libspi/application.c

   1 /*
   2  * AT-SPI - Assistive Technology Service Provider Interface
   3  * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
   4  *
   5  * Copyright 2001 Sun Microsystems Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 /*
  24  * application.c: implements SpiApplication.idl
  25  *
  26  */
  27 #include <string.h>
  28 #include <config.h>
  29 #include <bonobo/Bonobo.h>
  30 #include <atk/atkutil.h>
  31
  32 /*
  33  * This pulls the CORBA definitions for the "Accessibility::Accessible" server
  34  */
  35 #include <libspi/Accessibility.h>
  36
  37 /*
  38  * This pulls the definition for the BonoboObject (GObject Type)
  39  */
  40 #include "application.h"
  41
  42 /*
  43  * Our parent Gtk object type
  44  */
  45 #define PARENT_TYPE SPI_ACCESSIBLE_TYPE
  46
  47 /*
  48  * A pointer to our parent object class
  49  */
  50 static SpiAccessibleClass *spi_application_parent_class;
  51
  52 static SpiApplication *the_app;
  53
  54 /* static methods */
  55
  56 static void notify_listeners (GList *listeners,
  57                               Accessibility_Event *e,
  58                               CORBA_Environment *ev);
  59
  60 static char* lookup_toolkit_event_for_name (char *generic_name);
  61
  62 static char* reverse_lookup_name_for_toolkit_event (char *toolkit_name);
  63
  64 /*
  65  * Implemented GObject::finalize
  66  */
  67 static void
  68 spi_accessible_application_finalize (GObject *object)
  69 {
  70   /* TODO: any necessary cleanup */
  71   (G_OBJECT_CLASS (spi_application_parent_class))->finalize (object);
  72 }
  73
  74 static CORBA_string
  75 impl_accessibility_application_get_toolkit_name (PortableServer_Servant servant,
  76                                                  CORBA_Environment *ev)
  77 {
  78         return CORBA_string_dup (atk_get_toolkit_name ());
  79 }
  80
  81 static CORBA_string
  82 impl_accessibility_application_get_version (PortableServer_Servant servant,
  83                                             CORBA_Environment *ev)
  84 {
  85         return CORBA_string_dup (atk_get_toolkit_version ());
  86 }
  87
  88 static CORBA_long
  89 impl_accessibility_application_get_id (PortableServer_Servant servant,
  90                                        CORBA_Environment *ev)
  91 {
  92         SpiApplication *application = SPI_APPLICATION (
  93                 bonobo_object_from_servant (servant));
  94         return application->id;
  95 }
  96
  97 static void
  98 impl_accessibility_application_set_id (PortableServer_Servant servant,
  99                                        const CORBA_long id,
 100                                        CORBA_Environment *ev)
 101 {
 102         SpiApplication *application = SPI_APPLICATION (
 103                 bonobo_object_from_servant (servant));
 104         application->id = id;
 105 }
 106
 107 #define APP_STATIC_BUFF_SZ 64
 108
 109 static gboolean
 110 spi_application_object_event_listener (GSignalInvocationHint *signal_hint,
 111                                    guint n_param_values,
 112                                    const GValue *param_values,
 113                                    gpointer data)
 114 {
 115   Accessibility_Event *e = Accessibility_Event__alloc();
 116   AtkObject *aobject;
 117   GObject *gobject;
 118   SpiAccessible *source;
 119   CORBA_Environment ev;
 120   GSignalQuery signal_query;
 121   gchar *name;
 122   char sbuf[APP_STATIC_BUFF_SZ];
 123   char *generic_name;
 124
 125   g_signal_query (signal_hint->signal_id, &signal_query);
 126   name = signal_query.signal_name;
 127   fprintf (stderr, "Received (object) signal %s:%s\n",
 128            g_type_name (signal_query.itype), name);
 129
 130   /* TODO: move GTK dependency out of app.c into bridge */
 131   snprintf(sbuf, APP_STATIC_BUFF_SZ, "Gtk:%s:%s", g_type_name (signal_query.itype), name);
 132
 133   generic_name = reverse_lookup_name_for_toolkit_event (sbuf);
 134   gobject = g_value_get_object (param_values + 0);
 135
 136   /* notify the actual listeners */
 137   if (ATK_IS_IMPLEMENTOR (gobject))
 138   {
 139     aobject = atk_implementor_ref_accessible (ATK_IMPLEMENTOR (gobject));
 140   }
 141   else if (ATK_IS_OBJECT (gobject))
 142   {
 143     aobject = ATK_OBJECT (gobject);
 144     g_object_ref (G_OBJECT (aobject));
 145   }
 146   else
 147   {
 148     g_error("received event from non-AtkImplementor");
 149   }
 150
 151   g_return_val_if_fail (generic_name, FALSE);
 152   if (generic_name)
 153     {
 154         source = spi_accessible_new (aobject);
 155         e->type = CORBA_string_dup (generic_name);
 156         e->source = BONOBO_OBJREF (source);
 157         /*
 158          * no need to dup this ref, since it's inprocess
 159          * and will be dup'ed by (inprocess) notify_listeners() call below
 160          */
 161         e->detail1 = 0;
 162         e->detail2 = 0;
 163         if (the_app) notify_listeners (the_app->toolkit_listeners, e, &ev);
 164         /* unref because the in-process notify has called b_o_dup_ref (e->source) */
 165         bonobo_object_release_unref (e->source, &ev);
 166     }
 167   /* and, decrement the refcount on atkobject, incremented moments ago:
 168    *  the call to spi_accessible_new() above should have added an extra ref */
 169   g_object_unref (G_OBJECT (aobject));
 170
 171   return TRUE;
 172 }
 173
 174
 175 static gboolean
 176 spi_application_toolkit_event_listener (GSignalInvocationHint *signal_hint,
 177                                     guint n_param_values,
 178                                     const GValue *param_values,
 179                                     gpointer data)
 180 {
 181   Accessibility_Event *e = Accessibility_Event__alloc();
 182   AtkObject *aobject;
 183   GObject *gobject;
 184   SpiAccessible *source;
 185   CORBA_Environment ev;
 186   GSignalQuery signal_query;
 187   gchar *name;
 188   char sbuf[APP_STATIC_BUFF_SZ];
 189
 190   g_signal_query (signal_hint->signal_id, &signal_query);
 191   name = signal_query.signal_name;
 192   fprintf (stderr, "Received signal %s:%s\n", g_type_name (signal_query.itype), name);
 193
 194   /* TODO: move GTK dependency out of app.c into bridge */
 195   snprintf(sbuf, APP_STATIC_BUFF_SZ, "Gtk:%s:%s", g_type_name (signal_query.itype), name);
 196
 197   gobject = g_value_get_object (param_values + 0);
 198   /* notify the actual listeners */
 199   if (ATK_IS_IMPLEMENTOR (gobject))
 200     {
 201       aobject = atk_implementor_ref_accessible (ATK_IMPLEMENTOR (gobject));
 202       source = spi_accessible_new (aobject);
 203       e->type = CORBA_string_dup (sbuf);
 204       e->source = BONOBO_OBJREF (source);
 205       e->detail1 = 0;
 206       e->detail2 = 0;
 207       if (the_app) notify_listeners (the_app->toolkit_listeners, e, &ev);
 208       bonobo_object_unref (source);
 209       g_object_unref (G_OBJECT (aobject));
 210     }
 211   return TRUE;
 212 }
 213
 214 static void
 215 impl_accessibility_application_register_toolkit_event_listener (PortableServer_Servant servant,
 216                                                                 Accessibility_EventListener listener,
 217                                                                 const CORBA_char *event_name,
 218                                                                 CORBA_Environment *ev)
 219 {
 220   guint spi_listener_id;
 221   spi_listener_id =
 222      atk_add_global_event_listener (spi_application_toolkit_event_listener, event_name);
 223   the_app->toolkit_listeners = g_list_append (the_app->toolkit_listeners,
 224                                               CORBA_Object_duplicate (listener, ev));
 225 #ifdef SPI_DEBUG
 226   fprintf (stderr, "registered %d for toolkit events named: %s\n",
 227            spi_listener_id,
 228            event_name);
 229 #endif
 230 }
 231
 232 static void
 233 impl_accessibility_application_register_object_event_listener (PortableServer_Servant servant,
 234                                                                Accessibility_EventListener listener,
 235                                                                const CORBA_char *event_name,
 236                                                                CORBA_Environment *ev)
 237 {
 238   guint spi_listener_id;
 239   char *toolkit_specific_event_name = lookup_toolkit_event_for_name (event_name);
 240   if (toolkit_specific_event_name)
 241   {
 242     spi_listener_id =
 243        atk_add_global_event_listener (spi_application_object_event_listener,
 244                                       CORBA_string_dup (toolkit_specific_event_name));
 245     the_app->toolkit_listeners = g_list_append (the_app->toolkit_listeners,
 246                                               CORBA_Object_duplicate (listener, ev));
 247   }
 248 #ifdef SPI_DEBUG
 249   fprintf (stderr, "registered %d for object events named: %s\n",
 250            spi_listener_id,
 251            event_name);
 252 #endif
 253 }
 254
 255 static void
 256 notify_listeners (GList *listeners, Accessibility_Event *e, CORBA_Environment *ev)
 257 {
 258     int n_listeners=0;
 259     int i;
 260     if (listeners) n_listeners = g_list_length (listeners);
 261
 262     for (i=0; i<n_listeners; ++i) {
 263         Accessibility_EventListener listener;
 264         e->source = bonobo_object_dup_ref (e->source, ev);
 265         listener = (Accessibility_EventListener) g_list_nth_data (listeners, i);
 266         Accessibility_EventListener_notifyEvent (listener, e, ev);
 267         /*
 268          * when this (oneway) call completes, the CORBA refcount and
 269          * Bonobo_Unknown refcount will be decremented by the recipient
 270          */
 271     }
 272 }
 273
 274 static char *
 275 lookup_toolkit_event_for_name (char *generic_name)
 276 {
 277     char *toolkit_specific_name;
 278     SpiApplicationClass *klass = g_type_class_peek (SPI_APPLICATION_TYPE);
 279 #ifdef SPI_DEBUG
 280     fprintf (stderr, "looking for %s in hash table.\n", generic_name);
 281 #endif
 282     toolkit_specific_name =
 283             (char *) g_hash_table_lookup (klass->toolkit_event_names, generic_name);
 284 #ifdef SPI_DEBUG
 285     fprintf (stderr, "generic event %s converted to %s\n", generic_name, toolkit_specific_name);
 286 #endif
 287     return toolkit_specific_name;
 288 }
 289
 290 static char *
 291 reverse_lookup_name_for_toolkit_event (char *toolkit_specific_name)
 292 {
 293     char *generic_name;
 294     SpiApplicationClass *klass = g_type_class_peek (SPI_APPLICATION_TYPE);
 295 #ifdef SPI_DEBUG
 296     fprintf (stderr, "(reverse lookup) looking for %s in hash table.\n", toolkit_specific_name);
 297 #endif
 298     generic_name =
 299             (char *) g_hash_table_lookup (klass->generic_event_names, toolkit_specific_name);
 300 #ifdef SPI_DEBUG
 301     fprintf (stderr, "toolkit event %s converted to %s\n", toolkit_specific_name, generic_name);
 302 #endif
 303     return generic_name;
 304 }
 305
 306 static void
 307 init_toolkit_names (GHashTable **generic_event_names, GHashTable **toolkit_event_names)
 308 {
 309         *toolkit_event_names = g_hash_table_new (g_str_hash, g_str_equal);
 310         *generic_event_names = g_hash_table_new (g_str_hash, g_str_equal);
 311         g_hash_table_insert (*toolkit_event_names,
 312                              "object:property-change",
 313                              "Gtk:AtkObject:property-change");
 314         g_hash_table_insert (*generic_event_names,
 315                              "Gtk:AtkObject:property-change",
 316                              "object:property-change");
 317 #ifdef SPI_DEBUG
 318         fprintf (stderr, "inserted spi_selection_changed hash\n");
 319 #endif
 320 }
 321
 322 static void
 323 spi_application_class_init (SpiApplicationClass *klass)
 324 {
 325   GObjectClass * object_class = (GObjectClass *) klass;
 326   POA_Accessibility_Application__epv *epv = &klass->epv;
 327
 328   spi_application_parent_class = g_type_class_ref (SPI_ACCESSIBLE_TYPE);
 329
 330   object_class->finalize = spi_accessible_application_finalize;
 331
 332   epv->_get_toolkitName = impl_accessibility_application_get_toolkit_name;
 333   epv->_get_version = impl_accessibility_application_get_version;
 334   epv->_get_id = impl_accessibility_application_get_id;
 335   epv->_set_id = impl_accessibility_application_set_id;
 336   epv->registerToolkitEventListener = impl_accessibility_application_register_toolkit_event_listener;
 337   init_toolkit_names (&klass->generic_event_names, &klass->toolkit_event_names);
 338 }
 339
 340 static void
 341 spi_application_init (SpiApplication  *application)
 342 {
 343   SPI_ACCESSIBLE (application)->atko = g_object_new (atk_object_get_type(), NULL);
 344   application->toolkit_listeners = (GList *) NULL;
 345   the_app = application;
 346 }
 347
 348 GType
 349 spi_application_get_type (void)
 350 {
 351         static GType type = 0;
 352
 353         if (!type) {
 354                 static const GTypeInfo tinfo = {
 355                         sizeof (SpiApplicationClass),
 356                         (GBaseInitFunc) NULL,
 357                         (GBaseFinalizeFunc) NULL,
 358                         (GClassInitFunc) spi_application_class_init,
 359                         (GClassFinalizeFunc) NULL,
 360                         NULL, /* class data */
 361                         sizeof (SpiApplication),
 362                         0, /* n preallocs */
 363                         (GInstanceInitFunc) spi_application_init,
 364                         NULL /* value table */
 365                 };
 366                 /*
 367                  * Bonobo_type_unique auto-generates a load of
 368                  * CORBA structures for us. All derived types must
 369                  * use bonobo_type_unique.
 370                  */
 371                 type = bonobo_type_unique (
 372                         PARENT_TYPE,
 373                         POA_Accessibility_Application__init,
 374                         NULL,
 375                         G_STRUCT_OFFSET (SpiApplicationClass, epv),
 376                         &tinfo,
 377                         "SpiApplication");
 378         }
 379
 380         return type;
 381 }
 382
 383 SpiApplication *
 384 spi_application_new (AtkObject *app_root)
 385 {
 386     SpiApplication *retval =
 387                SPI_APPLICATION (g_object_new (spi_application_get_type (), NULL));
 388     SPI_ACCESSIBLE (retval)->atko = app_root;
 389     g_object_ref (G_OBJECT (app_root));
 390     return retval;
 391 }