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 #if defined(ATK_DISABLE_SINGLE_INCLUDES) && !defined (__ATK_H_INSIDE__) && !defined (ATK_COMPILATION)
  21 #error "Only <atk/atk.h> can be included directly."
  22 #endif
  23
  24 #ifndef __ATK_STREAMABLE_CONTENT_H__
  25 #define __ATK_STREAMABLE_CONTENT_H__
  26
  27 #include <atk/atkobject.h>
  28
  29 G_BEGIN_DECLS
  30
  31 #define ATK_TYPE_STREAMABLE_CONTENT           (atk_streamable_content_get_type ())
  32 #define ATK_IS_STREAMABLE_CONTENT(obj)        G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_STREAMABLE_CONTENT)
  33 #define ATK_STREAMABLE_CONTENT(obj)           G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContent)
  34 #define ATK_STREAMABLE_CONTENT_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_STREAMABLE_CONTENT, AtkStreamableContentIface))
  35
  36 #ifndef _TYPEDEF_ATK_STREAMABLE_CONTENT
  37 #define _TYPEDEF_ATK_STREAMABLE_CONTENT
  38 typedef struct _AtkStreamableContent AtkStreamableContent;
  39 #endif
  40 typedef struct _AtkStreamableContentIface AtkStreamableContentIface;
  41
  42 struct _AtkStreamableContentIface
  43 {
  44   GTypeInterface parent;
  45
  46   /*
  47    * Get the number of mime types supported by this object
  48    */
  49   gint                      (* get_n_mime_types)  (AtkStreamableContent     *streamable);
  50   /*
  51    * Gets the specified mime type supported by this object.
  52    * The mime types are 0-based so the first mime type is
  53    * at index 0, the second at index 1 and so on.  The mime-type
  54    * at index 0 should be considered the "default" data type for the stream.
  55    *
  56    * This assumes that the strings for the mime types are stored in the
  57    * AtkStreamableContent. Alternatively the const could be removed
  58    * and the caller would be responsible for calling g_free() on the
  59    * returned value.
  60    */
  61   const gchar*              (* get_mime_type)     (AtkStreamableContent     *streamable,
  62                                                    gint                     i);
  63   /*
  64    * One possible implementation for this method is that it constructs the
  65    * content appropriate for the mime type and then creates a temporary
  66    * file containing the content, opens the file and then calls
  67    * g_io_channel_unix_new_fd().
  68    */
  69   GIOChannel*               (* get_stream)        (AtkStreamableContent     *streamable,
  70                                                    const gchar              *mime_type);
  71
  72 /*
  73  * Returns a string representing a URI in IETF standard format
  74  * (see http://www.ietf.org/rfc/rfc2396.txt) from which the object's content
  75  * may be streamed in the specified mime-type.
  76  * If mime_type is NULL, the URI for the default (and possibly only) mime-type is
  77  * returned.
  78  *
  79  * returns NULL if the mime-type is not supported, or if no URI can be
  80  * constructed.  Note that it is possible for get_uri to return NULL but for
  81  * get_stream to work nonetheless, since not all GIOChannels connect to URIs.
  82  */
  83     const  gchar*           (* get_uri)           (AtkStreamableContent     *streamable,
  84                                                    const gchar              *mime_type);
  85
  86
  87   AtkFunction               pad1;
  88   AtkFunction               pad2;
  89   AtkFunction               pad3;
  90 };
  91 ATK_AVAILABLE_IN_ALL
  92 GType                  atk_streamable_content_get_type (void);
  93
  94 ATK_AVAILABLE_IN_ALL
  95 gint                   atk_streamable_content_get_n_mime_types (AtkStreamableContent     *streamable);
  96
  97 ATK_AVAILABLE_IN_ALL
  98 const gchar*           atk_streamable_content_get_mime_type    (AtkStreamableContent     *streamable,
  99                                                                 gint                     i);
 100 ATK_AVAILABLE_IN_ALL
 101 GIOChannel*             atk_streamable_content_get_stream       (AtkStreamableContent     *streamable,
 102                                                                  const gchar              *mime_type);
 103
 104 ATK_AVAILABLE_IN_ALL
 105 const gchar*           atk_streamable_content_get_uri          (AtkStreamableContent     *streamable,
 106                                                                 const gchar              *mime_type);
 107
 108 G_END_DECLS
 109
 110 #endif /* __ATK_STREAMABLE_CONTENT_H__ */