Module java.desktop

Package javax.swing.text

Class DefaultStyledDocument

java.lang.Object

javax.swing.text.AbstractDocument

javax.swing.text.DefaultStyledDocument

All Implemented Interfaces:

Serializable, Document, StyledDocument

Direct Known Subclasses:

HTMLDocument

public class DefaultStyledDocument
extends AbstractDocument
implements StyledDocument

A document that can be marked up with character and paragraph styles in a manner similar to the Rich Text Format. The element structure for this document represents style crossings for style runs. These style runs are mapped into a paragraph element structure (which may reside in some other structure). The style runs break at paragraph boundaries since logical styles are assigned to paragraph boundaries.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see XMLEncoder.

See Also:

• Document
• AbstractDocument

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DefaultStyledDocument.AttributeUndoableEdit	An UndoableEdit used to remember AttributeSet changes to an Element.
class	DefaultStyledDocument.ElementBuffer	Class to manage changes to the element hierarchy.
static class	DefaultStyledDocument.ElementSpec	Specification for building elements.
protected class	DefaultStyledDocument.SectionElement	Default root element for a document... maps out the paragraphs/lines contained.

Nested classes/interfaces declared in class javax.swing.text.AbstractDocument

AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement

Field Summary

Fields

Modifier and Type	Field	Description
protected DefaultStyledDocument.ElementBuffer	buffer	The element buffer.
static final int	BUFFER_SIZE_DEFAULT	The default size of the initial content buffer.

Fields declared in class javax.swing.text.AbstractDocument

BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName

Fields declared in interface javax.swing.text.Document

StreamDescriptionProperty, TitleProperty

Constructor Summary

Constructors

Constructor	Description
DefaultStyledDocument()	Constructs a default styled document.
DefaultStyledDocument(AbstractDocument.Content c, StyleContext styles)	Constructs a styled document.
DefaultStyledDocument(StyleContext styles)	Constructs a styled document with the default content storage implementation and a shared set of styles.

Method Summary

Modifier and Type	Method	Description
void	addDocumentListener(DocumentListener listener)	Adds a document listener for notification of any changes.
Style	addStyle(String nm, Style parent)	Adds a new style into the logical style hierarchy.
protected void	create(DefaultStyledDocument.ElementSpec[] data)	Initialize the document to reflect the given element structure (i.e. the structure reported by the getDefaultRootElement method.
protected AbstractDocument.AbstractElement	createDefaultRoot()	Creates the root element to be used to represent the default document structure.
Color	getBackground(AttributeSet attr)	Gets the background color from an attribute set.
Element	getCharacterElement(int pos)	Gets a character element based on a position.
Element	getDefaultRootElement()	Gets the default root element.
Font	getFont(AttributeSet attr)	Gets the font from an attribute set.
Color	getForeground(AttributeSet attr)	Gets the foreground color from an attribute set.
Style	getLogicalStyle(int p)	Fetches the logical style assigned to the paragraph represented by the given position.
Element	getParagraphElement(int pos)	Gets the paragraph element at the offset pos.
Style	getStyle(String nm)	Fetches a named style previously added.
Enumeration<?>	getStyleNames()	Fetches the list of style names.
protected void	insert(int offset, DefaultStyledDocument.ElementSpec[] data)	Inserts new elements in bulk.
protected void	insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)	Updates document structure as a result of text insertion.
void	removeDocumentListener(DocumentListener listener)	Removes a document listener.
void	removeElement(Element elem)	Removes an element from this document.
void	removeStyle(String nm)	Removes a named style previously added to the document.
protected void	removeUpdate(AbstractDocument.DefaultDocumentEvent chng)	Updates document structure as a result of text removal.
void	setCharacterAttributes(int offset, int length, AttributeSet s, boolean replace)	Sets attributes for some part of the document.
void	setLogicalStyle(int pos, Style s)	Sets the logical style to use for the paragraph at the given position.
void	setParagraphAttributes(int offset, int length, AttributeSet s, boolean replace)	Sets attributes for a paragraph.
protected void	styleChanged(Style style)	Called when any of this document's styles have changed.

Methods declared in class javax.swing.text.AbstractDocument

addUndoableEditListener, createBranchElement, createLeafElement, createPosition, dump, fireChangedUpdate, fireInsertUpdate, fireRemoveUpdate, fireUndoableEditUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods declared in interface javax.swing.text.Document

addUndoableEditListener, createPosition, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, putProperty, remove, removeUndoableEditListener, render

Field Details

BUFFER_SIZE_DEFAULT

public static final int BUFFER_SIZE_DEFAULT

The default size of the initial content buffer.

See Also:

• Constant Field Values

buffer

protected DefaultStyledDocument.ElementBuffer buffer

The element buffer.

Constructor Details

DefaultStyledDocument

public DefaultStyledDocument(AbstractDocument.Content c,
 StyleContext styles)

Constructs a styled document.

Parameters:

c - the container for the content

styles - resources and style definitions which may be shared across documents

DefaultStyledDocument

public DefaultStyledDocument(StyleContext styles)

Constructs a styled document with the default content storage implementation and a shared set of styles.

Parameters:

styles - the styles

DefaultStyledDocument

public DefaultStyledDocument()

Constructs a default styled document. This buffers input content by a size of BUFFER_SIZE_DEFAULT and has a style context that is scoped by the lifetime of the document and is not shared with other documents.

Method Details

getDefaultRootElement

public Element getDefaultRootElement()

Gets the default root element.

Specified by:

getDefaultRootElement in interface Document

Specified by:

getDefaultRootElement in class AbstractDocument

Returns:

the root

See Also:

• Document.getDefaultRootElement()

create

protected void create(DefaultStyledDocument.ElementSpec[] data)

Initialize the document to reflect the given element structure (i.e. the structure reported by the getDefaultRootElement method. If the document contained any data it will first be removed.

Parameters:

data - the element data

insert

protected void insert(int offset,
 DefaultStyledDocument.ElementSpec[] data)
               throws BadLocationException

Inserts new elements in bulk. This is useful to allow parsing with the document in an unlocked state and prepare an element structure modification. This method takes an array of tokens that describe how to update an element structure so the time within a write lock can be greatly reduced in an asynchronous update situation.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Parameters:

offset - the starting offset >= 0

data - the element data

Throws:

BadLocationException - for an invalid starting offset

removeElement

public void removeElement(Element elem)

Removes an element from this document.

The element is removed from its parent element, as well as the text in the range identified by the element. If the element isn't associated with the document, IllegalArgumentException is thrown.

As empty branch elements are not allowed in the document, if the element is the sole child, its parent element is removed as well, recursively. This means that when replacing all the children of a particular element, new children should be added before removing old children.

Element removal results in two events being fired, the DocumentEvent for changes in element structure and UndoableEditEvent for changes in document content.

If the element contains end-of-content mark (the last "\n" character in document), this character is not removed; instead, preceding leaf element is extended to cover the character. If the last leaf already ends with "\n", it is included in content removal.

If the element is null, NullPointerException is thrown. If the element structure would become invalid after the removal, for example if the element is the document root element, IllegalArgumentException is thrown. If the current element structure is invalid, IllegalStateException is thrown.

Parameters:

elem - the element to remove

Throws:

NullPointerException - if the element is null

IllegalArgumentException - if the element could not be removed

IllegalStateException - if the element structure is invalid

Since:

1.7

addStyle

public Style addStyle(String nm,
 Style parent)

Adds a new style into the logical style hierarchy. Style attributes resolve from bottom up so an attribute specified in a child will override an attribute specified in the parent.

Specified by:

addStyle in interface StyledDocument

Parameters:

nm - the name of the style (must be unique within the collection of named styles). The name may be null if the style is unnamed, but the caller is responsible for managing the reference returned as an unnamed style can't be fetched by name. An unnamed style may be useful for things like character attribute overrides such as found in a style run.

parent - the parent style. This may be null if unspecified attributes need not be resolved in some other style.

Returns:

the style

removeStyle

public void removeStyle(String nm)

Removes a named style previously added to the document.

Specified by:

removeStyle in interface StyledDocument

Parameters:

nm - the name of the style to remove

getStyle

public Style getStyle(String nm)

Fetches a named style previously added.

Specified by:

getStyle in interface StyledDocument

Parameters:

nm - the name of the style

Returns:

the style

getStyleNames

public Enumeration<?> getStyleNames()

Fetches the list of style names.

Returns:

all the style names

setLogicalStyle

public void setLogicalStyle(int pos,
 Style s)

Sets the logical style to use for the paragraph at the given position. If attributes aren't explicitly set for character and paragraph attributes they will resolve through the logical style assigned to the paragraph, which in turn may resolve through some hierarchy completely independent of the element hierarchy in the document.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:

setLogicalStyle in interface StyledDocument

Parameters:

pos - the offset from the start of the document >= 0

s - the logical style to assign to the paragraph, null if none

getLogicalStyle

public Style getLogicalStyle(int p)

Fetches the logical style assigned to the paragraph represented by the given position.

Specified by:

getLogicalStyle in interface StyledDocument

Parameters:

p - the location to translate to a paragraph and determine the logical style assigned >= 0. This is an offset from the start of the document.

Returns:

the style, null if none

setCharacterAttributes

public void setCharacterAttributes(int offset,
 int length,
 AttributeSet s,
 boolean replace)

Sets attributes for some part of the document. A write lock is held by this operation while changes are being made, and a DocumentEvent is sent to the listeners after the change has been successfully completed.

offset and length define the range of the text over which the attributes are set. If the length is <= 0, then no action is taken and the method just returns. If the offset is <=0 or > the length of the text then no action is taken, and the method just returns. Otherwise if offset + length will exceed the length of the text then the affected range is truncated.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:

setCharacterAttributes in interface StyledDocument

Parameters:

offset - the offset in the document >= 0

length - the length > 0

s - the attributes

replace - true if the previous attributes should be replaced before setting the new attributes

setParagraphAttributes

public void setParagraphAttributes(int offset,
 int length,
 AttributeSet s,
 boolean replace)

Sets attributes for a paragraph.

This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.

Specified by:

setParagraphAttributes in interface StyledDocument

Parameters:

offset - the offset into the paragraph >= 0

length - the number of characters affected >= 0

s - the attributes

replace - whether to replace existing attributes, or merge them

getParagraphElement

public Element getParagraphElement(int pos)

Gets the paragraph element at the offset pos. A paragraph consists of at least one child Element, which is usually a leaf.

Specified by:

getParagraphElement in interface StyledDocument

Specified by:

getParagraphElement in class AbstractDocument

Parameters:

pos - the starting offset >= 0

Returns:

the element

getCharacterElement

public Element getCharacterElement(int pos)

Gets a character element based on a position.

Specified by:

getCharacterElement in interface StyledDocument

Parameters:

pos - the position in the document >= 0

Returns:

the element

insertUpdate

protected void insertUpdate(AbstractDocument.DefaultDocumentEvent chng,
 AttributeSet attr)

Updates document structure as a result of text insertion. This will happen within a write lock. This implementation simply parses the inserted content for line breaks and builds up a set of instructions for the element buffer.

Overrides:

insertUpdate in class AbstractDocument

Parameters:

chng - a description of the document change

attr - the attributes

removeUpdate

protected void removeUpdate(AbstractDocument.DefaultDocumentEvent chng)

Updates document structure as a result of text removal.

Overrides:

removeUpdate in class AbstractDocument

Parameters:

chng - a description of the document change

createDefaultRoot

protected AbstractDocument.AbstractElement createDefaultRoot()

Creates the root element to be used to represent the default document structure.

Returns:

the element base

getForeground

public Color getForeground(AttributeSet attr)

Gets the foreground color from an attribute set.

Specified by:

getForeground in interface StyledDocument

Parameters:

attr - the attribute set

Returns:

the color

getBackground

public Color getBackground(AttributeSet attr)

Gets the background color from an attribute set.

Specified by:

getBackground in interface StyledDocument

Parameters:

attr - the attribute set

Returns:

the color

getFont

public Font getFont(AttributeSet attr)

Gets the font from an attribute set.

Specified by:

getFont in interface StyledDocument

Parameters:

attr - the attribute set

Returns:

the font

styleChanged

protected void styleChanged(Style style)

Called when any of this document's styles have changed. Subclasses may wish to be intelligent about what gets damaged.

Parameters:

style - The Style that has changed.

addDocumentListener

public void addDocumentListener(DocumentListener listener)

Adds a document listener for notification of any changes.

Specified by:

addDocumentListener in interface Document

Overrides:

addDocumentListener in class AbstractDocument

Parameters:

listener - the listener

See Also:

• Document.addDocumentListener(javax.swing.event.DocumentListener)

removeDocumentListener

public void removeDocumentListener(DocumentListener listener)

Removes a document listener.

Specified by:

removeDocumentListener in interface Document

Overrides:

removeDocumentListener in class AbstractDocument

Parameters:

listener - the listener

See Also:

• Document.removeDocumentListener(javax.swing.event.DocumentListener)