Class Accessible

java.lang.Object

org.eclipse.swt.accessibility.Accessible

public class Accessible
extends Object

Instances of this class provide a bridge between application code and assistive technology clients. Many platforms provide default accessible behavior for most widgets, and this class allows that default behavior to be overridden. Applications can get the default Accessible object for a control by sending it getAccessible, and then add an accessible listener to override simple items like the name and help string, or they can add an accessible control listener to override complex items. As a rule of thumb, an application would only want to use the accessible control listener to implement accessibility for a custom control.

Since:

1.4

See Also:

• Control.getAccessible()
• AccessibleListener
• AccessibleEvent
• AccessibleControlListener
• AccessibleControlEvent
• Accessibility snippets
• Sample code and further information

Constructor Summary

Constructors

Constructor	Description
Accessible(Accessible parent)	Constructs a new instance of this class given its parent.

Method Summary

Modifier and Type	Method	Description
void	addAccessibleActionListener(AccessibleActionListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAction interface.
void	addAccessibleAttributeListener(AccessibleAttributeListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAttribute interface.
void	addAccessibleControlListener(AccessibleControlListener listener)	Adds the listener to the collection of listeners who will be notified when an accessible client asks for custom control specific information.
void	addAccessibleEditableTextListener(AccessibleEditableTextListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleEditableText interface.
void	addAccessibleHyperlinkListener(AccessibleHyperlinkListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleHyperlink interface.
void	addAccessibleListener(AccessibleListener listener)	Adds the listener to the collection of listeners who will be notified when an accessible client asks for certain strings, such as name, description, help, or keyboard shortcut.
void	addAccessibleTableCellListener(AccessibleTableCellListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTableCell interface.
void	addAccessibleTableListener(AccessibleTableListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTable interface.
void	addAccessibleTextListener(AccessibleTextListener listener)	Adds the listener to the collection of listeners who will be notified when an accessible client asks for custom text control specific information.
void	addAccessibleValueListener(AccessibleValueListener listener)	Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleValue interface.
void	addRelation(int type, Accessible target)	Adds a relation with the specified type and target to the receiver's set of relations.
void	dispose()	Disposes of the operating system resources associated with the receiver, and removes the receiver from its parent's list of children.
Control	getControl()	Returns the control for this Accessible object.
void	internal_dispose_Accessible()	Invokes platform specific functionality to dispose an accessible object.
static Accessible	internal_new_Accessible(Control control)	Invokes platform specific functionality to allocate a new accessible object.
int	internal_WM_GETOBJECT(int wParam, int lParam)	Invokes platform specific functionality to handle a window message.
void	removeAccessibleActionListener(AccessibleActionListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAction interface.
void	removeAccessibleAttributeListener(AccessibleAttributeListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAttribute interface.
void	removeAccessibleControlListener(AccessibleControlListener listener)	Removes the listener from the collection of listeners who will be notified when an accessible client asks for custom control specific information.
void	removeAccessibleEditableTextListener(AccessibleEditableTextListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleEditableText interface.
void	removeAccessibleHyperlinkListener(AccessibleHyperlinkListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleHyperlink interface.
void	removeAccessibleListener(AccessibleListener listener)	Removes the listener from the collection of listeners who will be notified when an accessible client asks for certain strings, such as name, description, help, or keyboard shortcut.
void	removeAccessibleTableCellListener(AccessibleTableCellListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTableCell interface.
void	removeAccessibleTableListener(AccessibleTableListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTable interface.
void	removeAccessibleTextListener(AccessibleTextListener listener)	Removes the listener from the collection of listeners who will be notified when an accessible client asks for custom text control specific information.
void	removeAccessibleValueListener(AccessibleValueListener listener)	Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleValue interface.
void	removeRelation(int type, Accessible target)	Removes the relation with the specified type and target from the receiver's set of relations.
void	selectionChanged()	Sends a message to accessible clients that the child selection within a custom container control has changed.
void	sendEvent(int event, Object eventData)	Sends a message with event-specific data to accessible clients indicating that something has changed within a custom control.
void	setFocus(int childID)	Sends a message to accessible clients indicating that the focus has changed within a custom control.
void	textCaretMoved(int index)	Sends a message to accessible clients that the text caret has moved within a custom control.
void	textChanged(int type, int startIndex, int length)	Sends a message to accessible clients that the text within a custom control has changed.
void	textSelectionChanged()	Sends a message to accessible clients that the text selection has changed within a custom control.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Accessible

public Accessible(Accessible parent)

Constructs a new instance of this class given its parent.

Parameters:

parent - the Accessible parent, which must not be null

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the parent is null

See Also:

• Control.getAccessible()

Method Details

internal_new_Accessible

public static Accessible internal_new_Accessible(Control control)

Invokes platform specific functionality to allocate a new accessible object.

IMPORTANT: This method is not part of the public API for Accessible. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code.

Parameters:

control - the control to get the accessible object for

Returns:

the platform specific accessible object

addAccessibleListener

public void addAccessibleListener(AccessibleListener listener)

Adds the listener to the collection of listeners who will be notified when an accessible client asks for certain strings, such as name, description, help, or keyboard shortcut. The listener is notified by sending it one of the messages defined in the AccessibleListener interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for a name, description, help, or keyboard shortcut string

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleListener
• removeAccessibleListener(AccessibleListener)

removeAccessibleListener

public void removeAccessibleListener(AccessibleListener listener)

Removes the listener from the collection of listeners who will be notified when an accessible client asks for certain strings, such as name, description, help, or keyboard shortcut.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for a name, description, help, or keyboard shortcut string

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleListener
• addAccessibleListener(AccessibleListener)

addAccessibleControlListener

public void addAccessibleControlListener(AccessibleControlListener listener)

Adds the listener to the collection of listeners who will be notified when an accessible client asks for custom control specific information. The listener is notified by sending it one of the messages defined in the AccessibleControlListener interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for custom control specific information

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleControlListener
• removeAccessibleControlListener(AccessibleControlListener)

removeAccessibleControlListener

public void removeAccessibleControlListener(AccessibleControlListener listener)

Removes the listener from the collection of listeners who will be notified when an accessible client asks for custom control specific information.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for custom control specific information

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleControlListener
• addAccessibleControlListener(AccessibleControlListener)

addAccessibleTextListener

public void addAccessibleTextListener(AccessibleTextListener listener)

Adds the listener to the collection of listeners who will be notified when an accessible client asks for custom text control specific information. The listener is notified by sending it one of the messages defined in the AccessibleTextListener and AccessibleTextExtendedListener interfaces.

Parameters:

listener - the listener that should be notified when the receiver is asked for custom text control specific information

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTextListener
• AccessibleTextExtendedListener
• removeAccessibleTextListener(AccessibleTextListener)

removeAccessibleTextListener

public void removeAccessibleTextListener(AccessibleTextListener listener)

Removes the listener from the collection of listeners who will be notified when an accessible client asks for custom text control specific information.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for custom text control specific information

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTextListener
• AccessibleTextExtendedListener
• addAccessibleTextListener(AccessibleTextListener)

addAccessibleActionListener

public void addAccessibleActionListener(AccessibleActionListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAction interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleAction interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleActionListener
• removeAccessibleActionListener(AccessibleActionListener)

addAccessibleEditableTextListener

public void addAccessibleEditableTextListener(AccessibleEditableTextListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleEditableText interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleEditableText interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleEditableTextListener
• removeAccessibleEditableTextListener(AccessibleEditableTextListener)

addAccessibleHyperlinkListener

public void addAccessibleHyperlinkListener(AccessibleHyperlinkListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleHyperlink interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleHyperlink interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleHyperlinkListener
• removeAccessibleHyperlinkListener(AccessibleHyperlinkListener)

addAccessibleTableListener

public void addAccessibleTableListener(AccessibleTableListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTable interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleTable interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTableListener
• removeAccessibleTableListener(AccessibleTableListener)

addAccessibleTableCellListener

public void addAccessibleTableCellListener(AccessibleTableCellListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTableCell interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleTableCell interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTableCellListener
• removeAccessibleTableCellListener(AccessibleTableCellListener)

addAccessibleValueListener

public void addAccessibleValueListener(AccessibleValueListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleValue interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleValue interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleValueListener
• removeAccessibleValueListener(AccessibleValueListener)

addAccessibleAttributeListener

public void addAccessibleAttributeListener(AccessibleAttributeListener listener)

Adds the listener to the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAttribute interface.

Parameters:

listener - the listener that should be notified when the receiver is asked for AccessibleAttribute interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleAttributeListener
• removeAccessibleAttributeListener(AccessibleAttributeListener)

addRelation

public void addRelation(int type,
 Accessible target)

Adds a relation with the specified type and target to the receiver's set of relations.

Parameters:

type - an ACC constant beginning with RELATION_* indicating the type of relation

target - the accessible that is the target for this relation

dispose

public void dispose()

Disposes of the operating system resources associated with the receiver, and removes the receiver from its parent's list of children.

This method should be called when an accessible that was created with the public constructor Accessible(Accessible parent) is no longer needed. You do not need to call this when the receiver's control is disposed, because all Accessible instances associated with a control are released when the control is disposed. It is also not necessary to call this for instances of Accessible that were retrieved with Control.getAccessible().

getControl

public Control getControl()

Returns the control for this Accessible object.

Returns:

the receiver's control

removeAccessibleActionListener

public void removeAccessibleActionListener(AccessibleActionListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAction interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleAction interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleActionListener
• addAccessibleActionListener(AccessibleActionListener)

removeAccessibleEditableTextListener

public void removeAccessibleEditableTextListener(AccessibleEditableTextListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleEditableText interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleEditableText interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleEditableTextListener
• addAccessibleEditableTextListener(AccessibleEditableTextListener)

removeAccessibleHyperlinkListener

public void removeAccessibleHyperlinkListener(AccessibleHyperlinkListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleHyperlink interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleHyperlink interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleHyperlinkListener
• addAccessibleHyperlinkListener(AccessibleHyperlinkListener)

removeAccessibleTableListener

public void removeAccessibleTableListener(AccessibleTableListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTable interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleTable interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTableListener
• addAccessibleTableListener(AccessibleTableListener)

removeAccessibleTableCellListener

public void removeAccessibleTableCellListener(AccessibleTableCellListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleTableCell interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleTableCell interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleTableCellListener
• addAccessibleTableCellListener(AccessibleTableCellListener)

removeAccessibleValueListener

public void removeAccessibleValueListener(AccessibleValueListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleValue interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleValue interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleValueListener
• addAccessibleValueListener(AccessibleValueListener)

removeAccessibleAttributeListener

public void removeAccessibleAttributeListener(AccessibleAttributeListener listener)

Removes the listener from the collection of listeners that will be notified when an accessible client asks for any of the properties defined in the AccessibleAttribute interface.

Parameters:

listener - the listener that should no longer be notified when the receiver is asked for AccessibleAttribute interface properties

Throws:

IllegalArgumentException -

• ERROR_NULL_ARGUMENT - if the listener is null

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• AccessibleAttributeListener
• addAccessibleAttributeListener(AccessibleAttributeListener)

removeRelation

public void removeRelation(int type,
 Accessible target)

Removes the relation with the specified type and target from the receiver's set of relations.

Parameters:

type - an ACC constant beginning with RELATION_* indicating the type of relation

target - the accessible that is the target for this relation

sendEvent

public void sendEvent(int event,
 Object eventData)

Sends a message with event-specific data to accessible clients indicating that something has changed within a custom control.

Parameters:

event - an ACC constant beginning with EVENT_* indicating the message to send

eventData - an object containing event-specific data, or null if there is no event-specific data

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• ACC.EVENT_ACTION_CHANGED
• ACC.EVENT_ATTRIBUTE_CHANGED
• ACC.EVENT_DESCRIPTION_CHANGED
• ACC.EVENT_DOCUMENT_LOAD_COMPLETE
• ACC.EVENT_DOCUMENT_LOAD_STOPPED
• ACC.EVENT_DOCUMENT_RELOAD
• ACC.EVENT_HYPERLINK_ACTIVATED
• ACC.EVENT_HYPERLINK_ANCHOR_COUNT_CHANGED
• ACC.EVENT_HYPERLINK_END_INDEX_CHANGED
• ACC.EVENT_HYPERLINK_SELECTED_LINK_CHANGED
• ACC.EVENT_HYPERLINK_START_INDEX_CHANGED
• ACC.EVENT_HYPERTEXT_LINK_COUNT_CHANGED
• ACC.EVENT_HYPERTEXT_LINK_SELECTED
• ACC.EVENT_LOCATION_CHANGED
• ACC.EVENT_NAME_CHANGED
• ACC.EVENT_PAGE_CHANGED
• ACC.EVENT_SECTION_CHANGED
• ACC.EVENT_SELECTION_CHANGED
• ACC.EVENT_STATE_CHANGED
• ACC.EVENT_TABLE_CAPTION_CHANGED
• ACC.EVENT_TABLE_CHANGED
• ACC.EVENT_TABLE_COLUMN_DESCRIPTION_CHANGED
• ACC.EVENT_TABLE_COLUMN_HEADER_CHANGED
• ACC.EVENT_TABLE_ROW_DESCRIPTION_CHANGED
• ACC.EVENT_TABLE_ROW_HEADER_CHANGED
• ACC.EVENT_TABLE_SUMMARY_CHANGED
• ACC.EVENT_TEXT_ATTRIBUTE_CHANGED
• ACC.EVENT_TEXT_CARET_MOVED
• ACC.EVENT_TEXT_CHANGED
• ACC.EVENT_TEXT_COLUMN_CHANGED
• ACC.EVENT_TEXT_SELECTION_CHANGED
• ACC.EVENT_VALUE_CHANGED

selectionChanged

public void selectionChanged()

Sends a message to accessible clients that the child selection within a custom container control has changed.

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

textCaretMoved

public void textCaretMoved(int index)

Sends a message to accessible clients that the text caret has moved within a custom control.

Parameters:

index - the new caret index within the control

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

textChanged

public void textChanged(int type,
 int startIndex,
 int length)

Sends a message to accessible clients that the text within a custom control has changed.

Parameters:

type - the type of change, one of ACC.TEXT_INSERT or ACC.TEXT_DELETE

startIndex - the text index within the control where the insertion or deletion begins

length - the non-negative length in characters of the insertion or deletion

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

See Also:

• ACC.TEXT_INSERT
• ACC.TEXT_DELETE

textSelectionChanged

public void textSelectionChanged()

Sends a message to accessible clients that the text selection has changed within a custom control.

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

setFocus

public void setFocus(int childID)

Sends a message to accessible clients indicating that the focus has changed within a custom control.

Parameters:

childID - an identifier specifying a child of the control

Throws:

SWTException -

• ERROR_WIDGET_DISPOSED - if the receiver's control has been disposed
• ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver's control

internal_dispose_Accessible

public void internal_dispose_Accessible()

Invokes platform specific functionality to dispose an accessible object.

IMPORTANT: This method is not part of the public API for Accessible. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code.

internal_WM_GETOBJECT

public int internal_WM_GETOBJECT(int wParam,
 int lParam)

Invokes platform specific functionality to handle a window message.

IMPORTANT: This method is not part of the public API for Accessible. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code.