aboutsummaryrefslogtreecommitdiffstats
path: root/lib/widgets/ephy-spinner.c
blob: 8145e17aebf09e197888b9c4f018443ea25a98a5 (plain) (blame)
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
/* 
 * Nautilus
 *
 * Copyright (C) 2000 Eazel, Inc.
 * Copyright (C) 2002-2004 Marco Pesenti Gritti
 * Copyright (C) 2004 Christian Persch
 *
 * Nautilus 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 of the License, or
 * (at your option) any later version.
 *
 * Nautilus 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Andy Hertzfeld <andy@eazel.com>
 *
 * Ephy port by Marco Pesenti Gritti <marco@it.gnome.org>
 * 
 * This is the spinner (for busy feedback) for the location bar
 *
 * $Id$
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "ephy-spinner.h"

#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gtk/gtkicontheme.h>
#include <gtk/gtkiconfactory.h>

#define spinner_DEFAULT_TIMEOUT 100 /* Milliseconds Per Frame */

#define EPHY_SPINNER_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_SPINNER, EphySpinnerDetails))

struct EphySpinnerDetails
{
    GList   *image_list;
    GdkPixbuf *quiescent_pixbuf;
    GtkIconTheme *icon_theme;
    GtkIconSize size;

    int max_frame;
    int delay;
    int current_frame;
    guint   timer_task;
};

static void ephy_spinner_class_init     (EphySpinnerClass *class);
static void ephy_spinner_init           (EphySpinner *spinner);
static void ephy_spinner_load_images        (EphySpinner *spinner);
static void ephy_spinner_unload_images      (EphySpinner *spinner);
static void ephy_spinner_remove_update_callback (EphySpinner *spinner);
static void ephy_spinner_theme_changed      (GtkIconTheme *icon_theme,
                         EphySpinner *spinner);

static GObjectClass *parent_class = NULL;

GType
ephy_spinner_get_type (void)
{
    static GType type = 0;

    if (type == 0)
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphySpinnerClass),
            NULL, /* base_init */
            NULL, /* base_finalize */
            (GClassInitFunc) ephy_spinner_class_init,
            NULL,
            NULL, /* class_data */
            sizeof (EphySpinner),
            0, /* n_preallocs */
            (GInstanceInitFunc) ephy_spinner_init
        };

        type = g_type_register_static (GTK_TYPE_EVENT_BOX,
                           "EphySpinner",
                           &our_info, 0);
    }

    return type;
}

static gboolean
is_throbbing (EphySpinner *spinner)
{
    return spinner->details->timer_task != 0;
}

/* loop through all the images taking their union to compute the width and height of the spinner */
static void
get_spinner_dimensions (EphySpinner *spinner, int *spinner_width, int* spinner_height)
{
    int current_width, current_height;
    int pixbuf_width, pixbuf_height;
    GList *image_list;
    GdkPixbuf *pixbuf;

    if (spinner->details->image_list == NULL)
    {
        ephy_spinner_load_images (spinner);
    }

    current_width = 0;
    current_height = 0;

    if (spinner->details->quiescent_pixbuf != NULL)
    {
        /* start with the quiescent image */
        current_width = gdk_pixbuf_get_width (spinner->details->quiescent_pixbuf);
        current_height = gdk_pixbuf_get_height (spinner->details->quiescent_pixbuf);
    }

    /* loop through all the installed images, taking the union */
    image_list = spinner->details->image_list;
    while (image_list != NULL)
    {
        pixbuf = GDK_PIXBUF (image_list->data);
        pixbuf_width = gdk_pixbuf_get_width (pixbuf);
        pixbuf_height = gdk_pixbuf_get_height (pixbuf);

        if (pixbuf_width > current_width)
        {
            current_width = pixbuf_width;
        }

        if (pixbuf_height > current_height)
        {
            current_height = pixbuf_height;
        }

        image_list = image_list->next;
    }

    /* return the result */
    *spinner_width = current_width;
    *spinner_height = current_height;
}

static void
ephy_spinner_init (EphySpinner *spinner)
{
    GtkWidget *widget = GTK_WIDGET (spinner);

    gtk_widget_set_events (widget,
                   gtk_widget_get_events (widget)
                   | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK
                   | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK);

    spinner->details = EPHY_SPINNER_GET_PRIVATE (spinner);

    spinner->details->delay = spinner_DEFAULT_TIMEOUT;
    /* FIXME: icon theme is per-screen, not global */
    spinner->details->icon_theme = gtk_icon_theme_get_default ();
    g_signal_connect_object (spinner->details->icon_theme,
                 "changed",
                 G_CALLBACK (ephy_spinner_theme_changed),
                 spinner, 0);

    spinner->details->quiescent_pixbuf = NULL;
    spinner->details->image_list = NULL;
    spinner->details->max_frame = 0;
    spinner->details->current_frame = 0;
    spinner->details->timer_task = 0;
    spinner->details->size = GTK_ICON_SIZE_INVALID;
}

/* handler for handling theme changes */
static void
ephy_spinner_theme_changed (GtkIconTheme *icon_theme, EphySpinner *spinner)
{
    gtk_widget_hide (GTK_WIDGET (spinner));
    ephy_spinner_load_images (spinner);
    gtk_widget_show (GTK_WIDGET (spinner));
    gtk_widget_queue_resize ( GTK_WIDGET (spinner));
}

/* here's the routine that selects the image to draw, based on the spinner's state */

static GdkPixbuf *
select_spinner_image (EphySpinner *spinner)
{
    GList *element;

    if (spinner->details->timer_task == 0)
    {
        if (spinner->details->quiescent_pixbuf)
        {
            return g_object_ref (spinner->details->quiescent_pixbuf);
        }
        else
        {
            return NULL;
        }
    }

    if (spinner->details->image_list == NULL)
    {
        return NULL;
    }

    element = g_list_nth (spinner->details->image_list, spinner->details->current_frame);
    g_return_val_if_fail (element != NULL, NULL);

    return g_object_ref (element->data);
}

/* handle expose events */

static int
ephy_spinner_expose (GtkWidget *widget, GdkEventExpose *event)
{
    EphySpinner *spinner = EPHY_SPINNER (widget);
    GdkPixbuf *pixbuf;
    GdkGC *gc;
    int x_offset, y_offset, width, height;
    GdkRectangle pix_area, dest;

    if (!GTK_WIDGET_DRAWABLE (spinner)) return TRUE;

    if (spinner->details->image_list == NULL)
    {
        ephy_spinner_load_images (spinner);
    }

    pixbuf = select_spinner_image (spinner);
    if (pixbuf == NULL)
    {
        return FALSE;
    }

    width = gdk_pixbuf_get_width (pixbuf);
    height = gdk_pixbuf_get_height (pixbuf);

    /* Compute the offsets for the image centered on our allocation */
    x_offset = (widget->allocation.width - width) / 2;
    y_offset = (widget->allocation.height - height) / 2;

    pix_area.x = x_offset + widget->allocation.x;
    pix_area.y = y_offset + widget->allocation.y;
    pix_area.width = width;
    pix_area.height = height;

    if (!gdk_rectangle_intersect (&event->area, &pix_area, &dest))
    {
        g_object_unref (pixbuf);
        return FALSE;
    }

    gc = gdk_gc_new (widget->window);
    gdk_draw_pixbuf (widget->window, gc, pixbuf,
             dest.x - x_offset - widget->allocation.x,
             dest.y - y_offset - widget->allocation.y,
             dest.x, dest.y,
             dest.width, dest.height,
             GDK_RGB_DITHER_MAX, 0, 0);
    g_object_unref (gc);

    g_object_unref (pixbuf);

    return FALSE;
}

/* here's the actual timeout task to bump the frame and schedule a redraw */

static gboolean
bump_spinner_frame (gpointer callback_data)
{
    EphySpinner *spinner;

    spinner = EPHY_SPINNER (callback_data);

    if (!GTK_WIDGET_DRAWABLE (spinner))
    {
        return TRUE;
    }

    spinner->details->current_frame += 1;
    if (spinner->details->current_frame > spinner->details->max_frame - 1)
    {
        spinner->details->current_frame = 0;
    }

    gtk_widget_queue_draw (GTK_WIDGET (spinner));
    return TRUE;
}

/**
 * ephy_spinner_start:
 * @spinner: a #EphySpinner
 *
 * Start the spinner animation.
 **/
void
ephy_spinner_start (EphySpinner *spinner)
{
    if (is_throbbing (spinner))
    {
        return;
    }

    if (spinner->details->timer_task != 0)
    {
        g_source_remove (spinner->details->timer_task);
    }

    /* reset the frame count */
    spinner->details->current_frame = 0;
    spinner->details->timer_task = g_timeout_add (spinner->details->delay,
                              bump_spinner_frame,
                              spinner);
}

static void
ephy_spinner_remove_update_callback (EphySpinner *spinner)
{
    if (spinner->details->timer_task != 0)
    {
        g_source_remove (spinner->details->timer_task);
    }

    spinner->details->timer_task = 0;
}

/**
 * ephy_spinner_stop:
 * @spinner: a #EphySpinner
 *
 * Stop the spinner animation.
 **/
void
ephy_spinner_stop (EphySpinner *spinner)
{
    if (!is_throbbing (spinner))
    {
        return;
    }

    ephy_spinner_remove_update_callback (spinner);
    gtk_widget_queue_draw (GTK_WIDGET (spinner));

}

/* routines to load the images used to draw the spinner */

/* unload all the images, and the list itself */

static void
ephy_spinner_unload_images (EphySpinner *spinner)
{
    if (spinner->details->quiescent_pixbuf != NULL)
    {
        g_object_unref (spinner->details->quiescent_pixbuf);
        spinner->details->quiescent_pixbuf = NULL;
    }

    /* unref all the images in the list, and then let go of the list itself */
    g_list_foreach (spinner->details->image_list, (GFunc) g_object_unref, NULL);
    g_list_free (spinner->details->image_list);
    spinner->details->image_list = NULL;

    spinner->details->current_frame = 0;
}

static GdkPixbuf *
scale_to_real_size (EphySpinner *spinner, GdkPixbuf *pixbuf)
{
    GdkPixbuf *result;
    int sw, sh, pw, ph;

    if (spinner->details->size == GTK_ICON_SIZE_INVALID)
    {
        return g_object_ref (pixbuf);
    }

    if (!gtk_icon_size_lookup (spinner->details->size, &sw, &sh))
    {
        return NULL;
    }

    pw = gdk_pixbuf_get_width (pixbuf);
    ph = gdk_pixbuf_get_height (pixbuf);

    if (pw != sw || ph != sh)
    {
        result = gdk_pixbuf_scale_simple (pixbuf, sw, sh,
                          GDK_INTERP_BILINEAR);
    }
    else
    {
        result = g_object_ref (pixbuf);
    }

    return result;
}

static GdkPixbuf *
extract_frame (EphySpinner *spinner, GdkPixbuf *grid_pixbuf, int x, int y, int size)
{
    GdkPixbuf *pixbuf, *result;

    if (x + size > gdk_pixbuf_get_width (grid_pixbuf) ||
        y + size > gdk_pixbuf_get_height (grid_pixbuf))
    {
        return NULL;
    }

    pixbuf = gdk_pixbuf_new_subpixbuf (grid_pixbuf,
                       x, y,
                       size, size);
    g_return_val_if_fail (pixbuf != NULL, NULL);

    result = scale_to_real_size (spinner, pixbuf);
    g_object_unref (pixbuf);

    return result;
}

/* load all of the images of the spinner sequentially */
static void
ephy_spinner_load_images (EphySpinner *spinner)
{
    int grid_width, grid_height, x, y, size;
    const char *icon;
    GdkPixbuf *icon_pixbuf, *pixbuf;
    GList *image_list;
    GtkIconInfo *icon_info;

    ephy_spinner_unload_images (spinner);

    /* Load the animation */
    icon_info = gtk_icon_theme_lookup_icon (spinner->details->icon_theme,
                        "gnome-spinner", -1, 0);
    if (icon_info == NULL)
    {
        g_warning ("Throbber animation not found");
        return;
    }

    size = gtk_icon_info_get_base_size (icon_info);
    icon = gtk_icon_info_get_filename (icon_info);
    g_return_if_fail (icon != NULL);

    icon_pixbuf = gdk_pixbuf_new_from_file (icon, NULL);
    grid_width = gdk_pixbuf_get_width (icon_pixbuf);
    grid_height = gdk_pixbuf_get_height (icon_pixbuf);

    image_list = NULL;
    for (y = 0; y < grid_height; y += size)
    {
        for (x = 0; x < grid_width ; x += size)
        {
            pixbuf = extract_frame (spinner, icon_pixbuf, x, y, size);

            if (pixbuf)
            {
                image_list = g_list_prepend (image_list, pixbuf);
            }
            else
            {
                g_warning ("Cannot extract frame from the grid");
            }
        }
    }
    spinner->details->image_list = g_list_reverse (image_list);
    spinner->details->max_frame = g_list_length (spinner->details->image_list);

    gtk_icon_info_free (icon_info);
    g_object_unref (icon_pixbuf);

    /* Load the rest icon */
    icon_info = gtk_icon_theme_lookup_icon (spinner->details->icon_theme,
                        "gnome-spinner-rest", -1, 0);
    if (icon_info == NULL)
    {
        g_warning ("Throbber rest icon not found");
        return;
    }

    size = gtk_icon_info_get_base_size (icon_info);
    icon = gtk_icon_info_get_filename (icon_info);
    g_return_if_fail (icon != NULL);

    icon_pixbuf = gdk_pixbuf_new_from_file (icon, NULL);
    spinner->details->quiescent_pixbuf = scale_to_real_size (spinner, icon_pixbuf);

    g_object_unref (icon_pixbuf);
    gtk_icon_info_free (icon_info);
}

/*
 * ephy_spinner_set_size:
 * @spinner: a #EphySpinner
 * @size: the size of type %GtkIconSize
 *
 * Set the size of the spinner. Use %GTK_ICON_SIZE_INVALID to use the
 * native size of the icon.
 **/
void
ephy_spinner_set_size (EphySpinner *spinner, GtkIconSize size)
{
    if (size != spinner->details->size)
    {
        ephy_spinner_unload_images (spinner);

        spinner->details->size = size;

        gtk_widget_queue_resize (GTK_WIDGET (spinner));
    }
}

/* handle setting the size */

static void
ephy_spinner_size_request (GtkWidget *widget, GtkRequisition *requisition)
{
    EphySpinner *spinner = EPHY_SPINNER (widget);
    int width = 0, height = 0;

    if (spinner->details->size == GTK_ICON_SIZE_INVALID)
    {
        get_spinner_dimensions (spinner, &width, &height);
    }
    else
    {
        gtk_icon_size_lookup (spinner->details->size, &width, &height);
    }

    requisition->width = width;
    requisition->height = height;

    /* allocate some extra margin so we don't butt up against toolbar edges */
    if (spinner->details->size != GTK_ICON_SIZE_MENU)
    {
        requisition->width += 4;
        requisition->height += 4;
    }
}

static void
ephy_spinner_finalize (GObject *object)
{
    EphySpinner *spinner = EPHY_SPINNER (object);

    ephy_spinner_remove_update_callback (spinner);
    ephy_spinner_unload_images (spinner);

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
ephy_spinner_class_init (EphySpinnerClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = G_OBJECT_CLASS (class);
    widget_class = GTK_WIDGET_CLASS (class);

    parent_class = g_type_class_peek_parent (class);

    object_class->finalize = ephy_spinner_finalize;

    widget_class->expose_event = ephy_spinner_expose;
    widget_class->size_request = ephy_spinner_size_request;

    g_type_class_add_private (object_class, sizeof (EphySpinnerDetails));
}

/*
 * ephy_spinner_new:
 *
 * Create a new #EphySpinner. The spinner is a widget
 * that gives the user feedback about network status with
 * an animated image.
 *
 * Return Value: the spinner #GtkWidget
 **/
GtkWidget *
ephy_spinner_new (void)
{
    return GTK_WIDGET (g_object_new (EPHY_TYPE_SPINNER,
                     "visible-window", FALSE,
                     NULL));
}