DnD fo JTextPane
Hello all ,
I have one strange problem,
When I drag JTextPane , the text in jtextPane gets selected .
I don't want text inside JTextPane to get selected while dragging.
Morever , the program loops into Mouse dragged event untill I click inside textpane.
I tried the option like making text pane non focusable, and disabling it when dragging , but nothing worked.
if u know the solution , please reply.
Thanks for ur time.
regards,
/Amol
hey please help anybody
Similar Messages
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Open a File in a JTextPane via Drag and Drop
Hi,
I have a simple JTextPane in a Swing App on Windows XP. I would like to know if it is possible for me to be able to add the functionality such that I can drag a text file to the JTextPane and it would open the file inside the Pane. Is this possible? If yes then how do I implement it? (I am not insisting on the app working on non-Win XP systems � so portability is not a concern.)
I have tried to search for the drag and drop stuff but I am confused. First, which interfaces should I implement i.e. DragGestureListener, DragSourceListener, DropTargetListener or what?
I would be grateful for any pointers.
Thanks a lot,
O.O.1. http://java.sun.com/docs/books/tutorial/uiswing/dnd/intro.html - This link did have the information but has since been updated and no longer points to the relevant information that I have since used.
So you where given a link with the appropriate informaton, but Sun has changed the information and you are blaming us for not helping? Unbelievable!
Here is a link to the old tutorial:
https://www.cs.auckland.ac.nz/references/java/java1.5/tutorial/uiswing/dnd/intro.html#importFiles
Now tell us how that does not do exactly what you wanted?
I really don�t know why some people waste their time here just providing you with linksBecause most people like yourself don't know how to ask a question. DnD is a complex topic. The only way to learn it is to read a tutorial and experiment. What a better way to learn than to play with a working example. You are given many working examples in the tutorial.
You did not state wihich example you had changed. You did not state what problems you where having.
The best you could state was "I'm confused". You where asked to clarify your problem/confusion but didn't. We are not mind readers so we couldn't provide further help.
I agree I am wasting my time helping someone who doesn't even appreciate the effort made by the many individuals of the forum and I won't make that mistake again. -
Hello,
We are developing an application that includes DnD of images from Toolbar. My question is what is the best class (e.g JTextPane, JDesktopPane,etc..) that can be used for this. My application also DnD's images from the same component. Eg.
I have a.jpg and b.jpg in JTextPane, I have to DnD a.jpg to b.jpg, but that is only as a physical view the actual images are not moved.
Here is how it works
a.jpg b.jpg
dragging a.jpg dropping a.jpg
Result
a.jpg-------->b.jpg
There is only an arrow mark that can represent that a.jpg has been dropped to b.jpg.
Please guide.
ThanksDon't know what you are meaning...
???? -
ComponentView does not redraw component in JTextPane Cell Rend
We have created a JTable implementation that uses JTextPanes as cell renderers/editors so that text styles and the like are available. We want insert a component, such as a JButton, into the JTextPane. However, the component is only visible when the cell is in an editable state. In the renderer, the ComponentView looks like it has set aside the space where the component is to be, but the component is not visible.
I have looked at this problem for several days now, and have only determined that this seems to be occuring at a low level. What I have found is that the ButtonUI's update method is not called when the document is in the cell renderer, while it seems called continuously in the cell editor (on each caret blink).
Does anybody have any insight as to the problem? I have submitted this as a bug to Sun but wanted to find out if anybody else has come across anything similar to this.
Thank for any help.
Steve Feveile
Here is sample code to reproduce the problem:
// Main Class
* Main frame for the testing of the component not painting. This simplifies
* an issue we have come across when trying to set up using a JTextPane as a
* renderer/editor as the cells in a table.
* Under these conditions we have found that a component inserted into the JTextPanes document
* only appears in the editing state of the cell, whereas the rendering state leaves
* the spacing for the component but does not make it visible.
* Note that creating a JTextPane with the one of these documents will show the component,
* even when not editing.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.table.*;
public class tableFrame extends JFrame
public tableFrame()
//set up frame
getContentPane().setLayout(new BorderLayout());
setSize(500,300);
setTitle("Table Missing Component Test");
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
System.exit(0);
//set up components the table
JTable table = new JTable(createDocumentTableModel(2,2));
table.setRowHeight(60);
//set the default renderer/editor to use the JTextPane implementation
for (int x = 0; x < table.getColumnCount(); x++) {
table.setDefaultEditor(table.getColumnClass(x), new TextPaneCellEditor());
table.setDefaultRenderer(table.getColumnClass(x), new TextPaneRenderer());
JScrollPane pane = new JScrollPane(table);
getContentPane().add(pane, BorderLayout.CENTER);
//this adds a textpane without the table involved
//uising the same way of inserting a document
JTextPane tPane = new JTextPane();
DefaultStyledDocument doc = new DefaultStyledDocument();
try
doc.insertString(0, "Some text in a JTextPane", null);
JButton b = new JButton("Button");
SimpleAttributeSet inputAttributes = new SimpleAttributeSet();
StyleConstants.setComponent(inputAttributes, b);
doc.insertString(0 , " ", inputAttributes);
catch (Throwable t)
System.out.println("createDocumentTableModel error: " + t.getMessage());
tPane.setDocument(doc);
tPane.setSize(490, 60);
JScrollPane pane2 = new JScrollPane(tPane);
getContentPane().add(pane2, BorderLayout.SOUTH);
* this creates a table model where the documents are the value
* in each cell, and the cell renderer/editor can use this instead
* of a string value
private TableModel createDocumentTableModel(int row, int col)
Vector headerData = new Vector();
Vector tableData = new Vector();
for (int i=0;i<row;i++)
headerData.add("Column" + i);
Vector rowData = new Vector();
for (int j=0;j<col;j++)
DefaultStyledDocument doc = new DefaultStyledDocument();
try
//this inserts some string to see that this is visible
//when editing and rendering
doc.insertString(0, ("Row: " + i + ", Column: " + j), null);
//this button will only be visible when the cell is in
//an editing state
JButton b = new JButton("Button" + i + "-" + j);
SimpleAttributeSet inputAttributes = new SimpleAttributeSet();
StyleConstants.setComponent(inputAttributes, b);
doc.insertString(0 , " ", inputAttributes);
catch (Throwable t)
System.out.println("createDocumentTableModel error: " + t.getMessage());
rowData.add(doc);
tableData.add(rowData);
return new DefaultTableModel(tableData, headerData);
//starts the ball rolling
static public void main(String args[])
(new tableFrame()).setVisible(true);
// Custom Cell Editor
* Sets the editor to use a JTextPane implementation
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import javax.swing.event.*;
import java.util.EventObject;
import java.io.Serializable;
import javax.swing.*;
import javax.swing.text.*;
public class TextPaneCellEditor implements TableCellEditor
/** Event listeners */
protected EventListenerList listenerList = new EventListenerList();
transient protected ChangeEvent changeEvent = null;
protected JTextPane editorComponent;
protected EditorDelegate delegate;
protected int clickCountToStart = 1;
* constructor.
public TextPaneCellEditor() {
editorComponent = new JTextPane();
//use 1 click count to edit a cell
clickCountToStart = 1;
* controls the values of the editor
delegate = new EditorDelegate() {
* sets the text value cell.
* @param value - value to set in the document
public void setValue(Object value) {
if (value instanceof Document)
editorComponent.setDocument((Document) value);
else
editorComponent.setText("");
* gets the text value cell.
* @return the document in the textpane
public Object getCellEditorValue() {
return editorComponent.getDocument();
// implements the setting the value for the editor
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
if (value != null)
delegate.setValue(value);
else
delegate.setValue("");
return editorComponent;
// Implementing the CellEditor Interface
// implements javax.swing.CellEditor
public Object getCellEditorValue() {
return delegate.getCellEditorValue();
// implements javax.swing.CellEditor
public boolean isCellEditable(EventObject anEvent) {
if (anEvent instanceof MouseEvent) {
return ((MouseEvent)anEvent).getClickCount() >= clickCountToStart;
return true;
// implements javax.swing.CellEditor
public boolean shouldSelectCell(EventObject anEvent) {
return delegate.shouldSelectCell(anEvent);
// implements javax.swing.CellEditor
public boolean stopCellEditing() {
fireEditingStopped();
return true;
// implements javax.swing.CellEditor
public void cancelCellEditing() {
fireEditingCanceled();
// Handle the event listener bookkeeping
// implements javax.swing.CellEditor
public void addCellEditorListener(CellEditorListener l) {
listenerList.add(CellEditorListener.class, l);
// implements javax.swing.CellEditor
public void removeCellEditorListener(CellEditorListener l) {
listenerList.remove(CellEditorListener.class, l);
* Notify all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @see EventListenerList
protected void fireEditingStopped() {
// 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==CellEditorListener.class) {
// Lazily create the event:
if (changeEvent == null)
changeEvent = new ChangeEvent(this);
((CellEditorListener)listeners[i+1]).editingStopped(changeEvent);
* Notify all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @see EventListenerList
protected void fireEditingCanceled() {
// 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]==CellEditorListener.class) {
// Lazily create the event:
if (changeEvent == null)
changeEvent = new ChangeEvent(this);
((CellEditorListener)listeners[i+1]).editingCanceled(changeEvent);
// Protected EditorDelegate class
protected class EditorDelegate implements ActionListener, ItemListener, Serializable {
//made up of unimplemented methods
protected Object value;
public Object getCellEditorValue() {
return null;
public void setValue(Object x) {}
public void setDocument(Object x) {}
public Document getDocument() {
return null;
public boolean isCellEditable(EventObject anEvent) {
return true;
/** Unfortunately, restrictions on API changes force us to
* declare this method package private.
boolean shouldSelectCell(EventObject anEvent) {
return true;
public boolean startCellEditing(EventObject anEvent) {
return true;
public boolean stopCellEditing() {
return true;
public void cancelCellEditing() {
public void actionPerformed(ActionEvent e) {
fireEditingStopped();
public void itemStateChanged(ItemEvent e) {
fireEditingStopped();
// Custom Cell Renderer
* renders a table cell as a JTextPane.
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.table.*;
public class TextPaneRenderer extends JTextPane implements TableCellRenderer
* Constructor - just set to noneditable
public TextPaneRenderer() {
setEditable(false);
* implementation of table cell renderer. If the value is a document
* the, the text panes setDocument is used, otherwise a string value
* is set
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (value != null)
if (value instanceof Document)
//set the value to a document
setDocument((Document) value);
else
//convert the value to a string
setText(value.toString());
else
//set text to an empty string
setText("");
return this;Hi, I came across the forum and found your problem is very similar to what I am having now. Your post has been a year old, I just wonder if you come up anything productive to what you had? Could you let us know what you (or Sun) find out if you do have one? Thanks.
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Problem with JTextPane and StateInvariantError
Hi. I am having a problem with JTextPanes and changing only certain text to bold. I am writing a chat program and would like to allow users to make certain text in their entries bold. The best way I can think of to do this is to add <b> and </b> tags to the beginning and end of any text that is to be bold. When the other client receives the message, the program will take out all of the <b> and </b> tags and display any text between them as bold (or italic with <i> and </i>). I've searched the forums a lot and figured out several ways to make the text bold, and several ways to determine which text is bold before sending the text, but none that work together. Currently, I add the bold tags with this code: (note: messageDoc is a StyledDocument and messageText is a JTextPane)
public String getMessageText() {
String text = null;
boolean bold = false, italic = false;
for (int i = 0; i < messageDoc.getLength(); i++) {
messageText.setCaretPosition(i);
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bold = true;
if (text != null) {
text = text + "<b>";
else {
text = "<b>";
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else if (!StyleConstants.isBold(messageDoc.getCharacterElement(i).getAttributes()) && bold) {
bold = false;
if (text != null) {
text = text + "</b>";
else {
text = "</b>";
try {
if (text != null) {
text = text + messageDoc.getText(i,1);
else {
text = messageDoc.getText(i, 1);
catch (BadLocationException e) {
System.out.println("An error occurred while getting the text from the message document");
e.printStackTrace();
return text;
} // end getMessageText()When the message is sent to the other client, the program searches through the received message and changes the text between the bold tags to bold. This seems as if it should work, but as soon as I click on the bold button, I get a StateInvariantError. The code for my button is:
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() == bold) {
MutableAttributeSet bold = new SimpleAttributeSet();
StyleConstants.setBold(bold, true);
messageText.getStyledDocument().setCharacterAttributes(messageText.getSelectionStart(), messageText.getSelectionStart() - messageText.getSelectionEnd() - 1, bold, false);
} //end actionPerformed()Can anyone help me to figure out why this error is being thrown? I have searched for a while to figure out this way of doing what I'm trying to do and I've found out that a StateInvariantError has been reported as a bug in several different circumstances but not in relation to this. Or, if there is a better way to add and check the style of the text that would be great as well. Any help is much appreciated, thanks in advance.Swing related questions should be posted in the Swing forum.
Can't tell from you code what the problem is because I don't know the context of how each method is invoked. But it would seem like you are trying to query the data in the Document while the Document is being updated. Try wrapping the getMessageText() method is a SwingUtilities.invokeLater().
There is no need to write custom code for a Bold Action you can just use:
JButton bold = new JButton( new StyledEditorKit.BoldAction() );Also your code to build the text String is not very efficient. You should not be using string concatenation to append text to the string. You should be using a StringBuffer or StringBuilder. -
How to give styles to my HTMLDocument inside a JTextPane?
I have a JTextPane with a HTMLDocument attached to it. How can I style the text which is typed in? For example I want to set a larger font. How can I do this in my example?
Another problem is that when I hit the alignment buttons the text is actually aligned according to the hit button but the JEditorPane doesn't show the text correctly. It also doesn't enter a line feed when typing ENTER key.
Can someone help me on this please?
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
public class AdditionalText extends JFrame implements ActionListener {
private JButton leftAlign;
private JButton centerAlign;
private JButton rightAlign;
private JTextPane editor;
private JButton save;
private JButton dump;
public AdditionalText() {
setTitle("Test Frame");
JPanel topToolbar = new JPanel();
leftAlign = new JButton("Left");
centerAlign = new JButton("Center");
rightAlign = new JButton("Right");
ActionListener alignLeft = new HTMLEditorKit.AlignmentAction("alignLeft", 0);
ActionListener alignCenter = new HTMLEditorKit.AlignmentAction("alignCenter", 1);
ActionListener alignRight = new HTMLEditorKit.AlignmentAction("alignRight", 2);
leftAlign.addActionListener(alignLeft);
centerAlign.addActionListener(alignCenter);
rightAlign.addActionListener(alignRight);
topToolbar.add(leftAlign);
topToolbar.add(centerAlign);
topToolbar.add(rightAlign);
editor = createEditor();
JPanel bottomToolbar = new JPanel();
save = new JButton("Save");
save.addActionListener(this);
dump = new JButton("Dump");
dump.addActionListener(this);
bottomToolbar.add(save);
bottomToolbar.add(dump);
getContentPane().add(BorderLayout.NORTH, topToolbar);
getContentPane().add(BorderLayout.CENTER, editor);
getContentPane().add(BorderLayout.SOUTH, bottomToolbar);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setSize(new Dimension(640, 480));
setLocation((screenSize.width - 640) / 2, (screenSize.height - 480) / 2);
private JTextPane createEditor() {
JTextPane textPane = new JTextPane() {
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
super.paintComponent(g2);
textPane.setEditorKit(new HTMLEditorKit());
return textPane;
public void actionPerformed(ActionEvent e) {
HTMLDocument htmlDocument = (HTMLDocument) editor.getDocument();
if(e.getSource() == save) {
HTMLEditorKit kit = (HTMLEditorKit)editor.getEditorKitForContentType("text/html");
try {
kit.write(System.out, htmlDocument, 0, htmlDocument.getLength());
} catch (IOException ex) {
ex.printStackTrace();
} catch (BadLocationException ex) {
ex.printStackTrace();
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htmlDocument.dump(System.err);
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UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
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e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
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at.show();
}I created a class that can be used to highlight Java source code. Most of the code is for handling multi line comments. If you just want it to highlight certain keywords then you can get rid of all that logic. In case your interested, the code can be downloaded from here:
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Multi-document Application using JTextPane - Issue
Hi.
I'm making a java IDE as a class assignment where the user opens a certain project and all associated files open (i.e. all files in the requested folder). Opening is not an issue but here's the real problem. When a file opens (in the JTextPane), the user should be able to edit it. Although my program enables this, what also happens is that if the user switches onto viewing another file (i.e. clicking a file name from a tree in the file pane) the previously open file obviously closes and nothing is saved. I don't want to save the users edits in the actual file until and unless the user themselves click save, but 'd like the application to store the intermediate state of documents until a save request or until the program is terminated. Is there any easy way of doing this?
Thanks.{color:#000080}Cross posting.{color}
http://forum.java.sun.com/thread.jspa?threadID=5217794&tstart=0
{color:#000080}Cross posting is rude.
db{color} -
How to prevent JTextPane from inserting newline on setText(longLine)
Hi all, I have seen some posts (referenced below) regarding
JTextPane and turning off line wrap. I tried these but still
have some unwanted behavior.
If I insert long html content that has no CRs in it into a JTextPane,
using setText(...)
and then immediatly call getText()
I get back my html content with CRs in it.
how can I prevent this????
In the code below, I insert a long line (html), then call getText()
and JTextPane has inserted a CR after the ffff
visually , in the gui, it did not put a line break there, which is great, but
somewhere in the document model it was inserted
I have code that would break if there are newlines in
strange places like that.
I DO want the html markup from the call to JTextPane.getText()
but not with the additional newlines.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
import javax.swing.border.*;
import java.io.*;
import java.awt.datatransfer.*;
public class MyTextPane extends JTextPane implements MouseListener, ActionListener {
static final long serialVersionUID = 1;
private JPopupMenu popupMenu = null;
private JMenuItem cutMenuItem = null;
private JMenuItem copyMenuItem = null;
private JMenuItem pasteMenuItem = null;
private JMenuItem clearMenuItem = null;
//private JMenuItem selectAllMenuItem = null;
private int startSelectionPosition = -1;
private int endSelectionPosition = -1;
private boolean bTopSeperatorInserted = false;
private int topMenuItemInsertionIndex = 0;
public MyTextPane() {
super();
init();
private void init() {
addMouseListener(this);
java.awt.Font font = new java.awt.Font("Dialog", java.awt.Font.PLAIN, 14);
setFont(font);
createAndConfigurePopupMenu();
startNewDocument();
A FocusListener is also added to our editor. The two methods of this listener, focusGained() and
focusLost(), will be invoked when the editor gains and loses the focus respectively. The purpose of
this implementation is to save and restore the starting and end positions of the text selection.
The reason? -> Swing supports only one text selection at any given time. This means
that if the user selects some text in the editor component to modify it's attributes, and then goes
off and makes a text selection in some other component, the original text selection will disappear.
This can potentially be very annoying to the user. To fix this problem I'll save the selection before
the editor component loses the focus. When the focus is gained we restore the previously saved selection.
I'll distinguish between two possible situations: when the caret is located at the beginning of the
selection and when it is located at the end of the selection. In the first case, position the
caret at the end of the stored interval with the setCaretPosition() method, and then move the
caret backward to the beginning of the stored interval with the moveCaretPosition() method.
The second situation is easily handled using the select() method.
FocusListener focusListener = new FocusListener() {
public void focusGained(FocusEvent e) {
int len = getDocument().getLength();
if (startSelectionPosition>=0 &&
endSelectionPosition>=0 &&
startSelectionPosition<len &&
endSelectionPosition<len)
if (getCaretPosition() == startSelectionPosition) {
setCaretPosition(endSelectionPosition);
moveCaretPosition(startSelectionPosition);
else
select(startSelectionPosition, endSelectionPosition);
public void focusLost(FocusEvent e) {
startSelectionPosition = getSelectionStart();
endSelectionPosition = getSelectionEnd();
addFocusListener(focusListener);
// CONTROL+ALT+S to view HTML source and change it
Action viewSourceAction = new ViewSourceAction();
getActionMap().put("viewSourceAction", viewSourceAction);
InputMap inputMap = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
KeyStroke keyStroke = KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S,
InputEvent.CTRL_MASK+InputEvent.ALT_MASK);
inputMap.put(keyStroke, "viewSourceAction");
// if a merge tag is at the end of a long line, JTextPane
// inserts CR/LF into the middle of the merge tag, like this
// "this is a really long line and at the end is a merge tag <merge \r\n name="Case ID"/>"
// We need to turn off line wrapping to prevent this.
// see http://forum.java.sun.com/thread.jspa?forumID=57&threadID=326017
// overriding setSize(..) and getScrollableTracksViewportWidth()
public void setSize(Dimension d)
if (d.width < getParent().getSize().width)
d.width = getParent().getSize().width;
super.setSize(d);
public boolean getScrollableTracksViewportWidth() { return false; }
class ViewSourceAction extends AbstractAction
public void actionPerformed(ActionEvent e)
try {
HTMLEditorKit m_kit = (HTMLEditorKit)MyTextPane.this.getEditorKit();
HTMLDocument m_doc = (HTMLDocument)MyTextPane.this.getDocument();
StringWriter sw = new StringWriter();
m_kit.write(sw, m_doc, 0, m_doc.getLength());
sw.close();
HtmlSourceDlg dlg = new HtmlSourceDlg(null, sw.toString());
dlg.setVisible(true);
if (!dlg.succeeded())
return;
StringReader sr = new StringReader(dlg.getSource());
m_doc = createDocument();
m_kit.read(sr, m_doc, 0);
sr.close();
setDocument(m_doc);
catch (Exception ex) {
ex.printStackTrace();
private HTMLDocument createDocument() {
HTMLEditorKit htmlEditorKit = new HTMLEditorKit();
StyleSheet styles = htmlEditorKit.getStyleSheet();
StyleSheet ss = new StyleSheet();
ss.addStyleSheet(styles);
HTMLDocument doc = new HTMLDocument(ss);
//doc.setParser(htmlEditorKit.getParser());
//doc.setAsynchronousLoadPriority(4);
//doc.setTokenThreshold(100);
return doc;
public Element getElementByTag(HTML.Tag tag) {
HTMLDocument htmlDocument = (HTMLDocument)getDocument();
Element root = htmlDocument.getDefaultRootElement();
return getElementByTag(root, tag);
public Element getElementByTag(Element parent, HTML.Tag tag) {
if (parent == null || tag == null)
return null;
for (int k=0; k<parent.getElementCount(); k++) {
Element child = parent.getElement(k);
if (child.getAttributes().getAttribute(
StyleConstants.NameAttribute).equals(tag))
return child;
Element e = getElementByTag(child, tag);
if (e != null)
return e;
return null;
public void mouseClicked(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
public void mousePressed(MouseEvent e)
if (e.getModifiers() == MouseEvent.BUTTON3_MASK)
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
if (cb.getContents(this) == null || !isEditable() || !isEnabled()) {
pasteMenuItem.setEnabled(false);
} else {
pasteMenuItem.setEnabled(true);
if (getSelectedText() == null) {
copyMenuItem.setEnabled(false);
cutMenuItem.setEnabled(false);
} else {
copyMenuItem.setEnabled(true);
if ((getBorder() == null) || !isEditable() || !isEnabled()) {
cutMenuItem.setEnabled(false);
} else {
cutMenuItem.setEnabled(true);
popupMenu.show(this,e.getX(),e.getY());
public JPopupMenu getPopupMenu() { return popupMenu; }
* Creates the Popup menu with Cut,Copy,Paste
* menu items if it hasn't already been created.
private void createAndConfigurePopupMenu() {
popupMenu = new JPopupMenu();
clearMenuItem = new JMenuItem(new ClearAction());
clearMenuItem.setText("Clear");
//selectAllMenuItem = new JMenuItem(new SelectAllAction());
//selectAllMenuItem.setText("Select All");
cutMenuItem = new JMenuItem(new DefaultEditorKit.CutAction());
cutMenuItem.setText("Cut");
copyMenuItem = new JMenuItem(new DefaultEditorKit.CopyAction());
copyMenuItem.setText("Copy");
// when pasting, only paste the plain text (not any markup)
PasteAction pasteAction = new PasteAction();
pasteMenuItem = new JMenuItem(/*new DefaultEditorKit.PasteAction()*/);
pasteMenuItem.addActionListener(pasteAction);
pasteMenuItem.setText("Paste");
popupMenu.add(cutMenuItem);
popupMenu.add(copyMenuItem);
popupMenu.add(pasteMenuItem);
popupMenu.add(new JPopupMenu.Separator());
popupMenu.add(clearMenuItem);
//popupMenu.add(selectAllMenuItem);
setKeyStrokes();
private void doPasteAction()
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
Transferable content = cb.getContents(this);
try {
// when pasting, discard the markup
String s = (String)content.getTransferData(DataFlavor.stringFlavor);
HTMLDocument doc = (HTMLDocument)MyTextPane.this.getDocument();
HTMLEditorKit kit = (HTMLEditorKit)MyTextPane.this.getEditorKit();
doc.insertString(MyTextPane.this.getCaretPosition(),
s,
kit.getInputAttributes());
catch (Throwable exc) {
exc.printStackTrace();
class PasteAction implements ActionListener
public void actionPerformed(ActionEvent e) {
doPasteAction();
* Sets the short cut keys and actions for corresponding actions for keys.
private void setKeyStrokes() {
KeyStroke paste = KeyStroke.getKeyStroke(KeyEvent.VK_V,
KeyEvent.CTRL_MASK);
/** Performs pasteAction when short-cut key paste action is performed */
Action pasteAction = new AbstractAction() {
* Handles user clicked actions.
* @param actionEvent -
* ActionEvent object.
public void actionPerformed(ActionEvent actionEvent) {
doPasteAction();
InputMap inputMap = getInputMap(JTextPane.WHEN_FOCUSED);
getActionMap().put(inputMap.get(paste), pasteAction);
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("Select All"))
selectAll();
else if(e.getActionCommand().equals("Clear"))
clear();
public void append(String s) {
super.setText( getText() + s );
public void clear() {
startNewDocument();
public void startNewDocument() {
HTMLEditorKit editorKit = new HTMLEditorKit();
setContentType("text/html");
setEditorKit(editorKit);
HTMLDocument document = (HTMLDocument) editorKit.createDefaultDocument();
setDocument(document);
// to enable the copy and paste from ms word (and others) to the JTextPane, set
// this client property. Sun Bug ID: 4765240
document.putProperty("IgnoreCharsetDirective",Boolean.TRUE);
document.setPreservesUnknownTags(false);
class ClearAction extends AbstractAction{
public void actionPerformed(ActionEvent e) {
startNewDocument();
class SelectAllAction extends AbstractAction{
public void actionPerformed(ActionEvent e) {
selectAll();
class HtmlSourceDlg extends JDialog {
protected boolean m_succeeded = false;
protected JTextArea m_sourceTxt;
public HtmlSourceDlg(JFrame parent, String source) {
super(parent, "HTML Source", true);
JPanel pp = new JPanel(new BorderLayout());
pp.setBorder(new EmptyBorder(10, 10, 5, 10));
m_sourceTxt = new JTextArea(source, 20, 60);
m_sourceTxt.setFont(new Font("Courier", Font.PLAIN, 12));
JScrollPane sp = new JScrollPane(m_sourceTxt);
pp.add(sp, BorderLayout.CENTER);
JPanel p = new JPanel(new FlowLayout());
JPanel p1 = new JPanel(new GridLayout(1, 2, 10, 0));
JButton bt = new JButton("Save");
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
m_succeeded = true;
dispose();
bt.addActionListener(lst);
p1.add(bt);
bt = new JButton("Cancel");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
bt.addActionListener(lst);
p1.add(bt);
p.add(p1);
pp.add(p, BorderLayout.SOUTH);
getContentPane().add(pp, BorderLayout.CENTER);
pack();
setResizable(true);
setLocationRelativeTo(parent);
public boolean succeeded() {
return m_succeeded;
public String getSource() {
return m_sourceTxt.getText();
public void addToPopupMenuAboveEditItems(JMenuItem menuItem)
if (!bTopSeperatorInserted) {
popupMenu.insert(new JPopupMenu.Separator(), 0);
bTopSeperatorInserted = true;
popupMenu.insert(menuItem, topMenuItemInsertionIndex);
++topMenuItemInsertionIndex;
public static void main(String args[])
JFrame frame = new JFrame("MyTextPane");
MyTextPane textPane = new MyTextPane();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scrollPane = new JScrollPane(textPane);
String s = "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa bbbb cccc dddd eeee ffff gggg hhhh iiii jjjj aaaaaaaaaaaaaaaaaaaaaaa</p>";
System.out.println("\nthe long string prior to calling JTextPane.setText(..) WITH NO NEWLINES\ns=" +s);
textPane.setText(s);
System.out.println("\n\nthe text returned from calling JTextPane.setText(..) -> it inserted CR & newline after the ffff\n");
System.out.println("textPane.getText()=" +textPane.getText());
frame.getContentPane().add(scrollPane,BorderLayout.CENTER);
frame.setSize(500, 700);
frame.setVisible(true);
}http://forum.java.sun.com/thread.jspa?threadID=356749&messageID=3012080
and
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=326017
Edited by: henryhamster on Sep 13, 2007 8:59 PMok, I found a somewhat work around. calling JTextPane.getText() eventually
invokes HTMLEditorKit.write()
which does code
HTMLWriter w = new HTMLWriter(out, (HTMLDocument)doc, pos, len);
w.write();the HTMLWriter() constructor above makes this call
setLineLength(80);
So If I extend some classes (JEditorKit and HTMLWriter) I can call invoke
htmlWriter.setLineLength(1000); // ridiculous length to prevent insertion of CR/LF
here is the hack, can someone please tell
me there is an easier way. :-)
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.text.html.*;
import javax.swing.text.*;
import javax.swing.border.*;
import java.io.*;
import java.awt.datatransfer.*;
public class MyTextPane extends JTextPane implements MouseListener,
ActionListener {
static final long serialVersionUID = 1;
private JPopupMenu popupMenu = null;
private JMenuItem cutMenuItem = null;
private JMenuItem copyMenuItem = null;
private JMenuItem pasteMenuItem = null;
private JMenuItem clearMenuItem = null;
// private JMenuItem selectAllMenuItem = null;
private int startSelectionPosition = -1;
private int endSelectionPosition = -1;
private boolean bTopSeperatorInserted = false;
private int topMenuItemInsertionIndex = 0;
public MyTextPane() {
super();
init();
private void init() {
addMouseListener(this);
java.awt.Font font = new java.awt.Font("Dialog", java.awt.Font.PLAIN,
14);
setFont(font);
createAndConfigurePopupMenu();
startNewDocument();
* A FocusListener is also added to our editor. The two methods of this
* listener, focusGained() and focusLost(), will be invoked when the
* editor gains and loses the focus respectively. The purpose of this
* implementation is to save and restore the starting and end positions
* of the text selection. The reason? -> Swing supports only one text
* selection at any given time. This means that if the user selects some
* text in the editor component to modify it's attributes, and then goes
* off and makes a text selection in some other component, the original
* text selection will disappear. This can potentially be very annoying
* to the user. To fix this problem I'll save the selection before the
* editor component loses the focus. When the focus is gained we restore
* the previously saved selection. I'll distinguish between two possible
* situations: when the caret is located at the beginning of the
* selection and when it is located at the end of the selection. In the
* first case, position the caret at the end of the stored interval with
* the setCaretPosition() method, and then move the caret backward to
* the beginning of the stored interval with the moveCaretPosition()
* method. The second situation is easily handled using the select()
* method.
FocusListener focusListener = new FocusListener() {
public void focusGained(FocusEvent e) {
int len = getDocument().getLength();
if (startSelectionPosition >= 0 && endSelectionPosition >= 0
&& startSelectionPosition < len
&& endSelectionPosition < len) {
if (getCaretPosition() == startSelectionPosition) {
setCaretPosition(endSelectionPosition);
moveCaretPosition(startSelectionPosition);
} else
select(startSelectionPosition, endSelectionPosition);
public void focusLost(FocusEvent e) {
startSelectionPosition = getSelectionStart();
endSelectionPosition = getSelectionEnd();
addFocusListener(focusListener);
// CONTROL+ALT+S to view HTML source and change it
Action viewSourceAction = new ViewSourceAction();
getActionMap().put("viewSourceAction", viewSourceAction);
InputMap inputMap = getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
KeyStroke keyStroke = KeyStroke.getKeyStroke(
java.awt.event.KeyEvent.VK_S, InputEvent.CTRL_MASK
+ InputEvent.ALT_MASK);
inputMap.put(keyStroke, "viewSourceAction");
// if a merge tag is at the end of a long line, JTextPane
// inserts CR/LF into the middle of the merge tag, like this
// "this is a really long line and at the end is a merge tag <merge \r\n
// name="Case ID"/>"
// We need to turn off line wrapping to prevent this.
// see http://forum.java.sun.com/thread.jspa?forumID=57&threadID=326017
// overriding setSize(..) and getScrollableTracksViewportWidth()
public void setSize(Dimension d) {
if (d.width < getParent().getSize().width)
d.width = getParent().getSize().width;
super.setSize(d);
public boolean getScrollableTracksViewportWidth() {
return false;
class ViewSourceAction extends AbstractAction {
public void actionPerformed(ActionEvent e) {
try {
HTMLEditorKit m_kit = (HTMLEditorKit) MyTextPane.this
.getEditorKit();
HTMLDocument m_doc = (HTMLDocument) MyTextPane.this
.getDocument();
StringWriter sw = new StringWriter();
m_kit.write(sw, m_doc, 0, m_doc.getLength());
sw.close();
HtmlSourceDlg dlg = new HtmlSourceDlg(null, sw.toString());
dlg.setVisible(true);
if (!dlg.succeeded())
return;
StringReader sr = new StringReader(dlg.getSource());
m_doc = createDocument();
m_kit.read(sr, m_doc, 0);
sr.close();
setDocument(m_doc);
} catch (Exception ex) {
ex.printStackTrace();
private HTMLDocument createDocument() {
HTMLEditorKit htmlEditorKit = new HTMLEditorKit();
StyleSheet styles = htmlEditorKit.getStyleSheet();
StyleSheet ss = new StyleSheet();
ss.addStyleSheet(styles);
HTMLDocument doc = new HTMLDocument(ss);
// doc.setParser(htmlEditorKit.getParser());
// doc.setAsynchronousLoadPriority(4);
// doc.setTokenThreshold(100);
return doc;
public Element getElementByTag(HTML.Tag tag) {
HTMLDocument htmlDocument = (HTMLDocument) getDocument();
Element root = htmlDocument.getDefaultRootElement();
return getElementByTag(root, tag);
public Element getElementByTag(Element parent, HTML.Tag tag) {
if (parent == null || tag == null)
return null;
for (int k = 0; k < parent.getElementCount(); k++) {
Element child = parent.getElement(k);
if (child.getAttributes()
.getAttribute(StyleConstants.NameAttribute).equals(tag))
return child;
Element e = getElementByTag(child, tag);
if (e != null)
return e;
return null;
public void mouseClicked(MouseEvent e) {
public void mouseEntered(MouseEvent e) {
public void mouseExited(MouseEvent e) {
public void mouseReleased(MouseEvent e) {
public void mousePressed(MouseEvent e) {
if (e.getModifiers() == MouseEvent.BUTTON3_MASK) {
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
if (cb.getContents(this) == null || !isEditable() || !isEnabled()) {
pasteMenuItem.setEnabled(false);
} else {
pasteMenuItem.setEnabled(true);
if (getSelectedText() == null) {
copyMenuItem.setEnabled(false);
cutMenuItem.setEnabled(false);
} else {
copyMenuItem.setEnabled(true);
if ((getBorder() == null) || !isEditable() || !isEnabled()) {
cutMenuItem.setEnabled(false);
} else {
cutMenuItem.setEnabled(true);
popupMenu.show(this, e.getX(), e.getY());
public JPopupMenu getPopupMenu() {
return popupMenu;
* Creates the Popup menu with Cut,Copy,Paste menu items if it hasn't
* already been created.
private void createAndConfigurePopupMenu() {
popupMenu = new JPopupMenu();
clearMenuItem = new JMenuItem(new ClearAction());
clearMenuItem.setText("Clear");
// selectAllMenuItem = new JMenuItem(new SelectAllAction());
// selectAllMenuItem.setText("Select All");
cutMenuItem = new JMenuItem(new DefaultEditorKit.CutAction());
cutMenuItem.setText("Cut");
copyMenuItem = new JMenuItem(new DefaultEditorKit.CopyAction());
copyMenuItem.setText("Copy");
// when pasting, only paste the plain text (not any markup)
PasteAction pasteAction = new PasteAction();
pasteMenuItem = new JMenuItem(/* new DefaultEditorKit.PasteAction() */);
pasteMenuItem.addActionListener(pasteAction);
pasteMenuItem.setText("Paste");
popupMenu.add(cutMenuItem);
popupMenu.add(copyMenuItem);
popupMenu.add(pasteMenuItem);
popupMenu.add(new JPopupMenu.Separator());
popupMenu.add(clearMenuItem);
// popupMenu.add(selectAllMenuItem);
setKeyStrokes();
private void doPasteAction() {
Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
Transferable content = cb.getContents(this);
try {
// when pasting, discard the markup
String s = (String) content
.getTransferData(DataFlavor.stringFlavor);
HTMLDocument doc = (HTMLDocument) MyTextPane.this.getDocument();
HTMLEditorKit kit = (HTMLEditorKit) MyTextPane.this.getEditorKit();
doc.insertString(MyTextPane.this.getCaretPosition(), s, kit
.getInputAttributes());
} catch (Throwable exc) {
exc.printStackTrace();
class PasteAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
doPasteAction();
* Sets the short cut keys and actions for corresponding actions for keys.
private void setKeyStrokes() {
KeyStroke paste = KeyStroke.getKeyStroke(KeyEvent.VK_V,
KeyEvent.CTRL_MASK);
/** Performs pasteAction when short-cut key paste action is performed */
Action pasteAction = new AbstractAction() {
* Handles user clicked actions.
* @param actionEvent -
* ActionEvent object.
public void actionPerformed(ActionEvent actionEvent) {
doPasteAction();
InputMap inputMap = getInputMap(JTextPane.WHEN_FOCUSED);
getActionMap().put(inputMap.get(paste), pasteAction);
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Select All"))
selectAll();
else if (e.getActionCommand().equals("Clear"))
clear();
public void append(String s) {
super.setText(getText() + s);
public void clear() {
startNewDocument();
public void startNewDocument() {
MyHTMLEditorKit editorKit = new MyHTMLEditorKit();
setContentType("text/html");
setEditorKit(editorKit);
HTMLDocument document = (HTMLDocument) editorKit
.createDefaultDocument();
setDocument(document);
// to enable the copy and paste from ms word (and others) to the
// JTextPane, set
// this client property. Sun Bug ID: 4765240
document.putProperty("IgnoreCharsetDirective", Boolean.TRUE);
document.setPreservesUnknownTags(false);
class ClearAction extends AbstractAction {
public void actionPerformed(ActionEvent e) {
startNewDocument();
class SelectAllAction extends AbstractAction {
public void actionPerformed(ActionEvent e) {
selectAll();
class HtmlSourceDlg extends JDialog {
protected boolean m_succeeded = false;
protected JTextArea m_sourceTxt;
public HtmlSourceDlg(JFrame parent, String source) {
super(parent, "HTML Source", true);
JPanel pp = new JPanel(new BorderLayout());
pp.setBorder(new EmptyBorder(10, 10, 5, 10));
m_sourceTxt = new JTextArea(source, 20, 60);
m_sourceTxt.setFont(new Font("Courier", Font.PLAIN, 12));
JScrollPane sp = new JScrollPane(m_sourceTxt);
pp.add(sp, BorderLayout.CENTER);
JPanel p = new JPanel(new FlowLayout());
JPanel p1 = new JPanel(new GridLayout(1, 2, 10, 0));
JButton bt = new JButton("Save");
ActionListener lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
m_succeeded = true;
dispose();
bt.addActionListener(lst);
p1.add(bt);
bt = new JButton("Cancel");
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
dispose();
bt.addActionListener(lst);
p1.add(bt);
p.add(p1);
pp.add(p, BorderLayout.SOUTH);
getContentPane().add(pp, BorderLayout.CENTER);
pack();
setResizable(true);
setLocationRelativeTo(parent);
public boolean succeeded() {
return m_succeeded;
public String getSource() {
return m_sourceTxt.getText();
public void addToPopupMenuAboveEditItems(JMenuItem menuItem) {
if (!bTopSeperatorInserted) {
popupMenu.insert(new JPopupMenu.Separator(), 0);
bTopSeperatorInserted = true;
popupMenu.insert(menuItem, topMenuItemInsertionIndex);
++topMenuItemInsertionIndex;
public static void main(String args[]) {
JFrame frame = new JFrame("MyTextPane");
MyTextPane textPane = new MyTextPane();
HTMLDocument doc = (HTMLDocument) textPane.getDocument();
HTMLEditorKit kit = (HTMLEditorKit) textPane.getEditorKit();
StringWriter buf = new StringWriter();
// MyHTMLWriter w = new MyHTMLWriter(buf, (HTMLDocument) doc, 0,
// doc.getLength());
// w.setLineLength(150);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scrollPane = new JScrollPane(textPane);
String s = "<p>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa bbbb cccc dddd eeee ffff gggg hhhh iiii jjjj aaaaaaaaaaaaaaaaaaaaaaa</p>";
System.out
.println("\nthe long string prior to calling JTextPane.setText(..) WITH NO NEWLINES\ns="
+ s);
textPane.setText(s);
String sOut = textPane.getText();
System.out
.println("\n\nthe text returned from calling JTextPane.setText(..) -> it inserted CR & newline after the ffff\n");
System.out.println("textPane.getText()=" + sOut);
frame.getContentPane().add(scrollPane, BorderLayout.CENTER);
frame.setSize(500, 700);
frame.setVisible(true);
class MyHTMLWriter extends HTMLWriter {
public MyHTMLWriter(Writer buf, HTMLDocument doc, int pos, int len) {
super(buf, doc, pos, len);
protected void setLineLength(int l) {
super.setLineLength(l);
class MyHTMLEditorKit extends HTMLEditorKit {
public void write(Writer out, Document doc, int pos, int len)
throws IOException, BadLocationException {
if (doc instanceof HTMLDocument) {
MyHTMLWriter w = new MyHTMLWriter(out, (HTMLDocument) doc, pos, len);
w.setLineLength(200);
w.write();
} else if (doc instanceof StyledDocument) {
MinimalHTMLWriter w = new MinimalHTMLWriter(out,
(StyledDocument) doc, pos, len);
w.write();
} else {
super.write(out, doc, pos, len);
}and -
How to get exact height of HTML line with SUB tag in JTextPane?
Hi, this is my first post. I`ve been searching forum for an answer for a week, but didn`t find one.
I have HTMLDocument inside JTextPane(exacty inside my class that extends it - MyTextPane). I want to do some custom painting in JTextPane so I need to be able to know exact pixel witdh for each line in the document. Easy except one thing, when I use SUB tag the width of the line cannot be simply calculated using FontMetrics, because I don`t know if the text inside SUB tag has lower font size and I don`t know its Y offset to normal line.
I tried get these information from HTMLDocument using attributes from leafElements representing lines, but there seems to be a problem too.
I pass this text:
"(1) Line<SUB>jW</SUB><BR>(2) TextB"
to setText method of MyTextPane, this method is overriden so it changes text Font
public void setText(String s) {
super.setText(s);
setJTextPaneFont(this, new Font("Arial",Font.PLAIN,36), Color.black);
}This is how the Element Structure looks like:
Format is Element +": "+elementText+"|"+fontFamily+" "+fontSize
BranchElement(html) 0,22: \n(1)?LinejW (2)?TextB\n|Monospaced 12
---BranchElement(head) 0,1: \n|Monospaced 12
------BranchElement(p-implied) 0,1: \n|Monospaced 12
---------LeafElement(content) 0,1: \n|Arial 36
---BranchElement(body) 1,22: (1) LinejW (2) TextB\n|Monospaced 12
------BranchElement(p-implied) 1,22: (1) LinejW (2) TextB\n|Monospaced 12
---------LeafElement(content) 1,9: (1) Line|Arial 36
---------LeafElement(content) 9,11: jW|Arial 36 <-----------THIS IS THE LOWER INDEX
---------LeafElement(content) 11,12: |Arial 36 <-----------THIS IS just space character '\u020'
---------LeafElement(content) 12,21: (2) TextB|Arial 36
---------LeafElement(content) 21,22: \n|Arial 36
The height of Arial 36 is according to FontMetrics 43(and it really is), but height of the lowerIndex is just 40 pixels(on the screen), not 43 as I would expect. And I still dont have offset, where does the lower index starts paint itself.
Is there any problem with my setText method, so that it changes font style for LOWER INDEX?
I am using JTextPane as notEditable, with just one font style for entire document.
Any suggestion?Is there any other way to get these information. I just found that I need that information before I put text it in the document.
For example I am would like to generate lines:
paragraph1 - text1
text2
paragraph2 - text1
text2
text3
paragraph3<SUB>some note</SUB> - text1
text2
normal text line
I know what font line will be and I know its AttributeSet. I am trying to get appropriate number of spaces (or left indent) for text2,text3...lines. Then I will pass that string to setText method of JTextPane.
I am unable to get appropriate width for "paragraph3<SUB>some note</SUB> - ", since text in SUB tag uses probably different font size.
I am really sorry to bother again. I will think twice what I need before I posting.
You`ve been very helpful so far Stas.
Thanks. -
Display image in JTextPane (JEditorPane)
I'm writing an application with JTable and a JTextPane. When selecting a column in the JTable, I want to display the image associated with the selected row in the JTextPane.
This wouldn't be a problem if the darn JTextPane would just display JUST AN IMAGE. But a JTextPane only displays an image if its embedded in an HTML file. Ugh. That would mean I'd have to create an html file for each picture. Ugh again.
Is there any way around this?Nevermind, figured it out. Just have to use setText instead of setPage.
htmlPane.setText("<IMG src='"+url+"'>");instead of:
htmlPane.setPage(url); -
DnD icon won't go away on Redhat 9
Background:
I recently updated my OS to RedHat 9 (2.4.20-6). Previously on Redhat 7.3 (kernel upgraded to 2.4.18ish) everything worked OK.
java -version
java version "1.4.1-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b14)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b14, mixed mode)
Problem:
After dragging and dropping an object the drag icon/cursor turns black/reverse-video and does not go away until I drag another object or move the icon/cursor out of the window. The problem did not occur before my upgrade so I imaging it is not a java problem. I would like to know if anyone can repeat the problem or if anyone else has seen it. One Caveate... if you do anything after the drop that causes an icon repaint (like the OptionPane that is commented out in the code below) the problem does not appear. I have not been able to reproduce the problem outside of java.
thanks
Brad
Example:
This code by Gupta is a simple example to demonstrate the problem.
file DNDComponentInterface.java
<code>
public interface DNDComponentInterface{
public void addElement( Object s);
public void removeElement();
</code>
file DNDList.java
<code>
/**his is an example of a component, which serves as a DragSource as
* well as Drop Target.
* To illustrate the concept, JList has been used as a droppable target
* and a draggable source.
* Any component can be used instead of a JList.
* The code also contains debugging messages which can be used for
* diagnostics and understanding the flow of events.
* @version 1.0
import java.awt.*;
import java.awt.dnd.*;
import java.awt.datatransfer.*;
import java.util.Hashtable;
import java.util.List;
import java.util.Iterator;
import java.io.*;
import java.io.IOException;
import javax.swing.*;
import javax.swing.JList;
import javax.swing.DefaultListModel;
public class DNDList extends JList
implements DNDComponentInterface, DropTargetListener,DragSourceListener, DragGestureListener {
* enables this component to be a dropTarget
DropTarget dropTarget = null;
* enables this component to be a Drag Source
DragSource dragSource = null;
* constructor - initializes the DropTarget and DragSource.
public DNDList() {
dropTarget = new DropTarget (this, this);
dragSource = new DragSource();
dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_MOVE, this);
* is invoked when you are dragging over the DropSite
public void dragEnter (DropTargetDragEvent event) {
// debug messages for diagnostics
System.out.println( "dragEnter");
event.acceptDrag (DnDConstants.ACTION_MOVE);
* is invoked when you are exit the DropSite without dropping
public void dragExit (DropTargetEvent event) {
System.out.println( "dragExit");
* is invoked when a drag operation is going on
public void dragOver (DropTargetDragEvent event) {
System.out.println( "dragOver");
* a drop has occurred
public void drop (DropTargetDropEvent event) {
try {
Transferable transferable = event.getTransferable();
// we accept only Strings
if (transferable.isDataFlavorSupported (DataFlavor.stringFlavor)){
// KBS
//event.acceptDrop(DnDConstants.ACTION_MOVE);
//event.getDropTargetContext().dropComplete(true);
// KBS
// KBS Added this
/* You must leave this commented out to replicate the DND icon ghost problem
int answer = JOptionPane.showConfirmDialog(this,
"Are you sure?",
"Warning",
JOptionPane.YES_NO_OPTION);
int answer = JOptionPane.YES_OPTION;
if (answer == JOptionPane.YES_OPTION)
// KBS To here
event.acceptDrop(DnDConstants.ACTION_MOVE);
String s = (String)transferable.getTransferData ( DataFlavor.stringFlavor);
addElement( s );
event.getDropTargetContext().dropComplete(true);
// KBS Added this
// KBS To here
else{
event.rejectDrop();
catch (IOException exception) {
exception.printStackTrace();
System.err.println( "Exception" + exception.getMessage());
event.rejectDrop();
catch (UnsupportedFlavorException ufException ) {
ufException.printStackTrace();
System.err.println( "Exception" + ufException.getMessage());
event.rejectDrop();
* is invoked if the use modifies the current drop gesture
public void dropActionChanged ( DropTargetDragEvent event ) {
* a drag gesture has been initiated
public void dragGestureRecognized( DragGestureEvent event) {
Object selected = getSelectedValue();
if ( selected != null ){
StringSelection text = new StringSelection( selected.toString());
// as the name suggests, starts the dragging
dragSource.startDrag (event, DragSource.DefaultMoveDrop, text, this);
} else {
System.out.println( "nothing was selected");
* this message goes to DragSourceListener, informing it that the dragging
* has ended
public void dragDropEnd (DragSourceDropEvent event) {
if ( event.getDropSuccess()){
removeElement();
* this message goes to DragSourceListener, informing it that the dragging
* has entered the DropSite
public void dragEnter (DragSourceDragEvent event) {
System.out.println( " dragEnter");
* this message goes to DragSourceListener, informing it that the dragging
* has exited the DropSite
public void dragExit (DragSourceEvent event) {
System.out.println( "dragExit");
* this message goes to DragSourceListener, informing it that the dragging is currently
* ocurring over the DropSite
public void dragOver (DragSourceDragEvent event) {
System.out.println( "dragExit");
* is invoked when the user changes the dropAction
public void dropActionChanged ( DragSourceDragEvent event) {
System.out.println( "dropActionChanged");
* adds elements to itself
public void addElement( Object s ){
(( DefaultListModel )getModel()).addElement (s.toString());
* removes an element from itself
public void removeElement(){
(( DefaultListModel)getModel()).removeElement( getSelectedValue());
</code>
file TestDND.java
<code.
* The tester class for the DNDList. This class creates the lists,
* positions them in a frame, populates the list with the default
* data.
* @version 1.0
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestDND
public static void main (String args[]) {
TestDND testDND = new TestDND();
* constructor
* creates the frame, the lists in it and sets the data in the lists
public TestDND()
JFrame f = new JFrame("Drag and Drop Lists");
DNDList sourceList = new DNDList();
// add data to the source List
DefaultListModel sourceModel = new DefaultListModel();
sourceModel.addElement( "Source Item1");
sourceModel.addElement( "Source Item2");
sourceModel.addElement( "Source Item3");
sourceModel.addElement( "Source Item4");
// gets the panel with the List and a heading for the List
JPanel sourcePanel = getListPanel(sourceList, "SourceList", sourceModel);
DNDList targetList = new DNDList();
// add data to the target List
DefaultListModel targetModel = new DefaultListModel();
targetModel.addElement( "Target Item1");
targetModel.addElement( "Target Item2");
targetModel.addElement( "Target Item3");
targetModel.addElement( "Target Item4");
JPanel targetPanel = getListPanel(targetList, "TargetList", targetModel);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.X_AXIS));
mainPanel.add( sourcePanel );
mainPanel.add( targetPanel );
f.getContentPane().add( mainPanel );
f.setSize (300, 300);
f.addWindowListener (new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
f.setVisible (true);
* a convenience method
* used for positioning of the ListBox and the Label.
* @param list - the special DND List
* @param labelName - the heading for the list
* @param listModel - model for the list
private JPanel getListPanel(DNDList list, String labelName, DefaultListModel listModel ){
JPanel listPanel = new JPanel();
JScrollPane scrollPane = new JScrollPane(list);
list.setModel(listModel);
JLabel nameListName = new JLabel(labelName );
listPanel.setLayout( new BorderLayout());
listPanel.add(nameListName, BorderLayout.NORTH);
listPanel.add( scrollPane, BorderLayout.CENTER);
return listPanel;
</code>HI,
Try Resetting your iPhone
Carolyn -
Hi Experts;
How do I add a caret listener on this code so that it will just add a number
when the user goes to the next line.
import java.awt.*;
import javax.swing.*;
public class LineNumber extends JComponent
private final static Color DEFAULT_BACKGROUND = new Color(213, 213, 234);
private final static Color DEFAULT_FOREGROUND = Color.white;
private final static Font DEFAULT_FONT = new Font("arial", Font.PLAIN, 11);
// LineNumber height (abends when I use MAX_VALUE)
private final static int HEIGHT = Integer.MAX_VALUE - 1000000;
// Set right/left margin
private final static int MARGIN = 5;
// Line height of this LineNumber component
private int lineHeight;
// Line height of this LineNumber component
private int fontLineHeight;
// With of the LineNumber component
private int currentRowWidth;
// Metrics of this LineNumber component
private FontMetrics fontMetrics;
* Convenience constructor for Text Components
public LineNumber(JComponent component)
if (component == null)
setBackground( DEFAULT_BACKGROUND );
setForeground( DEFAULT_FOREGROUND );
setFont( DEFAULT_FONT );
else
setBackground( DEFAULT_BACKGROUND );
setForeground( DEFAULT_FOREGROUND );
setFont( component.getFont() );
setPreferredSize( 99 );
public void setPreferredSize(int row)
int width = fontMetrics.stringWidth( String.valueOf(row) );
if (currentRowWidth < width)
currentRowWidth = width;
setPreferredSize( new Dimension(2 * MARGIN + width, HEIGHT) );
public void setFont(Font font)
super.setFont(font);
fontMetrics = getFontMetrics( getFont() );
fontLineHeight = fontMetrics.getHeight();
* The line height defaults to the line height of the font for this
* component. The line height can be overridden by setting it to a
* positive non-zero value.
public int getLineHeight()
if (lineHeight == 0)
return fontLineHeight;
else
return lineHeight;
public void setLineHeight(int lineHeight)
if (lineHeight > 0)
this.lineHeight = lineHeight;
public int getStartOffset()
return 4;
public void paintComponent(Graphics g)
int lineHeight = getLineHeight();
int startOffset = getStartOffset();
Rectangle drawHere = g.getClipBounds();
g.setColor( getBackground() );
g.fillRect(drawHere.x, drawHere.y, drawHere.width, drawHere.height);
g.setColor( getForeground() );
int startLineNumber = (drawHere.y / lineHeight) + 1;
int endLineNumber = startLineNumber + (drawHere.height / lineHeight);
int start = (drawHere.y / lineHeight) * lineHeight + lineHeight - startOffset;
for (int i = startLineNumber; i <= endLineNumber; i++)
String lineNumber = String.valueOf(i);
int width = fontMetrics.stringWidth( lineNumber );
g.drawString(lineNumber, MARGIN + currentRowWidth - width, start);
start += lineHeight;
setPreferredSize( endLineNumber );
} Thanks for your time . . .
The_DeveloperHere's what I use. It behaves correctly WRT wrapped lines, and should work equally well with a JTextArea or a JTextPane.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.SizeSequence;
import javax.swing.UIManager;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
* LineNumberView is a simple line-number gutter that works correctly
* even when lines are wrapped in the associated text component. This
* is meant to be used as the RowHeaderView in a JScrollPane that
* contains the associated text component. Example usage:
*<pre>
* JTextArea ta = new JTextArea();
* ta.setLineWrap(true);
* ta.setWrapStyleWord(true);
* JScrollPane sp = new JScrollPane(ta);
* sp.setRowHeaderView(new LineNumberView(ta));
*</pre>
* @author Alan Moore
public class LineNumberView extends JComponent
// This is for the border to the right of the line numbers.
// There's probably a UIDefaults value that could be used for this.
private static final Color BORDER_COLOR = Color.GRAY;
private static final int WIDTH_TEMPLATE = 99999;
private static final int MARGIN = 5;
private FontMetrics viewFontMetrics;
private int maxNumberWidth;
private int componentWidth;
private int textTopInset;
private int textFontAscent;
private int textFontHeight;
private JTextComponent text;
private SizeSequence sizes;
private int startLine = 0;
private boolean structureChanged = true;
* Construct a LineNumberView and attach it to the given text component.
* The LineNumberView will listen for certain kinds of events from the
* text component and update itself accordingly.
* @param startLine the line that changed, if there's only one
* @param structureChanged if <tt>true</tt>, ignore the line number and
* update all the line heights.
public LineNumberView(JTextComponent text)
if (text == null)
throw new IllegalArgumentException("Text component cannot be null");
this.text = text;
updateCachedMetrics();
UpdateHandler handler = new UpdateHandler();
text.getDocument().addDocumentListener(handler);
text.addPropertyChangeListener(handler);
text.addComponentListener(handler);
setBorder(BorderFactory.createMatteBorder(0, 0, 0, 1, BORDER_COLOR));
* Schedule a repaint because one or more line heights may have changed.
* @param startLine the line that changed, if there's only one
* @param structureChanged if <tt>true</tt>, ignore the line number and
* update all the line heights.
private void viewChanged(int startLine, boolean structureChanged)
this.startLine = startLine;
this.structureChanged = structureChanged;
revalidate();
repaint();
/** Update the line heights as needed. */
private void updateSizes()
if (startLine < 0)
return;
if (structureChanged)
int count = getAdjustedLineCount();
sizes = new SizeSequence(count);
for (int i = 0; i < count; i++)
sizes.setSize(i, getLineHeight(i));
structureChanged = false;
else
sizes.setSize(startLine, getLineHeight(startLine));
startLine = -1;
/* Copied from javax.swing.text.PlainDocument */
private int getAdjustedLineCount()
// There is an implicit break being modeled at the end of the
// document to deal with boundary conditions at the end. This
// is not desired in the line count, so we detect it and remove
// its effect if throwing off the count.
Element map = text.getDocument().getDefaultRootElement();
int n = map.getElementCount();
Element lastLine = map.getElement(n - 1);
if ((lastLine.getEndOffset() - lastLine.getStartOffset()) > 1)
return n;
return n - 1;
* Get the height of a line from the JTextComponent.
* @param index the line number
* @param the height, in pixels
private int getLineHeight(int index)
int lastPos = sizes.getPosition(index) + textTopInset;
int height = textFontHeight;
try
Element map = text.getDocument().getDefaultRootElement();
int lastChar = map.getElement(index).getEndOffset() - 1;
Rectangle r = text.modelToView(lastChar);
height = (r.y - lastPos) + r.height;
catch (BadLocationException ex)
ex.printStackTrace();
return height;
* Cache some values that are used a lot in painting or size
* calculations. Also ensures that the line-number font is not
* larger than the text component's font (by point-size, anyway).
private void updateCachedMetrics()
Font textFont = text.getFont();
FontMetrics fm = getFontMetrics(textFont);
textFontHeight = fm.getHeight();
textFontAscent = fm.getAscent();
textTopInset = text.getInsets().top;
Font viewFont = getFont();
boolean changed = false;
if (viewFont == null)
viewFont = UIManager.getFont("Label.font");
changed = true;
if (viewFont.getSize() > textFont.getSize())
viewFont = viewFont.deriveFont(textFont.getSize2D());
changed = true;
viewFontMetrics = getFontMetrics(viewFont);
maxNumberWidth = viewFontMetrics.stringWidth(String.valueOf(WIDTH_TEMPLATE));
componentWidth = 2 * MARGIN + maxNumberWidth;
if (changed)
super.setFont(viewFont);
public Dimension getPreferredSize()
return new Dimension(componentWidth, text.getHeight());
public void setFont(Font font)
super.setFont(font);
updateCachedMetrics();
public void paintComponent(Graphics g)
updateSizes();
Rectangle clip = g.getClipBounds();
g.setColor(getBackground());
g.fillRect(clip.x, clip.y, clip.width, clip.height);
g.setColor(getForeground());
int base = clip.y - textTopInset;
int first = sizes.getIndex(base);
int last = sizes.getIndex(base + clip.height);
String text = "";
for (int i = first; i <= last; i++)
text = String.valueOf(i+1);
int x = MARGIN + maxNumberWidth - viewFontMetrics.stringWidth(text);
int y = sizes.getPosition(i) + textFontAscent + textTopInset;
g.drawString(text, x, y);
class UpdateHandler extends ComponentAdapter
implements PropertyChangeListener, DocumentListener
* The text component was resized. 'Nuff said.
public void componentResized(ComponentEvent evt)
viewChanged(0, true);
* A bound property was changed on the text component. Properties
* like the font, border, and tab size affect the layout of the
* whole document, so we invalidate all the line heights here.
public void propertyChange(PropertyChangeEvent evt)
Object oldValue = evt.getOldValue();
Object newValue = evt.getNewValue();
String propertyName = evt.getPropertyName();
if ("document".equals(propertyName))
if (oldValue != null && oldValue instanceof Document)
((Document)oldValue).removeDocumentListener(this);
if (newValue != null && newValue instanceof Document)
((Document)newValue).addDocumentListener(this);
updateCachedMetrics();
viewChanged(0, true);
* Text was inserted into the document.
public void insertUpdate(DocumentEvent evt)
update(evt);
* Text was removed from the document.
public void removeUpdate(DocumentEvent evt)
update(evt);
* Text attributes were changed. In a source-code editor based on
* StyledDocument, attribute changes should be applied automatically
* in response to inserts and removals. Since we're already
* listening for those, this method should be redundant, but YMMV.
public void changedUpdate(DocumentEvent evt)
// update(evt);
* If the edit was confined to a single line, invalidate that
* line's height. Otherwise, invalidate them all.
private void update(DocumentEvent evt)
Element map = text.getDocument().getDefaultRootElement();
int line = map.getElementIndex(evt.getOffset());
DocumentEvent.ElementChange ec = evt.getChange(map);
viewChanged(line, ec != null);
} -
Hi,
I am facing huge memory leak problems with JTextArea/JTextPane. After considerable investigation, I found out that the Document associated with the component is not being GC'ed properly. I ran OptimizeIt and found out that the memory is being consumed by the JTextPane.setText() method. I have implmented a HTML viewer to display large amounts of HTML data and it is leaking memory like crazy on each successive execution. Any thoughts ??
JDK1.4.2_01, WinXP
Here is the code fragment:
public class ReportViewer extends BaseFrame implements FontChange_int
private String cReport;
private boolean testMode = false;
// Graphical components
private BorderLayout cMainLayout;
private JButton cClose;
private JTextPane cRptPane;
private Button cClose2;
private ViewUpdater cViewUpdater = null;
// Constants
final static int startupXSize = 650;
final static int startupYSize = 500;
// Methods
public ReportViewer(String report, ReportMain main)
// BaseFrame extends JFrame
super("Reports Viewer", true, startupXSize, startupYSize);
testMode = false;
cReport = report;
cViewUpdater = new ViewUpdater();
initialize();
public void initialize()
// Create main layout manager
cMainLayout = new BorderLayout();
getContentPane().setLayout(cMainLayout);
// Quick button bar - print, export, save as
JToolBar topPanel = new JToolBar();
topPanel.setBorder(new BevelBorder(BevelBorder.RAISED) );
java.net.URL url;
topPanel.add(Box.createHorizontalStrut(10));
url = Scm.class.getResource("images/Exit.gif");
cClose = new Button(new ImageIcon(url), true);
cClose.setToolTipText("Close Window");
topPanel.add(cClose);
getContentPane().add(topPanel, BorderLayout.NORTH);
// Main view window - HTML
cRptPane = new JTextPane();
cRptPane.setContentType("text/html");
cRptPane.setEditable(false);
JScrollPane sp = new JScrollPane(cRptPane);
getContentPane().add(sp, BorderLayout.CENTER);
// Main button - Close
JPanel bottomPanel = new JPanel();
url = Scm.class.getResource("images/Exit.gif");
cClose2 = new Button(new ImageIcon(url), "Close");
bottomPanel.add(cClose2);
getContentPane().add(bottomPanel, BorderLayout.SOUTH);
cClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeWindow();
cClose2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeWindow();
show();
cViewUpdater.setText(cReport);
SwingUtilities.invokeLater(cViewUpdater);
protected void
closeWindow()
super.closeWindow();
// If I add the following lines, the GC reclaims
// part of the memory but does not flush out the text
// component as a whole
/*Document doc = cRptPane.getDocument();
try
doc.remove(0,doc.getLength());
catch(Exception e) {;}
doc=null; */
cRptPane=null;
cReport = null;
cViewUpdater = null;
dispose();
private class ViewUpdater implements Runnable
private String cText = null;
public ViewUpdater() {;}
public void
setText(String text) {
cText = text;
public void
run() {
cRptPane.setText(cText);
cRptPane.setCaretPosition(0);
cText = null;
// Local main - for testing
public static void main(String args[])
//new ReportViewer(str,comp);
Sudarshan
www.spectrumscm.comHi,
I am facing huge memory leak problems with JTextArea/JTextPane. After considerable investigation, I found out that the Document associated with the component is not being GC'ed properly. I ran OptimizeIt and found out that the memory is being consumed by the JTextPane.setText() method. I have implmented a HTML viewer to display large amounts of HTML data and it is leaking memory like crazy on each successive execution. Any thoughts ??
JDK1.4.2_01, WinXP
Here is the code fragment:
public class ReportViewer extends BaseFrame implements FontChange_int
private String cReport;
private boolean testMode = false;
// Graphical components
private BorderLayout cMainLayout;
private JButton cClose;
private JTextPane cRptPane;
private Button cClose2;
private ViewUpdater cViewUpdater = null;
// Constants
final static int startupXSize = 650;
final static int startupYSize = 500;
// Methods
public ReportViewer(String report, ReportMain main)
// BaseFrame extends JFrame
super("Reports Viewer", true, startupXSize, startupYSize);
testMode = false;
cReport = report;
cViewUpdater = new ViewUpdater();
initialize();
public void initialize()
// Create main layout manager
cMainLayout = new BorderLayout();
getContentPane().setLayout(cMainLayout);
// Quick button bar - print, export, save as
JToolBar topPanel = new JToolBar();
topPanel.setBorder(new BevelBorder(BevelBorder.RAISED) );
java.net.URL url;
topPanel.add(Box.createHorizontalStrut(10));
url = Scm.class.getResource("images/Exit.gif");
cClose = new Button(new ImageIcon(url), true);
cClose.setToolTipText("Close Window");
topPanel.add(cClose);
getContentPane().add(topPanel, BorderLayout.NORTH);
// Main view window - HTML
cRptPane = new JTextPane();
cRptPane.setContentType("text/html");
cRptPane.setEditable(false);
JScrollPane sp = new JScrollPane(cRptPane);
getContentPane().add(sp, BorderLayout.CENTER);
// Main button - Close
JPanel bottomPanel = new JPanel();
url = Scm.class.getResource("images/Exit.gif");
cClose2 = new Button(new ImageIcon(url), "Close");
bottomPanel.add(cClose2);
getContentPane().add(bottomPanel, BorderLayout.SOUTH);
cClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeWindow();
cClose2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeWindow();
show();
cViewUpdater.setText(cReport);
SwingUtilities.invokeLater(cViewUpdater);
protected void
closeWindow()
super.closeWindow();
// If I add the following lines, the GC reclaims
// part of the memory but does not flush out the text
// component as a whole
/*Document doc = cRptPane.getDocument();
try
doc.remove(0,doc.getLength());
catch(Exception e) {;}
doc=null; */
cRptPane=null;
cReport = null;
cViewUpdater = null;
dispose();
private class ViewUpdater implements Runnable
private String cText = null;
public ViewUpdater() {;}
public void
setText(String text) {
cText = text;
public void
run() {
cRptPane.setText(cText);
cRptPane.setCaretPosition(0);
cText = null;
// Local main - for testing
public static void main(String args[])
//new ReportViewer(str,comp);
Sudarshan
www.spectrumscm.com -
How Do I Make Text Colored in a JTextPane
I currently have a program that uses a JTextArea to display text that the user has typed into a Text Field. This is working and i now want to be able to make parts of this text different colors. I was looking in the tutorials and it looks like i need to use a JTextPane but i am not sure how to do this, does anyone have any advice? Thanks in advance.
going86 wrote:
The tutorial does not explain hot to do it very well, it is hard to understand.Then give it your best shot, and come back with your code and your specific points of misunderstanding. The onus of effort here must be on you.
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