atk/atksocket.c

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright (C) 2009 Novell, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "atk.h"
  23 #include "atksocket.h"
  24
  25 /**
  26  * SECTION:atksocket
  27  * @Short_description: Container for AtkPlug objects from other processes
  28  * @Title: AtkSocket
  29  * @See_also: #AtkPlug
  30  *
  31  * Together with #AtkPlug, #AtkSocket provides the ability to embed
  32  * accessibles from one process into another in a fashion that is
  33  * transparent to assistive technologies. #AtkSocket works as the
  34  * container of #AtkPlug, embedding it using the method
  35  * atk_socket_embed(). Any accessible contained in the #AtkPlug will
  36  * appear to the assistive technologies as being inside the
  37  * application that created the #AtkSocket.
  38  *
  39  * The communication between a #AtkSocket and a #AtkPlug is done by
  40  * the IPC layer of the accessibility framework, normally implemented
  41  * by the D-Bus based implementation of AT-SPI (at-spi2). If that is
  42  * the case, at-spi-atk2 is the responsible to implement the abstract
  43  * methods atk_plug_get_id() and atk_socket_embed(), so an ATK
  44  * implementor shouldn't reimplement them. The process that contains
  45  * the #AtkPlug is responsible to send the ID returned by
  46  * atk_plug_id() to the process that contains the #AtkSocket, so it
  47  * could call the method atk_socket_embed() in order to embed it.
  48  *
  49  * For the same reasons, an implementor doesn't need to implement
  50  * atk_object_get_n_accessible_children() and
  51  * atk_object_ref_accessible_child(). All the logic related to those
  52  * functions will be implemented by the IPC layer.
  53  */
  54
  55 static void atk_socket_class_init (AtkSocketClass *klass);
  56 static void atk_socket_finalize   (GObject *obj);
  57
  58 static void atk_component_interface_init (AtkComponentIface *iface);
  59
  60 G_DEFINE_TYPE_WITH_CODE (AtkSocket, atk_socket, ATK_TYPE_OBJECT,
  61                          G_IMPLEMENT_INTERFACE (ATK_TYPE_COMPONENT, atk_component_interface_init))
  62
  63 static void
  64 atk_socket_init (AtkSocket* obj)
  65 {
  66   obj->embedded_plug_id = NULL;
  67 }
  68
  69 static void
  70 atk_socket_class_init (AtkSocketClass* klass)
  71 {
  72   GObjectClass *obj_class = G_OBJECT_CLASS (klass);
  73
  74   obj_class->finalize = atk_socket_finalize;
  75
  76   klass->embed = NULL;
  77 }
  78
  79 static void
  80 atk_socket_finalize (GObject *_obj)
  81 {
  82   AtkSocket *obj = ATK_SOCKET (_obj);
  83
  84   g_free (obj->embedded_plug_id);
  85   obj->embedded_plug_id = NULL;
  86
  87   G_OBJECT_CLASS (atk_socket_parent_class)->finalize (_obj);
  88 }
  89
  90 static void atk_component_interface_init (AtkComponentIface *iface)
  91 {
  92 }
  93
  94 AtkObject*
  95 atk_socket_new (void)
  96 {
  97   AtkObject* accessible;
  98
  99   accessible = g_object_new (ATK_TYPE_SOCKET, NULL);
 100   g_return_val_if_fail (accessible != NULL, NULL);
 101
 102   accessible->role = ATK_ROLE_FILLER;
 103   accessible->layer = ATK_LAYER_WIDGET;
 104
 105   return accessible;
 106 }
 107
 108 /**
 109  * atk_socket_embed:
 110  * @obj: an #AtkSocket
 111  * @plug_id: the ID of an #AtkPlug
 112  *
 113  * Embeds the children of an #AtkPlug as the children of the
 114  * #AtkSocket. The plug may be in the same process or in a different
 115  * process.
 116  *
 117  * The class item used by this function should be filled in by the IPC
 118  * layer (usually at-spi2-atk). The implementor of the AtkSocket
 119  * should call this function and pass the id for the plug as returned
 120  * by atk_plug_get_id().  It is the responsibility of the application
 121  * to pass the plug id on to the process implementing the #AtkSocket
 122  * as needed.
 123  *
 124  * Since: 1.30
 125  **/
 126 void
 127 atk_socket_embed (AtkSocket* obj, gchar* plug_id)
 128 {
 129   AtkSocketClass *klass;
 130
 131   g_return_if_fail (plug_id != NULL);
 132   g_return_if_fail (ATK_IS_SOCKET (obj));
 133
 134   klass = g_type_class_peek (ATK_TYPE_SOCKET);
 135   if (klass && klass->embed)
 136     {
 137       if (obj->embedded_plug_id)
 138         g_free (obj->embedded_plug_id);
 139       obj->embedded_plug_id = g_strdup (plug_id);
 140       (klass->embed) (obj, plug_id);
 141     }
 142 }
 143
 144 /**
 145  * atk_socket_is_occupied:
 146  * @obj: an #AtkSocket
 147  *
 148  * Determines whether or not the socket has an embedded plug.
 149  *
 150  * Returns: TRUE if a plug is embedded in the socket
 151  *
 152  * Since: 1.30
 153  **/
 154 gboolean
 155 atk_socket_is_occupied (AtkSocket* obj)
 156 {
 157   g_return_val_if_fail (ATK_IS_SOCKET (obj), FALSE);
 158
 159   return (obj->embedded_plug_id != NULL);
 160 }