lib/event/event.c

   1 /*
   2    Handle  events in application.
   3    Interface functions: init/deinit; start/stop
   4
   5    Copyright (C) 2011 The Free Software Foundation, Inc.
   6
   7    Written by:
   8    Slava Zanko <slavazanko@gmail.com>, 2011.
   9
  10    This file is part of the Midnight Commander.
  11
  12    The Midnight Commander is free software; you can redistribute it
  13    and/or modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation; either version 2 of the
  15    License, or (at your option) any later version.
  16
  17    The Midnight Commander is distributed in the hope that it will be
  18    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  19    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  25    MA 02110-1301, USA.
  26  */
  27
  28 #include <config.h>
  29
  30 #include "lib/global.h"
  31 #include "lib/event.h"
  32
  33 #include "internal.h"
  34
  35 /*** global variables ****************************************************************************/
  36
  37 /*** file scope macro definitions ****************************************************************/
  38
  39 /*** file scope type declarations ****************************************************************/
  40
  41 /*** file scope variables ************************************************************************/
  42
  43 GTree *mc_event_grouplist = NULL;
  44
  45 /*** file scope functions ************************************************************************/
  46 /* --------------------------------------------------------------------------------------------- */
  47 /*** public functions ****************************************************************************/
  48 /* --------------------------------------------------------------------------------------------- */
  49
  50 gboolean
  51 mc_event_init (GError ** mcerror)
  52 {
  53     if (mc_event_grouplist != NULL)
  54     {
  55         g_propagate_error (mcerror,
  56                            g_error_new (MC_ERROR, 1,
  57                                         _("Event system already initialized")));
  58         return FALSE;
  59     }
  60
  61     mc_event_grouplist =
  62         g_tree_new_full ((GCompareDataFunc) g_ascii_strcasecmp,
  63                          NULL, (GDestroyNotify) g_free, (GDestroyNotify) g_tree_destroy);
  64
  65     if (mc_event_grouplist == NULL)
  66     {
  67         g_propagate_error (mcerror,
  68                            g_error_new (MC_ERROR, 2,
  69                                         _("Failed to initialize event system")));
  70         return FALSE;
  71     }
  72
  73     return TRUE;
  74 }
  75
  76 /* --------------------------------------------------------------------------------------------- */
  77
  78 gboolean
  79 mc_event_deinit (GError ** mcerror)
  80 {
  81     if (mc_event_grouplist == NULL)
  82     {
  83         g_propagate_error (mcerror,
  84                            g_error_new (MC_ERROR, 1,
  85                                         _("Event system not initialized")));
  86         return FALSE;
  87     }
  88
  89     g_tree_destroy (mc_event_grouplist);
  90     mc_event_grouplist = NULL;
  91     return TRUE;
  92 }
  93
  94 /* --------------------------------------------------------------------------------------------- */
  95
  96 gboolean
  97 mc_event_mass_add (event_init_t * events, GError ** mcerror)
  98 {
  99     size_t array_index;
 100
 101     for (array_index = 0; events[array_index].event_group_name != NULL; array_index++)
 102     {
 103         if (!mc_event_add (events[array_index].event_group_name,
 104                            events[array_index].event_name,
 105                            events[array_index].cb, events[array_index].init_data, mcerror))
 106         {
 107             return FALSE;
 108         }
 109     }
 110     return TRUE;
 111 }
 112
 113 /* --------------------------------------------------------------------------------------------- */
 114
 115 gboolean
 116 mc_event_present (const gchar *event_group_name, const gchar *event_name)
 117 {
 118     GTree *event_group;
 119     GPtrArray *callbacks;
 120
 121     if (mc_event_grouplist == NULL || event_group_name == NULL || event_name == NULL)
 122         return FALSE;
 123
 124     event_group = mc_event_get_event_group_by_name (event_group_name, FALSE, NULL);
 125     if (event_group == NULL)
 126         return FALSE;
 127
 128     callbacks = mc_event_get_event_by_name (event_group, event_name, FALSE, NULL);
 129     if (callbacks == NULL)
 130         return FALSE;
 131
 132     return TRUE;
 133 }
 134
 135 /* --------------------------------------------------------------------------------------------- */