BITMASK_RIGHT(row) >> 1;
        selected = e_selection_model_is_row_selected(esm, row);
        /* Shift right half of box one bit to the left. */
        esm->selection[box] = (esm->selection[box] & BITMASK_LEFT(row))| ((esm->selection[box] & bitmask) << 1);

        /* Shift all words to the right of our box left one bit. */
        if (box < last) {
            esm->selection[box] &= esm->selection[box + 1] >> 31;

            for (i = box + 1; i < last; i++) {
                esm->selection[i] = (esm->selection[i] << 1) | (esm->selection[i + 1] >> 31);
            }
            /* this over-runs our memory! */
            /*esm->selection[i] = esm->selection[i] << 1; */
        }
        esm->row_count --;
        /* Remove the last word if not needed. */
        if ((esm->row_count & 0x1f) == 0) {
            esm->selection = g_renew(gint, esm->selection, esm->row_count >> 5);
        }
        if (selected && esm->mode == GTK_SELECTION_SINGLE) {
            esm_select_single_row (esm, row > 0 ? row - 1 : 0);
        }
    }
    if (esm->cursor_row >= row && esm->cursor_row > 0)
        esm->cursor_row --;
}

inline static void
add_sorter(ESelectionModel *esm, ESorter *sorter)
{
    esm->sorter = sorter;
    if (sorter) {
        gtk_object_ref(GTK_OBJECT(sorter));
    }
}

inline static void
drop_sorter(ESelectionModel *esm)
{
    if (esm->sorter) {
        gtk_object_unref(GTK_OBJECT(esm->sorter));
    }
    esm->sorter = NULL;
}

static void
esm_destroy (GtkObject *object)
{
    ESelectionModel *esm;

    esm = E_SELECTION_MODEL (object);

    drop_sorter(esm);

    g_free(esm->selection);
}

static void
esm_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ESelectionModel *esm = E_SELECTION_MODEL (o);

    switch (arg_id){
    case ARG_SORTER:
        GTK_VALUE_OBJECT (*arg) = GTK_OBJECT(esm->sorter);
        break;

    case ARG_CURSOR_ROW:
        GTK_VALUE_INT(*arg) = esm->cursor_row;
        break;

    case ARG_CURSOR_COL:
        GTK_VALUE_INT(*arg) = esm->cursor_col;
        break;

    case ARG_SELECTION_MODE:
        GTK_VALUE_ENUM(*arg) = esm->mode;
        break;

    case ARG_CURSOR_MODE:
        GTK_VALUE_ENUM(*arg) = esm->cursor_mode;
        break;
    }
}

static void
esm_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    ESelectionModel *esm = E_SELECTION_MODEL (o);
    
    switch (arg_id){
    case ARG_SORTER:
        drop_sorter(esm);
        add_sorter(esm, GTK_VALUE_OBJECT (*arg) ? E_SORTER(GTK_VALUE_OBJECT (*arg)) : NULL);
        break;

    case ARG_CURSOR_ROW:
        e_selection_model_do_something(esm, GTK_VALUE_INT(*arg), esm->cursor_col, 0);
        break;

    case ARG_CURSOR_COL:
        e_selection_model_do_something(esm, esm->cursor_row, GTK_VALUE_INT(*arg), 0);
        break;

    case ARG_SELECTION_MODE:
        esm->mode = GTK_VALUE_ENUM(*arg);
        if (esm->mode == GTK_SELECTION_SINGLE) {
            e_selection_model_do_something(esm, esm->cursor_row, esm->cursor_col, 0);
        }
        break;

    case ARG_CURSOR_MODE:
        esm->cursor_mode = GTK_VALUE_ENUM(*arg);
        break;
    }
}

static void
e_selection_model_init (ESelectionModel *selection)
{
    selection->selection = NULL;
    selection->row_count = -1;
    selection->selection_start_row = 0;
    selection->cursor_row = -1;
    selection->cursor_col = -1;
    selection->mode = GTK_SELECTION_MULTIPLE;
    selection->cursor_mode = E_CURSOR_SIMPLE;
}

static void
e_selection_model_class_init (ESelectionModelClass *klass)
{
    GtkObjectClass *object_class;

    e_selection_model_parent_class = gtk_type_class (gtk_object_get_type ());

    object_class = GTK_OBJECT_CLASS(klass);

    object_class->destroy = esm_destroy;
    object_class->get_arg = esm_get_arg;
    object_class->set_arg = esm_set_arg;

    e_selection_model_signals [CURSOR_CHANGED] =
        gtk_signal_new ("cursor_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, cursor_changed),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    e_selection_model_signals [CURSOR_ACTIVATED] =
        gtk_signal_new ("cursor_activated",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, cursor_activated),
                gtk_marshal_NONE__INT_INT,
                GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

    e_selection_model_signals [SELECTION_CHANGED] =
        gtk_signal_new ("selection_changed",
                GTK_RUN_LAST,
                object_class->type,
                GTK_SIGNAL_OFFSET (ESelectionModelClass, selection_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    klass->cursor_changed    = NULL;
    klass->cursor_activated  = NULL;
    klass->selection_changed = NULL;

    gtk_object_class_add_signals (object_class, e_selection_model_signals, LAST_SIGNAL);

    gtk_object_add_arg_type ("ESelectionModel::sorter", GTK_TYPE_OBJECT,
                 GTK_ARG_READWRITE, ARG_SORTER);
    gtk_object_add_arg_type ("ESelectionModel::cursor_row", GTK_TYPE_INT,
                 GTK_ARG_READWRITE, ARG_CURSOR_ROW);
    gtk_object_add_arg_type ("ESelectionModel::cursor_col", GTK_TYPE_INT,
                 GTK_ARG_READWRITE, ARG_CURSOR_COL);
    gtk_object_add_arg_type ("ESelectionModel::selection_mode", GTK_TYPE_ENUM,
                 GTK_ARG_READWRITE, ARG_SELECTION_MODE);
    gtk_object_add_arg_type ("ESelectionModel::cursor_mode", GTK_TYPE_ENUM,
                 GTK_ARG_READWRITE, ARG_CURSOR_MODE);
}

E_MAKE_TYPE(e_selection_model, "ESelectionModel", ESelectionModel,
        e_selection_model_class_init, e_selection_model_init, PARENT_TYPE);

/** 
 * e_selection_model_is_row_selected
 * @selection: #ESelectionModel to check
 * @n: The row to check
 *
 * This routine calculates whether the given row is selected.
 *
 * Returns: %TRUE if the given row is selected
 */
gboolean
e_selection_model_is_row_selected (ESelectionModel *selection,
                   gint                 n)
{
    if (selection->row_count < n)
        return 0;
    else
        return (selection->selection[BOX(n)] >> OFFSET(n)) & 0x1;
}

/** 
 * e_selection_model_foreach
 * @selection: #ESelectionModel to traverse
 * @callback: The callback function to call back.
 * @closure: The closure
 *
 * This routine calls the given callback function once for each
 * selected row, passing closure as the closure.
 */
void 
e_selection_model_foreach     (ESelectionModel *selection,
                   EForeachFunc callback,
                   gpointer closure)
{
    int i;
    int last = (selection->row_count + 31) / 32;
    for (i = 0; i < last; i++) {
        if (selection->selection[i]) {
            int j;
            guint32 value = selection->selection[i];
            for (j = 0; j < 32; j++) {
                if (value & 0x80000000) {
                    callback(i * 32 + j, closure);
                }
                value <<= 1;
            }
        }
    }
}

#define OPERATE(object, i,mask,grow) ((grow) ? (((object)->selection[(i)]) |= ((guint32) ~(mask))) : (((object)->selection[(i)]) &= (mask)))

static void
change_one_row(ESelectionModel *selection, int row, gboolean grow)
{
    int i;
    i = BOX(row);

    OPERATE(selection, i, ~BITMASK(row), grow);
}

static void
change_selection(ESelectionModel *selection, int start, int end, gboolean grow)
{
    int i, last;
    if (start != end) {
        if (selection->sorter && e_sorter_needs_sorting(selection->sorter)) {
            for ( i = start; i < end; i++) {
                change_one_row(selection, e_sorter_sorted_to_model(selection->sorter, i), grow);
            }
        } else {
            i = BOX(start);
            last = BOX(end);

            if (i == last) {
                OPERATE(selection, i, BITMASK_LEFT(start) | BITMASK_RIGHT(end), grow);
            } else {
                OPERATE(selection, i, BITMASK_LEFT(start), grow);
                if (grow)
                    for (i ++; i < last; i++)
                        selection->selection[i] = ONES;
                else
                    for (i ++; i < last; i++)
                        selection->selection[i] = 0;
                OPERATE(selection, i, BITMASK_RIGHT(end), grow);
            }
        }
    }
}

static void
esm_select_single_row (ESelectionModel *selection, int row)
{
    int i;
    for (i = 0; i < ((selection->row_count + 31) / 32); i++) {
        if (!((i == BOX(row) && selection->selection[i] == BITMASK(row)) ||
              (i != BOX(row) && selection->selection[i] == 0))) {
            g_free(selection->selection);
            selection->selection = g_new0(gint, (selection->row_count + 31) / 32);
            selection->selection[BOX(row)] = BITMASK(row);

            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals [SELECTION_CHANGED]);
            break;
        }
    }

    selection->selection_start_row = row;
}

static void
esm_toggle_single_row (ESelectionModel *selection, int row)
{
    if (selection->selection[BOX(row)] & BITMASK(row))
        selection->selection[BOX(row)] &= ~BITMASK(row);
    else
        selection->selection[BOX(row)] |= BITMASK(row);
    selection->selection_start_row = row;
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals [SELECTION_CHANGED]);
}

static void
esm_move_selection_end (ESelectionModel *selection, int row)
{
    int old_start;
    int old_end;
    int new_start;
    int new_end;
    if (selection->sorter && e_sorter_needs_sorting(selection->sorter)) {
        old_start = MIN (e_sorter_model_to_sorted(selection->sorter, selection->selection_start_row),
                 e_sorter_model_to_sorted(selection->sorter, selection->cursor_row));
        old_end = MAX (e_sorter_model_to_sorted(selection->sorter, selection->selection_start_row),
                   e_sorter_model_to_sorted(selection->sorter, selection->cursor_row)) + 1;
        new_start = MIN (e_sorter_model_to_sorted(selection->sorter, selection->selection_start_row),
                 e_sorter_model_to_sorted(selection->sorter, row));
        new_end = MAX (e_sorter_model_to_sorted(selection->sorter, selection->selection_start_row),
                   e_sorter_model_to_sorted(selection->sorter, row)) + 1;
    } else {
        old_start = MIN (selection->selection_start_row, selection->cursor_row);
        old_end = MAX (selection->selection_start_row, selection->cursor_row) + 1;
        new_start = MIN (selection->selection_start_row, row);
        new_end = MAX (selection->selection_start_row, row) + 1;
    }
    /* This wouldn't work nearly so smoothly if one end of the selection weren't held in place. */
    if (old_start < new_start)
        change_selection(selection, old_start, new_start, FALSE);
    if (new_start < old_start)
        change_selection(selection, new_start, old_start, TRUE);
    if (old_end < new_end)
        change_selection(selection, old_end, new_end, TRUE);
    if (new_end < old_end)
        change_selection(selection, new_end, old_end, FALSE);
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals [SELECTION_CHANGED]);
}

static void
esm_set_selection_end (ESelectionModel *selection, int row)
{
    esm_select_single_row(selection, selection->selection_start_row);
    selection->cursor_row = selection->selection_start_row;
    esm_move_selection_end(selection, row);
}

/** 
 * e_selection_model_do_something
 * @selection: #ESelectionModel to do something to.
 * @row: The row to do something in.
 * @col: The col to do something in.
 * @state: The state in which to do something.
 *
 * This routine does whatever is appropriate as if the user clicked
 * the mouse in the given row and column.
 */
void
e_selection_model_do_something (ESelectionModel *selection,
                      guint                 row,
                      guint                 col,
                      GdkModifierType       state)
{
    gint shift_p = state & GDK_SHIFT_MASK;
    gint ctrl_p = state & GDK_CONTROL_MASK;

    if (row == -1 && col != -1)
        row = 0;
    if (col == -1 && row != -1)
        col = 0;

    if (selection->row_count < 0) {
        selection->row_count = e_selection_model_get_row_count(selection);
        if (selection->row_count < 0)
            return;
        g_free(selection->selection);
        selection->selection = g_new0(gint, (selection->row_count + 31) / 32);
    }
    if (selection->row_count >= 0 && row < selection->row_count) {
        switch (selection->mode) {
        case GTK_SELECTION_SINGLE:
            esm_select_single_row (selection, row);
            break;
        case GTK_SELECTION_BROWSE:
        case GTK_SELECTION_MULTIPLE:
        case GTK_SELECTION_EXTENDED:
            if (shift_p) {
                esm_set_selection_end (selection, row);
            } else {
                if (ctrl_p) {
                    esm_toggle_single_row (selection, row);
                } else {
                    esm_select_single_row (selection, row);
                }
            }
            break;
        }
        if (selection->cursor_row != row ||
            selection->cursor_col != col) {
            selection->cursor_row = row;
            selection->cursor_col = col;
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], row, col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
        }
    }
}

/** 
 * e_selection_model_maybe_do_something
 * @selection: #ESelectionModel to do something to.
 * @row: The row to do something in.
 * @col: The col to do something in.
 * @state: The state in which to do something.
 *
 * If this row is selected, this routine just moves the cursor row and
 * column.  Otherwise, it does the same thing as
 * e_selection_model_do_something().  This is for being used on
 * right clicks and other events where if the user hit the selection,
 * they don't want it to change.
 */
void
e_selection_model_maybe_do_something      (ESelectionModel *selection,
                         guint                 row,
                         guint                 col,
                         GdkModifierType       state)
{
    if (e_selection_model_is_row_selected(selection, row)) {
        selection->cursor_row = row;
        selection->cursor_col = col;
    } else {
        e_selection_model_do_something(selection, row, col, state);
    }
}

static gint
move_selection (ESelectionModel *selection,
        gboolean              up,
        GdkModifierType       state)
{
    int row = selection->cursor_row;
    int col = selection->cursor_col;
    int cursor_activated = TRUE;

    gint shift_p = state & GDK_SHIFT_MASK;
    gint ctrl_p = state & GDK_CONTROL_MASK;

    row = e_sorter_model_to_sorted(selection->sorter, row);
    if (up)
        row--;
    else
        row++;
    if (row < 0)
        row = 0;
    if (row >= selection->row_count)
        row = selection->row_count - 1;
    row = e_sorter_sorted_to_model(selection->sorter, row);

    switch (selection->mode) {
    case GTK_SELECTION_BROWSE:
        if (shift_p) {
            esm_set_selection_end (selection, row);
        } else if (!ctrl_p) {
            esm_select_single_row (selection, row);
        } else
            cursor_activated = FALSE;
        break;
    case GTK_SELECTION_SINGLE:
    case GTK_SELECTION_MULTIPLE:
    case GTK_SELECTION_EXTENDED:
        esm_select_single_row (selection, row);
        break;
    }
    if (row != -1) {
        selection->cursor_row = row;
        gtk_signal_emit(GTK_OBJECT(selection),
                e_selection_model_signals[CURSOR_CHANGED], row, col);
        if (cursor_activated)
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], row, col);
    }
    return TRUE;
}

/** 
 * e_selection_model_key_press
 * @selection: #ESelectionModel to affect.
 * @key: The event.
 *
 * This routine does whatever is appropriate as if the user pressed
 * the given key.
 *
 * Returns: %TRUE if the #ESelectionModel used the key.
 */
gint
e_selection_model_key_press      (ESelectionModel *selection,
                    GdkEventKey          *key)
{
    switch (key->keyval) {
    case GDK_Up:
        return move_selection(selection, TRUE, key->state);
        break;
    case GDK_Down:
        return move_selection(selection, FALSE, key->state);
        break;
    case GDK_space:
    case GDK_KP_Space:
        if (selection->mode != GTK_SELECTION_SINGLE) {
            esm_toggle_single_row (selection, selection->cursor_row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], selection->cursor_row, selection->cursor_col);
            return TRUE;
        }
        break;
    case GDK_Return:
    case GDK_KP_Enter:
        if (selection->mode != GTK_SELECTION_SINGLE) {
            esm_select_single_row (selection, selection->cursor_row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], selection->cursor_row, selection->cursor_col);
            return TRUE;
        }
        break;
    case GDK_Home:
    case GDK_KP_Home:
        if (selection->cursor_mode == E_CURSOR_LINE) {
            int row = 0;

            row = e_sorter_sorted_to_model(selection->sorter, row);
            selection->cursor_row = row;

            esm_select_single_row (selection, selection->cursor_row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], selection->cursor_row, selection->cursor_col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], selection->cursor_row, selection->cursor_col);
            return TRUE;
        }
        break;
    case GDK_End:
    case GDK_KP_End:
        if (selection->cursor_mode == E_CURSOR_LINE) {
            int row = selection->row_count - 1;

            row = e_sorter_sorted_to_model(selection->sorter, row);
            selection->cursor_row = row;

            esm_select_single_row (selection, selection->cursor_row);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_CHANGED], selection->cursor_row, selection->cursor_col);
            gtk_signal_emit(GTK_OBJECT(selection),
                    e_selection_model_signals[CURSOR_ACTIVATED], selection->cursor_row, selection->cursor_col);
            return TRUE;
        }
        break;
    }
    return FALSE;
}

/** 
 * e_selection_model_clear
 * @selection: #ESelectionModel to clear
 *
 * This routine clears the selection to no rows selected.
 */
void
e_selection_model_clear(ESelectionModel *selection)
{
    g_free(selection->selection);
    selection->selection = NULL;
    selection->row_count = -1;
    selection->cursor_row = -1;
    selection->cursor_col = -1;
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals [CURSOR_CHANGED], -1, -1);
    gtk_signal_emit(GTK_OBJECT(selection),
            e_selection_model_signals [SELECTION_CHANGED]);
}

#define PART(x,n) (((x) & (0x01010101 << n)) >> n)
#define SECTION(x, n) (((x) >> (n * 8)) & 0xff)

/** 
 * e_selection_model_selected_count
 * @selection: #ESelectionModel to count
 *
 * This routine calculates the number of rows selected.
 *
 * Returns: The number of rows selected in the given model.
 */
gint
e_selection_model_selected_count (ESelectionModel *selection)
{
    gint count;
    int i;
    int last;

    if (!selection->selection)
        return 0;

    count = 0;

    last = BOX(selection->row_count - 1);

    for (i = 0; i <= last; i++) {
        int j;
        guint32 thiscount = 0;
        for (j = 0; j < 8; j++)
            thiscount += PART(selection->selection[i], j);
        for (j = 0; j < 4; j++)
            count += SECTION(thiscount, j);
    }

    return count;
}

/** 
 * e_selection_model_select_all
 * @selection: #ESelectionModel to select all
 *
 * This routine selects all the rows in the given
 * #ESelectionModel.
 */
void
e_selection_model_select_all (ESelectionModel *selection)
{
    int i;
    
    if (selection->row_count < 0) {
        selection->row_count = e_selection_model_get_row_count(selection);
        if (selection->row_count < 0)
            return;
        g_free (selection->selection);
        selection->selection = g_new0 (gint, (selection->row_count + 31) / 32);
    }
    
    if (!selection->selection)
        selection->selection = g_new0 (gint, (selection->row_count + 31) / 32);
    
    for (i = 0; i < (selection->row_count + 31) / 32; i ++) {
        selection->selection[i] = ONES;
    }

    /* need to zero out the bits corresponding to the rows not
       selected in the last full 32 bit mask */
    if (selection->row_count % 32) {
        int unselected_mask = 0;
        int num_unselected_in_last_byte = 32 - selection->row_count % 32;

        for (i = 0; i < num_unselected_in_last_byte; i ++)
            unselected_mask |= 1 << i;

        selection->selection[(selection->row_count + 31) / 32 - 1] &= ~unselected_mask;
    }

    selection->cursor_col = 0;
    selection->cursor_row = 0;
    selection->selection_start_row = 0;
    gtk_signal_emit (GTK_OBJECT (selection),
             e_selection_model_signals [CURSOR_CHANGED], 0, 0);
    gtk_signal_emit (GTK_OBJECT (selection),
             e_selection_model_signals [SELECTION_CHANGED]);
}

/** 
 * e_selection_model_invert_selection
 * @selection: #ESelectionModel to invert
 *
 * This routine inverts all the rows in the given
 * #ESelectionModel.
 */
void
e_selection_model_invert_selection (ESelectionModel *selection)
{
    int i;
    
    if (selection->row_count < 0) {
        selection->row_count = e_selection_model_get_row_count (selection);
        if (selection->row_count < 0)
            return;
        g_free (selection->selection);
        selection->selection = g_new0 (gint, (selection->row_count + 31) / 32);
    }
    
    if (!selection->selection)
        selection->selection = g_new0 (gint, (selection->row_count + 31) / 32);
    
    for (i = 0; i < (selection->row_count + 31) / 32; i ++) {
        selection->selection[i] = ~selection->selection[i];
    }
    
    selection->cursor_col = -1;
    selection->cursor_row = -1;
    selection->selection_start_row = 0;
    gtk_signal_emit (GTK_OBJECT (selection),
             e_selection_model_signals [CURSOR_CHANGED], -1, -1);
    gtk_signal_emit (GTK_OBJECT (selection),
             e_selection_model_signals [SELECTION_CHANGED]);
}

int
e_selection_model_get_row_count (ESelectionModel *selection)
{
    g_return_val_if_fail(selection != NULL, 0);
    g_return_val_if_fail(E_IS_SELECTION_MODEL(selection), 0);

    if (ESM_CLASS(selection)->get_row_count)
        return ESM_CLASS(selection)->get_row_count (selection);
    else
        return 0;
}