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java.awt
Class TextArea

java.lang.Object
 |
 +--java.awt.Component
 |
 +--java.awt.TextComponent
 |
 +--java.awt.TextArea
All Implemented Interfaces:
Accessible, java.awt.image.ImageObserver, MenuContainer, Serializable
public class TextArea
extends TextComponent

Unsafe:

See Also:
Serialized Form

Field Summary
private static Set backwardTraversalKeys
Cache the Sets of forward and backward traversal keys so we need not look them up each time.
private static String base
(package private) int columns
The number of columns in the TextArea.
private static Set forwardTraversalKeys
Cache the Sets of forward and backward traversal keys so we need not look them up each time.
private static int nameCounter
(package private) int rows
The number of rows in the TextArea.
static int SCROLLBARS_BOTH
Enabled: Create and display both vertical and horizontal scrollbars.
static int SCROLLBARS_HORIZONTAL_ONLY
Enabled: Create and display horizontal scrollbar only.
static int SCROLLBARS_NONE
Enabled: Do not create or display any scrollbars for the text area.
static int SCROLLBARS_VERTICAL_ONLY
Enabled: Create and display vertical scrollbar only.
private int scrollbarVisibility
Determines which scrollbars are created for the text area.
private static long serialVersionUID
private int textAreaSerializedDataVersion
The textArea Serialized Data Version.
Fields inherited from class java.awt.TextComponent
backgroundSetByClientCode, editable, selectionEnd, selectionStart, text, textListener
Fields inherited from class java.awt.Component
accessibleContext, actionListenerK, adjustmentListenerK, appContext, background, BOTTOM_ALIGNMENT, bufferStrategy, CENTER_ALIGNMENT, componentListener, componentListenerK, componentOrientation, containerListenerK, cursor, dropTarget, enabled, eventMask, focusListener, focusListenerK, focusTraversalKeys, font, foreground, graphicsConfig, height, hierarchyBoundsListener, hierarchyBoundsListenerK, hierarchyListener, hierarchyListenerK, ignoreRepaint, incRate, inputMethodListener, inputMethodListenerK, isInc, isPacked, itemListenerK, keyListener, keyListenerK, LEFT_ALIGNMENT, locale, LOCK, metrics, minSize, mouseListener, mouseListenerK, mouseMotionListener, mouseMotionListenerK, mouseWheelListener, mouseWheelListenerK, newEventsOnly, ownedWindowK, parent, peer, peerFont, popups, prefSize, RIGHT_ALIGNMENT, textListenerK, TOP_ALIGNMENT, valid, visible, width, windowClosingException, windowFocusListenerK, windowListenerK, windowStateListenerK, x, y
Constructor Summary
TextArea()
Suppressed: Constructs a new text area with the empty string as text.
TextArea(int rows, int columns)
Suppressed: Constructs a new text area with the specified number of rows and columns and the empty string as text.
TextArea(String text)
Suppressed: Constructs a new text area with the specified text.
TextArea(String text, int rows, int columns)
Suppressed: Constructs a new text area with the specified text, and with the specified number of rows and columns.
TextArea(String text, int rows, int columns, int scrollbars)
Suppressed: Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified.
Method Summary
void addNotify()
Suppressed: Creates the TextArea's peer.
void append(String str)
Suppressed: Appends the given text to the text area's current text.
void appendText(String str)
Suppressed: @deprecated As of JDK version 1.1, replaced by append(String).
(package private) String constructComponentName()
Construct a name for this component.
AccessibleContext getAccessibleContext()
Suppressed: Returns the AccessibleContext associated with this TextArea.
int getColumns()
Suppressed: Returns the number of columns in this text area.
Dimension getMinimumSize()
Suppressed: Determines the minimum size of this text area.
Dimension getMinimumSize(int rows, int columns)
Suppressed: Determines the minimum size of a text area with the specified number of rows and columns.
Dimension getPreferredSize()
Suppressed: Determines the preferred size of this text area.
Dimension getPreferredSize(int rows, int columns)
Suppressed: Determines the preferred size of a text area with the specified number of rows and columns.
int getRows()
Suppressed: Returns the number of rows in the text area.
int getScrollbarVisibility()
Suppressed: Returns an enumerated value that indicates which scroll bars the text area uses.
private static void initIDs()
Initialize JNI field and method ids
void insert(String str, int pos)
Suppressed: Inserts the specified text at the specified position in this text area.
void insertText(String str, int pos)
Suppressed: @deprecated As of JDK version 1.1, replaced by insert(String, int).
Dimension minimumSize()
Suppressed: @deprecated As of JDK version 1.1, replaced by getMinimumSize().
Dimension minimumSize(int rows, int columns)
Suppressed: @deprecated As of JDK version 1.1, replaced by getMinimumSize(int, int).
protected String paramString()
Returns a string representing the state of this TextArea.
Dimension preferredSize()
Suppressed: @deprecated As of JDK version 1.1, replaced by getPreferredSize().
Dimension preferredSize(int rows, int columns)
Suppressed: @deprecated As of JDK version 1.1, replaced by getPreferredSize(int, int).
private void readObject(ObjectInputStream s)
Read the ObjectInputStream.
void replaceRange(String str, int start, int end)
Suppressed: Replaces text between the indicated start and end positions with the specified replacement text.
void replaceText(String str, int start, int end)
Suppressed: @deprecated As of JDK version 1.1, replaced by replaceRange(String, int, int).
void setColumns(int columns)
Suppressed: Sets the number of columns for this text area.
void setRows(int rows)
Suppressed: Sets the number of rows for this text area.
Methods inherited from class java.awt.TextComponent
addTextListener, areInputMethodsEnabled, enableInputMethods, eventEnabled, getBackground, getCaretPosition, getCharacterBounds, getIndexAtPoint, getListeners, getSelectedText, getSelectionEnd, getSelectionStart, getText, getTextListeners, isEditable, processEvent, processTextEvent, removeNotify, removeTextListener, select, selectAll, setBackground, setCaretPosition, setEditable, setSelectionEnd, setSelectionStart, setText
Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, adjustListeningChildrenOnParent, applyComponentOrientation, areFocusTraversalKeysSet, autoProcessMouseWheel, autoTransferFocus, bounds, checkGD, checkImage, checkImage, checkWindowClosingException, clearCurrentFocusCycleRootOnHide, clearMostRecentFocusOwnerOnHide, coalesceEvents, contains, contains, containsFocus, countHierarchyMembers, createBufferStrategy, createBufferStrategy, createChildHierarchyEvents, createHierarchyEvents, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, dispatchEventImpl, dispatchMouseWheelToAncestor, doLayout, enable, enable, enableEvents, eventTypeEnabled, firePropertyChange, firePropertyChange, firePropertyChange, getAccessibleIndexInParent, getAccessibleStateSet, getAlignmentX, getAlignmentY, getBackBuffer, getBounds, getBounds, getBufferStrategy, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys_NoIDCheck, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont_NoClientCode, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocation, getLocationOnScreen_NoTreeLock, getLocationOnScreen, getMaximumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getNativeContainer, getParent_NoClientCode, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getToolkitImpl, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, initializeFocusTraversalKeys, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isEnabledImpl, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFocusTraversableOverridden, isFontSet, isForegroundSet, isLightweight, isOpaque, isRecursivelyVisible, isShowing, isValid, isVisible, iterate, keyDown, keyUp, layout, lightweightPaint, lightweightPrint, list, list, list, list, list, locate, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, nextFocusHelper, numListening, paint, paintAll, paintHeavyweightComponents, postEvent, postsOldMouseEvents, prepareImage, prepareImage, print, printAll, printHeavyweightComponents, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusHelper, requestFocusInWindow, requestFocusInWindow, resetGC, reshape, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys_NoIDCheck, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setGCFromPeer, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocus, transferFocusBackward, transferFocusUpCycle, update, updateCursorImmediately, validate
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

rows

int rows
The number of rows in the TextArea. This parameter will determine the text area's height. Guaranteed to be non-negative.

See Also:
getRows(), setRows(int)

columns

int columns
The number of columns in the TextArea. A column is an approximate average character width that is platform-dependent. This parameter will determine the text area's width. Guaranteed to be non-negative.

See Also:
setColumns(int), getColumns()

base

private static final String base

nameCounter

private static int nameCounter

SCROLLBARS_BOTH

public static final int SCROLLBARS_BOTH
Enabled: Create and display both vertical and horizontal scrollbars.

Since:
JDK1.1

SCROLLBARS_VERTICAL_ONLY

public static final int SCROLLBARS_VERTICAL_ONLY
Enabled: Create and display vertical scrollbar only.

Since:
JDK1.1

SCROLLBARS_HORIZONTAL_ONLY

public static final int SCROLLBARS_HORIZONTAL_ONLY
Enabled: Create and display horizontal scrollbar only.

Since:
JDK1.1

SCROLLBARS_NONE

public static final int SCROLLBARS_NONE
Enabled: Do not create or display any scrollbars for the text area.

Since:
JDK1.1

scrollbarVisibility

private int scrollbarVisibility
Determines which scrollbars are created for the text area. It can be one of four values : SCROLLBARS_BOTH = both scrollbars.
SCROLLBARS_HORIZONTAL_ONLY = Horizontal bar only.
SCROLLBARS_VERTICAL_ONLY = Vertical bar only.
SCROLLBARS_NONE = No scrollbars.

See Also:
getScrollbarVisibility()

forwardTraversalKeys

private static Set forwardTraversalKeys
Cache the Sets of forward and backward traversal keys so we need not look them up each time.

backwardTraversalKeys

private static Set backwardTraversalKeys
Cache the Sets of forward and backward traversal keys so we need not look them up each time.

serialVersionUID

private static final long serialVersionUID

textAreaSerializedDataVersion

private int textAreaSerializedDataVersion
The textArea Serialized Data Version.

Constructor Detail

TextArea

public TextArea()
 throws HeadlessException
Suppressed: Constructs a new text area with the empty string as text. This text area is created with scrollbar visibility equal to SCROLLBARS_BOTH, so both vertical and horizontal scrollbars will be visible for this text area.

See Also:
java.awt.GraphicsEnvironment#isHeadless()

TextArea

public TextArea(String text)
 throws HeadlessException
Suppressed: Constructs a new text area with the specified text. This text area is created with scrollbar visibility equal to SCROLLBARS_BOTH, so both vertical and horizontal scrollbars will be visible for this text area.

Parameters:
text - the text to be displayed; if text is null, the empty string "" will be displayed
See Also:
java.awt.GraphicsEnvironment#isHeadless()

TextArea

public TextArea(int rows,
 int columns)
 throws HeadlessException
Suppressed: Constructs a new text area with the specified number of rows and columns and the empty string as text. A column is an approximate average character width that is platform-dependent. The text area is created with scrollbar visibility equal to SCROLLBARS_BOTH, so both vertical and horizontal scrollbars will be visible for this text area.

Parameters:
rows - the number of rows
columns - the number of columns
See Also:
java.awt.GraphicsEnvironment#isHeadless()

TextArea

public TextArea(String text,
 int rows,
 int columns)
 throws HeadlessException
Suppressed: Constructs a new text area with the specified text, and with the specified number of rows and columns. A column is an approximate average character width that is platform-dependent. The text area is created with scrollbar visibility equal to SCROLLBARS_BOTH, so both vertical and horizontal scrollbars will be visible for this text area.

Parameters:
text - the text to be displayed; if text is null, the empty string "" will be displayed
rows - the number of rows
columns - the number of columns
See Also:
java.awt.GraphicsEnvironment#isHeadless()

TextArea

public TextArea(String text,
 int rows,
 int columns,
 int scrollbars)
 throws HeadlessException
Suppressed: Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified. All TextArea constructors defer to this one.

The TextArea class defines several constants that can be supplied as values for the scrollbars argument:

  • SCROLLBARS_BOTH,
  • SCROLLBARS_VERTICAL_ONLY,
  • SCROLLBARS_HORIZONTAL_ONLY,
  • SCROLLBARS_NONE.
Any other value for the scrollbars argument is invalid and will result in this text area being created with scrollbar visibility equal to the default value of SCROLLBARS_BOTH.

Parameters:
text - the text to be displayed; if text is null, the empty string "" will be displayed
rows - the number of rows; if rows is less than 0, rows is set to 0
columns - the number of columns; if columns is less than 0, columns is set to 0
scrollbars - a constant that determines what scrollbars are created to view the text area
Since:
JDK1.1
See Also:
java.awt.GraphicsEnvironment#isHeadless()
Method Detail

initIDs

private static void initIDs()
Initialize JNI field and method ids

constructComponentName

String constructComponentName()
Construct a name for this component. Called by getName when the name is null.

Overrides:
constructComponentName in class Component

addNotify

public void addNotify()
Suppressed: Creates the TextArea's peer. The peer allows us to modify the appearance of the TextArea without changing any of its functionality.

Overrides:
addNotify in class TextComponent
See Also:
java.awt.TextComponent#removeNotify

insert

public void insert(String str,
 int pos)
Suppressed: Inserts the specified text at the specified position in this text area.

Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

Parameters:
str - the non-null text to insert
pos - the position at which to insert
Since:
JDK1.1
See Also:
java.awt.TextComponent#setText, java.awt.TextArea#replaceRange, java.awt.TextArea#append

insertText

public void insertText(String str,
 int pos)
Suppressed: @deprecated As of JDK version 1.1, replaced by insert(String, int).

append

public void append(String str)
Suppressed: Appends the given text to the text area's current text.

Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

Parameters:
str - the non-null text to append
Since:
JDK1.1
See Also:
java.awt.TextArea#insert

appendText

public void appendText(String str)
Suppressed: @deprecated As of JDK version 1.1, replaced by append(String).

replaceRange

public void replaceRange(String str,
 int start,
 int end)
Suppressed: Replaces text between the indicated start and end positions with the specified replacement text. The text at the end position will not be replaced. The text at the start position will be replaced (unless the start position is the same as the end position). The text position is zero-based. The inserted substring may be of a different length than the text it replaces.

Note that passing null or inconsistent parameters is invalid and will result in unspecified behavior.

Parameters:
str - the non-null text to use as the replacement
start - the start position
end - the end position
Since:
JDK1.1
See Also:
java.awt.TextArea#insert

replaceText

public void replaceText(String str,
 int start,
 int end)
Suppressed: @deprecated As of JDK version 1.1, replaced by replaceRange(String, int, int).

getRows

public int getRows()
Suppressed: Returns the number of rows in the text area.

Returns:
the number of rows in the text area
Since:
JDK1
See Also:
setRows(int), getColumns()

setRows

public void setRows(int rows)
Suppressed: Sets the number of rows for this text area.

Parameters:
rows - the number of rows
Since:
JDK1.1
See Also:
getRows(), setColumns(int)

getColumns

public int getColumns()
Suppressed: Returns the number of columns in this text area.

Returns:
the number of columns in the text area
See Also:
setColumns(int), getRows()

setColumns

public void setColumns(int columns)
Suppressed: Sets the number of columns for this text area.

Parameters:
columns - the number of columns
Since:
JDK1.1
See Also:
getColumns(), setRows(int)

getScrollbarVisibility

public int getScrollbarVisibility()
Suppressed: Returns an enumerated value that indicates which scroll bars the text area uses.

The TextArea class defines four integer constants that are used to specify which scroll bars are available. TextArea has one constructor that gives the application discretion over scroll bars.

Returns:
an integer that indicates which scroll bars are used
Since:
JDK1.1
See Also:
java.awt.TextArea#SCROLLBARS_BOTH, java.awt.TextArea#SCROLLBARS_VERTICAL_ONLY, java.awt.TextArea#SCROLLBARS_HORIZONTAL_ONLY, java.awt.TextArea#SCROLLBARS_NONE, java.awt.TextArea#TextArea(java.lang.String, int, int, int)

getPreferredSize

public Dimension getPreferredSize(int rows,
 int columns)
Suppressed: Determines the preferred size of a text area with the specified number of rows and columns.

Parameters:
rows - the number of rows
Returns:
the preferred dimensions required to display the text area with the specified number of rows and columns
Since:
JDK1.1
See Also:
java.awt.Component#getPreferredSize

preferredSize

public Dimension preferredSize(int rows,
 int columns)
Suppressed: @deprecated As of JDK version 1.1, replaced by getPreferredSize(int, int).

getPreferredSize

public Dimension getPreferredSize()
Suppressed: Determines the preferred size of this text area.

Overrides:
getPreferredSize in class Component
Returns:
the preferred dimensions needed for this text area
Since:
JDK1.1
See Also:
java.awt.Component#getPreferredSize

preferredSize

public Dimension preferredSize()
Suppressed: @deprecated As of JDK version 1.1, replaced by getPreferredSize().

Overrides:
preferredSize in class Component

getMinimumSize

public Dimension getMinimumSize(int rows,
 int columns)
Suppressed: Determines the minimum size of a text area with the specified number of rows and columns.

Parameters:
rows - the number of rows
Returns:
the minimum dimensions required to display the text area with the specified number of rows and columns
Since:
JDK1.1
See Also:
java.awt.Component#getMinimumSize

minimumSize

public Dimension minimumSize(int rows,
 int columns)
Suppressed: @deprecated As of JDK version 1.1, replaced by getMinimumSize(int, int).

getMinimumSize

public Dimension getMinimumSize()
Suppressed: Determines the minimum size of this text area.

Overrides:
getMinimumSize in class Component
Returns:
the preferred dimensions needed for this text area
Since:
JDK1.1
See Also:
java.awt.Component#getPreferredSize

minimumSize

public Dimension minimumSize()
Suppressed: @deprecated As of JDK version 1.1, replaced by getMinimumSize().

Overrides:
minimumSize in class Component

paramString

protected String paramString()
Returns a string representing the state of this TextArea. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

Overrides:
paramString in class TextComponent
Returns:
the parameter string of this text area

readObject

private void readObject(ObjectInputStream s)
 throws ClassNotFoundException,
 IOException,
 HeadlessException
Read the ObjectInputStream.

ClassNotFoundException
IOException
HeadlessException
See Also:
java.awt.GraphicsEnvironment#isHeadless

getAccessibleContext

public AccessibleContext getAccessibleContext()
Suppressed: Returns the AccessibleContext associated with this TextArea. For text areas, the AccessibleContext takes the form of an AccessibleAWTTextArea. A new AccessibleAWTTextArea instance is created if necessary.

Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class TextComponent
Returns:
an AccessibleAWTTextArea that serves as the AccessibleContext of this TextArea
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