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Class jclass.bwt.JCTextAreaComponent

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----jclass.bwt.JCComponent
                           |
                           +----jclass.bwt.JCTextComponent
                                   |
                                   +----jclass.bwt.JCTextAreaComponent

public class JCTextAreaComponent

extends JCTextComponent

implements JCScrollableInterface

See Also:

JCTextArea

scrolled_window

Parent window.

update_scrollbars

visible_rows

The number of visible lines.

JCTextAreaComponent()

Creates an empty, editable field with 5 rows and 20 columns.

JCTextAreaComponent(Applet, String, int, int)

Creates an editable 5-row by 20-column field with the text from the specified file.

JCTextAreaComponent(String)

Creates an editable field with the specified text and 5 rows and 20 columns.

JCTextAreaComponent(String, Applet, String)

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

JCTextAreaComponent(String, int, int)

Creates an editable field with the specified text and number of columns.

addNotify()

Creates the peer of the canvas.

appendRow(String)

Appends a row of text.

buildLineTable()

Scans the text and adds it to the line table.

checkWidestRow(int)

Checks whether the specified row is the widest.

countRows()

findWidestRow()

Finds the width of the widest row (pixels).

getBounds(int, boolean)

Gets the bounding rectangle of a row, or null if the row is invalid.

getCurrentFirstPosition()

getCurrentRow()

getDoubleBufferGraphics()

Creates a double-buffer image, for subsequent retrieval via getDoubleBufferImage

getDoubleBufferImage()

Returns the double-buffer image previously created in a call to getDoubleBufferGraphics.

getFirstPosition(int)

Gets the text position of the first char in the row.

getHorizOrigin()

Gets the horizontal origin.

getLine(int)

Gets the line for the row.

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.

getNumChar(int)

Returns the number of characters in a row.

getParameters()

Reads the parameter values from the HTML page using the component's applet.

getRowHeight(int)

Gets the height of a row.

getRowPosition(int)

Gets the y position of the row, neglecting shadows and scrolling.

getRows()

Gets the number of rows.

getText(int)

Gets the text for a row, or null if the row is invalid.

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.

getVertOrigin()

Gets the vertical origin.

getVisibleRows()

Gets the number of visible rows.

getWidestRow()

Gets the width of the widest row (pixels).

getWidth(int)

Returns the width of a row (pixels).

insertNewLine(Event)

Inserts a newline.

invalidate()

Invalidates the component.

keyDown(Event, int)

Processes keyDown events.

maxLines(int)

moveNextLine(Event)

Moves the cursor to the next line.

movePreviousLine(Event)

Moves the cursor to the previous line.

paintComponent(Graphics)

Draws the text

pointToPosition(int, int)

Maps a point to a text position.

positionToRow(int)

Gets the row that contains the text position.

positionToX(int)

Gets the x co-ordinate for a character position, ignoring scrolling.

positionToY(int)

Gets the y co-ordinate for a character position, ignoring scrolling.

preferredHeight()

Returns the height of the specified number of rows.

readFile(Applet, String)

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

readFile(InputStream)

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

repaintPositions(Point, Point)

Draws the text between 2 points.

replaceTextInternal(String, int, int)

Updates the internal text buffer and the line table entry.

reshape(int, int, int, int)

Reshapes the Component to the specified bounding box.

scrollLineBegin(Event)

Scrolls to the beginning of the current line.

scrollLineEnd(Event)

Scrolls to the end of the current line.

scrollNextPage(Event)

Scrolls down vertically by a page.

scrollPreviousPage(Event)

Scrolls up vertically by a page.

setDoubleBuffer(boolean)

Controls whether double-buffering is used when displaying and updating the component.

HTML param name/value: "DoubleBuffer"/boolean

setHorizOrigin(int)

Sets the horizontal origin prior to scrolling.

setInsets(Insets)

Sets the spacing between the text and the edge of the component.

setMultiline(boolean)

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

HTML param name/value: "Multiline"/boolean

setRows(int)

Sets the number of rows.

HTML param name/value: "Rows"/int

setTopCharacter(int)

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

setTopRow(int)

Sets the top-most visible row.

setVertOrigin(int)

Sets the top row prior to scrolling.

showPosition(int)

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

updateScrollbars()

yToRow(int)

Finds the row specified by the point.

  protected transient JCScrolledWindow scrolled_window

Parent window.

  protected boolean update_scrollbars

  protected int visible_rows

The number of visible lines.

  public JCTextAreaComponent()

Creates an empty, editable field with 5 rows and 20 columns.

  public JCTextAreaComponent(String text)

Creates an editable field with the specified text and 5 rows and 20 columns.

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

Creates an editable field with the specified text and number of columns.

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

Creates an editable 5-row by 20-column 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

  protected void getParameters()

Reads the parameter values from the HTML page using the component's applet. The values will override those previously set.

Overrides:

getParameters in class JCTextComponent

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

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

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 setDoubleBuffer(boolean v)

Controls whether double-buffering is used when displaying and updating the component.

HTML param name/value: "DoubleBuffer"/boolean

Overrides:

setDoubleBuffer in class JCComponent

  public void invalidate()

Invalidates the component.

Overrides:

invalidate in class Component

  public Image getDoubleBufferImage()

Returns the double-buffer image previously created in a call to getDoubleBufferGraphics.

Overrides:

getDoubleBufferImage in class JCComponent

  public synchronized Graphics getDoubleBufferGraphics()

Creates a double-buffer image, for subsequent retrieval via getDoubleBufferImage

Overrides:

getDoubleBufferGraphics in class JCComponent

  public void appendRow(String text)

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

  public void setInsets(Insets v)

Sets the spacing between the text and the edge of the component.

Overrides:

setInsets in class JCComponent

  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 void setMultiline(boolean v)

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

HTML param name/value: "Multiline"/boolean

  public boolean getMultiline()

Gets the Multiline value.

See Also:

setMultiline

  public int getRows()

Gets the number of rows.

See Also:

setRows

  public void setRows(int r)

Sets the number of rows.

HTML param name/value: "Rows"/int

Throws: IllegalArgumentException

If the value is less than 0.

  protected int preferredHeight()

Returns the height of the specified number of rows.

Overrides:

preferredHeight in class JCTextComponent

  public Dimension getMinimumSize(int columns)

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

Overrides:

getMinimumSize in class JCTextComponent

  public Dimension getMinimumSize(int rows,
                                  int columns)

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

  protected int maxLines(int height)

  public synchronized void reshape(int x,
                                   int y,
                                   int width,
                                   int height)

Reshapes the Component to the specified bounding box.

Overrides:

reshape in class JCTextComponent

  public void addNotify()

Creates the peer of the canvas.

Overrides:

addNotify in class JCTextComponent

  protected void updateScrollbars()

Overrides:

updateScrollbars in class JCTextComponent

  protected void buildLineTable()

Scans the text and adds it to the line table.

  protected synchronized void replaceTextInternal(String str,
                                                  int start,
                                                  int end)

Updates the internal text buffer and the line table entry.

Overrides:

replaceTextInternal in class JCTextComponent

  public int positionToX(int pos)

Gets the x co-ordinate for a character position, ignoring scrolling.

Overrides:

positionToX in class JCTextComponent

  public int positionToY(int pos)

Gets the y co-ordinate for a character position, ignoring scrolling.

Overrides:

positionToY in class JCTextComponent

  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.

Overrides:

showPosition in class JCTextComponent

  protected int getRowHeight(int row)

Gets the height of a row.

  protected int getRowPosition(int row)

Gets the y position of the row, neglecting shadows and scrolling.

  public int yToRow(int y)

Finds the row specified by the point.

Returns:

BWTEnum.NOTFOUND if the text area has not been added to a container

  protected synchronized void paintComponent(Graphics gc)

Draws the text

Overrides:

paintComponent in class JCComponent

  public Rectangle getBounds(int row,
                             boolean adjust)

Gets the bounding rectangle of a row, or null if the row is invalid.

Parameters:

adjust - if true, the co-ordinates are adjusted by the amount that the field has been scrolled.

  protected synchronized void repaintPositions(Point p1,
                                               Point p2)

Draws the text between 2 points.

Overrides:

repaintPositions in class JCTextComponent

  protected int getNumChar(int row)

Returns the number of characters in a row.

  protected int getWidth(int row)

Returns the width of a row (pixels).

  public int getVisibleRows()

Gets the number of visible rows.

  public String getText(int row)

Gets the text for a row, or null if the row is invalid.

  protected TextLine getLine(int row)

Gets the line for the row.

  protected int getFirstPosition(int row)

Gets the text position of the first char in the row.

  protected int positionToRow(int pos)

Gets the row that contains the text position.

  protected int getWidestRow()

Gets the width of the widest row (pixels).

  protected void checkWidestRow(int row)

Checks whether the specified row is the widest.

  protected void findWidestRow()

Finds the width of the widest row (pixels).

  protected int countRows()

  protected int getCurrentRow()

  protected int getCurrentFirstPosition()

  public int pointToPosition(int x,
                             int y)

Maps a point to a text position.

Overrides:

pointToPosition in class JCTextComponent

  protected void scrollLineEnd(Event ev)

Scrolls to the end of the current line.

Overrides:

scrollLineEnd in class JCTextComponent

  protected void scrollLineBegin(Event ev)

Scrolls to the beginning of the current line.

Overrides:

scrollLineBegin in class JCTextComponent

  protected void moveNextLine(Event ev)

Moves the cursor to the next line. If the Shift key is pressed, the selection is extended.

  protected void movePreviousLine(Event ev)

Moves the cursor to the previous line. If the Shift key is pressed, the selection is extended.

  protected void scrollNextPage(Event ev)

Scrolls down vertically by a page.

  protected void scrollPreviousPage(Event ev)

Scrolls up vertically by a page.

  protected boolean insertNewLine(Event ev)

Inserts a newline.

Returns:

false if the insertion was disallowed

  public boolean keyDown(Event ev,
                         int key)

Processes keyDown events.

CTRL/A      scrollHome
CTRL/D      deleteCurrentChar
CTRL/E      scrollEnd
CTRL/O      toggleOverstrike
CTRL/C      copyToClipboard
CTRL/X      cutToClipboard
CTRL/V      pasteFromClipboard
HOME        scrollHome
END         scrollEnd
PAGE-UP     scrollPreviousPage
PAGE-DOWN   scrollNextPage
UP          movePreviousLine
DOWN        moveNextLine
RIGHT       moveForwardChar
LEFT        moveBackwardChar
BS          deletePreviousChar
DELETE      deleteCurrentChar
ENTER       insertNewLine
any other   insertChar

Overrides:

keyDown in class JCTextComponent

  public int getHorizOrigin()

Gets the horizontal origin.

  public void setHorizOrigin(int v)

Sets the horizontal origin prior to scrolling.

  public int getVertOrigin()

Gets the vertical origin.

  public void setVertOrigin(int value)

Sets the top row prior to scrolling.

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