Class java.awt.TextArea - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.TextArea

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.TextComponent
                   |
                   +----java.awt.TextArea

public class TextArea
extends TextComponent

A TextArea object is a multi-line region that displays text. It can be set to allow editing or to be read-only.

The following image shows the appearance of a text area:

This text area could be created by the following line of code:

 new TextArea("Hello", 5, 40);

SCROLLBARS_BOTH: Create and display both vertical and horizontal scrollbars.
SCROLLBARS_HORIZONTAL_ONLY: Create and display horizontal scrollbar only.
SCROLLBARS_NONE: Do not create or display any scrollbars for the text area.
SCROLLBARS_VERTICAL_ONLY: Create and display vertical scrollbar only.

TextArea(): Constructs a new text area.
TextArea(int, int): Constructs a new empty TextArea with the specified number of rows and columns.
TextArea(String): Constructs a new text area with the specified text.
TextArea(String, int, int): Constructs a new text area with the specified text, and with the specified number of rows and columns.
TextArea(String, int, int, int): Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified.

addNotify(): Creates the TextArea's peer.
append(String): Appends the given text to the text area's current text.
appendText(String): Deprecated.
getColumns(): Gets the number of columns in this text area.
getMinimumSize(): Determines the minimum size of this text area.
getMinimumSize(int, int): Determines the minimum size of a text area with the specified number of rows and columns.
getPreferredSize(): Determines the preferred size of this text area.
getPreferredSize(int, int): Determines the preferred size of a text area with the specified number of rows and columns.
getRows(): Gets the number of rows in the text area.
getScrollbarVisibility(): Gets an enumerated value that indicates which scroll bars the text area uses.
insert(String, int): Inserts the specified text at the specified position in this text area.
insertText(String, int): Deprecated.
minimumSize(): Deprecated.
minimumSize(int, int): Deprecated.
paramString(): Returns the parameter string representing the state of this text area.
preferredSize(): Deprecated.
preferredSize(int, int): Deprecated.
replaceRange(String, int, int): Replaces text between the indicated start and end positions with the specified replacement text.
replaceText(String, int, int): Deprecated.
setColumns(int): Sets the number of columns for this text area.
setRows(int): Sets the number of rows for this text area.

SCROLLBARS_BOTH

 public static final int SCROLLBARS_BOTH

Create and display both vertical and horizontal scrollbars.

SCROLLBARS_VERTICAL_ONLY

 public static final int SCROLLBARS_VERTICAL_ONLY

Create and display vertical scrollbar only.

SCROLLBARS_HORIZONTAL_ONLY

 public static final int SCROLLBARS_HORIZONTAL_ONLY

Create and display horizontal scrollbar only.

SCROLLBARS_NONE

 public static final int SCROLLBARS_NONE

Do not create or display any scrollbars for the text area.

TextArea

 public TextArea()

Constructs a new text area. This text area is created with both vertical and horizontal scroll bars.

TextArea

 public TextArea(String text)

Constructs a new text area with the specified text. This text area is created with both vertical and horizontal scroll bars.

Parameters:: text - the text to be displayed.

TextArea

 public TextArea(int rows,
                 int columns)

Constructs a new empty TextArea with the specified number of rows and columns.

Parameters:: rows - the number of rows; columns - the number of columns

TextArea

 public TextArea(String text,
                 int rows,
                 int columns)

Constructs a new text area with the specified text, and with the specified number of rows and columns. This text area is created with both vertical and horizontal scroll bars.

Parameters:: text - the text to be displayed.; rows - the number of rows.; columns - the number of columns.

TextArea

 public TextArea(String text,
                 int rows,
                 int columns,
                 int scrollbars)

Constructs a new text area with the specified text, and with the rows, columns, and scroll bar visibility as specified.

The TextArea class defines several constants that can be supplied as values for the scrollbars argument: SCROLLBARS_BOTH, SCROLLBARS_VERTICAL_ONLY, SCROLLBARS_HORIZONTAL_ONLY, and SCROLLBARS_NEITHER.

Parameters:: text - the text to be displayed.; rows - the number of rows.; columns - the number of columns.; scrollbars - a constant that determines what scrollbars are created to view the text area.

addNotify

 public void addNotify()

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 Component

insert

 public void insert(String str,
                    int pos)

Inserts the specified text at the specified position in this text area.

Parameters:: str - the text to insert.; pos - the position at which to insert.
See Also:: setText, replaceRange, append

insertText

 public synchronized void insertText(String str,
                                     int pos)

Note: insertText() is deprecated. As of JDK version 1.1, replaced by insert(String, int).

append

 public void append(String str)

Appends the given text to the text area's current text.

Parameters:: str - the text to append.
See Also:: insert

appendText

 public synchronized void appendText(String str)

Note: appendText() is deprecated. As of JDK version 1.1, replaced by append(String).

replaceRange

 public void replaceRange(String str,
                          int start,
                          int end)

Replaces text between the indicated start and end positions with the specified replacement text.

Parameters:: str - the text to use as the replacement.; start - the start position.; end - the end position.
See Also:: insert

replaceText

 public synchronized void replaceText(String str,
                                      int start,
                                      int end)

Note: replaceText() is deprecated. As of JDK version 1.1, replaced by replaceRange(String, int, int).

getRows

 public int getRows()

Gets the number of rows in the text area.

Returns:: the number of rows in the text area.
See Also:: setRows, getColumns

setRows

 public void setRows(int rows)

Sets the number of rows for this text area.

Parameters:: rows - the number of rows.
Throws: IllegalArgumentException: if the value supplied for rows is less than zero.
See Also:: getRows, setColumns

getColumns

 public int getColumns()

Gets the number of columns in this text area.

Returns:: the number of columns in the text area.
See Also:: setColumns, getRows

setColumns

 public void setColumns(int columns)

Sets the number of columns for this text area.

Parameters:: columns - the number of columns.
Throws: IllegalArgumentException: if the value supplied for columns is less than zero.
See Also:: getColumns, setRows

getScrollbarVisibility

 public int getScrollbarVisibility()

Gets 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.
See Also:: SCROLLBARS_BOTH, SCROLLBARS_VERTICAL_ONLY, SCROLLBARS_HORIZONTAL_ONLY, SCROLLBARS_NEITHER, TextArea

getPreferredSize

 public Dimension getPreferredSize(int rows,
                                   int columns)

Determines the preferred size of a text area with the specified number of rows and columns.

Parameters:: rows - the number of rows.; cols - the number of columns.
Returns:: the preferred dimensions required to display the text area with the specified number of rows and columns.
See Also:: getPreferredSize

preferredSize

 public Dimension preferredSize(int rows,
                                int columns)

Note: preferredSize() is deprecated. As of JDK version 1.1, replaced by getPreferredSize(int, int).

getPreferredSize

 public Dimension getPreferredSize()

Determines the preferred size of this text area.

Returns:: the preferred dimensions needed for this text area.
Overrides:: getPreferredSize in class Component
See Also:: getPreferredSize

preferredSize

 public Dimension preferredSize()

Note: preferredSize() is deprecated. As of JDK version 1.1, replaced by getPreferredSize().

Overrides:: preferredSize in class Component

getMinimumSize

 public Dimension getMinimumSize(int rows,
                                 int columns)

Determines the minimum size of a text area with the specified number of rows and columns.

Parameters:: rows - the number of rows.; cols - the number of columns.
Returns:: the minimum dimensions required to display the text area with the specified number of rows and columns.
See Also:: getMinimumSize

minimumSize

 public Dimension minimumSize(int rows,
                              int columns)

Note: minimumSize() is deprecated. As of JDK version 1.1, replaced by getMinimumSize(int, int).

getMinimumSize

 public Dimension getMinimumSize()

Determines the minimum size of this text area.

Returns:: the preferred dimensions needed for this text area.
Overrides:: getMinimumSize in class Component
See Also:: getPreferredSize

minimumSize

 public Dimension minimumSize()

Note: minimumSize() is deprecated. As of JDK version 1.1, replaced by getMinimumSize().

Overrides:: minimumSize in class Component

paramString

 protected String paramString()

Returns the parameter string representing the state of this text area. This string is useful for debugging.

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

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