Class JTextComponent. AccessibleJTextComponent

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.AccessibleJComponent.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

  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. The screen coordinates returned are "unscrolled coordinates" if the JTextComponent is contained in a JScrollPane in which case the resulting rectangle should be composed with the parent coordinates. A good algorithm to use is: Accessible a: AccessibleText at = a.getAccessibleText(); AccessibleComponent ac = a.getAccessibleComponent(); Rectangle r = at.getCharacterBounds(); Point p = ac.getLocation(); r.x += p.x; r.y += p.y; 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 indices)

  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. Whitespace between words is treated as a word.

  Specified by:

  getAtIndex in interface AccessibleText

  Parameters:

  part - the CHARACTER, WORD, or SENTENCE to retrieve

  index - an index within the text

  Returns:

  the letter, word, or sentence.

• getAfterIndex

  public String getAfterIndex(int part,
                     int index)

  Returns the String after a given index. Whitespace between words is treated as a word.

  Specified by:

  getAfterIndex in interface AccessibleText

  Parameters:

  part - the CHARACTER, WORD, or SENTENCE to retrieve

  index - an index within the text

  Returns:

  the letter, word, or sentence.

• getBeforeIndex

  public String getBeforeIndex(int part,
                      int index)

  Returns the String before a given index. Whitespace between words is treated a word.

  Specified by:

  getBeforeIndex in interface AccessibleText

  Parameters:

  part - the CHARACTER, WORD, or SENTENCE to retrieve

  index - an index within the text

  Returns:

  the letter, word, or sentence.

• getAccessibleEditableText

  public AccessibleEditableText getAccessibleEditableText()

  Returns the AccessibleEditableText interface for this text component.

  Overrides:

  getAccessibleEditableText in class AccessibleContext

  Returns:

  the AccessibleEditableText interface

  Since:

  1.4

  See Also:

  AccessibleEditableText

• setTextContents

  public void setTextContents(String s)

  Sets the text contents to the specified string.

  Specified by:

  setTextContents in interface AccessibleEditableText

  Parameters:

  s - the string to set the text contents

  Since:

  1.4

• insertTextAtIndex

  public void insertTextAtIndex(int index,
                       String s)

  Inserts the specified string at the given index

  Specified by:

  insertTextAtIndex in interface AccessibleEditableText

  Parameters:

  index - the index in the text where the string will be inserted

  s - the string to insert in the text

  Since:

  1.4

• getTextRange

  public String getTextRange(int startIndex,
                    int endIndex)

  Returns the text string between two indices.

  Specified by:

  getTextRange in interface AccessibleEditableText

  Specified by:

  getTextRange in interface AccessibleExtendedText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  Returns:

  the text string between the indices

  Since:

  1.4

• delete

  public void delete(int startIndex,
            int endIndex)

  Deletes the text between two indices

  Specified by:

  delete in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  Since:

  1.4

• cut

  public void cut(int startIndex,
         int endIndex)

  Cuts the text between two indices into the system clipboard.

  Specified by:

  cut in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  Since:

  1.4

• paste

  public void paste(int startIndex)

  Pastes the text from the system clipboard into the text starting at the specified index.

  Specified by:

  paste in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  Since:

  1.4

• replaceText

  public void replaceText(int startIndex,
                 int endIndex,
                 String s)

  Replaces the text between two indices with the specified string.

  Specified by:

  replaceText in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  s - the string to replace the text between two indices

  Since:

  1.4

• selectText

  public void selectText(int startIndex,
                int endIndex)

  Selects the text between two indices.

  Specified by:

  selectText in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  Since:

  1.4

• setAttributes

  public void setAttributes(int startIndex,
                   int endIndex,
                   AttributeSet as)

  Sets attributes for the text between two indices.

  Specified by:

  setAttributes in interface AccessibleEditableText

  Parameters:

  startIndex - the starting index in the text

  endIndex - the ending index in the text

  as - the attribute set

  Since:

  1.4

  See Also:

  AttributeSet

• getTextSequenceAt

  public AccessibleTextSequence getTextSequenceAt(int part,
                                         int index)

  Returns the AccessibleTextSequence at a given index.

  Specified by:

  getTextSequenceAt in interface AccessibleExtendedText

  Parameters:

  part - the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to retrieve

  index - an index within the text

  Returns:

  an AccessibleTextSequence specifying the text if part and index are valid. Otherwise, null is returned

  Since:

  1.6

  See Also:

  AccessibleText.CHARACTER, AccessibleText.WORD, AccessibleText.SENTENCE, AccessibleExtendedText.LINE, AccessibleExtendedText.ATTRIBUTE_RUN

• getTextSequenceAfter

  public AccessibleTextSequence getTextSequenceAfter(int part,
                                            int index)

  Returns the AccessibleTextSequence after a given index.

  Specified by:

  getTextSequenceAfter in interface AccessibleExtendedText

  Parameters:

  part - the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to retrieve

  index - an index within the text

  Returns:

  an AccessibleTextSequence specifying the text if part and index are valid. Otherwise, null is returned

  Since:

  1.6

  See Also:

  AccessibleText.CHARACTER, AccessibleText.WORD, AccessibleText.SENTENCE, AccessibleExtendedText.LINE, AccessibleExtendedText.ATTRIBUTE_RUN

• getTextSequenceBefore

  public AccessibleTextSequence getTextSequenceBefore(int part,
                                             int index)

  Returns the AccessibleTextSequence before a given index.

  Specified by:

  getTextSequenceBefore in interface AccessibleExtendedText

  Parameters:

  part - the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to retrieve

  index - an index within the text

  Returns:

  an AccessibleTextSequence specifying the text if part and index are valid. Otherwise, null is returned

  Since:

  1.6

  See Also:

  AccessibleText.CHARACTER, AccessibleText.WORD, AccessibleText.SENTENCE, AccessibleExtendedText.LINE, AccessibleExtendedText.ATTRIBUTE_RUN

• getTextBounds

  public Rectangle getTextBounds(int startIndex,
                        int endIndex)

  Returns the Rectangle enclosing the text between two indicies.

  Specified by:

  getTextBounds in interface AccessibleExtendedText

  Parameters:

  startIndex - the start index in the text

  endIndex - the end index in the text

  Returns:

  the bounding rectangle of the text if the indices are valid. Otherwise, null is returned

  Since:

  1.6

• getAccessibleAction

  public AccessibleAction getAccessibleAction()

  Description copied from class: AccessibleContext
  Gets the AccessibleAction associated with this object that supports one or more actions.

  Overrides:

  getAccessibleAction in class AccessibleContext

  Returns:

  AccessibleAction if supported by object; else return null

  See Also:

  AccessibleAction

• getAccessibleActionCount

  public int getAccessibleActionCount()

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

  Specified by:

  getAccessibleActionCount in interface AccessibleAction

  Returns:

  the zero-based number of Actions in this object

  Since:

  1.4

• getAccessibleActionDescription

  public String getAccessibleActionDescription(int i)

  Returns a description of the specified action of the object.

  Specified by:

  getAccessibleActionDescription in interface AccessibleAction

  Parameters:

  i - zero-based index of the actions

  Returns:

  a String description of the action

  Since:

  1.4

  See Also:

  getAccessibleActionCount()

• doAccessibleAction

  public boolean doAccessibleAction(int i)

  Performs the specified Action on the object

  Specified by:

  doAccessibleAction in interface AccessibleAction

  Parameters:

  i - zero-based index of actions

  Returns:

  true if the action was performed; otherwise false.

  Since:

  1.4

  See Also:

  getAccessibleActionCount()