// Generated by gmmproc 2.82.0 -- DO NOT MODIFY!
#ifndef _GTKMM_ACCESSIBLE_H
#define _GTKMM_ACCESSIBLE_H

#include <gtkmmconfig.h>


#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>

/* Copyright (C) 2020 The gtkmm Development Team
 *
 * 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 2.1 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, see <http://www.gnu.org/licenses/>.
 */


#include <glibmm/interface.h>
#include <glibmm/value.h>


#ifndef DOXYGEN_SHOULD_SKIP_THIS
extern "C"
{
typedef struct _GtkAccessibleInterface GtkAccessibleInterface;
}
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

#ifndef DOXYGEN_SHOULD_SKIP_THIS
using GtkAccessible = struct _GtkAccessible;
using GtkAccessibleClass = struct _GtkAccessibleClass;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Gtk
{ class GTKMM_API Accessible_Class; } // namespace Gtk
#endif // DOXYGEN_SHOULD_SKIP_THIS

namespace Gtk
{
class ATContext;

/** %Accessible interface.
 *
 * %Gtk::Accessible provides an interface for describing a UI element, like a
 * Gtk::Widget, in a way that can be consumed by Assistive Technologies, or
 * “AT”. Every accessible implementation has:
 *
 *  - a “role”, represented by a value of the Gtk::Accessible::Role enumeration
 *  - an “attribute”, represented by a set of Gtk::Accessible::State,
 *    Gtk::Accessible::Property and Gtk::Accessible::Relation values
 *
 * The role cannot be changed after instantiating a %Gtk::Accessible
 * implementation.
 *
 * The attributes are updated every time a UI element's state changes in a way that
 * should be reflected by assistive technologies. For instance, if a Gtk::Widget
 * visibility changes, the Gtk::Accessible::State::HIDDEN state will also change
 * to reflect Gtk::Widget::property_visible().
 *
 * @newin{3,98}
 */

class GTKMM_API Accessible : public Glib::Interface
{
  
#ifndef DOXYGEN_SHOULD_SKIP_THIS

public:
  using CppObjectType = Accessible;
  using CppClassType = Accessible_Class;
  using BaseObjectType = GtkAccessible;
  using BaseClassType = GtkAccessibleInterface;

  // noncopyable
  Accessible(const Accessible&) = delete;
  Accessible& operator=(const Accessible&) = delete;

private:
  friend class Accessible_Class;
  static CppClassType accessible_class_;

#endif /* DOXYGEN_SHOULD_SKIP_THIS */
protected:
  /**
   * You should derive from this class to use it.
   */
  Accessible();

#ifndef DOXYGEN_SHOULD_SKIP_THIS
  /** Called by constructors of derived classes. Provide the result of
   * the Class init() function to ensure that it is properly
   * initialized.
   *
   * @param interface_class The Class object for the derived type.
   */
  explicit Accessible(const Glib::Interface_Class& interface_class);

public:
  // This is public so that C++ wrapper instances can be
  // created for C instances of unwrapped types.
  // For instance, if an unexpected C type implements the C interface.
  explicit Accessible(GtkAccessible* castitem);

protected:
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

public:

  Accessible(Accessible&& src) noexcept;
  Accessible& operator=(Accessible&& src) noexcept;

  ~Accessible() noexcept override;

  static void add_interface(GType gtype_implementer);

  /** Get the GType for this class, for use with the underlying GObject type system.
   */
  static GType get_type()      G_GNUC_CONST;

#ifndef DOXYGEN_SHOULD_SKIP_THIS
  static GType get_base_type() G_GNUC_CONST;
#endif

  ///Provides access to the underlying C GObject.
  GtkAccessible*       gobj()       { return reinterpret_cast<GtkAccessible*>(gobject_); }

  ///Provides access to the underlying C GObject.
  const GtkAccessible* gobj() const { return reinterpret_cast<GtkAccessible*>(gobject_); }

private:


public:
  /** @addtogroup gtkmmEnums gtkmm Enums and Flags */

  /** 
   *  @var Role::ALERT
   * An element with important, and usually
   * time-sensitive, information.
   * 
   *  @var Role::ALERT_DIALOG
   * A type of dialog that contains an
   * alert message.
   * 
   *  @var Role::BANNER
   * Unused.
   * 
   *  @var Role::BUTTON
   * An input element that allows for
   * user-triggered actions when clicked or pressed.
   * 
   *  @var Role::CAPTION
   * Unused.
   * 
   *  @var Role::CELL
   * Unused.
   * 
   *  @var Role::CHECKBOX
   * A checkable input element that has
   * three possible values: `true`, `false`, or `mixed`.
   * 
   *  @var Role::COLUMN_HEADER
   * A header in a columned list.
   * 
   *  @var Role::COMBO_BOX
   * An input that controls another element,
   * such as a list or a grid, that can dynamically pop up to help the user
   * set the value of the input.
   * 
   *  @var Role::COMMAND
   * Abstract role.
   * 
   *  @var Role::COMPOSITE
   * Abstract role.
   * 
   *  @var Role::DIALOG
   * A dialog is a window that is designed to interrupt
   * the current processing of an application in order to prompt the user to enter
   * information or require a response.
   * 
   *  @var Role::DOCUMENT
   * Content that assistive technology users may want to
   * browse in a reading mode.
   * 
   *  @var Role::FEED
   * Unused.
   * 
   *  @var Role::FORM
   * Unused.
   * 
   *  @var Role::GENERIC
   * A nameless container that has no semantic meaning
   * of its own. This is the role that GTK uses by default for widgets.
   * 
   *  @var Role::GRID
   * A grid of items.
   * 
   *  @var Role::GRID_CELL
   * An item in a grid or tree grid.
   * 
   *  @var Role::GROUP
   * An element that groups multiple related widgets. GTK uses
   * this role for various containers, like Gtk::HeaderBar or Gtk::Notebook.
   * 
   *  @var Role::HEADING
   * Unused.
   * 
   *  @var Role::IMG
   * An image.
   * 
   *  @var Role::INPUT
   * Abstract role.
   * 
   *  @var Role::LABEL
   * A visible name or caption for a user interface component.
   * 
   *  @var Role::LANDMARK
   * Abstract role.
   * 
   *  @var Role::LEGEND
   * Unused.
   * 
   *  @var Role::LINK
   * A clickable link.
   * 
   *  @var Role::LIST
   * A list of items.
   * 
   *  @var Role::LIST_BOX
   * Unused.
   * 
   *  @var Role::LIST_ITEM
   * An item in a list.
   * 
   *  @var Role::LOG
   * Unused.
   * 
   *  @var Role::MAIN
   * Unused.
   * 
   *  @var Role::MARQUEE
   * Unused.
   * 
   *  @var Role::MATH
   * Unused.
   * 
   *  @var Role::METER
   * An element that represents a value within a known range.
   * 
   *  @var Role::MENU
   * A menu.
   * 
   *  @var Role::MENU_BAR
   * A menubar.
   * 
   *  @var Role::MENU_ITEM
   * An item in a menu.
   * 
   *  @var Role::MENU_ITEM_CHECKBOX
   * A check item in a menu.
   * 
   *  @var Role::MENU_ITEM_RADIO
   * A radio item in a menu.
   * 
   *  @var Role::NAVIGATION
   * Unused.
   * 
   *  @var Role::NONE
   * An element that is not represented to accessibility technologies.
   * This role is synonymous to @a GTK_ACCESSIBLE_ROLE_PRESENTATION.
   * 
   *  @var Role::NOTE
   * Unused.
   * 
   *  @var Role::OPTION
   * Unused.
   * 
   *  @var Role::PRESENTATION
   * An element that is not represented to accessibility technologies.
   * This role is synonymous to @a GTK_ACCESSIBLE_ROLE_NONE.
   * 
   *  @var Role::PROGRESS_BAR
   * An element that displays the progress
   * status for tasks that take a long time.
   * 
   *  @var Role::RADIO
   * A checkable input in a group of radio roles,
   * only one of which can be checked at a time.
   * 
   *  @var Role::RADIO_GROUP
   * Unused.
   * 
   *  @var Role::RANGE
   * Abstract role.
   * 
   *  @var Role::REGION
   * Unused.
   * 
   *  @var Role::ROW
   * A row in a columned list.
   * 
   *  @var Role::ROW_GROUP
   * Unused.
   * 
   *  @var Role::ROW_HEADER
   * Unused.
   * 
   *  @var Role::SCROLLBAR
   * A graphical object that controls the scrolling
   * of content within a viewing area, regardless of whether the content is fully
   * displayed within the viewing area.
   * 
   *  @var Role::SEARCH
   * Unused.
   * 
   *  @var Role::SEARCH_BOX
   * A type of textbox intended for specifying
   * search criteria.
   * 
   *  @var Role::SECTION
   * Abstract role.
   * 
   *  @var Role::SECTION_HEAD
   * Abstract role.
   * 
   *  @var Role::SELECT
   * Abstract role.
   * 
   *  @var Role::SEPARATOR
   * A divider that separates and distinguishes
   * sections of content or groups of menuitems.
   * 
   *  @var Role::SLIDER
   * A user input where the user selects a value
   * from within a given range.
   * 
   *  @var Role::SPIN_BUTTON
   * A form of range that expects the user to
   * select from among discrete choices.
   * 
   *  @var Role::STATUS
   * Unused.
   * 
   *  @var Role::STRUCTURE
   * Abstract role.
   * 
   *  @var Role::SWITCH
   * A type of checkbox that represents on/off values,
   * as opposed to checked/unchecked values.
   * 
   *  @var Role::TAB
   * An item in a list of tab used for switching pages.
   * 
   *  @var Role::TABLE
   * Unused.
   * 
   *  @var Role::TAB_LIST
   * A list of tabs for switching pages.
   * 
   *  @var Role::TAB_PANEL
   * A page in a notebook or stack.
   * 
   *  @var Role::TEXT_BOX
   * A type of input that allows free-form text
   * as its value.
   * 
   *  @var Role::TIME
   * Unused.
   * 
   *  @var Role::TIMER
   * Unused.
   * 
   *  @var Role::TOOLBAR
   * Unused.
   * 
   *  @var Role::TOOLTIP
   * Unused.
   * 
   *  @var Role::TREE
   * Unused.
   * 
   *  @var Role::TREE_GRID
   * A treeview-like, columned list.
   * 
   *  @var Role::TREE_ITEM
   * Unused.
   * 
   *  @var Role::WIDGET
   * Abstract role for interactive components of a
   * graphical user interface.
   * 
   *  @var Role::WINDOW
   * Abstract role for windows.
   */
   /** The accessible role for a Gtk::Accessible implementation.
   * 
   * Abstract roles are only used as part of the ontology; application
   * developers must not use abstract roles in their code.
   *
   * @ingroup gtkmmEnums
   */
  enum class Role
  {
    ALERT,
    ALERT_DIALOG,
    BANNER,
    BUTTON,
    CAPTION,
    CELL,
    CHECKBOX,
    COLUMN_HEADER,
    COMBO_BOX,
    COMMAND,
    COMPOSITE,
    DIALOG,
    DOCUMENT,
    FEED,
    FORM,
    GENERIC,
    GRID,
    GRID_CELL,
    GROUP,
    HEADING,
    IMG,
    INPUT,
    LABEL,
    LANDMARK,
    LEGEND,
    LINK,
    LIST,
    LIST_BOX,
    LIST_ITEM,
    LOG,
    MAIN,
    MARQUEE,
    MATH,
    METER,
    MENU,
    MENU_BAR,
    MENU_ITEM,
    MENU_ITEM_CHECKBOX,
    MENU_ITEM_RADIO,
    NAVIGATION,
    NONE,
    NOTE,
    OPTION,
    PRESENTATION,
    PROGRESS_BAR,
    RADIO,
    RADIO_GROUP,
    RANGE,
    REGION,
    ROW,
    ROW_GROUP,
    ROW_HEADER,
    SCROLLBAR,
    SEARCH,
    SEARCH_BOX,
    SECTION,
    SECTION_HEAD,
    SELECT,
    SEPARATOR,
    SLIDER,
    SPIN_BUTTON,
    STATUS,
    STRUCTURE,
    SWITCH,
    TAB,
    TABLE,
    TAB_LIST,
    TAB_PANEL,
    TEXT_BOX,
    TIME,
    TIMER,
    TOOLBAR,
    TOOLTIP,
    TREE,
    TREE_GRID,
    TREE_ITEM,
    WIDGET,
    WINDOW,
    TOGGLE_BUTTON,
    APPLICATION,
    PARAGRAPH,
    BLOCK_QUOTE,
    ARTICLE,
    COMMENT,
    TERMINAL
  };


  /** 
   *  @var State::BUSY
   * A “busy” state. This state has boolean values.
   * 
   *  @var State::CHECKED
   * A “checked” state; indicates the current
   * state of a Gtk::CheckButton. Value type: Gtk::AccessibleTristate.
   * 
   *  @var State::DISABLED
   * A “disabled” state; corresponds to the
   * Gtk::Widget::property_sensitive() property. It indicates a UI element
   * that is perceivable, but not editable or operable. Value type: boolean.
   * 
   *  @var State::EXPANDED
   * An “expanded” state; corresponds to the
   * Gtk::Expander::property_expanded() property. Value type: boolean
   * or undefined.
   * 
   *  @var State::HIDDEN
   * A “hidden” state; corresponds to the
   * Gtk::Widget::property_visible() property. You can use this state
   * explicitly on UI elements that should not be exposed to an assistive
   * technology. Value type: boolean
   * See also: Gtk::Accessible::State::DISABLED.
   * 
   *  @var State::INVALID
   * An “invalid” state; set when a widget
   * is showing an error. Value type: Gtk::AccessibleInvalidState.
   * 
   *  @var State::PRESSED
   * A “pressed” state; indicates the current
   * state of a Gtk::ToggleButton. Value type: Gtk::AccessibleTristate
   * enumeration.
   * 
   *  @var State::SELECTED
   * A “selected” state; set when a widget
   * is selected. Value type: boolean or undefined.
   */
   /** The possible accessible states of a Gtk::Accessible.
   *
   * @ingroup gtkmmEnums
   */
  enum class State
  {
    BUSY,
    CHECKED,
    DISABLED,
    EXPANDED,
    HIDDEN,
    INVALID,
    PRESSED,
    SELECTED,
    VISITED
  };


  /** 
   *  @var Property::AUTOCOMPLETE
   * Indicates whether inputting text
   * could trigger display of one or more predictions of the user's intended
   * value for a combobox, searchbox, or textbox and specifies how predictions
   * would be presented if they were made. Value type: Gtk::AccessibleAutocomplete.
   * 
   *  @var Property::DESCRIPTION
   * Defines a string value that describes
   * or annotates the current element. Value type: string.
   * 
   *  @var Property::HAS_POPUP
   * Indicates the availability and type of
   * interactive popup element, such as menu or dialog, that can be triggered
   * by an element.
   * 
   *  @var Property::KEY_SHORTCUTS
   * Indicates keyboard shortcuts that an
   * author has implemented to activate or give focus to an element. Value type:
   * string.
   * 
   *  @var Property::LABEL
   * Defines a string value that labels the current
   * element. Value type: string.
   * 
   *  @var Property::LEVEL
   * Defines the hierarchical level of an element
   * within a structure. Value type: integer.
   * 
   *  @var Property::MODAL
   * Indicates whether an element is modal when
   * displayed. Value type: boolean.
   * 
   *  @var Property::MULTI_LINE
   * Indicates whether a text box accepts
   * multiple lines of input or only a single line. Value type: boolean.
   * 
   *  @var Property::MULTI_SELECTABLE
   * Indicates that the user may select
   * more than one item from the current selectable descendants. Value type:
   * boolean.
   * 
   *  @var Property::ORIENTATION
   * Indicates whether the element's
   * orientation is horizontal, vertical, or unknown/ambiguous. Value type:
   * Gtk::Orientation.
   * 
   *  @var Property::PLACEHOLDER
   * Defines a short hint (a word or short
   * phrase) intended to aid the user with data entry when the control has no
   * value. A hint could be a sample value or a brief description of the expected
   * format. Value type: string.
   * 
   *  @var Property::READ_ONLY
   * Indicates that the element is not editable,
   * but is otherwise operable. Value type: boolean.
   * 
   *  @var Property::REQUIRED
   * Indicates that user input is required on
   * the element before a form may be submitted. Value type: boolean.
   * 
   *  @var Property::ROLE_DESCRIPTION
   * Defines a human-readable,
   * author-localized description for the role of an element. Value type: string.
   * 
   *  @var Property::SORT
   * Indicates if items in a table or grid are
   * sorted in ascending or descending order. Value type: Gtk::AccessibleSort.
   * 
   *  @var Property::VALUE_MAX
   * Defines the maximum allowed value for a
   * range widget. Value type: double.
   * 
   *  @var Property::VALUE_MIN
   * Defines the minimum allowed value for a
   * range widget. Value type: double.
   * 
   *  @var Property::VALUE_NOW
   * Defines the current value for a range widget.
   * Value type: double.
   * 
   *  @var Property::VALUE_TEXT
   * Defines the human readable text alternative
   * of aria-valuenow for a range widget. Value type: string.
   */
   /** The possible accessible properties of a Gtk::Accessible.
   *
   * @ingroup gtkmmEnums
   */
  enum class Property
  {
    AUTOCOMPLETE,
    DESCRIPTION,
    HAS_POPUP,
    KEY_SHORTCUTS,
    LABEL,
    LEVEL,
    MODAL,
    MULTI_LINE,
    MULTI_SELECTABLE,
    ORIENTATION,
    PLACEHOLDER,
    READ_ONLY,
    REQUIRED,
    ROLE_DESCRIPTION,
    SORT,
    VALUE_MAX,
    VALUE_MIN,
    VALUE_NOW,
    VALUE_TEXT,
    HELP_TEXT
  };


  /** 
   *  @var Relation::ACTIVE_DESCENDANT
   * Identifies the currently active
   * element when focus is on a composite widget, combobox, textbox, group,
   * or application. Value type: reference.
   * 
   *  @var Relation::COL_COUNT
   * Defines the total number of columns
   * in a table, grid, or treegrid. Value type: integer.
   * 
   *  @var Relation::COL_INDEX
   * Defines an element's column index or
   * position with respect to the total number of columns within a table,
   * grid, or treegrid. Value type: integer.
   * 
   *  @var Relation::COL_INDEX_TEXT
   * Defines a human readable text
   * alternative of Gtk::Accessible::Relation::COL_INDEX. Value type: string.
   * 
   *  @var Relation::COL_SPAN
   * Defines the number of columns spanned
   * by a cell or gridcell within a table, grid, or treegrid. Value type: integer.
   * 
   *  @var Relation::CONTROLS
   * Identifies the element (or elements) whose
   * contents or presence are controlled by the current element. Value type: reference.
   * 
   *  @var Relation::DESCRIBED_BY
   * Identifies the element (or elements)
   * that describes the object. Value type: reference.
   * 
   *  @var Relation::DETAILS
   * Identifies the element (or elements) that
   * provide additional information related to the object. Value type: reference.
   * 
   *  @var Relation::ERROR_MESSAGE
   * Identifies the element (or elements) that
   * provide an error message for an object. Value type: reference.
   * 
   *  @var Relation::FLOW_TO
   * Identifies the next element (or elements)
   * in an alternate reading order of content which, at the user's discretion,
   * allows assistive technology to override the general default of reading in
   * document source order. Value type: reference.
   * 
   *  @var Relation::LABELLED_BY
   * Identifies the element (or elements)
   * that labels the current element. Value type: reference.
   * 
   *  @var Relation::OWNS
   * Identifies an element (or elements) in order
   * to define a visual, functional, or contextual parent/child relationship
   * between elements where the widget hierarchy cannot be used to represent
   * the relationship. Value type: reference.
   * 
   *  @var Relation::POS_IN_SET
   * Defines an element's number or position
   * in the current set of listitems or treeitems. Value type: integer.
   * 
   *  @var Relation::ROW_COUNT
   * Defines the total number of rows in a table,
   * grid, or treegrid. Value type: integer.
   * 
   *  @var Relation::ROW_INDEX
   * Defines an element's row index or position
   * with respect to the total number of rows within a table, grid, or treegrid.
   * Value type: integer.
   * 
   *  @var Relation::ROW_INDEX_TEXT
   * Defines a human readable text
   * alternative of aria-rowindex. Value type: string.
   * 
   *  @var Relation::ROW_SPAN
   * Defines the number of rows spanned by a
   * cell or gridcell within a table, grid, or treegrid. Value type: integer.
   * 
   *  @var Relation::SET_SIZE
   * Defines the number of items in the current
   * set of listitems or treeitems. Value type: integer.
   */
   /** The possible accessible relations of a Gtk::Accessible.
   * 
   * Accessible relations can be references to other widgets,
   * integers or strings.
   *
   * @ingroup gtkmmEnums
   */
  enum class Relation
  {
    ACTIVE_DESCENDANT,
    COL_COUNT,
    COL_INDEX,
    COL_INDEX_TEXT,
    COL_SPAN,
    CONTROLS,
    DESCRIBED_BY,
    DETAILS,
    ERROR_MESSAGE,
    FLOW_TO,
    LABELLED_BY,
    OWNS,
    POS_IN_SET,
    ROW_COUNT,
    ROW_INDEX,
    ROW_INDEX_TEXT,
    ROW_SPAN,
    SET_SIZE
  };


  /** 
   *  @var PlatformState::FOCUSABLE
   * Whether the accessible can be focused.
   * 
   *  @var PlatformState::FOCUSED
   * Whether the accessible has focus.
   * 
   *  @var PlatformState::ACTIVE
   * Whether the accessible is active.
   */
   /** The various platform states which can be queried
   * using Gtk::Accessible::get_platform_state().
   * 
   * @newin{4,10}
   *
   * @ingroup gtkmmEnums
   */
  enum class PlatformState
  {
    FOCUSABLE,
    FOCUSED,
    ACTIVE
  };


  /** 
   *  @var AnnouncementPriority::LOW
   * The announcement is low priority,
   * and might be read only on the user's request.
   * 
   *  @var AnnouncementPriority::MEDIUM
   * The announcement is of medium
   * priority, and is usually spoken at the next opportunity, such as at the
   * end of speaking the current sentence or when the user pauses typing.
   * 
   *  @var AnnouncementPriority::HIGH
   * The announcement is of high
   * priority, and is usually spoken immediately. Because an interruption
   * might disorient users or cause them to not complete their current task,
   * authors SHOULD NOT use high priority announcements unless the
   * interruption is imperative. An example would be a notification about a
   * critical battery power level.
   */
   /** The priority of an accessibility announcement.
   * 
   * @newin{4,14}
   *
   * @ingroup gtkmmEnums
   */
  enum class AnnouncementPriority
  {
    LOW,
    MEDIUM,
    HIGH
  };


  /** Retrieves the accessible implementation for the given `Gtk::Accessible`.
   * 
   * @newin{4,10}
   * 
   * @return The accessible implementation object.
   */
  Glib::RefPtr<ATContext> get_at_context();
  
  /** Retrieves the accessible implementation for the given `Gtk::Accessible`.
   * 
   * @newin{4,10}
   * 
   * @return The accessible implementation object.
   */
  Glib::RefPtr<const ATContext> get_at_context() const;

  
  /** Query a platform state, such as focus.
   * 
   * See gtk_accessible_platform_changed().
   * 
   * This functionality can be overridden by `Gtk::Accessible`
   * implementations, e.g. to get platform state from an ignored
   * child widget, as is the case for `Gtk::Text` wrappers.
   * 
   * @newin{4,10}
   * 
   * @param state Platform state to query.
   * @return The value of @a state for the accessible.
   */
  bool get_platform_state(PlatformState state) const;
  
  /** Retrieves the accessible parent for an accessible object.
   * 
   * This function returns <tt>nullptr</tt> for top level widgets.
   * 
   * @newin{4,10}
   * 
   * @return The accessible parent.
   */
  Glib::RefPtr<Accessible> get_accessible_parent();
  
  /** Retrieves the accessible parent for an accessible object.
   * 
   * This function returns <tt>nullptr</tt> for top level widgets.
   * 
   * @newin{4,10}
   * 
   * @return The accessible parent.
   */
  Glib::RefPtr<const Accessible> get_accessible_parent() const;
  
  /** Sets the parent and sibling of an accessible object.
   * 
   * This function is meant to be used by accessible implementations that are
   * not part of the widget hierarchy, and but act as a logical bridge between
   * widgets. For instance, if a widget creates an object that holds metadata
   * for each child, and you want that object to implement the `Gtk::Accessible`
   * interface, you will use this function to ensure that the parent of each
   * child widget is the metadata object, and the parent of each metadata
   * object is the container widget.
   * 
   * @newin{4,10}
   * 
   * @param parent The parent accessible object.
   * @param next_sibling The sibling accessible object.
   */
  void set_accessible_parent(const Glib::RefPtr<Accessible>& parent, const Glib::RefPtr<Accessible>& next_sibling);

  
  /** Retrieves the first accessible child of an accessible object.
   * 
   * since: 4.10
   * 
   * @return The first accessible child.
   */
  Glib::RefPtr<Accessible> get_first_accessible_child();
  
  /** Retrieves the first accessible child of an accessible object.
   * 
   * since: 4.10
   * 
   * @return The first accessible child.
   */
  Glib::RefPtr<const Accessible> get_first_accessible_child() const;

  
  /** Retrieves the next accessible sibling of an accessible object
   * 
   * since: 4.10
   * 
   * @return The next accessible sibling.
   */
  Glib::RefPtr<Accessible> get_next_accessible_sibling();
  
  /** Retrieves the next accessible sibling of an accessible object
   * 
   * since: 4.10
   * 
   * @return The next accessible sibling.
   */
  Glib::RefPtr<const Accessible> get_next_accessible_sibling() const;
  
  /** Updates the next accessible sibling of @a self.
   * 
   * That might be useful when a new child of a custom `Gtk::Accessible`
   * is created, and it needs to be linked to a previous child.
   * 
   * @newin{4,10}
   * 
   * @param new_sibling The new next accessible sibling to set.
   */
  void update_next_accessible_sibling(const Glib::RefPtr<Accessible>& new_sibling);

  
  /** Queries the coordinates and dimensions of this accessible
   * 
   * This functionality can be overridden by `Gtk::Accessible`
   * implementations, e.g.\ to get the bounds from an ignored
   * child widget.
   * 
   * @newin{4,10}
   * 
   * @param x The x coordinate of the top left corner of the accessible.
   * @param y The y coordinate of the top left corner of the widget.
   * @param width The width of the accessible object.
   * @param height The height of the accessible object.
   * @return True if the bounds are valid, and false otherwise.
   */
  bool get_bounds(int& x, int& y, int& width, int& height) const;
  
  /** Retrieves the accessible role of an accessible object.
   * 
   * @return The accessible role.
   */
  Role get_accessible_role() const;

  
  /** Updates an accessible state.
   *
   * This function should be called by Gtk::Widget types whenever an accessible
   * state change must be communicated to assistive technologies.
   *
   * @param state A Gtk::Accessible::State.
   * @param value A Glib::ValueBase.
   */
  void update_state(State state, const Glib::ValueBase& value);

  /** Updates an accessible property.
   *
   * This function should be called by Gtk::Widget types whenever an accessible
   * property change must be communicated to assistive technologies.
   *
   * @param property A Gtk::Accessible::Property.
   * @param value A Glib::ValueBase.
   */
  void update_property(Property property, const Glib::ValueBase& value);

  /** Updates an accessible relation.
   *
   * This function should be called by Gtk::Widget types whenever an accessible
   * relation change must be communicated to assistive technologies.
   *
   * @param relation A Gtk::Accessible::Relation.
   * @param value A Glib::ValueBase.
   */
  void update_relation(Relation relation, const Glib::ValueBase& value);

  
  /** Resets the accessible @a state to its default value.
   * 
   * @param state A `Gtk::Accessible::State`.
   */
  void reset_state(State state);
  
  /** Resets the accessible @a property to its default value.
   * 
   * @param property A `Gtk::Accessible::Property`.
   */
  void reset_property(Property property);
  
  /** Resets the accessible @a relation to its default value.
   * 
   * @param relation A `Gtk::Accessible::Relation`.
   */
  void reset_relation(Relation relation);

  
  /** Requests the user's screen reader to announce the given message.
   * 
   * This kind of notification is useful for messages that
   * either have only a visual representation or that are not
   * exposed visually at all, e.g. a notification about a
   * successful operation.
   * 
   * Also, by using this API, you can ensure that the message
   * does not interrupts the user's current screen reader output.
   * 
   * @newin{4,14}
   * 
   * @param message The string to announce.
   * @param priority The priority of the announcement.
   */
  void announce(const Glib::ustring& message, AnnouncementPriority priority);

  /** The accessible role of the given `Gtk::Accessible` implementation.
   * 
   * The accessible role cannot be changed once set.
   *
   * Default value: Gtk::Accessible::Role::NONE
   *
   * @return A PropertyProxy that allows you to get or set the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy< Role > property_accessible_role() ;

/** The accessible role of the given `Gtk::Accessible` implementation.
   * 
   * The accessible role cannot be changed once set.
   *
   * Default value: Gtk::Accessible::Role::NONE
   *
   * @return A PropertyProxy_ReadOnly that allows you to get the value of the property,
   * or receive notification when the value of the property changes.
   */
  Glib::PropertyProxy_ReadOnly< Role > property_accessible_role() const;


  //TODO: Add vfuncs, when we can break ABI


public:

public:
  //C++ methods used to invoke GTK+ virtual functions:

protected:
  //GTK+ Virtual Functions (override these to change behaviour):

  //Default Signal Handlers::


};

} // namespace Gtk


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::Role> : public Glib::Value_Enum<Gtk::Accessible::Role>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::State> : public Glib::Value_Enum<Gtk::Accessible::State>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::Property> : public Glib::Value_Enum<Gtk::Accessible::Property>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::Relation> : public Glib::Value_Enum<Gtk::Accessible::Relation>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::PlatformState> : public Glib::Value_Enum<Gtk::Accessible::PlatformState>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{

template <>
class GTKMM_API Value<Gtk::Accessible::AnnouncementPriority> : public Glib::Value_Enum<Gtk::Accessible::AnnouncementPriority>
{
public:
  static GType value_type() G_GNUC_CONST;
};

} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


namespace Glib
{
  /** A Glib::wrap() method for this object.
   *
   * @param object The C instance.
   * @param take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
   * @result A C++ instance that wraps this C instance.
   *
   * @relates Gtk::Accessible
   */
  GTKMM_API
  Glib::RefPtr<Gtk::Accessible> wrap(GtkAccessible* object, bool take_copy = false);

} // namespace Glib


#endif /* _GTKMM_ACCESSIBLE_H */