atk.Object
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atk.Object

atk.Object — the base object class for the Accessibility Toolkit API.

Synopsis

class atk.Object(gobject.GObject):
    def get_name()
    def get_description()
    def get_parent()
    def get_n_accessible_children()
    def ref_accessible_child(i)
    def ref_relation_set()
    def get_role()
    def get_layer()
    def get_mdi_zorder()
    def ref_state_set()
    def get_index_in_parent()
    def set_name(name)
    def set_description(description)
    def set_parent(parent)
    def set_role(role)
    def remove_property_change_handler(handler_id)
    def add_relationship(relationship, target)
    def remove_relationship(relationship, target)

Ancestry

+-- gobject.GObject
  +-- atk.Object

atk.Object Properties

"accessible-component-layer"ReadThe accessible layer of this object. Allowed values: >= 0. Default value: 0.
"accessible-component-mdi-zorder"ReadThe accessible MDI value of this object. Default value: -2147483648
"accessible-description"Read-WriteDescription of an object, formatted for assistive technology access. Default value: None.
"accessible-hypertext-nlinks"ReadThe number of links which the current atk.Hypertext has. Allowed values: >= 0. Default value: 0.
"accessible-name"Read-WriteObject instance's name formatted for assistive technology access. Default value: None.
"accessible-parent"Read-WriteIs used to notify that the parent has changed.
"accessible-role"Read-WriteThe accessible role of this object. Allowed values: >= 0. Default value: 0.
"accessible-table-caption"Read-WriteIs used to notify that the table caption has changed; this property should not be used. "accessible-table-caption-object" should be used instead. Default value: None.
"accessible-table-caption-object"Read-WriteIs used to notify that the table caption has changed
"accessible-table-column-description"Read-WriteIs used to notify that the table column description has changed. Default value: None.
"accessible-table-column-header"Read-WriteIs used to notify that the table column header has changed
"accessible-table-row-description"Read-WriteIs used to notify that the table row description has changed. Default value: None.
"accessible-table-row-header"Read-WriteIs used to notify that the table row header has changed
"accessible-table-summary"Read-WriteIs used to notify that the table summary has changed
"accessible-value"Read-WriteIs used to notify that the value has changed. Allowed values: >= 0. Default value: 0.

atk.Object Signal Prototypes

gobject.GObject Signal Prototypes

"active-descendant-changed"

 def callback(atkobject, object, user_param1, ...)

"children-changed"

 def callback(atkobject, index, child, user_param1, ...)

"focus-event"

 def callback(atkobject, has_focus, user_param1, ...)

"property-change"

 def callback(atkobject, value, user_param1, ...)

"state-change"

 def callback(atkobject, state, is_set, user_param1, ...)

"visible-data-changed"

 def callback(atkobject, user_param1, ...)

Description

This class is the primary class for accessibility support via the Accessibility ToolKit (ATK). Objects that are instances of atk.Object (or instances of atk.Object-derived types) are queried for properties which relate basic (and generic) properties of a UI component such as name and description. Instances of atk.Object may also be queried as to whether they implement other ATK interfaces (e.g. atk.Action, atk.Component, etc.), as appropriate to the role which a given UI component plays in a user interface.

All UI components in an applicationthat provide useful information or services to the user must provide corresponding atk.Object instances on request (in GTK+, for instance, usually on a call to the gtk.Widget.get_accessible() method), either via ATK support built into the toolkit for the widget class or ancestor class, or in the case of custom widgets, if the inherited atk.Object implementation is insufficient, via instances of a new atk.Object subclass.

Methods

atk.Object.get_name

    def get_name()

Returns :

a character string representing the accessible name of the object.

Gets the accessible name of the accessible.

atk.Object.get_description

    def get_description()

Returns :

a character string representing the accessible description of the accessible.

Gets the accessible description of the accessible.

atk.Object.get_parent

    def get_parent()

Returns :

a atk.Object representing the accessible parent of the accessible

Gets the accessible parent of the accessible.

atk.Object.get_n_accessible_children

    def get_n_accessible_children()

Returns :

an integer representing the number of accessible children of the accessible.

Gets the number of accessible children of the accessible.

atk.Object.ref_accessible_child

    def ref_accessible_child(i)

i :

an integer representing the position of the child, starting from 0

Returns :

an atk.Object representing the specified accessible child of the accessible.

Gets a reference to the specified accessible child of the object. The accessible children are 0-based so the first accessible child is at index 0, the second at index 1 and so on.

atk.Object.ref_relation_set

    def ref_relation_set()

Returns :

an atk.RelationSet representing the relation set of the object.

Gets the atk.RelationSet associated with the object.

atk.Object.get_role

    def get_role()

Returns :

one of the Atk Role Constants which is the role of the accessible

Gets the role of the accessible.

atk.Object.get_layer

    def get_layer()

Returns :

one of the Atk Layer Constants which is the layer of the accessible

Note

This method is deprecated. Use the atk.Component.get_layer() method instead.

Gets the layer of the accessible.

atk.Object.get_mdi_zorder

    def get_mdi_zorder()

Returns :

an integer which is the zorder of the accessible, i.e. the depth at which the component is shown in relation to other components in the same container.

Note

This method is deprecated. Use the atk.Component.get_mdi_zorder() method instead.

Gets the zorder of the accessible. The value G_MININT will be returned if the layer of the accessible is not atk.LAYER_MDI.

atk.Object.ref_state_set

    def ref_state_set()

Returns :

a reference to an atk.StateSet which is the state set of the accessible

Gets a reference to the state set of the accessible.

atk.Object.get_index_in_parent

    def get_index_in_parent()

Returns :

an integer which is the index of the accessible in its parent

Gets the 0-based index of this accessible in its parent; returns -1 if the accessible does not have an accessible parent.

atk.Object.set_name

    def set_name(name)

name :

a character string to be set as the accessible name

Sets the accessible name of the accessible.

atk.Object.set_description

    def set_description(description)

description :

a character string to be set as the accessible description

Sets the accessible description of the accessible.

atk.Object.set_parent

    def set_parent(parent)

parent :

an atk.Object to be set as the accessible parent

Sets the accessible parent of the accessible.

atk.Object.set_role

    def set_role(role)

role :

one of the Atk Role Constants to be set as the role

Sets the role of the accessible.

atk.Object.remove_property_change_handler

    def remove_property_change_handler(handler_id)

handler_id :

an integer that identifies the handler to be removed.

Removes a property change handler.

atk.Object.add_relationship

    def add_relationship(relationship, target)

relationship :

one of the Atk Relation Type Constants

target :

The atk.Object which is to be the target of the relation.

Returns :

True if the relationship is added.

Adds a relationship of the specified type with the specified target.

atk.Object.remove_relationship

    def remove_relationship(relationship, target)

relationship :

one of the Atk Relation Type Constants

target :

The atk.Object which is the target of the relation to be removed.

Returns :

True if the relationship is removed.

Removes a relationship of the specified type with the specified target.

Signals

The "active-descendant-changed" atk.Object Signal

    def callback(atkobject, obj, user_param1, ...)

atkobject :

the object which received the signal.

obj :

the newly focused object.

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The "active-descendant-changed" signal is emitted by an object which has the state atk.STATE_MANAGES_DESCENDANTS when the focus object in the object changes. For instance, a table will emit the signal when the cell in the table which has focus changes.

The "children-changed" atk.Object Signal

    def callback(atkobject, index, child, user_param1, ...)

atkobject :

the object which received the signal.

index :

The index of the added or removed child

child :

The child which was added or removed

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The signal "children-changed" is emitted when a child is added or removed form an object. It supports two details: "add" and "remove"

The "focus-event" atk.Object Signal

    def callback(atkobject, has_focus, user_param1, ...)

atkobject :

the object which received the signal.

has_focus :

A boolean value which indicates whether the object gained or lost focus.

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The signal "focus-event" is emitted when an object gains or loses focus.

The "property-change" atk.Object Signal

    def callback(atkobject, value, user_param1, ...)

atkobject :

the object that received the signal.

value :

The new value of the property that changed.

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The signal "property-change" is emitted when an object's property value changes. The detail identifies the name of the property whose value has changed.

The "state-change" atk.Object Signal

    def callback(atkobject, state, is_set, user_param1, ...)

atkobject :

the object which received the signal.

state :

The name of the state which has changed

is_set :

A boolean which indicates whether the state has been set or unset.

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The "state-change" signal is emitted when an object's state changes. The detail value identifies the state type which has changed.

The "visible-data-changed" atk.Object Signal

    def callback(atkobject, user_param1, ...)

atkobject :

the object that received the signal.

user_param1 :

the first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)

The "visible-data-changed" signal is emitted when the visual appearance of the object changed.

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