Name: sgC58550 Date: 05/15/97


I found a bug with TextComponentPeer under WinNT which causes
newline characters to count as two characters instead of one.
This prevents you from setting the caret position to the end of a string
containing a newline character. This also causes getCaretPosition() to
return values greater than the length of the string contained in the
component if set by mouse click at the end of the text.

import java.awt.Frame;
import java.awt.TextArea;
import java.awt.TextComponent;

public class Foo {

  public Foo() {
  }

  public static void main(String agrs[]) {
    Frame fm = new Frame("TextArea bug");
    TextArea ta = new TextArea(10, 20);
    fm.setSize(200, 200);
    fm.add(ta);
    fm.show();
    ta.setText("One\nTwo\nThree\n");
    ta.setCaretPosition(ta.getText().length());
    try {Thread.sleep(100000);} catch (Exception e) {};
  }
}


company - Oracle Corp
======================================================================

The included code demonstrates the problem.
The setCaretPosition() call is intended to
put the caret at the end of the last
line. The offset from end of line appears to
be the number of \n characters in the text.

--------------------------------------------------

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;

public class setCaretBug extends Frame {

// These variables are used in more than one method or must persist
// across multiple calls to a method.
    TextArea logDisplay; //The display of the log
    int logDisplayCaretPosition;

    public setCaretBug() { //Class constructor (only one)

    // Create text display and IO
Font f = new Font("Courier",Font.PLAIN,14);
logDisplay = new TextArea(
"\n\nThe log is empty and CANNOT be editted.\n\n" +
"Use File/New Log to create a new log.\n\n" +
"Use File/Recover Log to recover after a crash."
,30,80,TextArea.SCROLLBARS_VERTICAL_ONLY);
    // Put the insertion caret at end of text
logDisplayCaretPosition = logDisplay.getText().length();
logDisplay.setEditable(false); //Until ready for input
logDisplay.setFont(f);

    // Create and fill panels
Panel p1 = new Panel();
Panel p2 = new Panel();
Panel p3 = new Panel();

p1.setLayout(new FlowLayout(FlowLayout.CENTER));
p2.setLayout(new FlowLayout(FlowLayout.CENTER));
p3.setLayout(new FlowLayout(FlowLayout.CENTER));

    // Add items to their own panels
p1.add(logDisplay);

    // Add the panels
add("North",p1);
add("Center",p2);
add("South",p3);

addWindowListener (new KILLmainWindow());

    } //end of CCRlog constructor
 
    public void start() {
setSize(700, 650);
setVisible(true);

logDisplay.requestFocus();
logDisplay.setCaretPosition(logDisplayCaretPosition);
    } //end of start method

    private void quitSave() {
System.out.println("Exiting...");
setVisible(false);
dispose();
System.exit(0);
    }

    public static void main(String args[]) {
setCaretBug m = new setCaretBug();
m.start();

    } //end of main method

    class KILLmainWindow extends WindowAdapter {
public void windowClosing(WindowEvent event) {
quitSave();
}
    }
}
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