I want to place the cursor to user given line number.For this I had write code.But,when I enter a line number 2 the cursor was placed in after first character not in start of the second line.Please help me...Thank you. Here is code:
public class GoToAction extends javax.swing.JFrame {
int i=0;
JTextPane textPane;
int lineCount;
public GoToAction() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tabbedPane = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
file = new javax.swing.JMenu();
create = new javax.swing.JMenuItem();
goTo = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
file.setText("File");
create.setText("Create");
create.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
createActionPerformed(evt);
}
});
file.add(create);
goTo.setText("GoTo");
goTo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
goToActionPerformed(evt);
}
});
file.add(goTo);
jMenuBar1.add(file);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void createActionPerformed(java.awt.event.ActionEvent evt) {
final JInternalFrame internalFrame = new JInternalFrame("");
i++;
internalFrame.setName("Document"+i);
internalFrame.setClosable(true);
internalFrame.setAutoscrolls(true);
textPane=new JTextPane();
textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
internalFrame.add(textPane);
tabbedPane.add(internalFrame);
internalFrame.setSize(internalFrame.getMaximumSize());
internalFrame.pack();
internalFrame.setVisible(true);
}
private void goToActionPerformed(java.awt.event.ActionEvent evt) {
do {
try {
String str = (String)JOptionPane.showInputDialog(this,"Line number:\t","Goto line",JOptionPane.PLAIN_MESSAGE,null,null,null);
if( str == null ) {
break;
}
int lineNumber = Integer.parseInt(str);
lineCount=getLineCount();
if ( lineNumber > lineCount ) {
JOptionPane.showMessageDialog(this,"Line number out of range","EPAD Goto line",JOptionPane.ERROR_MESSAGE);
continue;
}
for ( int i = 0 ; i < lineCount; i++ ){
if ( i+1 == lineNumber ) {
textPane.setCaretPosition(i);
return;
}
}
} catch ( Exception e ) {
}
} while ( true );
}
public int getLineCount(){
lineCount=0;
Scanner sc=new Scanner(textPane.getText());
while(sc.hasNextLine()){
String line = sc.nextLine();
lineCount++;
}
return lineCount;
}
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(GoToAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(GoToAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(GoToAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(GoToAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new GoToAction().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuItem create;
private javax.swing.JMenu file;
private javax.swing.JMenuItem goTo;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JTabbedPane tabbedPane;
// End of variables declaration
}
Check out the gotoStartOfLine(...) method in Text Utilities for a more efficient solution that takes advantage of the Element structure of the Document used by the text component.