javax.swing.text
Class JTextComponent.AccessibleJTextComponent

java.lang.Object
  |
  +--javax.accessibility.AccessibleContext
        |
        +--java.awt.Component.AccessibleAWTComponent
              |
              +--java.awt.Container.AccessibleAWTContainer
                    |
                    +--javax.swing.JComponent.AccessibleJComponent
                          |
                          +--javax.swing.text.JTextComponent.AccessibleJTextComponent

All Implemented Interfaces:

AccessibleComponent, AccessibleText, CaretListener, DocumentListener, EventListener, Serializable

Direct Known Subclasses:

JEditorPane.AccessibleJEditorPane, JTextArea.AccessibleJTextArea, JTextField.AccessibleJTextField

Enclosing class:

JTextComponent

public class JTextComponent.AccessibleJTextComponent

extends JComponent.AccessibleJComponent

implements AccessibleText, CaretListener, DocumentListener

This class implements accessibility support for the JTextComponent class. It provides an implementation of the Java Accessibility API appropriate to menu user-interface elements.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.

See Also:

Serialized Form

Inner classes inherited from class javax.swing.JComponent.AccessibleJComponent

JComponent.AccessibleJComponent.AccessibleContainerHandler, JComponent.AccessibleJComponent.AccessibleFocusHandler

Inner classes inherited from class java.awt.Container.AccessibleAWTContainer

Container.AccessibleAWTContainer.AccessibleContainerHandler

Inner classes inherited from class java.awt.Component.AccessibleAWTComponent

Component.AccessibleAWTComponent.AccessibleAWTComponentHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler

Fields inherited from class javax.swing.JComponent.AccessibleJComponent

accessibleContainerHandler, accessibleFocusHandler

Fields inherited from class java.awt.Component.AccessibleAWTComponent

accessibleAWTComponentHandler, accessibleAWTFocusHandler

Fields inherited from class javax.accessibility.AccessibleContext

ACCESSIBLE_ACTION_PROPERTY, ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY, ACCESSIBLE_CARET_PROPERTY, ACCESSIBLE_CHILD_PROPERTY, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_NAME_PROPERTY, ACCESSIBLE_SELECTION_PROPERTY, ACCESSIBLE_STATE_PROPERTY, ACCESSIBLE_TABLE_CAPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED, ACCESSIBLE_TABLE_MODEL_CHANGED, ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED, ACCESSIBLE_TABLE_ROW_HEADER_CHANGED, ACCESSIBLE_TABLE_SUMMARY_CHANGED, ACCESSIBLE_TEXT_PROPERTY, ACCESSIBLE_VALUE_PROPERTY, ACCESSIBLE_VISIBLE_DATA_PROPERTY, accessibleDescription, accessibleName, accessibleParent

Fields inherited from interface javax.accessibility.AccessibleText

CHARACTER, SENTENCE, WORD

Constructor Summary

JTextComponent.AccessibleJTextComponent()
Constructs an AccessibleJTextComponent.

Method Summary

void	caretUpdate(CaretEvent e) Handles caret updates (fire appropriate property change event, which are AccessibleContext.ACCESSIBLE_CARET_PROPERTY and AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY).
void	changedUpdate(DocumentEvent e) Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).
AccessibleRole	getAccessibleRole() Gets the role of this object.
AccessibleStateSet	getAccessibleStateSet() Gets the state set of the JTextComponent.
AccessibleText	getAccessibleText() Get the AccessibleText associated with this object.
String	getAfterIndex(int part, int index) Returns the String after a given index.
String	getAtIndex(int part, int index) Returns the String at a given index.
String	getBeforeIndex(int part, int index) Returns the String before a given index.
int	getCaretPosition() Returns the zero-based offset of the caret.
AttributeSet	getCharacterAttribute(int i) Returns the AttributeSet for a given character (at a given index).
Rectangle	getCharacterBounds(int i) Determines the bounding box of the character at the given index into the string.
int	getCharCount() Returns the number of characters (valid indicies)
int	getIndexAtPoint(Point p) Given a point in local coordinates, return the zero-based index of the character under that Point.
String	getSelectedText() Returns the portion of the text that is selected.
int	getSelectionEnd() Returns the end offset within the selected text.
int	getSelectionStart() Returns the start offset within the selected text.
void	insertUpdate(DocumentEvent e) Handles document insert (fire appropriate property change event which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).
void	removeUpdate(DocumentEvent e) Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY).

Methods inherited from class javax.swing.JComponent.AccessibleJComponent

addPropertyChangeListener, getAccessibleChild, getAccessibleChildrenCount, getAccessibleDescription, getAccessibleName, getBorderTitle, removePropertyChangeListener

Methods inherited from class java.awt.Container.AccessibleAWTContainer

getAccessibleAt

Methods inherited from class java.awt.Component.AccessibleAWTComponent

addFocusListener, contains, getAccessibleComponent, getAccessibleIndexInParent, getAccessibleParent, getBackground, getBounds, getCursor, getFont, getFontMetrics, getForeground, getLocale, getLocation, getLocationOnScreen, getSize, isEnabled, isFocusTraversable, isShowing, isVisible, removeFocusListener, requestFocus, setBackground, setBounds, setCursor, setEnabled, setFont, setForeground, setLocation, setSize, setVisible

Methods inherited from class javax.accessibility.AccessibleContext

firePropertyChange, getAccessibleAction, getAccessibleIcon, getAccessibleRelationSet, getAccessibleSelection, getAccessibleTable, getAccessibleValue, setAccessibleDescription, setAccessibleName, setAccessibleParent

Methods inherited from class java.lang.Object

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

Constructor Detail

JTextComponent.AccessibleJTextComponent

public JTextComponent.AccessibleJTextComponent()

Constructs an AccessibleJTextComponent. Adds a listener to track caret change.

Method Detail

caretUpdate

public void caretUpdate(CaretEvent e)

Handles caret updates (fire appropriate property change event, which are AccessibleContext.ACCESSIBLE_CARET_PROPERTY and AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY). This keeps track of the dot position internally. When the caret moves, the internal position is updated after firing the event.

Specified by:

caretUpdate in interface CaretListener

Parameters:

e - the CaretEvent

insertUpdate

public void insertUpdate(DocumentEvent e)

Handles document insert (fire appropriate property change event which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY). This tracks the changed offset via the event.

Specified by:

insertUpdate in interface DocumentListener

Parameters:

e - the DocumentEvent

removeUpdate

public void removeUpdate(DocumentEvent e)

Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY). This tracks the changed offset via the event.

Specified by:

removeUpdate in interface DocumentListener

Parameters:

e - the DocumentEvent

changedUpdate

public void changedUpdate(DocumentEvent e)

Handles document remove (fire appropriate property change event, which is AccessibleContext.ACCESSIBLE_TEXT_PROPERTY). This tracks the changed offset via the event.

Specified by:

changedUpdate in interface DocumentListener

Parameters:

e - the DocumentEvent

getAccessibleStateSet

public AccessibleStateSet getAccessibleStateSet()

Gets the state set of the JTextComponent. The AccessibleStateSet of an object is composed of a set of unique AccessibleState's. A change in the AccessibleStateSet of an object will cause a PropertyChangeEvent to be fired for the AccessibleContext.ACCESSIBLE_STATE_PROPERTY property.

Overrides:

getAccessibleStateSet in class JComponent.AccessibleJComponent

Returns:

an instance of AccessibleStateSet containing the current state set of the object

See Also:

AccessibleStateSet, AccessibleState, JComponent.addPropertyChangeListener(java.beans.PropertyChangeListener)

getAccessibleRole

public AccessibleRole getAccessibleRole()

Gets the role of this object.

Overrides:

getAccessibleRole in class JComponent.AccessibleJComponent

Returns:

an instance of AccessibleRole describing the role of the object (AccessibleRole.TEXT)

See Also:

AccessibleRole

getAccessibleText

public AccessibleText getAccessibleText()

Get the AccessibleText associated with this object. In the implementation of the Java Accessibility API for this class, return this object, which is responsible for implementing the AccessibleText interface on behalf of itself.

Overrides:

getAccessibleText in class AccessibleContext

Returns:

this object

getIndexAtPoint

public int getIndexAtPoint(Point p)

Given a point in local coordinates, return the zero-based index of the character under that Point. If the point is invalid, this method returns -1.

Specified by:

getIndexAtPoint in interface AccessibleText

Parameters:

p - the Point in local coordinates

Returns:

the zero-based index of the character under Point p.

getCharacterBounds

public Rectangle getCharacterBounds(int i)

Determines the bounding box of the character at the given index into the string. The bounds are returned in local coordinates. If the index is invalid a null rectangle is returned. Note: the JTextComponent must have a valid size (e.g. have been added to a parent container whose ancestor container is a valid top-level window) for this method to be able to return a meaningful (non-null) value.

Specified by:

getCharacterBounds in interface AccessibleText

Parameters:

i - the index into the String >= 0

Returns:

the screen coordinates of the character's bounding box

getCharCount

public int getCharCount()

Returns the number of characters (valid indicies)

Specified by:

getCharCount in interface AccessibleText

Returns:

the number of characters >= 0

getCaretPosition

public int getCaretPosition()

Returns the zero-based offset of the caret. Note: The character to the right of the caret will have the same index value as the offset (the caret is between two characters).

Specified by:

getCaretPosition in interface AccessibleText

Returns:

the zero-based offset of the caret.

getCharacterAttribute

public AttributeSet getCharacterAttribute(int i)

Returns the AttributeSet for a given character (at a given index).

Specified by:

getCharacterAttribute in interface AccessibleText

Parameters:

i - the zero-based index into the text

Returns:

the AttributeSet of the character

getSelectionStart

public int getSelectionStart()

Returns the start offset within the selected text. If there is no selection, but there is a caret, the start and end offsets will be the same. Return 0 if the text is empty, or the caret position if no selection.

Specified by:

getSelectionStart in interface AccessibleText

Returns:

the index into the text of the start of the selection >= 0

getSelectionEnd

public int getSelectionEnd()

Returns the end offset within the selected text. If there is no selection, but there is a caret, the start and end offsets will be the same. Return 0 if the text is empty, or the caret position if no selection.

Specified by:

getSelectionEnd in interface AccessibleText

Returns:

the index into teh text of the end of the selection >= 0

getSelectedText

public String getSelectedText()

Returns the portion of the text that is selected.

Specified by:

getSelectedText in interface AccessibleText

Returns:

the text, null if no selection

getAtIndex

public String getAtIndex(int part,
                         int index)

Returns the String at a given index.

Specified by:

getAtIndex in interface AccessibleText

Parameters:

part - the AccessibleText.CHARACTER, AccessibleText.WORD, or AccessibleText.SENTENCE to retrieve

index - an index within the text >= 0

Returns:

the letter, word, or sentence, null for an invalid index or part

getAfterIndex

public String getAfterIndex(int part,
                            int index)

Returns the String after a given index.

Specified by:

getAfterIndex in interface AccessibleText

Parameters:

part - the AccessibleText.CHARACTER, AccessibleText.WORD, or AccessibleText.SENTENCE to retrieve

index - an index within the text >= 0

Returns:

the letter, word, or sentence, null for an invalid index or part

getBeforeIndex

public String getBeforeIndex(int part,
                             int index)

Returns the String before a given index.

Specified by:

getBeforeIndex in interface AccessibleText

Parameters:

part - the AccessibleText.CHARACTER, AccessibleText.WORD, or AccessibleText.SENTENCE to retrieve

index - an index within the text >= 0

Returns:

the letter, word, or sentence, null for an invalid index or part