AtkAction: ATK - Accessibility Toolkit

AtkAction

AtkAction — The ATK interface provided by UI components which the user can activate/interact with.

Functions

gboolean	atk_action_do_action ()
gint	atk_action_get_n_actions ()
const gchar *	atk_action_get_description ()
const gchar *	atk_action_get_name ()
const gchar *	atk_action_get_localized_name ()
const gchar *	atk_action_get_keybinding ()
gboolean	atk_action_set_description ()

Types and Values

	AtkAction
struct	AtkActionIface

Object Hierarchy

    GInterface
    ╰── AtkAction

Known Implementations

AtkAction is implemented by AtkHyperlink and AtkNoOpObject.

Includes

#include <atk/atk.h>

Description

AtkAction should be implemented by instances of AtkObject classes with which the user can interact directly, i.e. buttons, checkboxes, scrollbars, e.g. components which are not "passive" providers of UI information.

Exceptions: when the user interaction is already covered by another appropriate interface such as AtkEditableText (insert/delete text, etc.) or AtkValue (set value) then these actions should not be exposed by AtkAction as well.

Though most UI interactions on components should be invocable via keyboard as well as mouse, there will generally be a close mapping between "mouse actions" that are possible on a component and the AtkActions. Where mouse and keyboard actions are redundant in effect, AtkAction should expose only one action rather than exposing redundant actions if possible. By convention we have been using "mouse centric" terminology for AtkAction names.

Functions

atk_action_do_action ()

gboolean
atk_action_do_action (AtkAction *action,
                      gint i);

Perform the specified action on the object.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed

Returns

TRUE if success, FALSE otherwise

atk_action_get_n_actions ()

gint
atk_action_get_n_actions (AtkAction *action);

Gets the number of accessible actions available on the object. If there are more than one, the first one is considered the "default" action of the object.

Parameters

action

a GObject instance that implements AtkActionIface

Returns

a the number of actions, or 0 if action does not implement this interface.

atk_action_get_description ()

const gchar *
atk_action_get_description (AtkAction *action,
                            gint i);

Returns a description of the specified action of the object.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed

Returns

a description string, or NULL if action does not implement this interface.

[nullable]

atk_action_get_name ()

const gchar *
atk_action_get_name (AtkAction *action,
                     gint i);

Returns a non-localized string naming the specified action of the object. This name is generally not descriptive of the end result of the action, but instead names the 'interaction type' which the object supports. By convention, the above strings should be used to represent the actions which correspond to the common point-and-click interaction techniques of the same name: i.e. "click", "press", "release", "drag", "drop", "popup", etc. The "popup" action should be used to pop up a context menu for the object, if one exists.

For technical reasons, some toolkits cannot guarantee that the reported action is actually 'bound' to a nontrivial user event; i.e. the result of some actions via atk_action_do_action() may be NIL.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed

Returns

a name string, or NULL if action does not implement this interface.

[nullable]

atk_action_get_localized_name ()

const gchar *
atk_action_get_localized_name (AtkAction *action,
                               gint i);

Returns the localized name of the specified action of the object.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed

Returns

a name string, or NULL if action does not implement this interface.

[nullable]

atk_action_get_keybinding ()

const gchar *
atk_action_get_keybinding (AtkAction *action,
                           gint i);

Gets the keybinding which can be used to activate this action, if one exists. The string returned should contain localized, human-readable, key sequences as they would appear when displayed on screen. It must be in the format "mnemonic;sequence;shortcut".

The mnemonic key activates the object if it is presently enabled onscreen. This typically corresponds to the underlined letter within the widget. Example: "n" in a traditional "New..." menu item or the "a" in "Apply" for a button.
The sequence is the full list of keys which invoke the action even if the relevant element is not currently shown on screen. For instance, for a menu item the sequence is the keybindings used to open the parent menus before invoking. The sequence string is colon-delimited. Example: "Alt+F:N" in a traditional "New..." menu item.
The shortcut, if it exists, will invoke the same action without showing the component or its enclosing menus or dialogs. Example: "Ctrl+N" in a traditional "New..." menu item.

Example: For a traditional "New..." menu item, the expected return value would be: "N;Alt+F:N;Ctrl+N" for the English locale and "N;Alt+D:N;Strg+N" for the German locale. If, hypothetically, this menu item lacked a mnemonic, it would be represented by ";;Ctrl+N" and ";;Strg+N" respectively.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed

Returns

the keybinding which can be used to activate this action, or NULL if there is no keybinding for this action.

[nullable]

atk_action_set_description ()

gboolean
atk_action_set_description (AtkAction *action,
                            gint i,
                            const gchar *desc);

Sets a description of the specified action of the object.

Parameters

action	a GObject instance that implements AtkActionIface
i	the action index corresponding to the action to be performed
desc	the description to be assigned to this action

Returns

a gboolean representing if the description was successfully set;

Types and Values

AtkAction

typedef struct _AtkAction AtkAction;

struct AtkActionIface

struct AtkActionIface {
  gboolean                (*do_action)         (AtkAction         *action,
                                                gint              i);
  gint                    (*get_n_actions)     (AtkAction         *action);
  const gchar*            (*get_description)   (AtkAction         *action,
                                                gint              i);
  const gchar*            (*get_name)          (AtkAction         *action,
                                                gint              i);
  const gchar*            (*get_keybinding)    (AtkAction         *action,
                                                gint              i);
  gboolean                (*set_description)   (AtkAction         *action,
                                                gint              i,
                                                const gchar       *desc);
  const gchar*            (*get_localized_name)(AtkAction         *action,
						gint              i);
};

The AtkAction interface should be supported by any object that can perform one or more actions. The interface provides the standard mechanism for an assistive technology to determine what those actions are as well as tell the object to perform them. Any object that can be manipulated should support this interface.