git.maemo.org Git - modest/blob - src/modest-signal-mgr.c

   1 /* Copyright (c) 2006, Nokia Corporation
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  * * Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  * * Redistributions in binary form must reproduce the above copyright
  11  *   notice, this list of conditions and the following disclaimer in the
  12  *   documentation and/or other materials provided with the distribution.
  13  * * Neither the name of the Nokia Corporation nor the names of its
  14  *   contributors may be used to endorse or promote products derived from
  15  *   this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  18  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  20  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  21  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  24  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  26  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  27  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "modest-signal-mgr.h"
  31 #include <string.h>
  32
  33 typedef struct {
  34         guint handler_id;
  35         gchar *signal_name;
  36         GObject *obj;
  37 } SignalHandler;
  38
  39 GSList *
  40 modest_signal_mgr_connect (GSList *lst,
  41                            GObject *instance,
  42                            const gchar *signal_name,
  43                            GCallback handler,
  44                            gpointer data)
  45 {
  46         SignalHandler *sighandler;
  47
  48         g_return_val_if_fail (instance, lst);
  49         g_return_val_if_fail (signal_name, lst);
  50         g_return_val_if_fail (handler, lst);
  51
  52         sighandler = g_new (SignalHandler, 1);
  53         sighandler->obj         = g_object_ref (instance);
  54         sighandler->handler_id  = g_signal_connect (instance, signal_name, handler, data);
  55         sighandler->signal_name = g_strdup (signal_name);
  56
  57         return g_slist_prepend (lst, (gpointer)sighandler);
  58 }
  59
  60
  61 void
  62 modest_signal_mgr_disconnect_all_and_destroy (GSList *lst)
  63 {
  64         GSList *cursor;
  65         for (cursor = lst; cursor; cursor = g_slist_next(cursor)) {
  66                 SignalHandler *handler;
  67                 handler = (SignalHandler*)cursor->data;
  68                 if (handler && handler->obj && G_IS_OBJECT(handler->obj)) {
  69                         if (g_signal_handler_is_connected (handler->obj, handler->handler_id)) {
  70                                 g_signal_handler_disconnect (handler->obj, handler->handler_id);
  71                         }
  72                         g_object_unref (handler->obj);
  73                         g_free (handler->signal_name);
  74                         handler->obj = NULL;
  75                 }
  76                 g_free (handler);
  77         }
  78         g_slist_free (lst);
  79 }
  80
  81 static gboolean
  82 obj_in_a_signal_handler (gconstpointer a,
  83                          gconstpointer b)
  84 {
  85         SignalHandler *handler, *list_item_handler;
  86
  87         list_item_handler = (SignalHandler *) a;
  88         handler = (SignalHandler *) b;
  89
  90         if (list_item_handler->obj == handler->obj &&
  91             !strcmp (list_item_handler->signal_name, handler->signal_name))
  92                 return FALSE;
  93         else
  94                 return TRUE;
  95 }
  96
  97 GSList *
  98 modest_signal_mgr_disconnect (GSList *list,
  99                               GObject *instance,
 100                               const gchar *signal_name)
 101 {
 102         GSList *item = NULL;
 103         SignalHandler *signal_handler = NULL, *tmp = NULL;
 104
 105         tmp = g_new (SignalHandler, 1);
 106         tmp->obj = instance;
 107         tmp->signal_name = g_strdup (signal_name);
 108
 109         /* Find the element */
 110         item = g_slist_find_custom (list, tmp, obj_in_a_signal_handler);
 111         g_return_val_if_fail (item != NULL, list);
 112
 113         /* Disconnect the signal */
 114         signal_handler = (SignalHandler *) item->data;
 115         g_signal_handler_disconnect (signal_handler->obj, signal_handler->handler_id);
 116
 117         /* Free the handlers */
 118         g_object_unref (signal_handler->obj);
 119         g_free (signal_handler->signal_name);
 120         g_free (signal_handler);
 121         g_free (tmp->signal_name);
 122         g_free (tmp);
 123
 124         /* Remove item from list */
 125         return g_slist_delete_link (list, item);
 126 }
 127
 128 gboolean
 129 modest_signal_mgr_is_connected (GSList *list,
 130                                 GObject *instance,
 131                                 const gchar *signal_name)
 132 {
 133         GSList *item = NULL;
 134         SignalHandler *tmp = NULL;
 135
 136         /* Build the helper object */
 137         tmp = g_new (SignalHandler, 1);
 138         tmp->obj = instance;
 139         tmp->signal_name = g_strdup (signal_name);
 140
 141         /* Find the element */
 142         item = g_slist_find_custom (list, tmp, obj_in_a_signal_handler);
 143
 144         /* Free the handlers */
 145         g_free (tmp->signal_name);
 146         g_free (tmp);
 147
 148         return (item != NULL) ? TRUE : FALSE;
 149 }