JSpinner: Increase length of editor box

Question

I have a JSpinner that displays decimal values from 0.0 to 999.0. It seems to work fine, except for when it displays a number in the editor box that is four-digits long, su

Answer 1

You can get to the text field which in fact is a JFormattedTextField by

• First calling getEditor() on your JSpinner to get the spinner's editor
• cast the returned object to JSpinner.DefaultEditor
• Then call getTextField() on this. Then you can set it's preferredSize if desired.

Edit: as noted by trashgod though, using a proper layout is paramount and being sure that the layouts you use are the best is probably the best way to solve this issue.

Edit 2: The above is wrong as setting the textfield's preferred size does nothing. You can however set the preferred size of the editor itself, and that works. e.g .,

import java.awt.Dimension;

import javax.swing.*;

public class SpinnerBigTextField {
   private static void createAndShowGui() {
      JSpinner spinner = new JSpinner(new SpinnerNumberModel(0.0, 0.0, 999.0,
            0.5));

      JPanel panel = new JPanel();
      panel.setPreferredSize(new Dimension(300, 100));
      panel.add(spinner);

      JComponent field = ((JSpinner.DefaultEditor) spinner.getEditor());
      Dimension prefSize = field.getPreferredSize();
      prefSize = new Dimension(200, prefSize.height);
      field.setPreferredSize(prefSize);

      JFrame frame = new JFrame("SpinnerBigTextField");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(panel);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

Answer 2

The first Hovercraft answers is not bad at all. You can not change the size directly, but you can do something like this:

JComponent editor = mySpinner.getEditor();
JFormattedTextField tf = ((JSpinner.DefaultEditor) editor).getTextField();
tf.setColumns(4);

Where you can define the columns numbers showed by the editor. It will change the size of the spinner.

Answer 3

As FontMetrics vary from one platform to the next, it's better to rely on the component's own calculation of preferred size. This example shows a spectrum of JSpinner sizes for various min and max values. Note in particular that FlowLayout "lets each component assume its natural (preferred) size."

import java.awt.EventQueue;
import java.awt.FlowLayout;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;

/** @see http://stackoverflow.com/questions/7374659 */
public class SpinnerTest extends Box {

    private static final double STEP = 0.1d;
    private static final String FORMAT = "0.0000000000";

    public SpinnerTest(int axis) {
        super(axis);
        for (int i = 0; i < 8; i++) {
            int v = (int) Math.pow(10, i);
            this.add(genParamPanel((i + 1) + ":", -v, v));
        }
    }

    private JPanel genParamPanel(String name, double min, double max) {
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        JLabel label = new JLabel(name, JLabel.TRAILING);
        JSpinner js = new JSpinner(new SpinnerNumberModel(min, min, max, STEP));
        js.setEditor(new JSpinner.NumberEditor(js, FORMAT));
        panel.add(label);
        panel.add(js);
        return panel;
    }

    private void display() {
        JFrame f = new JFrame("SpinnerTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new SpinnerTest(BoxLayout.Y_AXIS).display();
            }
        });
    }
}

Answer 4

Changing the max value of a spinner will increase the size of the text box to accommodate the large number. If you do not wish to make the max value larger, i would recommend what @JorgeHortelano suggested...

JComponent editor = mySpinner.getEditor(); JFormattedTextField tf = ((JSpinner.DefaultEditor) editor).getTextField(); tf.setColumns(4);

Answer 5

JSpinner spn=new JSpinner();
spn.setPreferredSize(new Dimension(100,25));

Here,look This is the easy Answer.