javax.swing
Class JEditorPane

java.lang.Object
  java.awt.Component
      java.awt.Container
          javax.swing.JComponent
              javax.swing.text.JTextComponent
                  javax.swing.JEditorPane

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible, Scrollable

Direct Known Subclasses:

JTextPane

public class JEditorPane
extends JTextComponent

A text component to edit various kinds of content. You can find how-to information and examples of using editor panes in Using Text Components, a section in The Java Tutorial.

This component uses implementations of the EditorKit to accomplish its behavior. It effectively morphs into the proper kind of text editor for the kind of content it is given. The content type that editor is bound to at any given time is determined by the EditorKit currently installed. If the content is set to a new URL, its type is used to determine the EditorKit that should be used to load the content.

By default, the following types of content are known:

text/plain

Plain text, which is the default the type given isn't recognized. The kit used in this case is an extension of DefaultEditorKit that produces a wrapped plain text view.

text/html

HTML text. The kit used in this case is the class javax.swing.text.html.HTMLEditorKit which provides HTML 3.2 support.

text/rtf

RTF text. The kit used in this case is the class javax.swing.text.rtf.RTFEditorKit which provides a limited support of the Rich Text Format.

There are several ways to load content into this component.

1. The setText method can be used to initialize the component from a string. In this case the current EditorKit will be used, and the content type will be expected to be of this type.
2. The read method can be used to initialize the component from a Reader. Note that if the content type is HTML, relative references (e.g. for things like images) can't be resolved unless the <base> tag is used or the Base property on HTMLDocument is set. In this case the current EditorKit will be used, and the content type will be expected to be of this type.
3. The setPage method can be used to initialize the component from a URL. In this case, the content type will be determined from the URL, and the registered EditorKit for that content type will be set.

Some kinds of content may provide hyperlink support by generating hyperlink events. The HTML EditorKit will generate hyperlink events if the JEditorPane is not editable (JEditorPane.setEditable(false); has been called). If HTML frames are embedded in the document, the typical response would be to change a portion of the current document. The following code fragment is a possible hyperlink listener implementation, that treats HTML frame events specially, and simply displays any other activated hyperlinks.

     class Hyperactive implements HyperlinkListener {
 
         public void hyperlinkUpdate(HyperlinkEvent e) {
             if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                 JEditorPane pane = (JEditorPane) e.getSource();
                 if (e instanceof HTMLFrameHyperlinkEvent) {
                     HTMLFrameHyperlinkEvent  evt = (HTMLFrameHyperlinkEvent)e;
                     HTMLDocument doc = (HTMLDocument)pane.getDocument();
                     doc.processHTMLFrameHyperlinkEvent(evt);
                 } else {
                     try {
                         pane.setPage(e.getURL());
                     } catch (Throwable t) {
                         t.printStackTrace();
                     }
                 }
             }
         }
     }

 

For information on customizing how text/html is rendered please see W3C_LENGTH_UNITS and HONOR_DISPLAY_PROPERTIES

Culturally dependent information in some documents is handled through a mechanism called character encoding. Character encoding is an unambiguous mapping of the members of a character set (letters, ideographs, digits, symbols, or control functions) to specific numeric code values. It represents the way the file is stored. Example character encodings are ISO-8859-1, ISO-8859-5, Shift-jis, Euc-jp, and UTF-8. When the file is passed to an user agent (JEditorPane) it is converted to the document character set (ISO-10646 aka Unicode).

There are multiple ways to get a character set mapping to happen with JEditorPane.

1. One way is to specify the character set as a parameter of the MIME type. This will be established by a call to the setContentType method. If the content is loaded by the setPage method the content type will have been set according to the specification of the URL. It the file is loaded directly, the content type would be expected to have been set prior to loading.
2. Another way the character set can be specified is in the document itself. This requires reading the document prior to determining the character set that is desired. To handle this, it is expected that the EditorKit.read operation throw a ChangedCharSetException which will be caught. The read is then restarted with a new Reader that uses the character set specified in the ChangedCharSetException (which is an IOException).

Newlines

For a discussion on how newlines are handled, see DefaultEditorKit.

Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

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^TM has been added to the java.beans package. Please see XMLEncoder.

Nested Class Summary
protected  class	JEditorPane.AccessibleJEditorPane           This class implements accessibility support for the JEditorPane class.
protected  class	JEditorPane.AccessibleJEditorPaneHTML           This class provides support for AccessibleHypertext, and is used in instances where the EditorKit installed in this JEditorPane is an instance of HTMLEditorKit.
protected  class	JEditorPane.JEditorPaneAccessibleHypertextSupport           What's returned by AccessibleJEditorPaneHTML.getAccessibleText.

 

Nested classes/interfaces inherited from class javax.swing.text.JTextComponent
JTextComponent.AccessibleJTextComponent, JTextComponent.DropLocation, JTextComponent.KeyBinding

 

Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent

 

Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer

 

Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

 

Field Summary
static String	HONOR_DISPLAY_PROPERTIES           Key for a client property used to indicate whether the default font and foreground color from the component are used if a font or foreground color is not specified in the styled text.
static String	W3C_LENGTH_UNITS           Key for a client property used to indicate whether w3c compliant length units are used for html rendering.

 

Fields inherited from class javax.swing.text.JTextComponent
DEFAULT_KEYMAP, FOCUS_ACCELERATOR_KEY

 

Fields inherited from class javax.swing.JComponent
accessibleContext, listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

 

Fields inherited from class java.awt.Component
BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

 

Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

 

Constructor Summary
JEditorPane()           Creates a new JEditorPane.
JEditorPane(String url)           Creates a JEditorPane based on a string containing a URL specification.
JEditorPane(String type, String text)           Creates a JEditorPane that has been initialized to the given text.
JEditorPane(URL initialPage)           Creates a JEditorPane based on a specified URL for input.

 

Method Summary
void	addHyperlinkListener(HyperlinkListener listener)           Adds a hyperlink listener for notification of any changes, for example when a link is selected and entered.
protected  EditorKit	createDefaultEditorKit()           Creates the default editor kit (PlainEditorKit) for when the component is first created.
static EditorKit	createEditorKitForContentType(String type)           Creates a handler for the given type from the default registry of editor kits.
void	fireHyperlinkUpdate(HyperlinkEvent e)           Notifies all listeners that have registered interest for notification on this event type.
AccessibleContext	getAccessibleContext()           Gets the AccessibleContext associated with this JEditorPane.
String	getContentType()           Gets the type of content that this editor is currently set to deal with.
EditorKit	getEditorKit()           Fetches the currently installed kit for handling content.
static String	getEditorKitClassNameForContentType(String type)           Returns the currently registered EditorKit class name for the type type.
EditorKit	getEditorKitForContentType(String type)           Fetches the editor kit to use for the given type of content.
HyperlinkListener[]	getHyperlinkListeners()           Returns an array of all the HyperLinkListeners added to this JEditorPane with addHyperlinkListener().
URL	getPage()           Gets the current URL being displayed.
Dimension	getPreferredSize()           Returns the preferred size for the JEditorPane.
boolean	getScrollableTracksViewportHeight()           Returns true if a viewport should always force the height of this Scrollable to match the height of the viewport.
boolean	getScrollableTracksViewportWidth()           Returns true if a viewport should always force the width of this Scrollable to match the width of the viewport.
protected  InputStream	getStream(URL page)           Fetches a stream for the given URL, which is about to be loaded by the setPage method.
String	getText()           Returns the text contained in this TextComponent in terms of the content type of this editor.
String	getUIClassID()           Gets the class ID for the UI.
protected  String	paramString()           Returns a string representation of this JEditorPane.
void	read(InputStream in, Object desc)           This method initializes from a stream.
static void	registerEditorKitForContentType(String type, String classname)           Establishes the default bindings of type to classname.
static void	registerEditorKitForContentType(String type, String classname, ClassLoader loader)           Establishes the default bindings of type to classname.
void	removeHyperlinkListener(HyperlinkListener listener)           Removes a hyperlink listener.
void	replaceSelection(String content)           Replaces the currently selected content with new content represented by the given string.
void	scrollToReference(String reference)           Scrolls the view to the given reference location (that is, the value returned by the UL.getRef method for the URL being displayed).
void	setContentType(String type)           Sets the type of content that this editor handles.
void	setEditorKit(EditorKit kit)           Sets the currently installed kit for handling content.
void	setEditorKitForContentType(String type, EditorKit k)           Directly sets the editor kit to use for the given type.
void	setPage(String url)           Sets the current URL being displayed.
void	setPage(URL page)           Sets the current URL being displayed.
void	setText(String t)           Sets the text of this TextComponent to the specified content, which is expected to be in the format of the content type of this editor.

 

Methods inherited from class javax.swing.text.JTextComponent

addCaretListener, addInputMethodListener, addKeymap, copy, cut, fireCaretUpdate, getActions, getCaret, getCaretColor, getCaretListeners, getCaretPosition, getDisabledTextColor, getDocument, getDragEnabled, getDropLocation, getDropMode, getFocusAccelerator, getHighlighter, getInputMethodRequests, getKeymap, getKeymap, getMargin, getNavigationFilter, getPreferredScrollableViewportSize, getPrintable, getScrollableBlockIncrement, getScrollableUnitIncrement, getSelectedText, getSelectedTextColor, getSelectionColor, getSelectionEnd, getSelectionStart, getText, getToolTipText, getUI, isEditable, loadKeymap, modelToView, moveCaretPosition, paste, print, print, print, processInputMethodEvent, read, removeCaretListener, removeKeymap, removeNotify, select, selectAll, setCaret, setCaretColor, setCaretPosition, setComponentOrientation, setDisabledTextColor, setDocument, setDragEnabled, setDropMode, setEditable, setFocusAccelerator, setHighlighter, setKeymap, setMargin, setNavigationFilter, setSelectedTextColor, setSelectionColor, setSelectionEnd, setSelectionStart, setUI, updateUI, viewToModel, write

 

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

 

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validate, validateTree

 

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

W3C_LENGTH_UNITS

public static final String W3C_LENGTH_UNITS

Key for a client property used to indicate whether w3c compliant length units are used for html rendering.

By default this is not enabled; to enable it set the client property with this name to Boolean.TRUE.

Since:

1.5

See Also:

Constant Field Values

HONOR_DISPLAY_PROPERTIES

public static final String HONOR_DISPLAY_PROPERTIES

Key for a client property used to indicate whether the default font and foreground color from the component are used if a font or foreground color is not specified in the styled text.

The default varies based on the look and feel; to enable it set the client property with this name to Boolean.TRUE.

Since:

1.5

See Also:

Constant Field Values

JEditorPane

public JEditorPane()

Creates a new JEditorPane. The document model is set to null.

JEditorPane

public JEditorPane(URL initialPage)
            throws IOException

Creates a JEditorPane based on a specified URL for input.

Parameters:

initialPage - the URL

Throws:

IOException - if the URL is null or cannot be accessed

JEditorPane

public JEditorPane(String url)
            throws IOException

Creates a JEditorPane based on a string containing a URL specification.

Parameters:

url - the URL

Throws:

IOException - if the URL is null or cannot be accessed

JEditorPane

public JEditorPane(String type,
                   String text)

Creates a JEditorPane that has been initialized to the given text. This is a convenience constructor that calls the setContentType and setText methods.

Parameters:

type - mime type of the given text

text - the text to initialize with; may be null

Throws:

NullPointerException - if the type parameter is null

addHyperlinkListener

public void addHyperlinkListener(HyperlinkListener listener)

Adds a hyperlink listener for notification of any changes, for example when a link is selected and entered.

Parameters:

listener - the listener

removeHyperlinkListener

public void removeHyperlinkListener(HyperlinkListener listener)

Removes a hyperlink listener.

Parameters:

listener - the listener

getHyperlinkListeners

public HyperlinkListener[] getHyperlinkListeners()

Returns an array of all the HyperLinkListeners added to this JEditorPane with addHyperlinkListener().

Returns:

all of the HyperLinkListeners added or an empty array if no listeners have been added

Since:

1.4

fireHyperlinkUpdate

public void fireHyperlinkUpdate(HyperlinkEvent e)

Notifies all listeners that have registered interest for notification on this event type. This is normally called by the currently installed EditorKit if a content type that supports hyperlinks is currently active and there was activity with a link. The listener list is processed last to first.

Parameters:

e - the event

See Also:

EventListenerList

setPage

public void setPage(URL page)
             throws IOException

Sets the current URL being displayed. The content type of the pane is set, and if the editor kit for the pane is non-null, then a new default document is created and the URL is read into it. If the URL contains and reference location, the location will be scrolled to by calling the scrollToReference method. If the desired URL is the one currently being displayed, the document will not be reloaded. To force a document reload it is necessary to clear the stream description property of the document. The following code shows how this can be done:

   Document doc = jEditorPane.getDocument();
   doc.putProperty(Document.StreamDescriptionProperty, null);
 

If the desired URL is not the one currently being displayed, the getStream method is called to give subclasses control over the stream provided.

This may load either synchronously or asynchronously depending upon the document returned by the EditorKit. If the Document is of type AbstractDocument and has a value returned by AbstractDocument.getAsynchronousLoadPriority that is greater than or equal to zero, the page will be loaded on a separate thread using that priority.

If the document is loaded synchronously, it will be filled in with the stream prior to being installed into the editor with a call to setDocument, which is bound and will fire a property change event. If an IOException is thrown the partially loaded document will be discarded and neither the document or page property change events will be fired. If the document is successfully loaded and installed, a view will be built for it by the UI which will then be scrolled if necessary, and then the page property change event will be fired.

If the document is loaded asynchronously, the document will be installed into the editor immediately using a call to setDocument which will fire a document property change event, then a thread will be created which will begin doing the actual loading. In this case, the page property change event will not be fired by the call to this method directly, but rather will be fired when the thread doing the loading has finished. It will also be fired on the event-dispatch thread. Since the calling thread can not throw an IOException in the event of failure on the other thread, the page property change event will be fired when the other thread is done whether the load was successful or not.

Parameters:

page - the URL of the page

Throws:

IOException - for a null or invalid page specification, or exception from the stream being read

See Also:

getPage()

read

public void read(InputStream in,
                 Object desc)
          throws IOException

This method initializes from a stream. If the kit is set to be of type HTMLEditorKit, and the desc parameter is an HTMLDocument, then it invokes the HTMLEditorKit to initiate the read. Otherwise it calls the superclass method which loads the model as plain text.

Parameters:

in - the stream from which to read

desc - an object describing the stream

Throws:

IOException - as thrown by the stream being used to initialize

See Also:

JTextComponent.read(java.io.Reader, java.lang.Object), JTextComponent.setDocument(javax.swing.text.Document)

getStream

protected InputStream getStream(URL page)
                         throws IOException

Fetches a stream for the given URL, which is about to be loaded by the setPage method. By default, this simply opens the URL and returns the stream. This can be reimplemented to do useful things like fetch the stream from a cache, monitor the progress of the stream, etc.

This method is expected to have the the side effect of establishing the content type, and therefore setting the appropriate EditorKit to use for loading the stream.

If this the stream was an http connection, redirects will be followed and the resulting URL will be set as the Document.StreamDescriptionProperty so that relative URL's can be properly resolved.

Parameters:

page - the URL of the page

Throws:

IOException

scrollToReference

public void scrollToReference(String reference)

Scrolls the view to the given reference location (that is, the value returned by the UL.getRef method for the URL being displayed). By default, this method only knows how to locate a reference in an HTMLDocument. The implementation calls the scrollRectToVisible method to accomplish the actual scrolling. If scrolling to a reference location is needed for document types other than HTML, this method should be reimplemented. This method will have no effect if the component is not visible.

Parameters:

reference - the named location to scroll to

getPage

public URL getPage()

Gets the current URL being displayed. If a URL was not specified in the creation of the document, this will return null, and relative URL's will not be resolved.

Returns:

the URL, or null if none

setPage

public void setPage(String url)
             throws IOException

Sets the current URL being displayed.

Parameters:

url - the URL for display

Throws:

IOException - for a null or invalid URL specification

getUIClassID

public String getUIClassID()

Gets the class ID for the UI.

Overrides:

getUIClassID in class JComponent

Returns:

the string "EditorPaneUI"

See Also:

JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

createDefaultEditorKit

protected EditorKit createDefaultEditorKit()

Creates the default editor kit (PlainEditorKit) for when the component is first created.

Returns:

the editor kit

getEditorKit

public EditorKit getEditorKit()

Fetches the currently installed kit for handling content. createDefaultEditorKit is called to set up a default if necessary.

Returns:

the editor kit

getContentType

public final String getContentType()

Gets the type of content that this editor is currently set to deal with. This is defined to be the type associated with the currently installed EditorKit.

Returns:

the content type, null if n