other-licenses/atk-1.0/atk/atkstreamablecontent.h

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2001 Sun Microsystems Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 #ifndef __ATK_STREAMABLE_CONTENT_H__
  21 #define __ATK_STREAMABLE_CONTENT_H__
  22
  23 #include <atk/atkobject.h>
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif /* __cplusplus */
  28
  29 #define ATK_TYPE_STREAMABLE_CONTENT           (atk_streamable_content_get_type ())
  30 #define ATK_IS_STREAMABLE_CONTENT(obj)        G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_STREAMABLE_CONTENT)
  31 #define ATK_STREAMABLE_CONTENT(obj)           G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContent)
  32 #define ATK_STREAMABLE_CONTENT_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContentIface))
  33
  34 #ifndef _TYPEDEF_ATK_STREAMABLE_CONTENT
  35 #define _TYPEDEF_ATK_STREAMABLE_CONTENT
  36 typedef struct _AtkStreamableContent AtkStreamableContent;
  37 #endif
  38 typedef struct _AtkStreamableContentIface AtkStreamableContentIface;
  39
  40 struct _AtkStreamableContentIface
  41 {
  42   GTypeInterface parent;
  43
  44   /*
  45    * Get the number of mime types supported by this object
  46    */
  47   gint                      (* get_n_mime_types)  (AtkStreamableContent     *streamable);
  48   /*
  49    * Gets the specified mime type supported by this object.
  50    * The mime types are 0-based so the first mime type is
  51    * at index 0, the second at index 1 and so on.  The mime-type
  52    * at index 0 should be considered the "default" data type for the stream.
  53    *
  54    * This assumes that the strings for the mime types are stored in the
  55    * AtkStreamableContent. Alternatively the G_CONST_RETURN could be removed
  56    * and the caller would be responsible for calling g_free() on the
  57    * returned value.
  58    */
  59   G_CONST_RETURN gchar*     (* get_mime_type)     (AtkStreamableContent     *streamable,
  60                                                    gint                     i);
  61   /*
  62    * One possible implementation for this method is that it constructs the
  63    * content appropriate for the mime type and then creates a temporary
  64    * file containing the content, opens the file and then calls
  65    * g_io_channel_unix_new_fd().
  66    */
  67   GIOChannel*               (* get_stream)        (AtkStreamableContent     *streamable,
  68                                                    const gchar              *mime_type);
  69
  70 /*
  71  * Returns a string representing a URI in IETF standard format
  72  * (see http://www.ietf.org/rfc/rfc2396.txt) from which the object's content
  73  * may be streamed in the specified mime-type.
  74  * If mime_type is NULL, the URI for the default (and possibly only) mime-type is
  75  * returned.
  76  *
  77  * returns NULL if the mime-type is not supported, or if no URI can be
  78  * constructed.  Note that it is possible for get_uri to return NULL but for
  79  * get_stream to work nonetheless, since not all GIOChannels connect to URIs.
  80  */
  81     G_CONST_RETURN  gchar*  (* get_uri)           (AtkStreamableContent     *streamable,
  82                                                    const gchar              *mime_type);
  83
  84
  85   AtkFunction               pad1;
  86   AtkFunction               pad2;
  87   AtkFunction               pad3;
  88 };
  89 GType                  atk_streamable_content_get_type (void);
  90
  91 gint                   atk_streamable_content_get_n_mime_types (AtkStreamableContent     *streamable);
  92
  93 G_CONST_RETURN gchar*  atk_streamable_content_get_mime_type    (AtkStreamableContent     *streamable,
  94                                                                 gint                     i);
  95 GIOChannel*             atk_streamable_content_get_stream       (AtkStreamableContent     *streamable,
  96                                                                  const gchar              *mime_type);
  97
  98 gchar*                  atk_streamable_content_get_uri          (AtkStreamableContent     *streamable,
  99                                                                  const gchar              *mime_type);
 100
 101
 102 #ifdef __cplusplus
 103 }
 104 #endif /* __cplusplus */
 105
 106
 107 #endif /* __ATK_STREAMABLE_CONTENT_H__ */