Selection within a TextArea

[D4VEHUG]

Can anyone tell me how to select a specific line within a textArea please?

ie.
If a textArea contained 3 lines as below:

cat
dog
fish

I want to be able to select the whole line dog, but based on the cursor being positioned by a mouse click somewhere on that line.

I know I can select all the text by dragging across it but that's too messy.

Any guidance will be more than welcome.

Thank you

 

[prosper]

//my program response to left mouse button click, drag with left mouse button will not show the effect you want
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class myFrame extends JFrame
{
final int JT_COL = 50;
final int JT_ROW = 40;
Highlighter hilite;
int myCount;
JTextArea JT;

public myFrame()
{
getContentPane().setLayout(new BorderLayout());
JT = new JTextArea("oneone\ntwoone\nthree",JT_ROW,JT_COL);

MouseListener myMouse = new MouseListener()
{
public void mouseClicked(MouseEvent e)
{
mySelect(JT.getCaretPosition(),JT);
}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e)
{}

};

JT.addMouseListener(myMouse);
JScrollPane scroller = new JScrollPane();
scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
JViewport vp = scroller.getViewport();
vp.add(JT);
getContentPane().add(scroller, BorderLayout.CENTER);

}
public void mySelect(int pos,JTextArea tempJT)
{
int possibleCaretPos[][] = new int[JT_ROW][2];
int found=0;
StringBuffer sb = new StringBuffer(tempJT.getText());
int totalLen = (tempJT.getText()).length();

Color myColor;
myColor = new Color(204,204,255);

hilite = JT.getHighlighter();
hilite.removeAllHighlights();
int row=0;

if (totalLen>0)
{
possibleCaretPos[0][0]=0;
for (int i=0; i<totalLen; i++)
if (sb.charAt(i)=='\n')
{
possibleCaretPos[row][1]=i;
row++;
possibleCaretPos[row][0]=i+1;
}
possibleCaretPos[row][1]=totalLen;

for (int m=row; m>=0; m--)
{

if (pos>=possibleCaretPos[m][0])
{
found = m;
break;
}

}

}


try
{
myCount++;
//System.out.println(pos+"addhigh"+myCount+" s"+startPos+" e"+endPos);
hilite.addHighlight(possibleCaretPos[found][0], possibleCaretPos[found][1], new DefaultHighlighter.DefaultHighlightPainter (myColor));
}
catch (BadLocationException e) {}




}

public static void main(String args[]) {
myFrame myframeObj = new myFrame();
myframeObj.setSize(800, 300);
myframeObj.setVisible(true);
myframeObj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class MyHighlightPainter extends DefaultHighlighter.DefaultHighlightPainter {
public MyHighlightPainter(Color color) {
super(color);
}
}