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ephy-spinner.c

/* 
 * Copyright © 2000 Eazel, Inc.
 * Copyright © 2002-2004 Marco Pesenti Gritti
 * Copyright © 2004, 2006 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>
 * 
 * $Id$
 */

#include "config.h"

#include "ephy-spinner.h"

/* #include "ephy-debug.h" */
#define LOG(msg, args...)
#define START_PROFILER(name)
#define STOP_PROFILER(name)

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

/* Spinner cache implementation */

#define EPHY_TYPE_SPINNER_CACHE                 (ephy_spinner_cache_get_type())
#define EPHY_SPINNER_CACHE(object)        (G_TYPE_CHECK_INSTANCE_CAST((object), EPHY_TYPE_SPINNER_CACHE, EphySpinnerCache))
#define EPHY_SPINNER_CACHE_CLASS(klass)   (G_TYPE_CHECK_CLASS_CAST((klass), EPHY_TYPE_SPINNER_CACHE, EphySpinnerCacheClass))
#define EPHY_IS_SPINNER_CACHE(object)           (G_TYPE_CHECK_INSTANCE_TYPE((object), EPHY_TYPE_SPINNER_CACHE))
#define EPHY_IS_SPINNER_CACHE_CLASS(klass)      (G_TYPE_CHECK_CLASS_TYPE((klass), EPHY_TYPE_SPINNER_CACHE))
#define EPHY_SPINNER_CACHE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), EPHY_TYPE_SPINNER_CACHE, EphySpinnerCacheClass))

typedef struct _EphySpinnerCache    EphySpinnerCache;
typedef struct _EphySpinnerCacheClass     EphySpinnerCacheClass;
typedef struct _EphySpinnerCachePrivate   EphySpinnerCachePrivate;

struct _EphySpinnerCacheClass
{
      GObjectClass parent_class;
};

struct _EphySpinnerCache
{
      GObject parent_object;

      /*< private >*/
      EphySpinnerCachePrivate *priv;
};

#define EPHY_SPINNER_CACHE_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_SPINNER_CACHE, EphySpinnerCachePrivate))

struct _EphySpinnerCachePrivate
{
      /* Hash table of GdkScreen -> EphySpinnerCacheData */
      GHashTable *hash;
};

typedef struct
{
      guint ref_count;
      GtkIconSize size;
      int width;
      int height;
      GdkPixbuf **animation_pixbufs;
      guint n_animation_pixbufs;
} EphySpinnerImages;

#define LAST_ICON_SIZE              GTK_ICON_SIZE_DIALOG + 1
#define SPINNER_ICON_NAME           "process-working"
#define SPINNER_FALLBACK_ICON_NAME  "gnome-spinner"
#define EPHY_SPINNER_IMAGES_INVALID ((EphySpinnerImages *) 0x1)

typedef struct
{
      GdkScreen *screen;
      GtkIconTheme *icon_theme;
      EphySpinnerImages *images[LAST_ICON_SIZE];
} EphySpinnerCacheData;

static void ephy_spinner_cache_class_init (EphySpinnerCacheClass *klass);
static void ephy_spinner_cache_init   (EphySpinnerCache *cache);

static GObjectClass *ephy_spinner_cache_parent_class;

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

      if (G_UNLIKELY (type == 0))
      {
            const GTypeInfo our_info =
            {
                  sizeof (EphySpinnerCacheClass),
                  NULL,
                  NULL,
                  (GClassInitFunc) ephy_spinner_cache_class_init,
                  NULL,
                  NULL,
                  sizeof (EphySpinnerCache),
                  0,
                  (GInstanceInitFunc) ephy_spinner_cache_init
            };

            type = g_type_register_static (G_TYPE_OBJECT,
                                     "EphySpinnerCache",
                                     &our_info, 0);
      }

      return type;
}

static EphySpinnerImages *
ephy_spinner_images_ref (EphySpinnerImages *images)
{
      g_return_val_if_fail (images != NULL, NULL);

      images->ref_count++;

      return images;
}

static void
ephy_spinner_images_unref (EphySpinnerImages *images)
{
      g_return_if_fail (images != NULL);

      images->ref_count--;
      if (images->ref_count == 0)
      {
            guint i;

            LOG ("Freeing spinner images %p for size %d", images, images->size);

            for (i = 0; i < images->n_animation_pixbufs; ++i)
            {
                  g_object_unref (images->animation_pixbufs[i]);
            }
            g_free (images->animation_pixbufs);

            g_free (images);
      }
}

static void
ephy_spinner_cache_data_unload (EphySpinnerCacheData *data)
{
      GtkIconSize size;
      EphySpinnerImages *images;

      g_return_if_fail (data != NULL);

      LOG ("EphySpinnerDataCache unload for screen %p", data->screen);

      for (size = GTK_ICON_SIZE_INVALID; size < LAST_ICON_SIZE; ++size)
      {
            images = data->images[size];
            data->images[size] = NULL;

            if (images != NULL && images != EPHY_SPINNER_IMAGES_INVALID)
            {
                  ephy_spinner_images_unref (images);
            }
      }
}

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

      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);

      return pixbuf;
}

static GdkPixbuf *
scale_to_size (GdkPixbuf *pixbuf,
             int dw,
             int dh)
{
      GdkPixbuf *result;
      int pw, ph;

      g_return_val_if_fail (pixbuf != NULL, NULL);

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

      if (pw != dw || ph != dh)
      {
            result = gdk_pixbuf_scale_simple (pixbuf, dw, dh,
                                      GDK_INTERP_BILINEAR);
            g_object_unref (pixbuf);
            return result;
      }

      return pixbuf;
}

static EphySpinnerImages *
ephy_spinner_images_load (GdkScreen *screen,
                    GtkIconTheme *icon_theme,
                    GtkIconSize icon_size)
{
      EphySpinnerImages *images;
      GdkPixbuf *icon_pixbuf, *pixbuf;
      GtkIconInfo *icon_info = NULL;
      int grid_width, grid_height, x, y, requested_size, size, isw, ish, n;
      const char *icon;
      GSList *list = NULL, *l;

      LOG ("EphySpinnerCacheData loading for screen %p at size %d", screen, icon_size);

      START_PROFILER ("loading spinner animation")

      if (!gtk_icon_size_lookup_for_settings (gtk_settings_get_for_screen (screen),
                                    icon_size, &isw, &ish)) goto loser;

      requested_size = MAX (ish, isw);

      /* Load the animation. The 'rest icon' is the 0th frame */
      icon_info = gtk_icon_theme_lookup_icon (icon_theme,
                                    SPINNER_ICON_NAME,
                                      requested_size, 0);
      if (icon_info == NULL)
      {
            g_warning ("Throbber animation not found");
      
            /* If the icon naming spec compliant name wasn't found, try the old name */
            icon_info = gtk_icon_theme_lookup_icon (icon_theme,
                                          SPINNER_FALLBACK_ICON_NAME,
                                          requested_size, 0);
            if (icon_info == NULL)
            {
                  g_warning ("Throbber fallback animation not found either");
                  goto loser;
            }
      }
      g_assert (icon_info != NULL);

      size = gtk_icon_info_get_base_size (icon_info);
      icon = gtk_icon_info_get_filename (icon_info);
      if (icon == NULL) goto loser;

      icon_pixbuf = gdk_pixbuf_new_from_file (icon, NULL);
      gtk_icon_info_free (icon_info);
      icon_info = NULL;

      if (icon_pixbuf == NULL)
      {
            g_warning ("Could not load the spinner file");
            goto loser;
      }

      grid_width = gdk_pixbuf_get_width (icon_pixbuf);
      grid_height = gdk_pixbuf_get_height (icon_pixbuf);

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

                  if (pixbuf)
                  {
                        list = g_slist_prepend (list, pixbuf);
                        ++n;
                  }
                  else
                  {
                        g_warning ("Cannot extract frame (%d, %d) from the grid\n", x, y);
                  }
            }
      }

      g_object_unref (icon_pixbuf);

      if (list == NULL) goto loser;
      g_assert (n > 0);

      if (size > requested_size)
      {
            for (l = list; l != NULL; l = l->next)
            {
                  l->data = scale_to_size (l->data, isw, ish);
            }
      }

      /* Now we've successfully got all the data */
      images = g_new (EphySpinnerImages, 1);
      images->ref_count = 1;

      images->size = icon_size;
      images->width = images->height = requested_size;

      images->n_animation_pixbufs = n;
      images->animation_pixbufs = g_new (GdkPixbuf *, n);

      for (l = list; l != NULL; l = l->next)
      {
            g_assert (l->data != NULL);
            images->animation_pixbufs[--n] = l->data;
      }
      g_assert (n == 0);

      g_slist_free (list);

      STOP_PROFILER ("loading spinner animation")

      return images;

loser:
      if (icon_info)
      {
            gtk_icon_info_free (icon_info);
      }
      g_slist_foreach (list, (GFunc) g_object_unref, NULL);

      STOP_PROFILER ("loading spinner animation")

      return NULL;
}

static EphySpinnerCacheData *
ephy_spinner_cache_data_new (GdkScreen *screen)
{
      EphySpinnerCacheData *data;

      data = g_new0 (EphySpinnerCacheData, 1);

      data->screen = screen;
      data->icon_theme = gtk_icon_theme_get_for_screen (screen);
      g_signal_connect_swapped (data->icon_theme, "changed",
                          G_CALLBACK (ephy_spinner_cache_data_unload),
                          data);

      return data;
}

static void
ephy_spinner_cache_data_free (EphySpinnerCacheData *data)
{
      g_return_if_fail (data != NULL);
      g_return_if_fail (data->icon_theme != NULL);

      g_signal_handlers_disconnect_by_func
            (data->icon_theme,
             G_CALLBACK (ephy_spinner_cache_data_unload), data);

      ephy_spinner_cache_data_unload (data);

      g_free (data);
}

static EphySpinnerImages *
ephy_spinner_cache_get_images (EphySpinnerCache *cache,
                         GdkScreen *screen,
                         GtkIconSize icon_size)
{
      EphySpinnerCachePrivate *priv = cache->priv;
      EphySpinnerCacheData *data;
      EphySpinnerImages *images;

      LOG ("Getting animation images for screen %p at size %d", screen, icon_size);

      g_return_val_if_fail (icon_size >= 0 && icon_size < LAST_ICON_SIZE, NULL);

      /* Backward compat: "invalid" meant "native" size which doesn't exist anymore */
      if (icon_size == GTK_ICON_SIZE_INVALID)
      {
            icon_size = GTK_ICON_SIZE_DIALOG;
      }

      data = g_hash_table_lookup (priv->hash, screen);
      if (data == NULL)
      {
            data = ephy_spinner_cache_data_new (screen);
            /* FIXME: think about what happens when the screen's display is closed later on */
            g_hash_table_insert (priv->hash, screen, data);
      }

      images = data->images[icon_size];
      if (images == EPHY_SPINNER_IMAGES_INVALID)
      {
            /* Load failed, but don't try endlessly again! */
            return NULL;
      }

      if (images != NULL)
      {
            /* Return cached data */
            return ephy_spinner_images_ref (images);
      }

      images = ephy_spinner_images_load (screen, data->icon_theme, icon_size);

      if (images == NULL)
      {
            /* Mark as failed-to-load */
            data->images[icon_size] = EPHY_SPINNER_IMAGES_INVALID;

            return NULL;
      }

      data->images[icon_size] = images;

      return ephy_spinner_images_ref (images);
}

static void
ephy_spinner_cache_init (EphySpinnerCache *cache)
{
      EphySpinnerCachePrivate *priv;

      priv = cache->priv = EPHY_SPINNER_CACHE_GET_PRIVATE (cache);

      LOG ("EphySpinnerCache initialising");

      priv->hash = g_hash_table_new_full (g_direct_hash, g_direct_equal,
                                  NULL,
                                  (GDestroyNotify) ephy_spinner_cache_data_free);
}

static void
ephy_spinner_cache_finalize (GObject *object)
{
      EphySpinnerCache *cache = EPHY_SPINNER_CACHE (object); 
      EphySpinnerCachePrivate *priv = cache->priv;

      g_hash_table_destroy (priv->hash);

      LOG ("EphySpinnerCache finalised");

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

static void
ephy_spinner_cache_class_init (EphySpinnerCacheClass *klass)
{
      GObjectClass *object_class = G_OBJECT_CLASS (klass);

      ephy_spinner_cache_parent_class = g_type_class_peek_parent (klass);

      object_class->finalize = ephy_spinner_cache_finalize;

      g_type_class_add_private (object_class, sizeof (EphySpinnerCachePrivate));
}

static EphySpinnerCache *spinner_cache = NULL;

static EphySpinnerCache *
ephy_spinner_cache_ref (void)
{
      if (spinner_cache == NULL)
      {
            EphySpinnerCache **cache_ptr;

            spinner_cache = g_object_new (EPHY_TYPE_SPINNER_CACHE, NULL);
            cache_ptr = &spinner_cache;
            g_object_add_weak_pointer (G_OBJECT (spinner_cache),
                                 (gpointer *) cache_ptr);

            return spinner_cache;
      }
            
      return g_object_ref (spinner_cache);
}

/* Spinner implementation */

#define SPINNER_TIMEOUT 125 /* ms */

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

struct _EphySpinnerDetails
{
      GtkIconTheme *icon_theme;
      EphySpinnerCache *cache;
      GtkIconSize size;
      EphySpinnerImages *images;
      guint current_image;
      guint timeout;
      guint timer_task;
      guint spinning : 1;
      guint need_load : 1;
};

static void ephy_spinner_class_init (EphySpinnerClass *class);
static void ephy_spinner_init     (EphySpinner *spinner);

static GObjectClass *parent_class;

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

      if (G_UNLIKELY (type == 0))
      {
            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_WIDGET,
                                     "EphySpinner",
                                     &our_info, 0);
      }

      return type;
}

static gboolean
ephy_spinner_load_images (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

      if (details->need_load)
      {
            START_PROFILER ("ephy_spinner_load_images")

            details->images =
                  ephy_spinner_cache_get_images
                        (details->cache,
                         gtk_widget_get_screen (GTK_WIDGET (spinner)),
                         details->size);

            STOP_PROFILER ("ephy_spinner_load_images")

            details->current_image = 0; /* 'rest' icon */
            details->need_load = FALSE;
      }

      return details->images != NULL;
}

static void
ephy_spinner_unload_images (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

      if (details->images != NULL)
      {
            ephy_spinner_images_unref (details->images);
            details->images = NULL;
      }

      details->current_image = 0;
      details->need_load = TRUE;
}

static void
icon_theme_changed_cb (GtkIconTheme *icon_theme,
                   EphySpinner *spinner)
{
      ephy_spinner_unload_images (spinner);
      gtk_widget_queue_resize (GTK_WIDGET (spinner));
}

static void
ephy_spinner_init (EphySpinner *spinner)
{
      EphySpinnerDetails *details;

      details = spinner->details = EPHY_SPINNER_GET_PRIVATE (spinner);

      GTK_WIDGET_SET_FLAGS (GTK_WIDGET (spinner), GTK_NO_WINDOW);

      details->cache = ephy_spinner_cache_ref ();
      details->size = GTK_ICON_SIZE_DIALOG;
      details->spinning = FALSE;
      details->timeout = SPINNER_TIMEOUT;
      details->need_load = TRUE;
}

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

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

      if (details->need_load &&
          !ephy_spinner_load_images (spinner))
      {
            return FALSE;
      }

      images = details->images;
      if (images == NULL)
      {
            return FALSE;
      }

      /* Otherwise |images| will be NULL anyway */
      g_assert (images->n_animation_pixbufs > 0);
            
      g_assert (details->current_image >= 0 &&
              details->current_image < images->n_animation_pixbufs);

      pixbuf = images->animation_pixbufs[details->current_image];

      g_assert (pixbuf != NULL);

      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))
      {
            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);

      return FALSE;
}

static gboolean
bump_spinner_frame_cb (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

      /* This can happen when we've unloaded the images on a theme
       * change, but haven't been in the queued size request yet.
       * Just skip this update.
       */
      if (details->images == NULL) return TRUE;

      details->current_image++;
      if (details->current_image >= details->images->n_animation_pixbufs)
      {
            /* the 0th frame is the 'rest' icon */
            details->current_image = MIN (1, details->images->n_animation_pixbufs);
      }

      gtk_widget_queue_draw (GTK_WIDGET (spinner));

      /* run again */
      return TRUE;
}

/**
 * ephy_spinner_start:
 * @spinner: a #EphySpinner
 *
 * Start the spinner animation.
 **/
void
ephy_spinner_start (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

      details->spinning = TRUE;

      if (GTK_WIDGET_MAPPED (GTK_WIDGET (spinner)) &&
          details->timer_task == 0 &&
          ephy_spinner_load_images (spinner))
      {
            /* the 0th frame is the 'rest' icon */
            details->current_image = MIN (1, details->images->n_animation_pixbufs);

            details->timer_task =
                  g_timeout_add_full (G_PRIORITY_LOW,
                                      details->timeout,
                                    (GSourceFunc) bump_spinner_frame_cb,
                                    spinner,
                                    NULL);
      }
}

static void
ephy_spinner_remove_update_callback (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

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

/**
 * ephy_spinner_stop:
 * @spinner: a #EphySpinner
 *
 * Stop the spinner animation.
 **/
void
ephy_spinner_stop (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;

      details->spinning = FALSE;
      details->current_image = 0;

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

            if (GTK_WIDGET_MAPPED (GTK_WIDGET (spinner)))
            {
                  gtk_widget_queue_draw (GTK_WIDGET (spinner));
            }
      }
}

/*
 * ephy_spinner_set_size:
 * @spinner: a #EphySpinner
 * @size: the size of type %GtkIconSize
 *
 * Set the size of the spinner.
 **/
void
ephy_spinner_set_size (EphySpinner *spinner,
                   GtkIconSize size)
{
      if (size == GTK_ICON_SIZE_INVALID)
      {
            size = GTK_ICON_SIZE_DIALOG;
      }

      if (size != spinner->details->size)
      {
            ephy_spinner_unload_images (spinner);

            spinner->details->size = size;

            gtk_widget_queue_resize (GTK_WIDGET (spinner));
      }
}

#if 0
/*
 * ephy_spinner_set_timeout:
 * @spinner: a #EphySpinner
 * @timeout: time delay between updates to the spinner.
 *
 * Sets the timeout delay for spinner updates.
 **/
void
ephy_spinner_set_timeout (EphySpinner *spinner,
                    guint timeout)
{
      EphySpinnerDetails *details = spinner->details;

      if (timeout != details->timeout)
      {
            ephy_spinner_stop (spinner);

            details->timeout = timeout;

            if (details->spinning)
            {
                  ephy_spinner_start (spinner);
            }
      }
}
#endif

gboolean
ephy_spinner_get_spinning (EphySpinner *spinner)
{
      EphySpinnerDetails *details = spinner->details;
      return details->spinning;
}

static void
ephy_spinner_size_request (GtkWidget *widget,
                     GtkRequisition *requisition)
{
      EphySpinner *spinner = EPHY_SPINNER (widget);
      EphySpinnerDetails *details = spinner->details;

      if ((details->need_load &&
           !ephy_spinner_load_images (spinner)) ||
            details->images == NULL)
      {
            requisition->width = requisition->height = 0;
            gtk_icon_size_lookup_for_settings (gtk_widget_get_settings (widget),
                                       details->size,
                                       &requisition->width,
                                         &requisition->height);
            return;
      }

      requisition->width = details->images->width;
      requisition->height = details->images->height;

      /* FIXME fix this hack */
      /* allocate some extra margin so we don't butt up against toolbar edges */
      if (details->size != GTK_ICON_SIZE_MENU)
      {
            requisition->width += 2;
            requisition->height += 2;
      }
}

static void
ephy_spinner_map (GtkWidget *widget)
{
      EphySpinner *spinner = EPHY_SPINNER (widget);
      EphySpinnerDetails *details = spinner->details;

      GTK_WIDGET_CLASS (parent_class)->map (widget);

      if (details->spinning)
      {
            ephy_spinner_start (spinner);
      }
}

static void
ephy_spinner_unmap (GtkWidget *widget)
{
      EphySpinner *spinner = EPHY_SPINNER (widget);

      ephy_spinner_remove_update_callback (spinner);

      GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}

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

      g_signal_handlers_disconnect_by_func
                  (spinner->details->icon_theme,
             G_CALLBACK (icon_theme_changed_cb), spinner);

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

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_unref (spinner->details->cache);

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

static void
ephy_spinner_screen_changed (GtkWidget *widget,
                       GdkScreen *old_screen)
{
      EphySpinner *spinner = EPHY_SPINNER (widget);
      EphySpinnerDetails *details = spinner->details;
      GdkScreen *screen;

      if (GTK_WIDGET_CLASS (parent_class)->screen_changed)
      {
            GTK_WIDGET_CLASS (parent_class)->screen_changed (widget, old_screen);
      }

      screen = gtk_widget_get_screen (widget);

      /* FIXME: this seems to be happening when then spinner is destroyed!? */
      if (old_screen == screen) return;

      /* We'll get mapped again on the new screen, but not unmapped from
       * the old screen, so remove timeout here.
       */
      ephy_spinner_remove_update_callback (spinner);

      ephy_spinner_unload_images (spinner);

      if (old_screen != NULL)
      {
            g_signal_handlers_disconnect_by_func
                  (gtk_icon_theme_get_for_screen (old_screen),
                   G_CALLBACK (icon_theme_changed_cb), spinner);
      }

      details->icon_theme = gtk_icon_theme_get_for_screen (screen);
      g_signal_connect (details->icon_theme, "changed",
                    G_CALLBACK (icon_theme_changed_cb), spinner);
}

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

      parent_class = g_type_class_peek_parent (class);

      object_class->dispose = ephy_spinner_dispose;
      object_class->finalize = ephy_spinner_finalize;

      widget_class->expose_event = ephy_spinner_expose;
      widget_class->size_request = ephy_spinner_size_request;
      widget_class->map = ephy_spinner_map;
      widget_class->unmap = ephy_spinner_unmap;
      widget_class->screen_changed = ephy_spinner_screen_changed;

      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, NULL));
}

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