Custom JSpinner Model / Editor
Hello,
This question may have been answered in the past but I could not find anything. I am trying to use a JSpinner for cycling through pages of information. I would like the display to show current page of total number of pages, i.e. 1 of 10. I would also like the user to be able to enter a number and have the spinner display that number in the same format. I am not quite sure if I need to create a custom model and editor or expand the SpinnerNumberModel. Any guidance is much appreciated.
this might be one way for the '1 of 10', for entering a number, just add a keyListener,
and modify the methods accordingly
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing
{
JSpinner spinner;
JTextField tf;
final int TOTAL_PAGES = 10;
int currentPage;
public void buildGUI()
{
tf = new JTextField(10);
tf.setHorizontalAlignment(JTextField.RIGHT);
tf.setEditable(false);
tf.setBackground(Color.WHITE);
spinner = new JSpinner();
spinner.setUI(new MyUI());
spinner.setEditor(tf);
changeValue(1);
JFrame f = new JFrame();
f.getContentPane().add(spinner);
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public void changeValue(int amount)
{
try
{
int newPageNumber = currentPage+amount;
if(newPageNumber < 1 || newPageNumber > TOTAL_PAGES)
{
java.awt.Toolkit.getDefaultToolkit().beep();
return;
}
tf.setText(newPageNumber+" of "+TOTAL_PAGES);
currentPage = newPageNumber;
}
catch(Exception e){e.printStackTrace();}
}
class MyUI extends javax.swing.plaf.basic.BasicSpinnerUI
{
protected Component createNextButton()
{
JButton btnNext = (JButton)super.createNextButton();
btnNext.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
changeValue(1);}});
return btnNext;
}
protected Component createPreviousButton()
{
JButton btnPrevious = (JButton)super.createPreviousButton();
btnPrevious.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
changeValue(-1);}});
return btnPrevious;
}
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable(){
public void run(){
new Testing().buildGUI();
}
});
}
}
