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Class jclass.bwt.JCTextComponent

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

public class JCTextComponent

extends JCComponent

implements JCTextInterface, Runnable

Properties

Name	Method
Alignment	setAlignment
Background	setBackground
CaretPosition	setCaretPosition
Changed	setChanged
Columns	setColumns
CursorPosition	setCursorPosition
DoubleBuffer	setDoubleBuffer
Editable	setEditable
Font	setFont
Foreground	setForeground
HighlightColor	setHighlightColor
HighlightThickness	setHighlightThickness
Insets	setInsets
MaximumLength	setMaximumLength
Overstrike	setOverstrike
PreferredSize	setPreferredSize
SelectedBackground	setSelectedBackground
SelectedForeground	setSelectedForeground
SelectionEnd	setSelectionEnd
SelectionList	setSelectionList
SelectionStart	setSelectionStart
ShadowThickness	setShadowThickness
ShowCursorPosition	setShowCursorPosition
StringCase	setStringCase
Text	setText
Traversable	setTraversable
UserData	setUserData

Events

JCTextCursorEvent

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

See Also:

JCTextArea, JCTextField

CASE_AS_IS

CASE_LOWER

CASE_UPPER

CENTER

cursor_blink_rate

Cursor's blink rate (ms)

cursorListeners

List of JCTextCursorEvent listeners.

horiz_origin

Amount by which the text has been scrolled.

LEFT

RIGHT

SELECT_ALL

SELECT_CHAR

SELECT_LINE

SELECT_PARAGRAPH

SELECT_WORD

valueListeners

List of TextEvent/JCTextEvent listeners.

vert_origin

Amount by which the text has been scrolled.

JCTextComponent()

Creates an empty component.

JCTextComponent(Applet, String)

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

addNotify()

Creates the peer of the canvas.

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.

beep()

Emits a beep.

blinkCursor(boolean)

Enables cursor blinking.

cancelSelection()

Cancels the current selection.

checkCursorPosition(int)

Resets the position to the range [0,num_char]

copyToClipboard(Event)

If text is currently selected, copies the selection to the clipboard.

cutToClipboard(Event)

If text is currently selected, copies the selection to the clipboard and deletes it from the component.

deleteCurrentChar(Event)

Deletes the character at the current cursor position.

deletePreviousChar(Event)

Deletes the character before the current cursor position.

deleteSelection()

Deletes the current selection.

disable()

Disables the component and stops the cursor blinking.

freeze()

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()

Gets the number of columns.

getCursorPosition()

Gets the position of the cursor.

getEditable()

Gets the Editable value.

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.

getNumChar()

Gets the current number of characters.

getOverstrike()

Gets the Overstrike value.

getParameters()

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

getSelectedBackground()

Gets the SelectedBackground value.

getSelectedForeground()

Gets the SelectedForeground value.

getSelectedText()

Get the selected part of the text.

getSelectionEnd()

Returns the end of the selection.

getSelectionList()

Gets the current SelectionList.

getSelectionStart()

Returns the start of the selection.

getSelectionType(int)

Gets the selection type corresponding to the index.

getShowCursorPosition()

Gets the ShowCursorPosition value.

getStringCase()

Gets the StringCase value.

getText()

Gets the value of the text.

gotFocus(Event, Object)

Starts the cursor blinking if the component is editable.

insert(String, int)

Inserts text at the specified position.

insertChar(Event, int)

Inserts a character at the current cursor position.

isEditable()

Gets the Editable value.

isFrozen()

isLineDelimiter(char)

Determines whether a character is a line delimiter.

isWordDelimiter(char)

Determines whether a character is a word delimiter.

keyDown(Event, int)

Processes keyDown events.

lostFocus(Event, Object)

Stops the cursor blinking.

mouseDown(Event, int, int)

Positions the cursor, or if MB2 was pressed, pastes the current clipboard contents.

mouseDrag(Event, int, int)

Selects the text.

mouseUp(Event, int, int)

Ends text selection.

moveBackwardChar(Event)

Moves the cursor backward one character.

moveForwardChar(Event)

Moves the cursor forward one character.

paintCursor(boolean)

Paints or erases the cursor, depending on the value of state.

paste(Event)

Inserts the current clipboard contents at the event's position, after first deleting any selected text.

pasteFromClipboard(Event)

If the component is editable, inserts the clipboard selection at the current cursor position.

pointToPosition(int, int)

Converts an x coordinate into a text position.

positionToPoint(int, Point)

Gets the physical location of a position, ignoring scrolling.

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 1 row.

preferredWidth()

Returns the width of an 'N' times the specified number of columns.

readClipboard()

Gets the clipboard contents.

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.

repaint()

Overrides Component.repaint(), which does not always call paint().

repaintPositions(int, int)

Draws the text between 2 positions.

repaintPositions(Point, Point)

Draws the text between 2 points.

replace(String, int, int)

Deletes the text from start to end and then inserts, at start, the text that was passed.

replaceRange(String, int, int)

Replaces text from the indicated start to end positions (inclusive) with the new text specified.

replaceTextInternal(String, int, int)

Updates the internal text buffer.

reshape(int, int, int, int)

Reshapes the Component to the specified bounding box.

run()

Blinks the cursor.

scrollEnd(Event)

Scrolls to the last line.

scrollHome(Event)

Scrolls to the first line.

scrollLineBegin(Event)

Scrolls to the beginning of the current line.

scrollLineEnd(Event)

Scrolls to the end of the current line.

select(int, int)

Sets the current selection, and sets the cursor at the end of the selection.

select(int, int, int)

Selects part of the text.

selectAll()

Selects all the text, and sets the cursor at the last character.

selectEnd(Event)

Ends the current selection.

selectExtend(Event)

Extends the current selection.

selectStart(Event)

Starts the selection.

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).

setChanged(boolean)

Resets the Changed flag.

setColumns(int)

Sets the number of columns.

HTML param name/value: "Columns"/int

setCursorPosition(int)

Sets the position of the cursor, and posts a JCTextCursorEvent event.

HTML param name/value: "CursorPosition"/int

setEditable(boolean)

If set to true (default), the user can edit the text.

HTML param name/value: "Editable"/boolean

setFont(Font)

Sets the font of the component.

HTML param name/value: "Font"/font

setMaximumLength(int)

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

setOverstrike(boolean)

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

HTML param name/value: "Overstrike"/boolean

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)

Sets the selection end to the specified position.

setSelectionList(int[])

Sets a list of values used for multi-click.

setSelectionStart(int)

Sets the selection start to the specified position.

setShowCursorPosition(boolean)

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

HTML param name/value: "ShowCursorPosition"/boolean

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.

HTML param name/value: "Text"/string

showPosition(int)

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

toggleOverstrike(Event)

Toggles the value of the overstrike flag.

unfreeze()

updateScrollbars()

writeClipboard(String)

Writes to the clipboard.

  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 final static int SELECT_CHAR

  public final static int SELECT_WORD

  public final static int SELECT_LINE

  public final static int SELECT_PARAGRAPH

  public final static int SELECT_ALL

  protected int horiz_origin

Amount by which the text has been scrolled.

  protected int vert_origin

Amount by which the text has been scrolled.

  protected JCVector cursorListeners

List of JCTextCursorEvent listeners.

  protected JCVector valueListeners

List of TextEvent/JCTextEvent listeners.

  protected int cursor_blink_rate

Cursor's blink rate (ms)

  public JCTextComponent()

Creates an empty component.

  public JCTextComponent(Applet applet,
                         String name)

Creates a component 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

  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 JCComponent

  public synchronized void setFont(Font f)

Sets the font of the component.

HTML param name/value: "Font"/font

Overrides:

setFont in class JCComponent

  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 boolean getChanged()

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

  public void setChanged(boolean v)

Resets the Changed flag.

See Also:

getChanged

  public synchronized 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 synchronized int getSelectionStart()

Returns the start of the selection.

See Also:

setSelectionStart

  public synchronized void setSelectionStart(int v)

Sets the selection start to the specified position. The new starting point is constrained to be before or at the current selection end.

  public synchronized int getSelectionEnd()

Returns the end of the selection.

See Also:

setSelectionEnd

  public synchronized void setSelectionEnd(int v)

Sets the selection end to the specified position. The new end point is constrained to be at or after the current selection start.

  public synchronized String getText()

Gets the value of the text.

See Also:

setText

  public synchronized void setText(String text)

Sets the text of this component to the specified text.

HTML param name/value: "Text"/string

See Also:

getText

  public int getNumChar()

Gets the current number of characters.

  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

  protected void deleteSelection()

Deletes the current selection.

  protected void cancelSelection()

Cancels the current selection.

  public synchronized void insert(String text,
                                  int pos)

Inserts text at the specified position.

See Also:

setText, replaceRange

  public synchronized void append(String text)

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

See Also:

insert

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

Replaces text from the indicated start to end positions (inclusive) with the new text specified. The text is first converted according to the StringCase value. The JCTextCursorEvent and JCTextEvent events are then posted. The cursor is moved to the end position.

Parameters:

text - if null, the current text will be deleted

See Also:

insert, setStringCase, addTextCursorListener, addTextListener

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

Updates the internal text buffer.

  protected void updateScrollbars()

  protected boolean replace(String text,
                            int start,
                            int end)

Deletes the text from start to end and then inserts, at start, the text that was passed. The JCTextEvent events are then posted.

Returns:

false if the replacement was disallowed

See Also:

addTextListener

  protected int checkCursorPosition(int pos)

Resets the position to the range [0,num_char]

  public int getCursorPosition()

Gets the position of the cursor.

See Also:

setCursorPosition

  public void setCursorPosition(int pos)

Sets the position of the cursor, and posts a JCTextCursorEvent event.

HTML param name/value: "CursorPosition"/int

Throws: IllegalArgumentException

If the value is less than 0.

See Also:

addTextCursorListener

  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 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.

HTML param name/value: "ShowCursorPosition"/boolean

  public void setOverstrike(boolean v)

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

HTML param name/value: "Overstrike"/boolean

  public boolean getOverstrike()

Gets the Overstrike value.

See Also:

setOverstrike

  public synchronized String getSelectedText()

Get the selected part of the text.

See Also:

select

  public synchronized void selectAll()

Selects all the text, and sets the cursor at the last character.

  public synchronized void select(int start,
                                  int end)

Sets the current selection, and sets the cursor at the end of the selection. If start == end, then the selection is cancelled.

  protected boolean isWordDelimiter(char ch)

Determines whether a character is a word delimiter.

Returns:

false if char is a letter, number, '$' or '_'

  protected boolean isLineDelimiter(char ch)

Determines whether a character is a line delimiter.

Returns:

true if char is a newline or return

  protected void select(int start,
                        int end,
                        int type)

Selects part of the text.

Parameters:

type - SELECT_CHAR, SELECT_WORD, SELECT_LINE, or SELECT_ALL

  public abstract int positionToX(int pos)

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

  public int positionToY(int pos)

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

  public void addTextListener(JCTextListener l)

Adds the specified listener to receive text events.

See Also:

JCTextEvent

  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

  protected void paintCursor(boolean state)

Paints or erases the cursor, depending on the value of state.

  public void run()

Blinks the cursor.

  public synchronized void setEditable(boolean v)

If set to true (default), the user can edit the text.

HTML param name/value: "Editable"/boolean

  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 getColumns()

Gets the number of columns.

See Also:

setColumns

  public void setColumns(int v)

Sets the number of columns.

HTML param name/value: "Columns"/int

Throws: IllegalArgumentException

If the value is less than 0.

  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_CHAR         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_CHAR, SELECT_WORD, SELECT_LINE, SELECT_ALL }

  public boolean getEditable()

Gets the Editable value.

See Also:

setEditable

  public boolean isEditable()

Gets the Editable value.

See Also:

setEditable

  public abstract 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.

  protected int preferredHeight()

Returns the height of 1 row.

Overrides:

preferredHeight in class JCComponent

  protected int preferredWidth()

Returns the width of an 'N' times the specified number of columns.

Overrides:

preferredWidth in class JCComponent

  public void addNotify()

Creates the peer of the canvas.

Overrides:

addNotify in class JCComponent

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

Reshapes the Component to the specified bounding box.

Overrides:

reshape in class JCComponent

  public void repaint()

Overrides Component.repaint(), which does not always call paint().

Overrides:

repaint in class JCComponent

  public abstract int pointToPosition(int x,
                                      int y)

Converts an x coordinate into a text position. The y value is ignored.

  protected Point positionToPoint(int pos,
                                  Point p)

Gets the physical location of a position, ignoring scrolling.

Parameters:

p - point (returned if not null)

Returns:

the location, or null if p is not null

  protected synchronized void repaintPositions(int start,
                                               int end)

Draws the text between 2 positions.

  protected synchronized void repaintPositions(Point p1,
                                               Point p2)

Draws the text between 2 points.

  public void beep()

Emits a beep. For JDK 1.0.2 running in a browser it also flashes it.

  public boolean pasteFromClipboard(Event ev)

If the component is editable, inserts the clipboard selection at the current cursor position.

Returns:

false if the component is not editable

See Also:

readClipboard

  protected synchronized void writeClipboard(String v)

Writes to the clipboard.

  protected String readClipboard()

Gets the clipboard contents.

  public void cutToClipboard(Event ev)

If text is currently selected, copies the selection to the clipboard and deletes it from the component.

See Also:

writeClipboard

  public void copyToClipboard(Event ev)

If text is currently selected, copies the selection to the clipboard.

See Also:

writeClipboard

  protected int getSelectionType(int v)

Gets the selection type corresponding to the index.

See Also:

setSelectionList

  protected void selectStart(Event ev)

Starts the selection.

  protected void selectExtend(Event ev)

Extends the current selection.

  protected void selectEnd(Event ev)

Ends the current selection.

  protected void paste(Event ev)

Inserts the current clipboard contents at the event's position, after first deleting any selected text.

See Also:

pasteFromClipboard

  protected void freeze()

  protected void unfreeze()

  protected boolean isFrozen()

  public boolean mouseDown(Event ev,
                           int x,
                           int y)

Positions the cursor, or if MB2 was pressed, pastes the current clipboard contents.

Overrides:

mouseDown in class JCComponent

See Also:

pasteFromClipboard, selectStart

  public boolean mouseDrag(Event ev,
                           int x,
                           int y)

Selects the text.

Overrides:

mouseDrag in class Component

See Also:

selectExtend

  public boolean mouseUp(Event ev,
                         int x,
                         int y)

Ends text selection.

Overrides:

mouseUp in class Component

See Also:

selectEnd

  protected void scrollHome(Event ev)

Scrolls to the first line.

  protected void scrollEnd(Event ev)

Scrolls to the last line.

  protected void scrollLineEnd(Event ev)

Scrolls to the end of the current line.

  protected void scrollLineBegin(Event ev)

Scrolls to the beginning of the current line.

  protected void moveForwardChar(Event ev)

Moves the cursor forward one character. If the Shift key is pressed, the selection is extended.

  protected void moveBackwardChar(Event ev)

Moves the cursor backward one character. If the Shift key is pressed, the selection is extended.

  protected boolean insertChar(Event ev,
                               int key)

Inserts a character at the current cursor position.

Returns:

false if the insertion was disallowed

  protected boolean deletePreviousChar(Event ev)

Deletes the character before the current cursor position.

Returns:

false if the deletion was disallowed

  protected boolean deleteCurrentChar(Event ev)

Deletes the character at the current cursor position.

Returns:

false if the deletion was disallowed

  protected void toggleOverstrike(Event ev)

Toggles the value of the overstrike flag.

  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
RIGHT       moveForwardChar
LEFT        moveBackwardChar
BS          deletePreviousChar
DELETE      deleteCurrentChar
any other   insertChar

Overrides:

keyDown in class Component

  protected void blinkCursor(boolean on)

Enables cursor blinking. No action is taken if the component does not have focus, is not editable, or if the cursor is already blinking. This method is called by gotFocus and lostFocus.

Parameters:

on - if true, start cursor blinking; otherwise disable it and don't display the cursor

  public boolean gotFocus(Event ev,
                          Object what)

Starts the cursor blinking if the component is editable.

Overrides:

gotFocus in class JCComponent

See Also:

blinkCursor

  public boolean lostFocus(Event ev,
                           Object what)

Stops the cursor blinking.

Overrides:

lostFocus in class JCComponent

See Also:

blinkCursor

  public synchronized void disable()

Disables the component and stops the cursor blinking.

Overrides:

disable in class JCComponent

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