/* ATK -  Accessibility Toolkit
 * Copyright 2001 Sun Microsystems Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include "atkdocument.h"

/**
 * SECTION:atkdocument
 * @Short_description: The ATK interface which represents the toplevel
 *  container for document content.
 * @Title:AtkDocument
 *
 * The AtkDocument interface should be supported by any object whose
 * content is a representation or view of a document.  The AtkDocument
 * interface should appear on the toplevel container for the document
 * content; however AtkDocument instances may be nested (i.e. an
 * AtkDocument may be a descendant of another AtkDocument) in those
 * cases where one document contains "embedded content" which can
 * reasonably be considered a document in its own right.
 *
 */

enum {
  LOAD_COMPLETE,
  RELOAD,
  LOAD_STOPPED,
  PAGE_CHANGED,
  LAST_SIGNAL
};

static void atk_document_base_init (AtkDocumentIface *class);

static guint atk_document_signals[LAST_SIGNAL] = {0};

GType
atk_document_get_type (void)
{
  static GType type = 0;

  if (!type) {
    static const GTypeInfo tinfo =
    {
      sizeof (AtkDocumentIface),
      (GBaseInitFunc) atk_document_base_init,
      (GBaseFinalizeFunc) NULL,

    };

    type = g_type_register_static (G_TYPE_INTERFACE, "AtkDocument", &tinfo, 0);
  }

  return type;
}

static void
atk_document_base_init (AtkDocumentIface *class)
{
  static gboolean initialized = FALSE;
  if (!initialized)
    {
      /**
       * AtkDocument::load-complete:
       * @atkdocument: the object which received the signal.
       *
       * The 'load-complete' signal is emitted when a pending load of
       * a static document has completed.  This signal is to be
       * expected by ATK clients if and when AtkDocument implementors
       * expose ATK_STATE_BUSY.  If the state of an AtkObject which
       * implements AtkDocument does not include ATK_STATE_BUSY, it
       * should be safe for clients to assume that the AtkDocument's
       * static contents are fully loaded into the container.
       * (Dynamic document contents should be exposed via other
       * signals.)
       */
      atk_document_signals[LOAD_COMPLETE] =
        g_signal_new ("load_complete",
                      ATK_TYPE_DOCUMENT,
                      G_SIGNAL_RUN_LAST,
                      0,
                      (GSignalAccumulator) NULL, NULL,
                      g_cclosure_marshal_VOID__VOID,
                      G_TYPE_NONE, 0);
      /**
       * AtkDocument::reload:
       * @atkdocument: the object which received the signal.
       *
       * The 'reload' signal is emitted when the contents of a
       * document is refreshed from its source.  Once 'reload' has
       * been emitted, a matching 'load-complete' or 'load-stopped'
       * signal should follow, which clients may await before
       * interrogating ATK for the latest document content.
       */
      atk_document_signals[RELOAD] =
        g_signal_new ("reload",
                      ATK_TYPE_DOCUMENT,
                      G_SIGNAL_RUN_LAST,
                      0,
                      (GSignalAccumulator) NULL, NULL,
                      g_cclosure_marshal_VOID__VOID,
                      G_TYPE_NONE, 0);

      /**
       * AtkDocument::load-stopped:
       * @atkdocument: the object which received the signal.
       *
       * The 'load-stopped' signal is emitted when a pending load of
       * document contents is cancelled, paused, or otherwise
       * interrupted by the user or application logic.  It should not
       * however be emitted while waiting for a resource (for instance
       * while blocking on a file or network read) unless a
       * user-significant timeout has occurred.
       */
      atk_document_signals[LOAD_STOPPED] =
        g_signal_new ("load_stopped",
                      ATK_TYPE_DOCUMENT,
                      G_SIGNAL_RUN_LAST,
                      0,
                      (GSignalAccumulator) NULL, NULL,
                      g_cclosure_marshal_VOID__VOID,
                      G_TYPE_NONE, 0);

      /**
       * AtkDocument::page-changed:
       * @atkdocument: the object on which the signal was emitted
       * @page_number: the new page number. If this value is unknown
       * or not applicable, -1 should be provided.
       *
       * The 'page-changed' signal is emitted when the current page of
       * a document changes, e.g. pressing page up/down in a document
       * viewer.
       *
       * Since: 2.12
       */
      atk_document_signals[PAGE_CHANGED] =
        g_signal_new ("page_changed",
                      ATK_TYPE_DOCUMENT,
                      G_SIGNAL_RUN_LAST,
                      0,
                      (GSignalAccumulator) NULL, NULL,
                      g_cclosure_marshal_VOID__INT,
                      G_TYPE_NONE, 1, G_TYPE_INT);

      initialized = TRUE;
    }
}

/**
 * atk_document_get_document_type: (virtual get_document_type)
 * @document: a #GObject instance that implements AtkDocumentIface
 *
 * Gets a string indicating the document type.
 *
 * Deprecated: Since 2.12. Please use atk_document_get_attributes() to
 * ask for the document type if it applies.
 *
 * Returns: a string indicating the document type
 **/
const gchar*
atk_document_get_document_type (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), NULL);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_document_type)
    {
      return (iface->get_document_type) (document);
    }
  else
    {
      return NULL;
    }
}

/**
 * atk_document_get_document: (virtual get_document)
 * @document: a #GObject instance that implements AtkDocumentIface
 *
 * Gets a %gpointer that points to an instance of the DOM.  It is
 * up to the caller to check atk_document_get_type to determine
 * how to cast this pointer.
 *
 * Deprecated: Since 2.12. @document is already a representation of
 * the document. Use it directly, or one of its children, as an
 * instance of the DOM.
 *
 * Returns: (transfer none): a %gpointer that points to an instance of the DOM.
 **/
gpointer 
atk_document_get_document (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), NULL);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_document)
    {
      return (iface->get_document) (document);
    }
  else
    {
      return NULL;
    }
}

/**
 * atk_document_get_locale: (virtual get_document_locale)
 * @document: a #GObject instance that implements AtkDocumentIface
 *
 * Gets a UTF-8 string indicating the POSIX-style LC_MESSAGES locale
 *          of the content of this document instance.  Individual
 *          text substrings or images within this document may have
 *          a different locale, see atk_text_get_attributes and
 *          atk_image_get_image_locale.
 *
 * Deprecated: 2.7.90: Please use atk_object_get_object_locale() instead.
 *
 * Returns: a UTF-8 string indicating the POSIX-style LC_MESSAGES
 *          locale of the document content as a whole, or NULL if
 *          the document content does not specify a locale.
 **/
const gchar *
atk_document_get_locale (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), NULL);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_document_locale)
    {
      return (iface->get_document_locale) (document);
    }
  else
    {
      return NULL;
    }
}


/**
 * atk_document_get_attributes: (virtual get_document_attributes)
 * @document: a #GObject instance that implements AtkDocumentIface
 *
 * Gets an AtkAttributeSet which describes document-wide
 *          attributes as name-value pairs.
 *
 * Since: 1.12
 *
 * Returns: (transfer none): An AtkAttributeSet containing the explicitly
 *          set name-value-pair attributes associated with this document
 *          as a whole.
 **/
AtkAttributeSet *
atk_document_get_attributes (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), NULL);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_document_attributes)
    {
      return (iface->get_document_attributes) (document);
    }
  else
    {
      return NULL;
    }
}

/**
 * atk_document_get_attribute_value: (virtual get_document_attribute_value)
 * @document: a #GObject instance that implements AtkDocumentIface
 * @attribute_name: a character string representing the name of the attribute
 *            whose value is being queried.
 *
 * Since: 1.12
 *
 * Returns: (nullable): a string value associated with the named
 *    attribute for this document, or NULL if a value for
 *    #attribute_name has not been specified for this document.
 */
const gchar *
atk_document_get_attribute_value (AtkDocument *document, 
				  const gchar *attribute_name)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), NULL);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_document_attribute_value)
    {
      return (iface->get_document_attribute_value) (document, attribute_name);
    }
  else
    {
      return NULL;
    }
}

/**
 * atk_document_set_attribute_value: (virtual set_document_attribute)
 * @document: a #GObject instance that implements AtkDocumentIface
 * @attribute_name: a character string representing the name of the attribute
 *            whose value is being set.
 * @attribute_value: a string value to be associated with #attribute_name.
 *
 * Since: 1.12
 *
 * Returns: TRUE if #value is successfully associated with #attribute_name
 *          for this document, FALSE otherwise (e.g. if the document does not
 *          allow the attribute to be modified).
 */
gboolean
atk_document_set_attribute_value (AtkDocument *document, 
				  const gchar *attribute_name,
				  const gchar *attribute_value)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), FALSE);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->set_document_attribute)
    {
      return (iface->set_document_attribute) (document, attribute_name, attribute_value);
    }
  else
    {
      return FALSE;
    }
}

/**
 * atk_document_get_current_page_number:
 * @document: the #AtkDocument
 *
 * Since: 2.12
 *
 * Returns: current page number inside @document. -1 if not
 * implemented, not know by the implementor or irrelevant.
 */
gint
atk_document_get_current_page_number (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), FALSE);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_current_page_number)
    {
      return (iface->get_current_page_number) (document);
    }
  else
    {
      return -1;
    }
}

/**
 * atk_document_get_page_count:
 * @document: the #AtkDocument
 *
 * Since: 2.12
 *
 * Returns: total page count of @document. -1 if not implemented, not
 * know by the implementor or irrelevant.
 */
gint
atk_document_get_page_count (AtkDocument *document)
{
  AtkDocumentIface *iface;

  g_return_val_if_fail (ATK_IS_DOCUMENT (document), FALSE);

  iface = ATK_DOCUMENT_GET_IFACE (document);

  if (iface->get_page_count)
    {
      return (iface->get_page_count) (document);
    }
  else
    {
      return -1;
    }
}