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Java Platform 1.2 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.awt.Component | +--java.awt.Container | +--javax.swing.JComponent | +--javax.swing.text.JTextComponent | +--javax.swing.JEditorPane
A text component to edit various kinds of content. 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:
javax.swing.text.html.HTMLEditorKit
which provides html 3.2 support.
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.
For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JEditorPane key assignments.
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
(i.e. 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();
}
}
}
}
}
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.
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. A future release of Swing will provide support for long term persistence.
Inner Class Summary | |
protected class |
JEditorPane.AccessibleJEditorPane
The class used to obtain the accessible role for this object. |
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() Provides support for AccessibleHypertext in case there is an HTML document being displayed in this JEditorPane. |
Inner classes inherited from class javax.swing.text.JTextComponent |
JTextComponent.AccessibleJTextComponent,
JTextComponent.KeyBinding |
Inner classes inherited from class javax.swing.JComponent |
JComponent.AccessibleJComponent |
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 |
Constructor Summary | |
JEditorPane()
Constructs 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)
Create 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()
Get 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. |
EditorKit |
getEditorKitForContentType(String type)
Fetches the editor kit to use for the given type of content. |
URL |
getPage()
Gets the current url being displayed. |
Dimension |
getPreferredSize()
The preferred size for JEditorPane is slightly altered from the preferred size of the superclass. |
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)
Fetch 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. |
boolean |
isManagingFocus()
Turns off tab traversal once focus gained. |
protected String |
paramString()
Returns a string representation of this JEditorPane. |
protected void |
processComponentKeyEvent(KeyEvent e)
Make sure that TAB and Shift-TAB events get consumed, so that awt doesn't attempt focus traversal. |
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 name. |
static void |
registerEditorKitForContentType(String type,
String classname,
ClassLoader loader)
Establishes the default bindings of type to name. |
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. |
protected void |
scrollToReference(String reference)
Scroll the view to the given reference location (i.e. |
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 set 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 java.awt.Container |
add,
add,
add,
add,
add,
addContainerListener,
addImpl,
countComponents,
deliverEvent,
doLayout,
findComponentAt,
findComponentAt,
getComponent,
getComponentAt,
getComponentAt,
getComponentCount,
getComponents,
getLayout,
insets,
invalidate,
isAncestorOf,
layout,
list,
list,
locate,
minimumSize,
paintComponents,
preferredSize,
print,
printComponents,
processContainerEvent,
processEvent,
remove,
remove,
removeAll,
removeContainerListener,
setLayout,
validate,
validateTree |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait |
Constructor Detail |
public JEditorPane()
public JEditorPane(URL initialPage) throws IOException
initialPage
- the URLpublic JEditorPane(String url) throws IOException
url
- the URLpublic JEditorPane(String type, String text)
setContentType
and setText
methods.type
- mime type of the given text.text
- the text to initialize with.Method Detail |
public void addHyperlinkListener(HyperlinkListener listener)
listener
- the listenerpublic void removeHyperlinkListener(HyperlinkListener listener)
listener
- the listenerpublic void fireHyperlinkUpdate(HyperlinkEvent e)
e
- the eventEventListenerList
public void setPage(URL page) throws IOException
scrollToReference
method. 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 seperate 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.
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.
page
- the URL of the pagegetPage()
public void read(InputStream in, Object desc) throws IOException
in
- The stream to read fromdesc
- An object describing the stream.JTextComponent.read(java.io.Reader, java.lang.Object)
,
JTextComponent.setDocument(javax.swing.text.Document)
protected InputStream getStream(URL page) throws IOException
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 establising the content type, and therefore setting the appropriate EditorKit to use for loading the stream.
protected void scrollToReference(String reference)
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.reference
- the named location to scroll to.public URL getPage()
public void setPage(String url) throws IOException
url
- the URL for displaypublic String getUIClassID()
JComponent.getUIClassID()
,
UIDefaults.getUI(javax.swing.JComponent)
protected EditorKit createDefaultEditorKit()
public final EditorKit getEditorKit()
public final String getContentType()
public final void setContentType(String type)
getEditorKitForContentType
,
and then setEditorKit
if an editor kit can
be successfully located. This is mostly convenience method
that can be used as an alternative to calling
setEditorKit
directly.
If there is a charset definition specified as a parameter
of the content type specification, it will be used when
loading input streams using the associated EditorKit.
For example if the type is specified as
text/html; charset=EUC-JP
the content
will be loaded using the EditorKit registered for
text/html
and the Reader provided to
the EditorKit to load unicode into the document will
use the EUC-JP
charset for translating
to unicode.
type
- the non-null mime type for the content editing
support.getContentType()
public void setEditorKit(EditorKit kit)
kit
- the desired editor behavior.getEditorKit()
public EditorKit getEditorKitForContentType(String type)
This method can be reimplemented to use some other kind of type registry. This can be reimplemented to use the Java Activation Framework for example.
type
- the non-null content typepublic void setEditorKitForContentType(String type, EditorKit k)
type
- the non-null content typek
- the editor kit to be setpublic void replaceSelection(String content)
This method is thread safe, although most Swing methods are not. Please see Threads and Swing for more information.
content
- the content to replace the selection withpublic static EditorKit createEditorKitForContentType(String type)
Once a prototype EditorKit instance is successfully located, it is cloned and the clone is returned.
type
- the content typepublic static void registerEditorKitForContentType(String type, String classname)
type
- the non-null content typeclassname
- the class to load laterpublic static void registerEditorKitForContentType(String type, String classname, ClassLoader loader)
type
- the non-null content typeclassname
- the class to load laterloader
- the ClassLoader to use to load the namepublic Dimension getPreferredSize()
public boolean isManagingFocus()
protected void processComponentKeyEvent(KeyEvent e)
public void setText(String t)
text/html
the string should be specified in terms of html. This is implemented
to call JTextComponent.read
with a
StringReader
[
This method is thread safe, although most Swing methods are not. Please see Threads and Swing for more information.
t
- the new text to be setgetText()
public String getText()
JTextComponent.write
with
a StringWriter
.setText(java.lang.String)
public boolean getScrollableTracksViewportWidth()
public boolean getScrollableTracksViewportHeight()
protected String paramString()
null
.
Overriding paramString() to provide information about the specific new aspects of the JFC components.
public AccessibleContext getAccessibleContext()
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Java Platform 1.2 |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |