HTMLEditorKit for application SimplyHTML.
*
* In stage 1 this only re-implements how style sheets are handled by * default.
* *Stage 3 adds functionality for usage of the custom HTML document * and HTML reader used with SimplyHTML from this stage on.
* *With stage 9 some additional views have been added to * the view factory as a workaround for bug id 4765271 * (see http://developer.java.sun.com/developer/bugParade/bugs/4765271.html).
* *OK, I give up: With release 2 of stage 9 above views are used no longer and * bug fixing is not done anymore. The HTML support is almost taken as is in the hope * that Sun will enhance it some day. To do compensation inside a single application * is not possible with a reasonable effort.
* * @author Ulrich Hilger * @author Light Development * @author http://www.lightdev.com * @author info@lightdev.com * @author published under the terms and conditions of the * GNU General Public License, * for details see file gpl.txt in the distribution * package of this software * * */ public class SHTMLEditorKit extends HTMLEditorKit { SHTMLEditorKit() { super(); final Cursor textCursor = Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR); setDefaultCursor(textCursor); } /* --------------- SHTMLDocument implementation start ------------ */ /** * Create an uninitialized text storage model * that is appropriate for this type of editor. * * @return the model */ public Document createDefaultDocument() { final SHTMLDocument doc = (SHTMLDocument) createEmptyDocument(); try { final String standardContent; if (Util.preferenceIsTrue("gray_row_below_end")) { standardContent = "\n
\n\n" + SHTMLDocument.SUFFIX + "\n
\n"; } else { standardContent = "\n
\n\n" + SHTMLDocument.SUFFIX + "\n
\n"; } doc.setOuterHTML(doc.getParagraphElement(doc.getLength()), standardContent); } catch (final BadLocationException e) { e.printStackTrace(); } catch (final IOException e) { e.printStackTrace(); } return doc; } Document createEmptyDocument() { getStyleSheet(); final StyleSheet ss = new ScaledStyleSheet(); try { ss.importStyleSheet(Class.forName("javax.swing.text.html.HTMLEditorKit").getResource(DEFAULT_CSS)); } catch (final Exception e) { } final SHTMLDocument doc = new SHTMLDocument(ss); doc.setParser(getParser()); doc.setAsynchronousLoadPriority(-1); doc.setTokenThreshold(1); return doc; } /** * Inserts content from the given stream. Ifdoc is
* an instance of HTMLDocument, this will read
* HTML 3.2 text. Inserting HTML into a non-empty document must be inside
* the body Element, if you do not insert into the body an exception will
* be thrown. When inserting into a non-empty document all tags outside
* of the body (head, title) will be dropped.
*
* @param in the stream to read from
* @param doc the destination for the insertion
* @param pos the location in the document to place the
* content
* @exception IOException on any I/O error
* @exception BadLocationException if pos represents an invalid
* location within the document
* @exception RuntimeException (will eventually be a BadLocationException)
* if pos is invalid
*/
public void read(final Reader in, final Document doc, final int pos) throws IOException, BadLocationException {
if (doc instanceof SHTMLDocument) {
final SHTMLDocument hdoc = (SHTMLDocument) doc;
final Parser parser = getParser();
if (parser == null) {
throw new IOException("Can't load parser");
}
if (pos > doc.getLength()) {
throw new BadLocationException("Invalid location", pos);
}
final ParserCallback receiver = hdoc.getReader(pos);
if (doc.getLength() == 0) {
final Boolean ignoreCharset = (Boolean) doc.getProperty("IgnoreCharsetDirective");
parser.parse(in, receiver, (ignoreCharset == null) ? false : ignoreCharset.booleanValue());
}
else {
parser.parse(in, receiver, true);
}
receiver.flush();
}
else {
super.read(in, doc, pos);
}
}
/**
* Write content from a document to the given stream
* in a format appropriate for this kind of content handler.
*
* @param out the stream to write to
* @param doc the source for the write
* @param pos the location in the document to fetch the
* content
* @param len the amount to write out
* @exception IOException on any I/O error
* @exception BadLocationException if pos represents an invalid
* location within the document
*/
public void write(final Writer out, final Document doc, final int pos, final int len) throws IOException,
BadLocationException {
if (doc instanceof SHTMLDocument) {
try {
final SHTMLWriter w = new SHTMLWriter(out, (SHTMLDocument) doc, pos, len);
w.write();
}
catch (final Exception e) {
e.printStackTrace();
}
}
else if (doc instanceof StyledDocument) {
final MinimalHTMLWriter w = new MinimalHTMLWriter(out, (StyledDocument) doc, pos, len);
w.write();
}
else {
super.write(out, doc, pos, len);
}
}
/* --------------- SHTMLDocument implementaion end --------------- */
void updateInputAttributes(final SHTMLEditorPane e) {
// EditorKit might not have installed the StyledDocument yet.
final Document aDoc = e.getDocument();
if (!(aDoc instanceof StyledDocument)) {
return;
}
final int start = e.getSelectionStart();
// record current character attributes.
final StyledDocument doc = (StyledDocument) aDoc;
// If nothing is selected, get the attributes from the character
// before the start of the selection, otherwise get the attributes
// from the character element at the start of the selection.
Element run;
final Element currentParagraph = doc.getParagraphElement(start);
if (currentParagraph.getStartOffset() == start || start != e.getSelectionEnd()) {
// Get the attributes from the character at the selection
// if in a different paragrah!
run = doc.getCharacterElement(start);
}
else {
run = doc.getCharacterElement(Math.max(start - 1, 0));
}
createInputAttributes(run, getInputAttributes());
}
/* --------------- ViewFactory implementation start -------------- */
/** Shared factory for creating HTML Views. */
private static final ViewFactory defaultFactory = new SHTMLFactory();
/**
* Fetch a factory that is suitable for producing
* views of any models that are produced by this
* kit.
*
* @return the factory
*/
public ViewFactory getViewFactory() {
return defaultFactory;
}
static public void removeCharacterAttributes(final StyledDocument doc, final Object attributeName, final int start,
final int length) {
// clear all character attributes in selection
final int end = start + length;
SimpleAttributeSet sasText = null;
for (int i = start; i < end;) {
final Element characterElement = doc.getCharacterElement(i);
sasText = new SimpleAttributeSet(characterElement.getAttributes().copyAttributes());
final int endOffset = characterElement.getEndOffset();
final Enumeration attribEntries1 = sasText.getAttributeNames();
while (attribEntries1.hasMoreElements()) {
final Object entryKey = attribEntries1.nextElement();
if (attributeName != null && entryKey.equals(attributeName) || attributeName == null
&& !entryKey.equals(StyleConstants.NameAttribute)) {
sasText.removeAttribute(entryKey);
}
}
final int last = end < endOffset ? end : endOffset;
try {
doc.setCharacterAttributes(i, last - i, sasText, true);
}
catch (final Exception e) {
}
i = i < last ? last : i + 1;
}
}
public static class SHTMLFactory extends HTMLEditorKit.HTMLFactory implements ViewFactory {
public View create(final Element elem) {
View view = null;
final Object o = elem.getAttributes().getAttribute(StyleConstants.NameAttribute);
if (o instanceof HTML.Tag) {
final HTML.Tag kind = (HTML.Tag) o;
//System.out.println("SHTMLEditorKit.SHTMLFactory o is HTML.Tag kind=" + kind.toString());
if (kind == HTML.Tag.TABLE) {
view = super.create(elem);
}
else if (kind == HTML.Tag.COMMENT) {
view = new InvisibleView(elem);
}
else if (kind instanceof HTML.UnknownTag) {
view = new InvisibleView(elem);
}
else {
view = super.create(elem);
}
}
else {
view = new LabelView(elem);
}
return view;
}
}
/* --------------- ViewFactory implementation end -------------- */
}