JTextPane - Colour specific words

Hi DrWarezz,
   
I don't know Java much but can tell you the algorithm.
First put an event handler to check the change in text like "Text1_Change" in VB
Search for the word and get the position.
If word is found, change the format.

Bye
--
Harish

.....


// Change the word to red
word = changeColor(word, "#ff0000");


public String changeColor(String s, String color) {
      return <font color=\" + color + \">" + s + "</font>";
}

>>return <font color=\" + color + \">" + s + "</font>";

should of course be

return "<font color=\" + color + \">" + s + "</font>";

We have just answered such a question. Scroll to the bottom of the following question, and you will find a full working example of textpane that changes the font for the words wich are misspeled:

http://experts-exchange.com/Programming/Programming_Languages/Java/Q_21288848.html

There are two classes that you need, I copied them both here:


////////// AgentTextPane  class

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;


public class AgentTextPane extends JTextPane implements KeyListener, MouseListener, MouseMotionListener
{

   /**
    * The stopping point of the last word break
    */
   private int stop = -1;

   /**
    * The style for agent
    */
   private Style agentStyle = getTextStyle("AgentStyle", Color.gray);
   private Style theStyle = getTextStyle("MyStyle", Color.red);

   /**
    * The styled document agent uses
    */
   private StyledDocument agentDoc;

   public AgentTextPane(StyledDocument doc)
   {
      super(doc);
      //Get the document from text pane
      agentDoc = (StyledDocument) getDocument();

      //Sets the logical style for agent to use from the beginning position
      agentDoc.setLogicalStyle(0, agentStyle);
      addKeyListener(this);
      addMouseListener(this);
      addMouseMotionListener(this);

   }

   // ----------------------------------------------------------------------
   // METHODS FOR THE KEYLISTENER INTERFACE
   // ----------------------------------------------------------------------
   public void keyPressed(KeyEvent event)
   {
      try
      {
         if (event.getKeyChar() == '\b' && (getCaretPosition() <= stop + 1))
         {
            String deleted = getDocument().getText(getCaretPosition() - 1, 1);
            getDocument().insertString(getCaretPosition(), deleted, agentStyle);
            //event.consume();  // If working on java 1.5 use this line instead of the above two lines
         }
      }
      catch (Exception e)
      {
         e.printStackTrace();
      }
      checkCaretPosition();
      return;
   }

   public void keyTyped(KeyEvent event)
   {
      if (Character.isWhitespace(event.getKeyChar()))
      {
         if (checkSpelling(event.getKeyChar()))
            event.consume();
      }
      checkCaretPosition();
   }

   public void keyReleased(KeyEvent event)
   {
      checkCaretPosition();
   }

   private void checkCaretPosition()
   {
      if (getCaretPosition() < stop + 1)
      {
         if (stop + 1 > getDocument().getLength())
         {
            setCaretPosition(getDocument().getLength());
         }
         else
         {
            setCaretPosition(stop + 1);
         }
      }
   }

   /**
    * Checks the spelling of the last inserted word.
    */

   private boolean checkSpelling(char charTyped)
   {
      StyledDocument doc = (StyledDocument) getDocument();

      // See if my stop value is out of sync with the document...
      if (stop < 0 || stop >= doc.getLength())
         stop = 0;

      if (stop > 0) stop++;
      // Retrieve the text to check and send it to the spell checker...
      try
      {
         String text = doc.getText(stop, doc.getLength() - stop).trim();
         if (text.length() == 0) return false;
         String replace = checkWord(text.trim());

         Style style = (replace.equals(text)) ? agentStyle: theStyle;
          // Apply correct style...
         doc.insertString(doc.getLength(), new String(new char[]{charTyped}), agentStyle);
         doc.remove(stop, doc.getLength() - stop - 1);
         doc.insertString(stop, replace, style);
         stop = doc.getLength() - 1;
         return true;
      }
      catch (Exception ignored)
      {
      }
      return false;
   }

   // Set the style for the styled document in a JTextArea
   private Style getTextStyle(String styleName, Color foregroundColor)
   {
      StyledDocument styleDoc = (StyledDocument) getDocument();
      Style style;

      // Set the style attributes for the doc
      style = styleDoc.addStyle(styleName, null);
      // Bold
      StyleConstants.setBold(style, true);
      // Font family
      StyleConstants.setFontFamily(style, "SansSerif");
      // Font size
      StyleConstants.setFontSize(style, 30);
      // Foreground color
      StyleConstants.setForeground(style, foregroundColor);
      return style;
   }

   // Fake one for simulation
   public String checkWord(String word)
   {
      String replacedWord;
      String wrongStr1 = "teh";
      String wrongStr2 = "experter";
      String wrongStr3 = "exp";

      if (word.equals(wrongStr1))
      {
         replacedWord = "the";
      }
      else
      {
         if (word.equals(wrongStr2))
            replacedWord = "EXPERT";
         else
         {
            if (word.equals(wrongStr3))
               replacedWord = "EXPERT";
            else
               replacedWord = word;
         }
      }
      return replacedWord;
   }

  public void mouseClicked(MouseEvent e)
  {

  }

  public void mousePressed(MouseEvent e)
  {
     if (getCaretPosition() <= stop + 1)
      setCaretPosition(getDocument().getLength());
  }

  public void mouseReleased(MouseEvent e)
  {
     if (getCaretPosition() <= stop + 1)
      setCaretPosition(getDocument().getLength());
  }

  public void mouseEntered(MouseEvent e)
  {

  }

  public void mouseExited(MouseEvent e)
  {

  }

  public void mouseDragged(MouseEvent e)
  {
     if (getCaretPosition() <= stop)
      setCaretPosition(getDocument().getLength());
  }

  public void mouseMoved(MouseEvent e)
  {

  }
}



/////////////////////////// TextPaneDisplay

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class TextPaneDisplay extends JFrame {

     StyledDocument doc = new DefaultStyledDocument();


    AgentTextPane agentArea = new AgentTextPane(doc);

    public TextPaneDisplay() {

        JScrollPane scrollingArea = new JScrollPane(agentArea);
        scrollingArea.setBorder(BorderFactory.createEmptyBorder(10,5,10,5));

        // Get the content pane, set layout, add to center
        Container content = this.getContentPane();
        content.setLayout(new BorderLayout());
        content.add(scrollingArea, BorderLayout.CENTER);
        this.pack();
    }

    public static void main(String[] args) {
        JFrame win = new TextPaneDisplay();
        win.setTitle("AgentTextPane");
        win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        win.setSize( 500, 400 );
        win.setVisible(true);
    }
}

Thanks very much..

Is there a way to stop the caret from forcing itself to the end of the text area?? Because you can use backspace, nor go through the code, and make other alterations..

?

Thanks,
[r.D]

>"Because you can use backspace"
should be:

Because you can NOT use backspace...

DrWarrez,

Thx for the qucik accept! I belive those were my fastest earned points :)