Add atspi_text_notify_read_position

https://gitlab.gnome.org/GNOME/at-spi2-core/issues/10

1 files changed, 59 insertions, 0 deletions

diff --git a/atspi/atspi-text.c b/atspi/atspi-text.c
index a360f56c..24095606 100644
--- a/atspi/atspi-text.c
+++ b/atspi/atspi-text.c
@@ -962,6 +962,65 @@ atspi_text_scroll_substring_to_point (AtspiText *obj,
   return retval;
 }
 
+/**
+ * atspi_text_notify_read_position:
+ * @obj: the #AtspiText object being read.
+ * @offset: the offset of the text currently being read.
+ *
+ * Notifies interested listeners of the specific text that the screen
+ * reader is currently reading. This allows a magnifier to synchronize with
+ * the screen reader and highlight the text that is currently being read.
+ */
+void
+atspi_text_notify_read_position (AtspiText *obj,
+                                gint offset)
+{
+  DBusConnection *bus = _atspi_bus ();
+  DBusMessage *signal;
+  AtspiAccessible *accessible;
+  gint len;
+  static gint quark_text_len = 0;
+  gpointer plen;
+  DBusMessageIter iter, iter_struct;
+  gint remaining;
+
+  g_return_if_fail (obj != NULL);
+
+  accessible = ATSPI_ACCESSIBLE(obj);
+
+  if (!_atspi_prepare_screen_reader_interface ())
+    return;
+
+  if (!quark_text_len)
+    quark_text_len = g_quark_from_string ("accessible-text-len");
+
+  plen = g_object_get_qdata (accessible, quark_text_len);
+  if (plen)
+    len = (gint)plen;
+  else
+    {
+      len = atspi_text_get_character_count (obj, NULL);
+      plen = (gpointer)len;
+      g_object_set_qdata (accessible, quark_text_len, plen);
+    }
+
+  remaining = (len >= 0 ? len - offset : 0);
+
+  signal = dbus_message_new_signal (ATSPI_DBUS_PATH_SCREEN_READER,
+                                    ATSPI_DBUS_INTERFACE_SCREEN_READER,
+                                    "ReadingPosition");
+  dbus_message_iter_init_append (signal, &iter);
+  dbus_message_iter_open_container (&iter, DBUS_TYPE_STRUCT, NULL,
+                                    &iter_struct);
+  dbus_message_iter_append_basic (&iter_struct, DBUS_TYPE_STRING, &accessible->parent.app->bus_name);
+  dbus_message_iter_append_basic (&iter_struct, DBUS_TYPE_OBJECT_PATH, &accessible->parent.path);
+  dbus_message_iter_close_container (&iter, &iter_struct);
+  dbus_message_iter_append_basic (&iter, DBUS_TYPE_INT32, &offset);
+  dbus_message_iter_append_basic (&iter, DBUS_TYPE_INT32, &remaining);
+  dbus_connection_send (_atspi_bus (), signal, NULL);
+  dbus_message_unref (signal);
+}
+
 static void
 atspi_text_base_init (AtspiText *klass)
 {