Java™ Platform
Standard Ed. 6

java.awt
Class TextComponent.AccessibleAWTTextComponent

java.lang.Object
  extended by javax.accessibility.AccessibleContext
      extended by java.awt.Component.AccessibleAWTComponent
          extended by java.awt.TextComponent.AccessibleAWTTextComponent
All Implemented Interfaces:
TextListener, Serializable, EventListener, AccessibleComponent, AccessibleText
Direct Known Subclasses:
TextArea.AccessibleAWTTextArea, TextField.AccessibleAWTTextField
Enclosing class:
TextComponent

protected class TextComponent.AccessibleAWTTextComponent
extends Component.AccessibleAWTComponent
implements AccessibleText, TextListener

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

Since:
1.3
See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class java.awt.Component.AccessibleAWTComponent
Component.AccessibleAWTComponent.AccessibleAWTComponentHandler, Component.AccessibleAWTComponent.AccessibleAWTFocusHandler
 
Field Summary
 
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_COMPONENT_BOUNDS_CHANGED, ACCESSIBLE_DESCRIPTION_PROPERTY, ACCESSIBLE_HYPERTEXT_OFFSET, ACCESSIBLE_INVALIDATE_CHILDREN, 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_ATTRIBUTES_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
TextComponent.AccessibleAWTTextComponent()
          Constructs an AccessibleAWTTextComponent.
 
Method Summary
 AccessibleRole getAccessibleRole()
          Gets the role of this object.
 AccessibleStateSet getAccessibleStateSet()
          Gets the state set of the TextComponent.
 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 textValueChanged(TextEvent textEvent)
          TextListener notification of a text value change.
 
Methods inherited from class java.awt.Component.AccessibleAWTComponent
addFocusListener, addPropertyChangeListener, contains, getAccessibleAt, getAccessibleChild, getAccessibleChildrenCount, getAccessibleComponent, getAccessibleDescription, getAccessibleIndexInParent, getAccessibleName, getAccessibleParent, getBackground, getBounds, getCursor, getFont, getFontMetrics, getForeground, getLocale, getLocation, getLocationOnScreen, getSize, isEnabled, isFocusTraversable, isShowing, isVisible, removeFocusListener, removePropertyChangeListener, requestFocus, setBackground, setBounds, setCursor, setEnabled, setFont, setForeground, setLocation, setSize, setVisible
 
Methods inherited from class javax.accessibility.AccessibleContext
firePropertyChange, getAccessibleAction, getAccessibleEditableText, 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

TextComponent.AccessibleAWTTextComponent

public TextComponent.AccessibleAWTTextComponent()
Constructs an AccessibleAWTTextComponent. Adds a listener to track caret change.

Method Detail

textValueChanged

public void textValueChanged(TextEvent textEvent)
TextListener notification of a text value change.

Specified by:
textValueChanged in interface TextListener

getAccessibleStateSet

public AccessibleStateSet getAccessibleStateSet()
Gets the state set of the TextComponent. The AccessibleStateSet of an object is composed of a set of unique AccessibleStates. 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 Component.AccessibleAWTComponent
Returns:
an instance of AccessibleStateSet containing the current state set of the object
See Also:
AccessibleStateSet, AccessibleState, Component.AccessibleAWTComponent.addPropertyChangeListener(java.beans.PropertyChangeListener)

getAccessibleRole

public AccessibleRole getAccessibleRole()
Gets the role of this object.

Overrides:
getAccessibleRole in class Component.AccessibleAWTComponent
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
See Also:
AccessibleText

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.

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

Java™ Platform
Standard Ed. 6

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