Making JSpinner act like JSlider

[Sean Casey]

Hi,

In a JSlider there is a method getValueIsAdjusting() which checks to see if the slider knob is still being dragged. I can use this method to update things after the slider is no longer being dragged. Is there some way to get this behavior in a JSpinner. That is I only want to update after the value is not being incremented or decremented any more on the JSpinner. I couldn't find anything in the API that suggests there is an easy workaround, and I don't have the option of getting rid of the JSpinner. Thanks for any help.

[Michael Dunn]

maybe you can roll-your-own

something like this - needs major testing

    
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing
{
  boolean valueIsAdjusting = false;
  public void buildGUI()
  {
    JPanel p = new JPanel();
    final JSpinner spinner = new JSpinner(new SpinnerNumberModel(50, 0, 100, 5));
    spinner.setUI(new MyUI());
    p.add(spinner);
    JFrame f = new JFrame();
    f.getContentPane().add(p);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    spinner.addChangeListener(new javax.swing.event.ChangeListener(){
      public void stateChanged(javax.swing.event.ChangeEvent ce){
        SwingUtilities.invokeLater(new Runnable(){
          public void run(){
            if(getValueIsAdjusting() == false)
            {
              System.out.println(spinner.getValue());
            }
          }
        });
      }
    });
  }
  public boolean getValueIsAdjusting()
  {
    return valueIsAdjusting;
  }
  class MyUI extends javax.swing.plaf.basic.BasicSpinnerUI
  {
    protected Component createNextButton()
    {
      JButton btnUp = (JButton)super.createNextButton();
      btnUp.addMouseListener(new MouseAdapter(){
        public void mousePressed(MouseEvent me){
          valueIsAdjusting = true;
        }
        public void mouseReleased(MouseEvent me){
          valueIsAdjusting = false;
        }
      });
      return btnUp;
    }
    protected Component createPreviousButton()
    {
      JButton btnDown = (JButton)super.createPreviousButton();
      btnDown.addMouseListener(new MouseAdapter(){
        public void mousePressed(MouseEvent me){
          valueIsAdjusting = true;
        }
        public void mouseReleased(MouseEvent me){
          valueIsAdjusting = false;
        }
      });
      return btnDown;
    }
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
      }
    });
  }
}

[Sean Casey]

Hi Michael,

Thanks for your reply. I did something similar, and then I needed to simulate the holding down of the button so I used a timer to find out how long the button was held down for and incremented/decremented the spinner accordingly.