JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing;
import sun.swing.SwingUtilities2;
import java.awt.*;
import java.awt.event.*;
import java.lang.reflect.*;
import java.net.*;
import java.util.*;
import java.io.*;
import java.util.*;
import javax.swing.plaf.*;
import javax.swing.text.*;
import javax.swing.event.*;
import javax.swing.text.html.*;
import javax.accessibility.*;
/**
* A text component to edit various kinds of content.
* You can find how-to information and examples of using editor panes in
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/text.html">Using Text Components</a>,
* a section in <em>The Java Tutorial.</em>
*
* <p>
* This component uses implementations of the
* <code>EditorKit</code> 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 <code>EditorKit</code> currently
* installed. If the content is set to a new URL, its type is used
* to determine the <code>EditorKit</code> that should be used to
* load the content.
* <p>
* By default, the following types of content are known:
* <dl>
* <dt><b>text/plain</b>
* <dd>Plain text, which is the default the type given isn't
* recognized. The kit used in this case is an extension of
* <code>DefaultEditorKit</code> that produces a wrapped plain text view.
* <dt><b>text/html</b>
* <dd>HTML text. The kit used in this case is the class
* <code>javax.swing.text.html.HTMLEditorKit</code>
* which provides HTML 3.2 support.
* <dt><b>text/rtf</b>
* <dd>RTF text. The kit used in this case is the class
* <code>javax.swing.text.rtf.RTFEditorKit</code>
* which provides a limited support of the Rich Text Format.
* </dl>
* <p>
* There are several ways to load content into this component.
* <ol>
* <li>
* The {@link #setText setText} method can be used to initialize
* the component from a string. In this case the current
* <code>EditorKit</code> will be used, and the content type will be
* expected to be of this type.
* <li>
* The {@link #read read} method can be used to initialize the
* component from a <code>Reader</code>. 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 <em>Base</em> property
* on <code>HTMLDocument</code> is set.
* In this case the current <code>EditorKit</code> will be used,
* and the content type will be expected to be of this type.
* <li>
* The {@link #setPage 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 <code>EditorKit</code>
* for that content type will be set.
* </ol>
* <p>
* Some kinds of content may provide hyperlink support by generating
* hyperlink events. The HTML <code>EditorKit</code> will generate
* hyperlink events if the <code>JEditorPane</code> is <em>not editable</em>
* (<code>JEditorPane.setEditable(false);</code> 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.
* <pre>
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();
}
}
}
}
}
* </pre>
* <p>
* For information on customizing how <b>text/html</b> is rendered please see
* {@link #W3C_LENGTH_UNITS} and {@link #HONOR_DISPLAY_PROPERTIES}
* <p>
* 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 (<code>JEditorPane</code>) it is converted to
* the document character set (ISO-10646 aka Unicode).
* <p>
* There are multiple ways to get a character set mapping to happen
* with <code>JEditorPane</code>.
* <ol>
* <li>
* One way is to specify the character set as a parameter of the MIME
* type. This will be established by a call to the
* {@link #setContentType setContentType} method. If the content
* is loaded by the {@link #setPage 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.
* <li>
* 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
* <code>EditorKit</code>.read operation throw a
* <code>ChangedCharSetException</code> which will
* be caught. The read is then restarted with a new Reader that uses
* the character set specified in the <code>ChangedCharSetException</code>
* (which is an <code>IOException</code>).
* </ol>
* <p>
* <dl>
* <dt><b><font size=+1>Newlines</font></b>
* <dd>
* For a discussion on how newlines are handled, see
* <a href="text/DefaultEditorKit.html">DefaultEditorKit</a>.
* </dl>
*
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @beaninfo
* attribute: isContainer false
* description: A text component to edit various types of content.
*
* @author Timothy Prinzing
*/
public class JEditorPane extends JTextComponent {
/**
* Creates a new <code>JEditorPane</code>.
* The document model is set to <code>null</code>.
*/
public JEditorPane() {
super();
setFocusCycleRoot(true);
setFocusTraversalPolicy(new LayoutFocusTraversalPolicy() {
public Component getComponentAfter(Container focusCycleRoot,
Component aComponent) {
if (focusCycleRoot != JEditorPane.this ||
(!isEditable() && getComponentCount() > 0)) {
return super.getComponentAfter(focusCycleRoot,
aComponent);
} else {
Container rootAncestor = getFocusCycleRootAncestor();
return (rootAncestor != null)
? rootAncestor.getFocusTraversalPolicy().
getComponentAfter(rootAncestor,
JEditorPane.this)
: null;
}
}
public Component getComponentBefore(Container focusCycleRoot,
Component aComponent) {
if (focusCycleRoot != JEditorPane.this ||
(!isEditable() && getComponentCount() > 0)) {
return super.getComponentBefore(focusCycleRoot,
aComponent);
} else {
Container rootAncestor = getFocusCycleRootAncestor();
return (rootAncestor != null)
? rootAncestor.getFocusTraversalPolicy().
getComponentBefore(rootAncestor,
JEditorPane.this)
: null;
}
}
public Component getDefaultComponent(Container focusCycleRoot)
{
return (focusCycleRoot != JEditorPane.this ||
(!isEditable() && getComponentCount() > 0))
? super.getDefaultComponent(focusCycleRoot)
: null;
}
protected boolean accept(Component aComponent) {
return (aComponent != JEditorPane.this)
? super.accept(aComponent)
: false;
}
});
LookAndFeel.installProperty(this,
"focusTraversalKeysForward",
JComponent.
getManagingFocusForwardTraversalKeys());
LookAndFeel.installProperty(this,
"focusTraversalKeysBackward",
JComponent.
getManagingFocusBackwardTraversalKeys());
}
/**
* Creates a <code>JEditorPane</code> based on a specified URL for input.
*
* @param initialPage the URL
* @exception IOException if the URL is <code>null</code>
* or cannot be accessed
*/
public JEditorPane(URL initialPage) throws IOException {
this();
setPage(initialPage);
}
/**
* Creates a <code>JEditorPane</code> based on a string containing
* a URL specification.
*
* @param url the URL
* @exception IOException if the URL is <code>null</code> or
* cannot be accessed
*/
public JEditorPane(String url) throws IOException {
this();
setPage(url);
}
/**
* Creates a <code>JEditorPane</code> that has been initialized
* to the given text. This is a convenience constructor that calls the
* <code>setContentType</code> and <code>setText</code> methods.
*
* @param type mime type of the given text
* @param text the text to initialize with; may be <code>null</code>
* @exception NullPointerException if the <code>type</code> parameter
* is <code>null</code>
*/
public JEditorPane(String type, String text) {
this();
setContentType(type);
setText(text);
}
/**
* Adds a hyperlink listener for notification of any changes, for example
* when a link is selected and entered.
*
* @param listener the listener
*/
public synchronized void addHyperlinkListener(HyperlinkListener listener) {
listenerList.add(HyperlinkListener.class, listener);
}
/**
* Removes a hyperlink listener.
*
* @param listener the listener
*/
public synchronized void removeHyperlinkListener(HyperlinkListener listener) {
listenerList.remove(HyperlinkListener.class, listener);
}
/**
* Returns an array of all the <code>HyperLinkListener</code>s added
* to this JEditorPane with addHyperlinkListener().
*
* @return all of the <code>HyperLinkListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
public synchronized HyperlinkListener[] getHyperlinkListeners() {
return listenerList.getListeners(javax.swing.event.HyperlinkListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. This is normally called
* by the currently installed <code>EditorKit</code> 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.
*
* @param e the event
* @see EventListenerList
*/
public void fireHyperlinkUpdate(HyperlinkEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==HyperlinkListener.class) {
((HyperlinkListener)listeners[i+1]).hyperlinkUpdate(e);
}
}
}
/**
* Sets the current URL being displayed. The content type of the
* pane is set, and if the editor kit for the pane is
* non-<code>null</code>, 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 <code>scrollToReference</code>
* 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:
*
* <pre>
* Document doc = jEditorPane.getDocument();
* doc.putProperty(Document.StreamDescriptionProperty, null);
* </pre>
*
* If the desired URL is not the one currently being
* displayed, the <code>getStream</code> method is called to
* give subclasses control over the stream provided.
* <p>
* This may load either synchronously or asynchronously
* depending upon the document returned by the <code>EditorKit</code>.
* If the <code>Document</code> is of type
* <code>AbstractDocument</code> and has a value returned by
* <code>AbstractDocument.getAsynchronousLoadPriority</code>
* that is greater than or equal to zero, the page will be
* loaded on a separate thread using that priority.
* <p>
* 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 <code>setDocument</code>, which
* is bound and will fire a property change event. If an
* <code>IOException</code> 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.
* <p>
* If the document is loaded asynchronously, the document
* will be installed into the editor immediately using a
* call to <code>setDocument</code> 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 <code>IOException</code>
* 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.
*
* @param page the URL of the page
* @exception IOException for a <code>null</code> or invalid
* page specification, or exception from the stream being read
* @see #getPage
* @beaninfo
* description: the URL used to set content
* bound: true
* expert: true
*/
public void setPage(URL page) throws IOException {
if (page == null) {
throw new IOException("invalid url");
}
URL loaded = getPage();
// reset scrollbar
if (!page.equals(loaded) && page.getRef() == null) {
scrollRectToVisible(new Rectangle(0,0,1,1));
}
boolean reloaded = false;
Object postData = getPostData();
if ((loaded == null) || !loaded.sameFile(page) || (postData != null)) {
// different url or POST method, load the new content
int p = getAsynchronousLoadPriority(getDocument());
if (p < 0) {
// open stream synchronously
InputStream in = getStream(page);
if (kit != null) {
Document doc = initializeModel(kit, page);
// At this point, one could either load up the model with no
// view notifications slowing it down (i.e. best synchronous
// behavior) or set the model and start to feed it on a separate
// thread (best asynchronous behavior).
p = getAsynchronousLoadPriority(doc);
if (p >= 0) {
// load asynchronously
setDocument(doc);
synchronized(this) {
pageLoader = new PageLoader(doc, in, loaded, page);
pageLoader.execute();
}
return;
}
read(in, doc);
setDocument(doc);
reloaded = true;
}
} else {
// we may need to cancel background loading
if (pageLoader != null) {
pageLoader.cancel(true);
}
// Do everything in a background thread.
// Model initialization is deferred to that thread, too.
pageLoader = new PageLoader(null, null, loaded, page);
pageLoader.execute();
return;
}
}
final String reference = page.getRef();
if (reference != null) {
if (!reloaded) {
scrollToReference(reference);
}
else {
// Have to scroll after painted.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
scrollToReference(reference);
}
});
}
getDocument().putProperty(Document.StreamDescriptionProperty, page);
}
firePropertyChange("page", loaded, page);
}
/**
* Create model and initialize document properties from page properties.
*/
private Document initializeModel(EditorKit kit, URL page) {
Document doc = kit.createDefaultDocument();
if (pageProperties != null) {
// transfer properties discovered in stream to the
// document property collection.
for (Enumeration<String> e = pageProperties.keys(); e.hasMoreElements() ;) {
String key = e.nextElement();
doc.putProperty(key, pageProperties.get(key));
}
pageProperties.clear();
}
if (doc.getProperty(Document.StreamDescriptionProperty) == null) {
doc.putProperty(Document.StreamDescriptionProperty, page);
}
return doc;
}
/**
* Return load priority for the document or -1 if priority not supported.
*/
private int getAsynchronousLoadPriority(Document doc) {
return (doc instanceof AbstractDocument ?
((AbstractDocument) doc).getAsynchronousLoadPriority() : -1);
}
/**
* This method initializes from a stream. If the kit is
* set to be of type <code>HTMLEditorKit</code>, and the
* <code>desc</code> parameter is an <code>HTMLDocument</code>,
* then it invokes the <code>HTMLEditorKit</code> to initiate
* the read. Otherwise it calls the superclass
* method which loads the model as plain text.
*
* @param in the stream from which to read
* @param desc an object describing the stream
* @exception IOException as thrown by the stream being
* used to initialize
* @see JTextComponent#read
* @see #setDocument
*/
public void read(InputStream in, Object desc) throws IOException {
if (desc instanceof HTMLDocument &&
kit instanceof HTMLEditorKit) {
HTMLDocument hdoc = (HTMLDocument) desc;
setDocument(hdoc);
read(in, hdoc);
} else {
String charset = (String) getClientProperty("charset");
Reader r = (charset != null) ? new InputStreamReader(in, charset) :
new InputStreamReader(in);
super.read(r, desc);
}
}
/**
* This method invokes the <code>EditorKit</code> to initiate a
* read. In the case where a <code>ChangedCharSetException</code>
* is thrown this exception will contain the new CharSet.
* Therefore the <code>read</code> operation
* is then restarted after building a new Reader with the new charset.
*
* @param in the inputstream to use
* @param doc the document to load
*
*/
void read(InputStream in, Document doc) throws IOException {
if (! Boolean.TRUE.equals(doc.getProperty("IgnoreCharsetDirective"))) {
final int READ_LIMIT = 1024 * 10;
in = new BufferedInputStream(in, READ_LIMIT);
in.mark(READ_LIMIT);
}
try {
String charset = (String) getClientProperty("charset");
Reader r = (charset != null) ? new InputStreamReader(in, charset) :
new InputStreamReader(in);
kit.read(r, doc, 0);
} catch (BadLocationException e) {
throw new IOException(e.getMessage());
} catch (ChangedCharSetException changedCharSetException) {
String charSetSpec = changedCharSetException.getCharSetSpec();
if (changedCharSetException.keyEqualsCharSet()) {
putClientProperty("charset", charSetSpec);
} else {
setCharsetFromContentTypeParameters(charSetSpec);
}
try {
in.reset();
} catch (IOException exception) {
//mark was invalidated
in.close();
URL url = (URL)doc.getProperty(Document.StreamDescriptionProperty);
if (url != null) {
URLConnection conn = url.openConnection();
in = conn.getInputStream();
} else {
//there is nothing we can do to recover stream
throw changedCharSetException;
}
}
try {
doc.remove(0, doc.getLength());
} catch (BadLocationException e) {}
doc.putProperty("IgnoreCharsetDirective", Boolean.valueOf(true));
read(in, doc);
}
}
/**
* Loads a stream into the text document model.
*/
class PageLoader extends SwingWorker<URL, Object> {
/**
* Construct an asynchronous page loader.
*/
PageLoader(Document doc, InputStream in, URL old, URL page) {
this.in = in;
this.old = old;
this.page = page;
this.doc = doc;
}
/**
* Try to load the document, then scroll the view
* to the reference (if specified). When done, fire
* a page property change event.
*/
protected URL doInBackground() {
boolean pageLoaded = false;
try {
if (in == null) {
in = getStream(page);
if (kit == null) {
// We received document of unknown content type.
UIManager.getLookAndFeel().
provideErrorFeedback(JEditorPane.this);
return old;
}
}
if (doc == null) {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
doc = initializeModel(kit, page);
setDocument(doc);
}
});
} catch (InvocationTargetException ex) {
UIManager.getLookAndFeel().provideErrorFeedback(
JEditorPane.this);
return old;
} catch (InterruptedException ex) {
UIManager.getLookAndFeel().provideErrorFeedback(
JEditorPane.this);
return old;
}
}
read(in, doc);
URL page = (URL) doc.getProperty(Document.StreamDescriptionProperty);
String reference = page.getRef();
if (reference != null) {
// scroll the page if necessary, but do it on the
// event thread... that is the only guarantee that
// modelToView can be safely called.
Runnable callScrollToReference = new Runnable() {
public void run() {
URL u = (URL) getDocument().getProperty
(Document.StreamDescriptionProperty);
String ref = u.getRef();
scrollToReference(ref);
}
};
SwingUtilities.invokeLater(callScrollToReference);
}
pageLoaded = true;
} catch (IOException ioe) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
} finally {
if (pageLoaded) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JEditorPane.this.firePropertyChange("page", old, page);
}
});
}
return (pageLoaded ? page : old);
}
}
/**
* The stream to load the document with
*/
InputStream in;
/**
* URL of the old page that was replaced (for the property change event)
*/
URL old;
/**
* URL of the page being loaded (for the property change event)
*/
URL page;
/**
* The Document instance to load into. This is cached in case a
* new Document is created between the time the thread this is created
* and run.
*/
Document doc;
}
/**
* Fetches a stream for the given URL, which is about to
* be loaded by the <code>setPage</code> 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.
* <p>
* This method is expected to have the the side effect of
* establishing the content type, and therefore setting the
* appropriate <code>EditorKit</code> to use for loading the stream.
* <p>
* If this the stream was an http connection, redirects
* will be followed and the resulting URL will be set as
* the <code>Document.StreamDescriptionProperty</code> so that relative
* URL's can be properly resolved.
*
* @param page the URL of the page
*/
protected InputStream getStream(URL page) throws IOException {
final URLConnection conn = page.openConnection();
if (conn instanceof HttpURLConnection) {
HttpURLConnection hconn = (HttpURLConnection) conn;
hconn.setInstanceFollowRedirects(false);
Object postData = getPostData();
if (postData != null) {
handlePostData(hconn, postData);
}
int response = hconn.getResponseCode();
boolean redirect = (response >= 300 && response <= 399);
/*
* In the case of a redirect, we want to actually change the URL
* that was input to the new, redirected URL
*/
if (redirect) {
String loc = conn.getHeaderField("Location");
if (loc.startsWith("http", 0)) {
page = new URL(loc);
} else {
page = new URL(page, loc);
}
return getStream(page);
}
}
// Connection properties handler should be forced to run on EDT,
// as it instantiates the EditorKit.
if (SwingUtilities.isEventDispatchThread()) {
handleConnectionProperties(conn);
} else {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
handleConnectionProperties(conn);
}
});
} catch (InterruptedException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
return conn.getInputStream();
}
/**
* Handle URL connection properties (most notably, content type).
*/
private void handleConnectionProperties(URLConnection conn) {
if (pageProperties == null) {
pageProperties = new Hashtable<String, Object>();
}
String type = conn.getContentType();
if (type != null) {
setContentType(type);
pageProperties.put("content-type", type);
}
pageProperties.put(Document.StreamDescriptionProperty, conn.getURL());
String enc = conn.getContentEncoding();
if (enc != null) {
pageProperties.put("content-encoding", enc);
}
}
private Object getPostData() {
return getDocument().getProperty(PostDataProperty);
}
private void handlePostData(HttpURLConnection conn, Object postData)
throws IOException {
conn.setDoOutput(true);
DataOutputStream os = null;
try {
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
os = new DataOutputStream(conn.getOutputStream());
os.writeBytes((String) postData);
} finally {
if (os != null) {
os.close();
}
}
}
/**
* Scrolls the view to the given reference location
* (that is, the value returned by the <code>UL.getRef</code>
* method for the URL being displayed). By default, this
* method only knows how to locate a reference in an
* HTMLDocument. The implementation calls the
* <code>scrollRectToVisible</code> 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.
*
* @param reference the named location to scroll to
*/
public void scrollToReference(String reference) {
Document d = getDocument();
if (d instanceof HTMLDocument) {
HTMLDocument doc = (HTMLDocument) d;
HTMLDocument.Iterator iter = doc.getIterator(HTML.Tag.A);
for (; iter.isValid(); iter.next()) {
AttributeSet a = iter.getAttributes();
String nm = (String) a.getAttribute(HTML.Attribute.NAME);
if ((nm != null) && nm.equals(reference)) {
// found a matching reference in the document.
try {
int pos = iter.getStartOffset();
Rectangle r = modelToView(pos);
if (r != null) {
// the view is visible, scroll it to the
// center of the current visible area.
Rectangle vis = getVisibleRect();
//r.y -= (vis.height / 2);
r.height = vis.height;
scrollRectToVisible(r);
setCaretPosition(pos);
}
} catch (BadLocationException ble) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
}
}
}
}
}
/**
* Gets the current URL being displayed. If a URL was
* not specified in the creation of the document, this
* will return <code>null</code>, and relative URL's will not be
* resolved.
*
* @return the URL, or <code>null</code> if none
*/
public URL getPage() {
return (URL) getDocument().getProperty(Document.StreamDescriptionProperty);
}
/**
* Sets the current URL being displayed.
*
* @param url the URL for display
* @exception IOException for a <code>null</code> or invalid URL
* specification
*/
public void setPage(String url) throws IOException {
if (url == null) {
throw new IOException("invalid url");
}
URL page = new URL(url);
setPage(page);
}
/**
* Gets the class ID for the UI.
*
* @return the string "EditorPaneUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Creates the default editor kit (<code>PlainEditorKit</code>) for when
* the component is first created.
*
* @return the editor kit
*/
protected EditorKit createDefaultEditorKit() {
return new PlainEditorKit();
}
/**
* Fetches the currently installed kit for handling content.
* <code>createDefaultEditorKit</code> is called to set up a default
* if necessary.
*
* @return the editor kit
*/
public EditorKit getEditorKit() {
if (kit == null) {
kit = createDefaultEditorKit();
isUserSetEditorKit = false;
}
return kit;
}
/**
* 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 <code>EditorKit</code>.
*
* @return the content type, <code>null</code> if no editor kit set
*/
public final String getContentType() {
return (kit != null) ? kit.getContentType() : null;
}
/**
* Sets the type of content that this editor
* handles. This calls <code>getEditorKitForContentType</code>,
* and then <code>setEditorKit</code> if an editor kit can
* be successfully located. This is mostly convenience method
* that can be used as an alternative to calling
* <code>setEditorKit</code> directly.
* <p>
* 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 <code>EditorKit</code>.
* For example if the type is specified as
* <code>text/html; charset=EUC-JP</code> the content
* will be loaded using the <code>EditorKit</code> registered for
* <code>text/html</code> and the Reader provided to
* the <code>EditorKit</code> to load unicode into the document will
* use the <code>EUC-JP</code> charset for translating
* to unicode. If the type is not recognized, the content
* will be loaded using the <code>EditorKit</code> registered
* for plain text, <code>text/plain</code>.
*
* @param type the non-<code>null</code> mime type for the content editing
* support
* @see #getContentType
* @beaninfo
* description: the type of content
* @throws NullPointerException if the <code>type</code> parameter
* is <code>null</code>
*/
public final void setContentType(String type) {
// The type could have optional info is part of it,
// for example some charset info. We need to strip that
// of and save it.
int parm = type.indexOf(";");
if (parm > -1) {
// Save the paramList.
String paramList = type.substring(parm);
// update the content type string.
type = type.substring(0, parm).trim();
if (type.toLowerCase().startsWith("text/")) {
setCharsetFromContentTypeParameters(paramList);
}
}
if ((kit == null) || (! type.equals(kit.getContentType()))
|| !isUserSetEditorKit) {
EditorKit k = getEditorKitForContentType(type);
if (k != null && k != kit) {
setEditorKit(k);
isUserSetEditorKit = false;
}
}
}
/**
* This method gets the charset information specified as part
* of the content type in the http header information.
*/
private void setCharsetFromContentTypeParameters(String paramlist) {
String charset;
try {
// paramlist is handed to us with a leading ';', strip it.
int semi = paramlist.indexOf(';');
if (semi > -1 && semi < paramlist.length()-1) {
paramlist = paramlist.substring(semi + 1);
}
if (paramlist.length() > 0) {
// parse the paramlist into attr-value pairs & get the
// charset pair's value
HeaderParser hdrParser = new HeaderParser(paramlist);
charset = hdrParser.findValue("charset");
if (charset != null) {
putClientProperty("charset", charset);
}
}
}
catch (IndexOutOfBoundsException e) {
// malformed parameter list, use charset we have
}
catch (NullPointerException e) {
// malformed parameter list, use charset we have
}
catch (Exception e) {
// malformed parameter list, use charset we have; but complain
System.err.println("JEditorPane.getCharsetFromContentTypeParameters failed on: " + paramlist);
e.printStackTrace();
}
}
/**
* Sets the currently installed kit for handling
* content. This is the bound property that
* establishes the content type of the editor.
* Any old kit is first deinstalled, then if kit is
* non-<code>null</code>,
* the new kit is installed, and a default document created for it.
* A <code>PropertyChange</code> event ("editorKit") is always fired when
* <code>setEditorKit</code> is called.
* <p>
* <em>NOTE: This has the side effect of changing the model,
* because the <code>EditorKit</code> is the source of how a
* particular type
* of content is modeled. This method will cause <code>setDocument</code>
* to be called on behalf of the caller to ensure integrity
* of the internal state.</em>
*
* @param kit the desired editor behavior
* @see #getEditorKit
* @beaninfo
* description: the currently installed kit for handling content
* bound: true
* expert: true
*/
public void setEditorKit(EditorKit kit) {
EditorKit old = this.kit;
isUserSetEditorKit = true;
if (old != null) {
old.deinstall(this);
}
this.kit = kit;
if (this.kit != null) {
this.kit.install(this);
setDocument(this.kit.createDefaultDocument());
}
firePropertyChange("editorKit", old, kit);
}
/**
* Fetches the editor kit to use for the given type
* of content. This is called when a type is requested
* that doesn't match the currently installed type.
* If the component doesn't have an <code>EditorKit</code> registered
* for the given type, it will try to create an
* <code>EditorKit</code> from the default <code>EditorKit</code> registry.
* If that fails, a <code>PlainEditorKit</code> is used on the
* assumption that all text documents can be represented
* as plain text.
* <p>
* 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.
*
* @param type the non-<code>null</code> content type
* @return the editor kit
*/
public EditorKit getEditorKitForContentType(String type) {
if (typeHandlers == null) {
typeHandlers = new Hashtable<String, EditorKit>(3);
}
EditorKit k = typeHandlers.get(type);
if (k == null) {
k = createEditorKitForContentType(type);
if (k != null) {
setEditorKitForContentType(type, k);
}
}
if (k == null) {
k = createDefaultEditorKit();
}
return k;
}
/**
* Directly sets the editor kit to use for the given type. A
* look-and-feel implementation might use this in conjunction
* with <code>createEditorKitForContentType</code> to install handlers for
* content types with a look-and-feel bias.
*
* @param type the non-<code>null</code> content type
* @param k the editor kit to be set
*/
public void setEditorKitForContentType(String type, EditorKit k) {
if (typeHandlers == null) {
typeHandlers = new Hashtable<String, EditorKit>(3);
}
typeHandlers.put(type, k);
}
/**
* Replaces the currently selected content with new content
* represented by the given string. If there is no selection
* this amounts to an insert of the given text. If there
* is no replacement text (i.e. the content string is empty
* or <code>null</code>) this amounts to a removal of the
* current selection. The replacement text will have the
* attributes currently defined for input. If the component is not
* editable, beep and return.
*
* @param content the content to replace the selection with. This
* value can be <code>null</code>
*/
@Override
public void replaceSelection(String content) {
if (! isEditable()) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
return;
}
EditorKit kit = getEditorKit();
if(kit instanceof StyledEditorKit) {
try {
Document doc = getDocument();
Caret caret = getCaret();
boolean composedTextSaved = saveComposedText(caret.getDot());
int p0 = Math.min(caret.getDot(), caret.getMark());
int p1 = Math.max(caret.getDot(), caret.getMark());
if (doc instanceof AbstractDocument) {
((AbstractDocument)doc).replace(p0, p1 - p0, content,
((StyledEditorKit)kit).getInputAttributes());
}
else {
if (p0 != p1) {
doc.remove(p0, p1 - p0);
}
if (content != null && content.length() > 0) {
doc.insertString(p0, content, ((StyledEditorKit)kit).
getInputAttributes());
}
}
if (composedTextSaved) {
restoreComposedText();
}
} catch (BadLocationException e) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
}
}
else {
super.replaceSelection(content);
}
}
/**
* Creates a handler for the given type from the default registry
* of editor kits. The registry is created if necessary. If the
* registered class has not yet been loaded, an attempt
* is made to dynamically load the prototype of the kit for the
* given type. If the type was registered with a <code>ClassLoader</code>,
* that <code>ClassLoader</code> will be used to load the prototype.
* If there was no registered <code>ClassLoader</code>,
* <code>Class.forName</code> will be used to load the prototype.
* <p>
* Once a prototype <code>EditorKit</code> instance is successfully
* located, it is cloned and the clone is returned.
*
* @param type the content type
* @return the editor kit, or <code>null</code> if there is nothing
* registered for the given type
*/
public static EditorKit createEditorKitForContentType(String type) {
Hashtable<String, EditorKit> kitRegistry = getKitRegisty();
EditorKit k = kitRegistry.get(type);
if (k == null) {
// try to dynamically load the support
String classname = getKitTypeRegistry().get(type);
ClassLoader loader = getKitLoaderRegistry().get(type);
try {
Class c;
if (loader != null) {
c = loader.loadClass(classname);
} else {
// Will only happen if developer has invoked
// registerEditorKitForContentType(type, class, null).
c = Class.forName(classname, true, Thread.currentThread().
getContextClassLoader());
}
k = (EditorKit) c.newInstance();
kitRegistry.put(type, k);
} catch (Throwable e) {
k = null;
}
}
// create a copy of the prototype or null if there
// is no prototype.
if (k != null) {
return (EditorKit) k.clone();
}
return null;
}
/**
* Establishes the default bindings of <code>type</code> to
* <code>classname</code>.
* The class will be dynamically loaded later when actually
* needed, and can be safely changed before attempted uses
* to avoid loading unwanted classes. The prototype
* <code>EditorKit</code> will be loaded with <code>Class.forName</code>
* when registered with this method.
*
* @param type the non-<code>null</code> content type
* @param classname the class to load later
*/
public static void registerEditorKitForContentType(String type, String classname) {
registerEditorKitForContentType(type, classname,Thread.currentThread().
getContextClassLoader());
}
/**
* Establishes the default bindings of <code>type</code> to
* <code>classname</code>.
* The class will be dynamically loaded later when actually
* needed using the given <code>ClassLoader</code>,
* and can be safely changed
* before attempted uses to avoid loading unwanted classes.
*
* @param type the non-<code>null</code> content type
* @param classname the class to load later
* @param loader the <code>ClassLoader</code> to use to load the name
*/
public static void registerEditorKitForContentType(String type, String classname, ClassLoader loader) {
getKitTypeRegistry().put(type, classname);
getKitLoaderRegistry().put(type, loader);
getKitRegisty().remove(type);
}
/**
* Returns the currently registered <code>EditorKit</code>
* class name for the type <code>type</code>.
*
* @param type the non-<code>null</code> content type
*
* @since 1.3
*/
public static String getEditorKitClassNameForContentType(String type) {
return getKitTypeRegistry().get(type);
}
private static Hashtable<String, String> getKitTypeRegistry() {
loadDefaultKitsIfNecessary();
return (Hashtable)SwingUtilities.appContextGet(kitTypeRegistryKey);
}
private static Hashtable<String, ClassLoader> getKitLoaderRegistry() {
loadDefaultKitsIfNecessary();
return (Hashtable)SwingUtilities.appContextGet(kitLoaderRegistryKey);
}
private static Hashtable<String, EditorKit> getKitRegisty() {
Hashtable ht = (Hashtable)SwingUtilities.appContextGet(kitRegistryKey);
if (ht == null) {
ht = new Hashtable(3);
SwingUtilities.appContextPut(kitRegistryKey, ht);
}
return ht;
}
/**
* This is invoked every time the registries are accessed. Loading
* is done this way instead of via a static as the static is only
* called once when running in plugin resulting in the entries only
* appearing in the first applet.
*/
private static void loadDefaultKitsIfNecessary() {
if (SwingUtilities.appContextGet(kitTypeRegistryKey) == null) {
synchronized(defaultEditorKitMap) {
if (defaultEditorKitMap.size() == 0) {
defaultEditorKitMap.put("text/plain",
"javax.swing.JEditorPane$PlainEditorKit");
defaultEditorKitMap.put("text/html",
"javax.swing.text.html.HTMLEditorKit");
defaultEditorKitMap.put("text/rtf",
"javax.swing.text.rtf.RTFEditorKit");
defaultEditorKitMap.put("application/rtf",
"javax.swing.text.rtf.RTFEditorKit");
}
}
Hashtable ht = new Hashtable();
SwingUtilities.appContextPut(kitTypeRegistryKey, ht);
ht = new Hashtable();
SwingUtilities.appContextPut(kitLoaderRegistryKey, ht);
for (String key : defaultEditorKitMap.keySet()) {
registerEditorKitForContentType(key,defaultEditorKitMap.get(key));
}
}
}
// --- java.awt.Component methods --------------------------
/**
* Returns the preferred size for the <code>JEditorPane</code>.
* The preferred size for <code>JEditorPane</code> is slightly altered
* from the preferred size of the superclass. If the size
* of the viewport has become smaller than the minimum size
* of the component, the scrollable definition for tracking
* width or height will turn to false. The default viewport
* layout will give the preferred size, and that is not desired
* in the case where the scrollable is tracking. In that case
* the <em>normal</em> preferred size is adjusted to the
* minimum size. This allows things like HTML tables to
* shrink down to their minimum size and then be laid out at
* their minimum size, refusing to shrink any further.
*
* @return a <code>Dimension</code> containing the preferred size
*/
public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
JViewport port = (JViewport) parent;
TextUI ui = getUI();
int prefWidth = d.width;
int prefHeight = d.height;
if (! getScrollableTracksViewportWidth()) {
int w = port.getWidth();
Dimension min = ui.getMinimumSize(this);
if (w != 0 && w < min.width) {
// Only adjust to min if we have a valid size
prefWidth = min.width;
}
}
if (! getScrollableTracksViewportHeight()) {
int h = port.getHeight();
Dimension min = ui.getMinimumSize(this);
if (h != 0 && h < min.height) {
// Only adjust to min if we have a valid size
prefHeight = min.height;
}
}
if (prefWidth != d.width || prefHeight != d.height) {
d = new Dimension(prefWidth, prefHeight);
}
}
return d;
}
// --- JTextComponent methods -----------------------------
/**
* Sets the text of this <code>TextComponent</code> to the specified
* content,
* which is expected to be in the format of the content type of
* this editor. For example, if the type is set to <code>text/html</code>
* the string should be specified in terms of HTML.
* <p>
* This is implemented to remove the contents of the current document,
* and replace them by parsing the given string using the current
* <code>EditorKit</code>. This gives the semantics of the
* superclass by not changing
* out the model, while supporting the content type currently set on
* this component. The assumption is that the previous content is
* relatively
* small, and that the previous content doesn't have side effects.
* Both of those assumptions can be violated and cause undesirable results.
* To avoid this, create a new document,
* <code>getEditorKit().createDefaultDocument()</code>, and replace the
* existing <code>Document</code> with the new one. You are then assured the
* previous <code>Document</code> won't have any lingering state.
* <ol>
* <li>
* Leaving the existing model in place means that the old view will be
* torn down, and a new view created, where replacing the document would
* avoid the tear down of the old view.
* <li>
* Some formats (such as HTML) can install things into the document that
* can influence future contents. HTML can have style information embedded
* that would influence the next content installed unexpectedly.
* </ol>
* <p>
* An alternative way to load this component with a string would be to
* create a StringReader and call the read method. In this case the model
* would be replaced after it was initialized with the contents of the
* string.
*
* @param t the new text to be set; if <code>null</code> the old
* text will be deleted
* @see #getText
* @beaninfo
* description: the text of this component
*/
public void setText(String t) {
try {
Document doc = getDocument();
doc.remove(0, doc.getLength());
if (t == null || t.equals("")) {
return;
}
Reader r = new StringReader(t);
EditorKit kit = getEditorKit();
kit.read(r, doc, 0);
} catch (IOException ioe) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
} catch (BadLocationException ble) {
UIManager.getLookAndFeel().provideErrorFeedback(JEditorPane.this);
}
}
/**
* Returns the text contained in this <code>TextComponent</code>
* in terms of the
* content type of this editor. If an exception is thrown while
* attempting to retrieve the text, <code>null</code> will be returned.
* This is implemented to call <code>JTextComponent.write</code> with
* a <code>StringWriter</code>.
*
* @return the text
* @see #setText
*/
public String getText() {
String txt;
try {
StringWriter buf = new StringWriter();
write(buf);
txt = buf.toString();
} catch (IOException ioe) {
txt = null;
}
return txt;
}
// --- Scrollable ----------------------------------------
/**
* Returns true if a viewport should always force the width of this
* <code>Scrollable</code> to match the width of the viewport.
*
* @return true if a viewport should force the Scrollables width to
* match its own, false otherwise
*/
public boolean getScrollableTracksViewportWidth() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
JViewport port = (JViewport) parent;
TextUI ui = getUI();
int w = port.getWidth();
Dimension min = ui.getMinimumSize(this);
Dimension max = ui.getMaximumSize(this);
if ((w >= min.width) && (w <= max.width)) {
return true;
}
}
return false;
}
/**
* Returns true if a viewport should always force the height of this
* <code>Scrollable</code> to match the height of the viewport.
*
* @return true if a viewport should force the
* <code>Scrollable</code>'s height to match its own,
* false otherwise
*/
public boolean getScrollableTracksViewportHeight() {
Container parent = SwingUtilities.getUnwrappedParent(this);
if (parent instanceof JViewport) {
JViewport port = (JViewport) parent;
TextUI ui = getUI();
int h = port.getHeight();
Dimension min = ui.getMinimumSize(this);
if (h >= min.height) {
Dimension max = ui.getMaximumSize(this);
if (h <= max.height) {
return true;
}
}
}
return false;
}
// --- Serialization ------------------------------------
/**
* See <code>readObject</code> and <code>writeObject</code> in
* <code>JComponent</code> for more
* information about serialization in Swing.
*/
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
if (getUIClassID().equals(uiClassID)) {
byte count = JComponent.getWriteObjCounter(this);
JComponent.setWriteObjCounter(this, --count);
if (count == 0 && ui != null) {
ui.installUI(this);
}
}
}
// --- variables ---------------------------------------
private SwingWorker<URL, Object> pageLoader;
/**
* Current content binding of the editor.
*/
private EditorKit kit;
private boolean isUserSetEditorKit;
private Hashtable<String, Object> pageProperties;
/** Should be kept in sync with javax.swing.text.html.FormView counterpart. */
final static String PostDataProperty = "javax.swing.JEditorPane.postdata";
/**
* Table of registered type handlers for this editor.
*/
private Hashtable<String, EditorKit> typeHandlers;
/*
* Private AppContext keys for this class's static variables.
*/
private static final Object kitRegistryKey =
new StringBuffer("JEditorPane.kitRegistry");
private static final Object kitTypeRegistryKey =
new StringBuffer("JEditorPane.kitTypeRegistry");
private static final Object kitLoaderRegistryKey =
new StringBuffer("JEditorPane.kitLoaderRegistry");
/**
* @see #getUIClassID
* @see #readObject
*/
private static final String uiClassID = "EditorPaneUI";
/**
* Key for a client property used to indicate whether
* <a href="http://www.w3.org/TR/CSS21/syndata.html#length-units">
* w3c compliant</a> length units are used for html rendering.
* <p>
* By default this is not enabled; to enable
* it set the client {@link #putClientProperty property} with this name
* to <code>Boolean.TRUE</code>.
*
* @since 1.5
*/
public static final String W3C_LENGTH_UNITS = "JEditorPane.w3cLengthUnits";
/**
* 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.
* <p>
* The default varies based on the look and feel;
* to enable it set the client {@link #putClientProperty property} with
* this name to <code>Boolean.TRUE</code>.
*
* @since 1.5
*/
public static final String HONOR_DISPLAY_PROPERTIES = "JEditorPane.honorDisplayProperties";
static final Map<String, String> defaultEditorKitMap = new HashMap<String, String>(0);
/**
* Returns a string representation of this <code>JEditorPane</code>.
* This method
* is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not
* be <code>null</code>.
*
* @return a string representation of this <code>JEditorPane</code>
*/
protected String paramString() {
String kitString = (kit != null ?
kit.toString() : "");
String typeHandlersString = (typeHandlers != null ?
typeHandlers.toString() : "");
return super.paramString() +
",kit=" + kitString +
",typeHandlers=" + typeHandlersString;
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JEditorPane.
* For editor panes, the AccessibleContext takes the form of an
* AccessibleJEditorPane.
* A new AccessibleJEditorPane instance is created if necessary.
*
* @return an AccessibleJEditorPane that serves as the
* AccessibleContext of this JEditorPane
*/
public AccessibleContext getAccessibleContext() {
if (getEditorKit() instanceof HTMLEditorKit) {
if (accessibleContext == null || accessibleContext.getClass() !=
AccessibleJEditorPaneHTML.class) {
accessibleContext = new AccessibleJEditorPaneHTML();
}
} else if (accessibleContext == null || accessibleContext.getClass() !=
AccessibleJEditorPane.class) {
accessibleContext = new AccessibleJEditorPane();
}
return accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JEditorPane</code> class. It provides an implementation of the
* Java Accessibility API appropriate to editor pane user-interface
* elements.
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
protected class AccessibleJEditorPane extends AccessibleJTextComponent {
/**
* Gets the accessibleDescription property of this object. If this
* property isn't set, returns the content type of this
* <code>JEditorPane</code> instead (e.g. "plain/text", "html/text").
*
* @return the localized description of the object; <code>null</code>
* if this object does not have a description
*
* @see #setAccessibleName
*/
public String getAccessibleDescription() {
String description = accessibleDescription;
// fallback to client property
if (description == null) {
description = (String)getClientProperty(AccessibleContext.ACCESSIBLE_DESCRIPTION_PROPERTY);
}
if (description == null) {
description = JEditorPane.this.getContentType();
}
return description;
}
/**
* Gets the state set of this object.
*
* @return an instance of AccessibleStateSet describing the states
* of the object
* @see AccessibleStateSet
*/
public AccessibleStateSet getAccessibleStateSet() {
AccessibleStateSet states = super.getAccessibleStateSet();
states.add(AccessibleState.MULTI_LINE);
return states;
}
}
/**
* This class provides support for <code>AccessibleHypertext</code>,
* and is used in instances where the <code>EditorKit</code>
* installed in this <code>JEditorPane</code> is an instance of
* <code>HTMLEditorKit</code>.
* <p>
* <strong>Warning:</strong>
* 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 <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
protected class AccessibleJEditorPaneHTML extends AccessibleJEditorPane {
private AccessibleContext accessibleContext;
public AccessibleText getAccessibleText() {
return new JEditorPaneAccessibleHypertextSupport();
}
protected AccessibleJEditorPaneHTML () {
HTMLEditorKit kit = (HTMLEditorKit)JEditorPane.this.getEditorKit();
accessibleContext = kit.getAccessibleContext();
}
/**
* Returns the number of accessible children of the object.
*
* @return the number of accessible children of the object.
*/
public int getAccessibleChildrenCount() {
if (accessibleContext != null) {
return accessibleContext.getAccessibleChildrenCount();
} else {
return 0;
}
}
/**
* Returns the specified Accessible child of the object. The Accessible
* children of an Accessible object are zero-based, so the first child
* of an Accessible child is at index 0, the second child is at index 1,
* and so on.
*
* @param i zero-based index of child
* @return the Accessible child of the object
* @see #getAccessibleChildrenCount
*/
public Accessible getAccessibleChild(int i) {
if (accessibleContext != null) {
return accessibleContext.getAccessibleChild(i);
} else {
return null;
}
}
/**
* Returns the Accessible child, if one exists, contained at the local
* coordinate Point.
*
* @param p The point relative to the coordinate system of this object.
* @return the Accessible, if it exists, at the specified location;
* otherwise null
*/
public Accessible getAccessibleAt(Point p) {
if (accessibleContext != null && p != null) {
try {
AccessibleComponent acomp =
accessibleContext.getAccessibleComponent();
if (acomp != null) {
return acomp.getAccessibleAt(p);
} else {
return null;
}
} catch (IllegalComponentStateException e) {
return null;
}
} else {
return null;
}
}
}
/**
* What's returned by
* <code>AccessibleJEditorPaneHTML.getAccessibleText</code>.
*
* Provides support for <code>AccessibleHypertext</code> in case
* there is an HTML document being displayed in this
* <code>JEditorPane</code>.
*
*/
protected class JEditorPaneAccessibleHypertextSupport
extends AccessibleJEditorPane implements AccessibleHypertext {
public class HTMLLink extends AccessibleHyperlink {
Element element;
public HTMLLink(Element e) {
element = e;
}
/**
* Since the document a link is associated with may have
* changed, this method returns whether this Link is valid
* anymore (with respect to the document it references).
*
* @return a flag indicating whether this link is still valid with
* respect to the AccessibleHypertext it belongs to
*/
public boolean isValid() {
return JEditorPaneAccessibleHypertextSupport.this.linksValid;
}
/**
* Returns the number of accessible actions available in this Link
* If there are more than one, the first one is NOT considered the
* "default" action of this LINK object (e.g. in an HTML imagemap).
* In general, links will have only one AccessibleAction in them.
*
* @return the zero-based number of Actions in this object
*/
public int getAccessibleActionCount() {
return 1;
}
/**
* Perform the specified Action on the object
*
* @param i zero-based index of actions
* @return true if the the action was performed; else false.
* @see #getAccessibleActionCount
*/
public boolean doAccessibleAction(int i) {
if (i == 0 && isValid() == true) {
URL u = (URL) getAccessibleActionObject(i);
if (u != null) {
HyperlinkEvent linkEvent =
new HyperlinkEvent(JEditorPane.this, HyperlinkEvent.EventType.ACTIVATED, u);
JEditorPane.this.fireHyperlinkUpdate(linkEvent);
return true;
}
}
return false; // link invalid or i != 0
}
/**
* Return a String description of this particular
* link action. The string returned is the text
* within the document associated with the element
* which contains this link.
*
* @param i zero-based index of the actions
* @return a String description of the action
* @see #getAccessibleActionCount
*/
public String getAccessibleActionDescription(int i) {
if (i == 0 && isValid() == true) {
Document d = JEditorPane.this.getDocument();
if (d != null) {
try {
return d.getText(getStartIndex(),
getEndIndex() - getStartIndex());
} catch (BadLocationException exception) {
return null;
}
}
}
return null;
}
/**
* Returns a URL object that represents the link.
*
* @param i zero-based index of the actions
* @return an URL representing the HTML link itself
* @see #getAccessibleActionCount
*/
public Object getAccessibleActionObject(int i) {
if (i == 0 && isValid() == true) {
AttributeSet as = element.getAttributes();
AttributeSet anchor =
(AttributeSet) as.getAttribute(HTML.Tag.A);
String href = (anchor != null) ?
(String) anchor.getAttribute(HTML.Attribute.HREF) : null;
if (href != null) {
URL u;
try {
u = new URL(JEditorPane.this.getPage(), href);
} catch (MalformedURLException m) {
u = null;
}
return u;
}
}
return null; // link invalid or i != 0
}
/**
* Return an object that represents the link anchor,
* as appropriate for that link. E.g. from HTML:
* <a href="http://www.sun.com/access">Accessibility</a>
* this method would return a String containing the text:
* 'Accessibility'.
*
* Similarly, from this HTML:
* <a HREF="#top"><img src="top-hat.gif" alt="top hat"></a>
* this might return the object ImageIcon("top-hat.gif", "top hat");
*
* @param i zero-based index of the actions
* @return an Object representing the hypertext anchor
* @see #getAccessibleActionCount
*/
public Object getAccessibleActionAnchor(int i) {
return getAccessibleActionDescription(i);
}
/**
* Get the index with the hypertext document at which this
* link begins
*
* @return index of start of link
*/
public int getStartIndex() {
return element.getStartOffset();
}
/**
* Get the index with the hypertext document at which this
* link ends
*
* @return index of end of link
*/
public int getEndIndex() {
return element.getEndOffset();
}
}
private class LinkVector extends Vector<HTMLLink> {
public int baseElementIndex(Element e) {
HTMLLink l;
for (int i = 0; i < elementCount; i++) {
l = elementAt(i);
if (l.element == e) {
return i;
}
}
return -1;
}
}
LinkVector hyperlinks;
boolean linksValid = false;
/**
* Build the private table mapping links to locations in the text
*/
private void buildLinkTable() {
hyperlinks.removeAllElements();
Document d = JEditorPane.this.getDocument();
if (d != null) {
ElementIterator ei = new ElementIterator(d);
Element e;
AttributeSet as;
AttributeSet anchor;
String href;
while ((e = ei.next()) != null) {
if (e.isLeaf()) {
as = e.getAttributes();
anchor = (AttributeSet) as.getAttribute(HTML.Tag.A);
href = (anchor != null) ?
(String) anchor.getAttribute(HTML.Attribute.HREF) : null;
if (href != null) {
hyperlinks.addElement(new HTMLLink(e));
}
}
}
}
linksValid = true;
}
/**
* Make one of these puppies
*/
public JEditorPaneAccessibleHypertextSupport() {
hyperlinks = new LinkVector();
Document d = JEditorPane.this.getDocument();
if (d != null) {
d.addDocumentListener(new DocumentListener() {
public void changedUpdate(DocumentEvent theEvent) {
linksValid = false;
}
public void insertUpdate(DocumentEvent theEvent) {
linksValid = false;
}
public void removeUpdate(DocumentEvent theEvent) {
linksValid = false;
}
});
}
}
/**
* Returns the number of links within this hypertext doc.
*
* @return number of links in this hypertext doc.
*/
public int getLinkCount() {
if (linksValid == false) {
buildLinkTable();
}
return hyperlinks.size();
}
/**
* Returns the index into an array of hyperlinks that
* is associated with this character index, or -1 if there
* is no hyperlink associated with this index.
*
* @param charIndex index within the text
* @return index into the set of hyperlinks for this hypertext doc.
*/
public int getLinkIndex(int charIndex) {
if (linksValid == false) {
buildLinkTable();
}
Element e = null;
Document doc = JEditorPane.this.getDocument();
if (doc != null) {
for (e = doc.getDefaultRootElement(); ! e.isLeaf(); ) {
int index = e.getElementIndex(charIndex);
e = e.getElement(index);
}
}
// don't need to verify that it's an HREF element; if
// not, then it won't be in the hyperlinks Vector, and
// so indexOf will return -1 in any case
return hyperlinks.baseElementIndex(e);
}
/**
* Returns the index into an array of hyperlinks that
* index. If there is no hyperlink at this index, it returns
* null.
*
* @param linkIndex into the set of hyperlinks for this hypertext doc.
* @return string representation of the hyperlink
*/
public AccessibleHyperlink getLink(int linkIndex) {
if (linksValid == false) {
buildLinkTable();
}
if (linkIndex >= 0 && linkIndex < hyperlinks.size()) {
return hyperlinks.elementAt(linkIndex);
} else {
return null;
}
}
/**
* Returns the contiguous text within the document that
* is associated with this hyperlink.
*
* @param linkIndex into the set of hyperlinks for this hypertext doc.
* @return the contiguous text sharing the link at this index
*/
public String getLinkText(int linkIndex) {
if (linksValid == false) {
buildLinkTable();
}
Element e = (Element) hyperlinks.elementAt(linkIndex);
if (e != null) {
Document d = JEditorPane.this.getDocument();
if (d != null) {
try {
return d.getText(e.getStartOffset(),
e.getEndOffset() - e.getStartOffset());
} catch (BadLocationException exception) {
return null;
}
}
}
return null;
}
}
static class PlainEditorKit extends DefaultEditorKit implements ViewFactory {
/**
* Fetches a factory that is suitable for producing
* views of any models that are produced by this
* kit. The default is to have the UI produce the
* factory, so this method has no implementation.
*
* @return the view factory
*/
public ViewFactory getViewFactory() {
return this;
}
/**
* Creates a view from the given structural element of a
* document.
*
* @param elem the piece of the document to build a view of
* @return the view
* @see View
*/
public View create(Element elem) {
Document doc = elem.getDocument();
Object i18nFlag
= doc.getProperty("i18n"/*AbstractDocument.I18NProperty*/);
if ((i18nFlag != null) && i18nFlag.equals(Boolean.TRUE)) {
// build a view that support bidi
return createI18N(elem);
} else {
return new WrappedPlainView(elem);
}
}
View createI18N(Element elem) {
String kind = elem.getName();
if (kind != null) {
if (kind.equals(AbstractDocument.ContentElementName)) {
return new PlainParagraph(elem);
} else if (kind.equals(AbstractDocument.ParagraphElementName)){
return new BoxView(elem, View.Y_AXIS);
}
}
return null;
}
/**
* Paragraph for representing plain-text lines that support
* bidirectional text.
*/
static class PlainParagraph extends javax.swing.text.ParagraphView {
PlainParagraph(Element elem) {
super(elem);
layoutPool = new LogicalView(elem);
layoutPool.setParent(this);
}
protected void setPropertiesFromAttributes() {
Component c = getContainer();
if ((c != null)
&& (! c.getComponentOrientation().isLeftToRight()))
{
setJustification(StyleConstants.ALIGN_RIGHT);
} else {
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