下面列出了javax.swing.text.Document#createPosition ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* Gets a <code>Position</code> in the document at the given offset. The
* position is automatically updated when the document's contents is modified.
* The <code>Position</code> does not reference the document in anyway that
* would prevent the document from being garbage collected.
*
* @param doc The document to get a position in.
* @param offset The initial offset of the position.
*
* @return A <code>Position</code> inside the document.
* @throws BadLocationException If the offset is not valid for the document.
*/
public static Position get(Document doc, int offset) throws BadLocationException {
// Check that the offset is valid. This should excercise any rule imposed by
// the document on its positions.
doc.createPosition(offset);
synchronized (OGLS) {
OffsetGapList<WeakP> ogl = OGLS.get(doc);
if (ogl == null) {
ogl = new OffsetGapList<WeakPositions.WeakP>();
OGLS.put(doc, ogl);
doc.addDocumentListener(WeakListeners.document(documentsTracker, doc));
}
int index = ogl.findElementIndex(offset);
WeakP pos = index >= 0 ? ogl.get(index) : null;
if (pos == null) {
pos = new WeakP(offset);
ogl.add(pos);
}
return pos;
}
}
@Override
public String getSelectedText() {
Document doc = getDocument();
int start = getSelectionStart();
int end = getSelectionEnd();
try {
Position p0 = doc.createPosition(start);
Position p1 = doc.createPosition(end);
StringWriter sw = new StringWriter(p1.getOffset() - p0.getOffset());
getEditorKit().write(sw, doc, p0.getOffset(), p1.getOffset() - p0.getOffset());
return StringHtmlUtil.removeHtmlTags(sw.toString());
}
catch (BadLocationException | IOException ignored) {
}
return super.getSelectedText();
}
@Override
public int indentLine(Document doc, int offset) {
Indent indent = Indent.get(doc);
indent.lock();
try {
if (doc instanceof BaseDocument) {
((BaseDocument) doc).atomicLock();
}
try {
Position pos = doc.createPosition(offset);
indent.reindent(offset);
return pos.getOffset();
} catch (BadLocationException ble) {
return offset;
} finally {
if (doc instanceof BaseDocument) {
((BaseDocument) doc).atomicUnlock();
}
}
} finally {
indent.unlock();
}
}
public void testCuriosities() throws Exception {
// Test position at offset 0 does not move after insert
Document doc = new PlainDocument();
doc.insertString(0, "test", null);
Position pos = doc.createPosition(0);
assertEquals(0, pos.getOffset());
doc.insertString(0, "a", null);
assertEquals(0, pos.getOffset());
// Test there is an extra newline above doc.getLength()
assertEquals("\n", doc.getText(doc.getLength(), 1));
assertEquals("atest\n", doc.getText(0, doc.getLength() + 1));
// Test the last line element contains the extra newline
Element lineElem = doc.getDefaultRootElement().getElement(0);
assertEquals(0, lineElem.getStartOffset());
assertEquals(doc.getLength() + 1, lineElem.getEndOffset());
// Test that once position gets to zero it won't go anywhere else (unless undo performed)
pos = doc.createPosition(1);
doc.remove(0, 1);
assertEquals(0, pos.getOffset());
doc.insertString(0, "b", null);
assertEquals(0, pos.getOffset());
}
/**
* Adds a highlight to the view. Returns a tag that can be used
* to refer to the highlight.
*
* @param p0 the start offset of the range to highlight >= 0
* @param p1 the end offset of the range to highlight >= p0
* @param p the painter to use to actually render the highlight
* @return an object that can be used as a tag
* to refer to the highlight
* @exception BadLocationException if the specified location is invalid
*/
public Object addHighlight(int p0, int p1, Highlighter.HighlightPainter p) throws BadLocationException {
Document doc = component.getDocument();
HighlightInfo i = (getDrawsLayeredHighlights() &&
(p instanceof LayeredHighlighter.LayerPainter)) ?
new LayeredHighlightInfo() : new HighlightInfo();
i.painter = p;
i.p0 = doc.createPosition(p0);
i.p1 = doc.createPosition(p1);
// For snippets, we want to make sure selection is layered ON TOP
// since we add transparency to the selection color; so rather
// than append the highlight, we insert it in the front.
highlights.insertElementAt(i, 0);
safeDamageRange(p0, p1);
return i;
}
private void doTestDefaultIndent(String code, String insertCode, String expectedResult) throws Exception {
clearWorkDir();
FileObject wd = FileUtil.toFileObject(getWorkDir());
FileObject sourceFile1 = wd.createData("Test1.txt");
EditorCookie ec = sourceFile1.getLookup().lookup(EditorCookie.class);
Document doc = ec.openDocument();
int insertPos = code.indexOf("|");
code = code.replace("|", "");
doc.insertString(0, code, null);
javax.swing.text.Position caret = doc.createPosition(insertPos);
doc.insertString(insertPos, insertCode, null);
List<TextEdit> edits = Utils.computeDefaultOnTypeIndent(doc, insertPos, Utils.createPosition(doc, insertPos), insertCode);
Utils.applyEditsNoLock(doc, edits);
int expectedPos = expectedResult.indexOf("|");
expectedResult = expectedResult.replace("|", "");
assertEquals(expectedResult, doc.getText(0, doc.getLength()));
assertEquals(expectedPos, caret.getOffset());
LifecycleManager.getDefault().saveAll();
}
public void reindent() throws BadLocationException {
Document doc = context.document();
int startOffset = context.startOffset();
int endOffset = context.endOffset();
pushFormattingContextDocument(doc);
try {
// Original formatter does not have reindentation of multiple lines
// so reformat start line and continue for each line.
Element lineRootElem = lineRootElement(doc);
Position endPos = doc.createPosition(endOffset);
do {
startOffset = formatter.indentLine(doc, startOffset);
int startLineIndex = lineRootElem.getElementIndex(startOffset) + 1;
if (startLineIndex >= lineRootElem.getElementCount())
break;
Element lineElem = lineRootElem.getElement(startLineIndex);
startOffset = lineElem.getStartOffset(); // Move to next line
} while (startOffset < endPos.getOffset());
} finally {
popFormattingContextDocument(doc);
}
}
public void actionPerformed(ActionEvent e) {
JTextComponent tc = (JTextComponent) getInvoker();
String sel = tc.getSelectedText();
if (e.getSource() == cutItem) {
tc.cut();
} else if (e.getSource() == copyItem) {
tc.copy();
} else if (e.getSource() == pasteItem) {
tc.paste();
} else if (e.getSource() == selectAllItem) {
tc.selectAll();
} else if (e.getSource() == deleteItem) {
Document doc = tc.getDocument();
int start = tc.getSelectionStart();
int end = tc.getSelectionEnd();
try {
Position p0 = doc.createPosition(start);
Position p1 = doc.createPosition(end);
if ((p0 != null) && (p1 != null)
&& (p0.getOffset() != p1.getOffset())) {
doc.remove(p0.getOffset(), p1.getOffset() - p0.getOffset());
}
} catch (BadLocationException be) {
}
}
}
void setStartOffset(Document doc, int startOffset)
throws BadLocationException {
if (isRootFold()) {
throw new IllegalStateException("Cannot set endOffset of root fold"); // NOI18N
} else {
this.startPos = doc.createPosition(startOffset);
}
}
@Override
public JComponent getToolTip(double x, double y, Shape allocation) {
Container container = getContainer();
if (container instanceof JEditorPane) {
JEditorPane editorPane = (JEditorPane) getContainer();
JEditorPane tooltipPane = new JEditorPane();
EditorKit kit = editorPane.getEditorKit();
Document doc = getDocument();
if (kit != null && doc != null) {
Element lineRootElement = doc.getDefaultRootElement();
tooltipPane.putClientProperty(FoldViewFactory.DISPLAY_ALL_FOLDS_EXPANDED_PROPERTY, true);
try {
// Start-offset of the fold => line start => position
int lineIndex = lineRootElement.getElementIndex(fold.getStartOffset());
Position pos = doc.createPosition(
lineRootElement.getElement(lineIndex).getStartOffset());
// DocumentView.START_POSITION_PROPERTY
tooltipPane.putClientProperty("document-view-start-position", pos); // NOI18N
// End-offset of the fold => line end => position
lineIndex = lineRootElement.getElementIndex(fold.getEndOffset());
pos = doc.createPosition(lineRootElement.getElement(lineIndex).getEndOffset());
// DocumentView.END_POSITION_PROPERTY
tooltipPane.putClientProperty("document-view-end-position", pos); // NOI18N
tooltipPane.putClientProperty("document-view-accurate-span", true); // NOI18N
// Set the same kit and document
tooltipPane.setEditorKit(kit);
tooltipPane.setDocument(doc);
tooltipPane.setEditable(false);
return new FoldToolTip(editorPane, tooltipPane, getBorderColor());
} catch (BadLocationException e) {
// => return null
}
}
}
return null;
}
public void actionPerformed(ActionEvent e) {
JTextComponent tc = (JTextComponent) getInvoker();
@SuppressWarnings("unused")
String sel = tc.getSelectedText();
if (e.getSource() == cutItem) {
tc.cut();
} else if (e.getSource() == copyItem) {
tc.copy();
} else if (e.getSource() == pasteItem) {
tc.paste();
} else if (e.getSource() == selectAllItem) {
tc.selectAll();
} else if (e.getSource() == deleteItem) {
Document doc = tc.getDocument();
int start = tc.getSelectionStart();
int end = tc.getSelectionEnd();
try {
Position p0 = doc.createPosition(start);
Position p1 = doc.createPosition(end);
if ((p0 != null) && (p1 != null)
&& (p0.getOffset() != p1.getOffset())) {
doc.remove(p0.getOffset(), p1.getOffset() - p0.getOffset());
}
} catch (BadLocationException be) {
}
}
}
private void releaseDocAndHoldPosition(Document doc) throws Exception {
doc.insertString(0, "Nazdar", null);
Position pos = doc.createPosition(3);
doc.insertString(2, "abc", null);
assertEquals(6, pos.getOffset());
WeakReference<Document> docRef = new WeakReference<Document>(doc);
doc = null;
assertGC("Doc not released", docRef);
assertEquals(6, pos.getOffset()); // Doc released but position can still be referenced
}
private static Position createPos(Document doc, int offset) {
try {
return doc.createPosition(offset);
} catch (BadLocationException ex) {
throw new IllegalArgumentException("Invalid offset=" + offset + " in doc: " + doc, ex);
}
}
public void testCustomBounds() throws Exception {
loggingOn();
JEditorPane pane = ViewUpdatesTesting.createPane();
Document doc = pane.getDocument();
doc.insertString(0, "hello\nworld\ngood\nmorning", null);
Position startPos = doc.createPosition(3);
pane.putClientProperty(DocumentView.START_POSITION_PROPERTY, startPos);
pane.modelToView(0); // Force rebuild of VH
doc.insertString(startPos.getOffset(), "a", null);
doc.insertString(startPos.getOffset() - 1, "a", null);
Element line0 = doc.getDefaultRootElement().getElement(0);
Position endPos = doc.createPosition(line0.getEndOffset() + 3); // Middle of line 1
pane.putClientProperty(DocumentView.END_POSITION_PROPERTY, endPos);
pane.modelToView(0); // Force rebuild of VH
TestHighlightsViewFactory testFactory = ViewUpdatesTesting.getTestFactory(pane);
List<TestHighlight> hlts = ViewUpdatesTesting.getHighlightsCopy(testFactory);
int hlStartOffset = startPos.getOffset() + 1;
int hlEndOffset = endPos.getOffset() - 1;
TestHighlight hi = TestHighlight.create(doc, hlStartOffset, hlEndOffset, colorAttrs[0]);
hlts.add(hi);
testFactory.setHighlights(hlts);
testFactory.fireChange(hlStartOffset, hlEndOffset);
pane.modelToView(0); // Force rebuild of VH
doc.insertString(doc.getLength(), "test\ntest2", null);
Position endPos2 = doc.createPosition(doc.getLength() - 3);
pane.putClientProperty(DocumentView.END_POSITION_PROPERTY, endPos2);
pane.modelToView(0); // Force rebuild of VH
doc.remove(endPos2.getOffset() - 2, 3);
pane.putClientProperty(DocumentView.START_POSITION_PROPERTY, null);
pane.modelToView(0); // Force rebuild of VH
}
public void testEmptyCustomBounds() throws Exception {
loggingOn();
JEditorPane pane = ViewUpdatesTesting.createPane();
Document doc = pane.getDocument();
pane.modelToView(0);
doc.insertString(0, "hello\nworld\ngood\nmorning", null);
Position startPos = doc.createPosition(3);
pane.putClientProperty(DocumentView.START_POSITION_PROPERTY, startPos);
pane.putClientProperty(DocumentView.END_POSITION_PROPERTY, startPos);
pane.modelToView(0); // Force rebuild of VH
Position endPos = doc.createPosition(2);
pane.putClientProperty(DocumentView.END_POSITION_PROPERTY, endPos);
pane.modelToView(0); // Force rebuild of VH
}
public static Position createPosition(Document doc, int offset) {
try {
return doc.createPosition(offset);
} catch (BadLocationException ex) {
throw new IndexOutOfBoundsException(ex.getMessage());
}
}
/**
* Changes a highlight.
*
* @param tag the highlight tag
* @param p0 the beginning of the range >= 0
* @param p1 the end of the range >= p0
* @exception BadLocationException if the specified location is invalid
*/
public void changeHighlight(Object tag, int p0, int p1) throws BadLocationException {
Document doc = component.getDocument();
if (tag instanceof LayeredHighlightInfo) {
LayeredHighlightInfo lhi = (LayeredHighlightInfo)tag;
if (lhi.width > 0 && lhi.height > 0) {
component.repaint(lhi.x, lhi.y, lhi.width, lhi.height);
}
// Mark the highlights region as invalid, it will reset itself
// next time asked to paint.
lhi.width = lhi.height = 0;
lhi.p0 = doc.createPosition(p0);
lhi.p1 = doc.createPosition(p1);
safeDamageRange(Math.min(p0, p1), Math.max(p0, p1));
}
else {
HighlightInfo info = (HighlightInfo) tag;
int oldP0 = info.p0.getOffset();
int oldP1 = info.p1.getOffset();
if (p0 == oldP0) {
safeDamageRange(Math.min(oldP1, p1),
Math.max(oldP1, p1));
} else if (p1 == oldP1) {
safeDamageRange(Math.min(p0, oldP0),
Math.max(p0, oldP0));
} else {
safeDamageRange(oldP0, oldP1);
safeDamageRange(p0, p1);
}
info.p0 = doc.createPosition(p0);
info.p1 = doc.createPosition(p1);
}
}
/**
* Changes a highlight.
*
* @param tag the highlight tag
* @param p0 the beginning of the range >= 0
* @param p1 the end of the range >= p0
* @exception BadLocationException if the specified location is invalid
*/
public void changeHighlight(Object tag, int p0, int p1) throws BadLocationException {
Document doc = component.getDocument();
if (tag instanceof LayeredHighlightInfo) {
LayeredHighlightInfo lhi = (LayeredHighlightInfo)tag;
if (lhi.width > 0 && lhi.height > 0) {
component.repaint(lhi.x, lhi.y, lhi.width, lhi.height);
}
// Mark the highlights region as invalid, it will reset itself
// next time asked to paint.
lhi.width = lhi.height = 0;
lhi.p0 = doc.createPosition(p0);
lhi.p1 = doc.createPosition(p1);
safeDamageRange(Math.min(p0, p1), Math.max(p0, p1));
}
else {
HighlightInfo info = (HighlightInfo) tag;
int oldP0 = info.p0.getOffset();
int oldP1 = info.p1.getOffset();
if (p0 == oldP0) {
safeDamageRange(Math.min(oldP1, p1),
Math.max(oldP1, p1));
} else if (p1 == oldP1) {
safeDamageRange(Math.min(p0, oldP0),
Math.max(p0, oldP0));
} else {
safeDamageRange(oldP0, oldP1);
safeDamageRange(p0, p1);
}
info.p0 = doc.createPosition(p0);
info.p1 = doc.createPosition(p1);
}
}
@Override
@SuppressWarnings("unchecked")
public void actionPerformed(ActionEvent evt, JTextComponent target) {
if (target != null) {
Caret caret = target.getCaret();
if (!Utilities.isSelectionShowing(caret)) {
try {
int[] identifierBlock = Utilities.getIdentifierBlock((BaseDocument) target.getDocument(), caret.getDot());
if (identifierBlock != null) {
caret.setDot(identifierBlock[0]);
caret.moveDot(identifierBlock[1]);
}
} catch (BadLocationException e) {
LOGGER.log(Level.WARNING, null, e);
}
}
EditorFindSupport findSupport = EditorFindSupport.getInstance();
HashMap<String, Object> props = new HashMap<>(findSupport.createDefaultFindProperties());
String searchWord = target.getSelectedText();
if (searchWord != null) {
int n = searchWord.indexOf('\n');
if (n >= 0) {
searchWord = searchWord.substring(0, n);
}
props.put(EditorFindSupport.FIND_WHAT, searchWord);
Document doc = target.getDocument();
EditorUI eui = org.netbeans.editor.Utilities.getEditorUI(target);
if (eui.getComponent().getClientProperty("AsTextField") == null) { //NOI18N
findSupport.setFocusedTextComponent(eui.getComponent());
}
findSupport.putFindProperties(props);
findSupport.find(null, false);
if (caret instanceof EditorCaret) {
EditorCaret editorCaret = (EditorCaret) caret;
try {
int[] blocks = findSupport.getBlocks(new int[]{-1, -1}, doc, 0, doc.getLength());
if (blocks[0] >= 0 && blocks.length % 2 == 0) {
List<Position> newCarets = new ArrayList<>();
for (int i = 0; i < blocks.length; i += 2) {
int start = blocks[i];
int end = blocks[i + 1];
if (start == -1 || end == -1) {
break;
}
Position startPos = doc.createPosition(start);
Position endPos = doc.createPosition(end);
newCarets.add(endPos);
newCarets.add(startPos);
}
editorCaret.replaceCarets(newCarets, null); // TODO handle biases
}
} catch (BadLocationException ex) {
Exceptions.printStackTrace(ex);
}
}
}
}
}
/**
* Construct new position region based on the knowledge
* of the document and starting and ending offset.
*/
public PositionRegion(Document doc, int startOffset, int endOffset) throws BadLocationException {
this(doc.createPosition(startOffset), doc.createPosition(endOffset));
}