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Class jclass.bwt.JCTextArea

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----jclass.bwt.JCContainer
                                   |
                                   +----jclass.bwt.JCScrolledWindow
                                           |
                                           +----jclass.bwt.JCTextArea

public class JCTextArea

extends JCScrolledWindow

implements JCTextAreaInterface

Properties

Name	Method
Alignment	setAlignment
Background	setBackground
CaretPosition	setCaretPosition
Columns	setColumns
CursorPosition	setCursorPosition
Editable	setEditable
Font	setFont
Foreground	setForeground
Insets	setInsets
MaximumLength	setMaximumLength
Multiline	setMultiline
Overstrike	setOverstrike
PreferredSize	setPreferredSize
Rows	setRows
ScrollbarDisplay	setScrollbarDisplay
ScrollbarOffset	setScrollbarOffset
SelectedBackground	setSelectedBackground
SelectedForeground	setSelectedForeground
SelectionEnd	setSelectionEnd
SelectionList	setSelectionList
SelectionStart	setSelectionStart
ShadowThickness	setShadowThickness
ShowCursorPosition	setShowCursorPosition
StringCase	setStringCase
Text	setText
TopCharacter	setTopCharacter
TopRow	setTopRow
Traversable	setTraversable
UserData	setUserData

Events

JCTextCursorEvent

Class	Listener	Description
JCTextEvent	addTextListener	Posted when the value changes
addTextCursorListener	Posted when the cursor is moved

CASE_AS_IS

CASE_LOWER

CASE_UPPER

CENTER

LEFT

RIGHT

JCTextArea()

Creates an empty JCTextArea with 5 rows and 20 columns.

JCTextArea(Applet, String, int, int)

Creates an editable field with the text from the specified file.

JCTextArea(String)

Creates a new JCTextArea with the specified text and 5 rows by 20 columns.

JCTextArea(String, Applet, String)

Creates a TextArea which reads parameters from the applet's HTML file.

JCTextArea(String, int, int)

Creates a new JCTextArea with the specified text and number of rows and columns.

JCTextArea(String, int, int, int)

Constructs a new TextArea with the specified text and number of rows, columns, and scrollbar visibility.

addTextCursorListener(JCTextCursorListener)

Adds the specified JCTextCursorEvent listener to receive cursor movement events.

addTextListener(JCTextListener)

Adds the specified listener to receive text events.

append(String)

Appends text to the end.

appendRow(String)

Appends a row of text.

beep()

Emits a beep.

getAlignment()

Gets the field's alignment.

getCaretPosition()

Gets the position of the cursor (provided for JDK 1.1 compatibility).

getChanged()

Returns true if the user has changed the value since the last programmatic setting.

getColumns()

Returns the number of columns.

getCursorPosition()

Gets the position of the cursor.

getEditable()

Returns the boolean indicating whether this component is editable or not.

getLastPosition()

Gets the position of the last character in the text.

getMaximumLength()

Gets the MaximumLength value.

getMinimumSize(int)

Returns the minimum size needed for the specified number of columns.

getMinimumSize(int, int)

Returns the minimum size needed for the specified number of rows and columns.

getMultiline()

Gets the Multiline value.

getOverstrike()

Gets the Overstrike value.

getRows()

Returns the number of rows.

getSelectedBackground()

Gets the SelectedBackground value.

getSelectedForeground()

Gets the SelectedForeground value.

getSelectedText()

Returns the selected text contained in this component.

getSelectionEnd()

Returns the selected text's end position.

getSelectionList()

Gets the current SelectionList.

getSelectionStart()

Returns the selected text's start position.

getShadowThickness()

Gets the shadow's thickness.

HTML param name/value: "ShadowThickness"/int

getShowCursorPosition()

Gets the ShowCursorPosition value.

getStringCase()

Gets the StringCase value.

getText()

Returns the text contained in this component.

getTextComponent()

Gets the internal text area.

getTopCharacter()

Gets the position of the leftmost character on the first line currently displayed, or 0 if the component is empty.

getTopRow()

Gets the current top-most visible row.

getViewportHeight()

Sets the work area height to be the text area's virtual height.

getViewportWidth()

Sets the work area width to be the text's virtual width.

gotFocus(Event, Object)

insert(String, int)

Inserts text at the specified position.

isEditable()

Returns the boolean indicating whether this component is editable or not.

isFocusTraversable()

Returns whether this component can be traversed using Tab or Shift-Tab keyboard focus traversal.

isTraversable()

Returns true if the component can accept focus - it must be traversable, showing, and enabled.

pointToPosition(int, int)

Maps a physical position to the corresponding character position.

readFile(Applet, String)

Reads data from a file and appends it to the textarea.

readFile(InputStream)

Reads data from a file stream and appends it to the textarea.

removeTextCursorListener(JCTextCursorListener)

Removes the specified listener so it no longer receives JCTextCursorEvents.

removeTextListener(JCTextListener)

Removes the specified text listener so it no longer receives text events.

replaceRange(String, int, int)

Replaces the existing text between two positions with the specified text.

scrollVertical(int)

Scrolls the window vertically to the specified row.

scrollVertical(JCScrollableInterface, JCAdjustmentEvent, int)

Scrolls a scrollableInterface component vertically.

select(int, int)

Selects the text found between the specified start and end locations.

selectAll()

Selects all the text in the component.

setAlignment(int)

Sets the position of the text:
LEFT (default), CENTER, or RIGHT.

setCaretPosition(int)

Sets the position of the cursor (provided for JDK 1.1 compatibility).

setColumns(int)

Sets the number of columns.

setCursorPosition(int)

Sets the position of the cursor.

setEditable(boolean)

Determines whether this component is editable.

setHorizScrollbarValues(int, int, int, int)

This method may be overriden by a subclass to set the horizontal scrollbar's values.

setMaximumLength(int)

Sets the maximum number of characters which may be entered by the user (default: BWTEnum.MAXINT).

setMultiline(boolean)

If true (default), the user can break text into multiple lines by hitting Enter.

setOverstrike(boolean)

If false (default), characters typed by the user are inserted into the current text.

setRows(int)

Sets the number of rows.

setSelectedBackground(Color)

Sets the background color of selected text (default: blue).

HTML param name/value: "SelectedBackground"/color

setSelectedForeground(Color)

Sets the foreground color of selected text (default: background color).

HTML param name/value: "SelectedForeground"/color

setSelectionEnd(int)

Gets the selected text's end position.

setSelectionList(int[])

Sets a list of values used for multi-click.

setSelectionStart(int)

Gets the selected text's start position.

setShadowThickness(int)

Sets the shadow's thickness (default: 2)

setShowCursorPosition(boolean)

If set to true (default), the cursor position will be indicated with a vertical I-beam.

setStringCase(int)

Sets the case of text entered by the user or set programmatically:

CASE_AS_IS       No conversion (default)
CASE_LOWER       Convert to lower case
CASE_UPPER       Convert to upper case

HTML param name/value: "StringCase"/enum

setText(String)

Sets the text of this component to the specified text.

setTextComponent(JCTextAreaComponent)

Replaces the current internal text component.

setTopCharacter(int)

Sets the position of the leftmost character on the first line currently displayed.

setTopRow(int)

Sets the top-most visible row.

setTraversable(boolean)

Sets whether the component can accept focus (default: true).

HTML param name/value: "Traversable"/boolean

setVertScrollbarValues(int, int, int, int)

This method may be overriden by a subclass to set the vertical scrollbar's values.

showPosition(int)

Scrolls the text if necessary to ensure that the position is visible.

  public final static int LEFT

  public final static int CENTER

  public final static int RIGHT

  public final static int CASE_AS_IS

  public final static int CASE_LOWER

  public final static int CASE_UPPER

  public JCTextArea()

Creates an empty JCTextArea with 5 rows and 20 columns. No parameters are read from an HTML file.

  public JCTextArea(String text)

Creates a new JCTextArea with the specified text and 5 rows by 20 columns. No parameters are read from an HTML file.

  public JCTextArea(String text,
                    int rows,
                    int cols)

Creates a new JCTextArea with the specified text and number of rows and columns. No parameters are read from an HTML file.

  public JCTextArea(String text,
                    int rows,
                    int columns,
                    int sb_display)

Constructs a new TextArea with the specified text and number of rows, columns, and scrollbar visibility.

Parameters:

sb_display - the visibility of scrollbars

See Also:

setScrollbarDisplay

  public JCTextArea(String text,
                    Applet applet,
                    String name)

Creates a TextArea which reads parameters from the applet's HTML file.

Parameters:

applet - the applet whose PARAM tags are to be read

name - if this is not null, only parameters preceded by this name are read

See Also:

getParameter, JCString

  public JCTextArea(Applet applet,
                    String file,
                    int rows,
                    int cols) throws IOException

Creates an editable field with the text from the specified file.

Parameters:

applet - if not null, its documentBase() is used to construct a complete filename if necessary.

file - the file to be read. If an http protocol is not specified (a ":" is not present), the current working directory is prepended to the file name

rows,cols - the number of rows and columns to display

Throws: IOException

If an I/O error has occurred.

See Also:

readFile

  public JCTextAreaComponent getTextComponent()

Gets the internal text area.

  public void setTextComponent(JCTextAreaComponent text)

Replaces the current internal text component.

  protected int getViewportWidth()

Sets the work area width to be the text's virtual width.

Overrides:

getViewportWidth in class JCScrolledWindow

  protected int getViewportHeight()

Sets the work area height to be the text area's virtual height.

Overrides:

getViewportHeight in class JCScrolledWindow

  protected void setHorizScrollbarValues(int value,
                                         int visible,
                                         int min,
                                         int max)

This method may be overriden by a subclass to set the horizontal scrollbar's values.

Overrides:

setHorizScrollbarValues in class JCScrolledWindow

  protected void setVertScrollbarValues(int value,
                                        int visible,
                                        int min,
                                        int max)

This method may be overriden by a subclass to set the vertical scrollbar's values.

Overrides:

setVertScrollbarValues in class JCScrolledWindow

  protected void scrollVertical(JCScrollableInterface scrollable,
                                JCAdjustmentEvent ev,
                                int value)

Scrolls a scrollableInterface component vertically.

Overrides:

scrollVertical in class JCScrolledWindow

  public void scrollVertical(int row)

Scrolls the window vertically to the specified row.

Overrides:

scrollVertical in class JCScrolledWindow

  public Dimension getMinimumSize(int columns)

Returns the minimum size needed for the specified number of columns.

  public Dimension getMinimumSize(int rows,
                                  int columns)

Returns the minimum size needed for the specified number of rows and columns.

  public boolean getChanged()

Returns true if the user has changed the value since the last programmatic setting.

  public void beep()

Emits a beep.

  public void addTextListener(JCTextListener l)

Adds the specified listener to receive text events.

See Also:

JCTextEvent, JCTextListener

  public void removeTextListener(JCTextListener l)

Removes the specified text listener so it no longer receives text events.

  public void addTextCursorListener(JCTextCursorListener l)

Adds the specified JCTextCursorEvent listener to receive cursor movement events.

See Also:

JCTextCursorEvent

  public void removeTextCursorListener(JCTextCursorListener l)

Removes the specified listener so it no longer receives JCTextCursorEvents.

See Also:

addTextCursorListener

  public void readFile(Applet applet,
                       String file) throws IOException

Reads data from a file and appends it to the textarea.

Parameters:

applet - if not null, its documentBase() is used to construct a complete filename if necessary.

file - the file to be read. If an http protocol is not specified (a ":" is not present), the current working directory is prepended to the file name

Throws: IOException

If an I/O error has occurred.

  public void readFile(InputStream stream) throws IOException

Reads data from a file stream and appends it to the textarea.

Throws: IOException

If an I/O error has occurred.

  public void setText(String t)

Sets the text of this component to the specified text.

See Also:

getText

  public String getText()

Returns the text contained in this component.

See Also:

setText

  public String getSelectedText()

Returns the selected text contained in this component.

See Also:

setText

  public int getMaximumLength()

Gets the MaximumLength value.

See Also:

setMaximumLength

  public void setMaximumLength(int v)

Sets the maximum number of characters which may be entered by the user (default: BWTEnum.MAXINT). If the user attempts to enter more characters, the values will be ignored and the bell will be sounded. This value is ignored for values set programmatically.

HTML param name/value: "MaximumLength"/int

See Also:

setText

  public int getStringCase()

Gets the StringCase value.

See Also:

setStringCase

  public void setStringCase(int v)

Sets the case of text entered by the user or set programmatically:

CASE_AS_IS       No conversion (default)
CASE_LOWER       Convert to lower case
CASE_UPPER       Convert to upper case

HTML param name/value: "StringCase"/enum

Throws: IllegalArgumentException

If an invalid value is set

  public boolean isEditable()

Returns the boolean indicating whether this component is editable or not.

See Also:

setEditable

  public boolean getEditable()

Returns the boolean indicating whether this component is editable or not.

See Also:

setEditable

  public void setEditable(boolean t)

Determines whether this component is editable.

See Also:

isEditable

  public int getSelectionStart()

Returns the selected text's start position.

  public int getSelectionEnd()

Returns the selected text's end position.

  public void setSelectionStart(int pos)

Gets the selected text's start position.

  public void setSelectionEnd(int pos)

Gets the selected text's end position.

  public void select(int start,
                     int end)

Selects the text found between the specified start and end locations.

  public void selectAll()

Selects all the text in the component.

  public void insert(String str,
                     int pos)

Inserts text at the specified position.

See Also:

setText, replaceRange

  public void append(String str)

Appends text to the end. The cursor is moved to the end of the text.

See Also:

insert

  public void appendRow(String str)

Appends a row of text. The cursor is moved to the end of the text.

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

Replaces the existing text between two positions with the specified text.

See Also:

insert

  public int[] getSelectionList()

Gets the current SelectionList.

See Also:

setSelectionList

  public void setSelectionList(int list[])

Sets a list of values used for multi-click. As the mouse is clicked in rapid succession, each click selects the next type in the list. Valid values (in order of the default list):

 SELECT_POSITION     Selects the current pointer position
 SELECT_WORD         Selects the current word
 SELECT_LINE         Selects the current line
 SELECT_ALL          Selects all the text
 

Default list: { SELECT_POSITION, SELECT_WORD, SELECT_LINE, SELECT_ALL }

  public void setMultiline(boolean v)

If true (default), the user can break text into multiple lines by hitting Enter.

  public boolean getMultiline()

Gets the Multiline value.

See Also:

setMultiline

  public int getRows()

Returns the number of rows.

See Also:

setRows

  public int getColumns()

Returns the number of columns.

See Also:

setColumns

  public void setRows(int v)

Sets the number of rows. The component will attempt to resize itself to display this number of lines in the current font.

Throws: IllegalArgumentException

If the value is less than 0.

  public void setColumns(int v)

Sets the number of columns. The component will attempt to resize itself to display this number of N's in the current font.

Throws: IllegalArgumentException

If the value is less than 0.

  public Color getSelectedBackground()

Gets the SelectedBackground value.

See Also:

setSelectedBackground

  public void setSelectedBackground(Color v)

Sets the background color of selected text (default: blue).

HTML param name/value: "SelectedBackground"/color

See Also:

toColor

  public Color getSelectedForeground()

Gets the SelectedForeground value.

See Also:

setSelectedForeground

  public void setSelectedForeground(Color v)

Sets the foreground color of selected text (default: background color).

HTML param name/value: "SelectedForeground"/color

See Also:

toColor

  public int pointToPosition(int x,
                             int y)

Maps a physical position to the corresponding character position.

  public void showPosition(int pos)

Scrolls the text if necessary to ensure that the position is visible.

Parameters:

pos - the number of characters from the beginning of the text buffer.

  public int getTopRow()

Gets the current top-most visible row.

See Also:

setTopRow

  public void setTopRow(int row)

Sets the top-most visible row.

  public int getTopCharacter()

Gets the position of the leftmost character on the first line currently displayed, or 0 if the component is empty.

See Also:

setTopCharacter

  public void setTopCharacter(int pos)

Sets the position of the leftmost character on the first line currently displayed. This is the number of characters from the beginning of the text buffer. The first character position is 0.

See Also:

setTopRow

  public int getCursorPosition()

Gets the position of the cursor.

See Also:

setCursorPosition

  public void setCursorPosition(int pos)

Sets the position of the cursor.

  public void setOverstrike(boolean v)

If false (default), characters typed by the user are inserted into the current text.

  public boolean getOverstrike()

Gets the Overstrike value.

See Also:

setOverstrike

  public int getLastPosition()

Gets the position of the last character in the text. This represents the position that text appended to the component would be placed after.

  public boolean getShowCursorPosition()

Gets the ShowCursorPosition value.

See Also:

setShowCursorPosition

  public void setShowCursorPosition(boolean v)

If set to true (default), the cursor position will be indicated with a vertical I-beam.

  public int getAlignment()

Gets the field's alignment.

See Also:

setAlignment

  public void setAlignment(int v)

Sets the position of the text:
LEFT (default), CENTER, or RIGHT. HTML param name/value: "Alignment"/enum

Throws: IllegalArgumentException

If an invalid value is set

  public int getCaretPosition()

Gets the position of the cursor (provided for JDK 1.1 compatibility).

See Also:

getCursorPosition

  public void setCaretPosition(int pos)

Sets the position of the cursor (provided for JDK 1.1 compatibility).

See Also:

setCursorPosition

  public boolean gotFocus(Event ev,
                          Object what)

Overrides:

gotFocus in class Component

  public int getShadowThickness()

Gets the shadow's thickness.

HTML param name/value: "ShadowThickness"/int

See Also:

setShadowThickness

  public void setShadowThickness(int v)

Sets the shadow's thickness (default: 2)

  public boolean isTraversable()

Returns true if the component can accept focus - it must be traversable, showing, and enabled.

See Also:

setTraversable, isEnabled, isShowing

  public boolean isFocusTraversable()

Returns whether this component can be traversed using Tab or Shift-Tab keyboard focus traversal.

Overrides:

isFocusTraversable in class Component

See Also:

setTraversable

  public void setTraversable(boolean v)

Sets whether the component can accept focus (default: true).

HTML param name/value: "Traversable"/boolean

See Also:

toBoolean

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