Java Glossary : JSlider

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JSlider

A Swing JComponent that lets the user drag a thumbtab horizontally or vertically to continuously change a numeric value. For example, a JSlider can be used to control magnification continuously. You can redraw as the slider moves. I used it on in one app to control the speed of an animation.

It does not have a built in indicator of the value. It will label the slider with tick marks and calibrations. You have no control over the Font or Color of the calibrations. If you try too big a range on too short a slider, you get gibberish since the calibrations overlap. They work for both negative and positive values.

Here is how you use it:

import javax.swing.JSlider;
...
private JSlider requestSpeed;
...
requestSpeed = new JSlider( JSlider.HORIZONTAL, -50 /* min */, 50 /* max */, 0 /* initial */ );
requestSpeed.setMajorTickSpacing( 10 );
requestSpeed.setMinorTickSpacing( 5 );
requestSpeed.setPaintTicks( true );
requestSpeed.setPaintLabels( false );
requestSpeed.setPaintTrack( true );
requestSpeed.setValue( rampSpeed );

// user changed the speed request slider
ChangeListener requestSpeedListener = new ChangeListener()
   {
   /**
   * Invoked when the target of the listener has changed its state.
   *
   * @param e  a ChangeEvent object
   */
   public void stateChanged( ChangeEvent event )
      {
      int speed = requestSpeed.getValue();
      ...
      }
   };
requestSpeed.addChangeListener( requestSpeedListener );

documentation on JSlider : available:

on the web at java.Sun.com
on J: in the JDK 1.4.2_04: J:\j2sdk1.4.2_04\docs\api\javax\swing\JSlider.html
on J: in the JDK 1.5 beta: J:\Program Files\Java\j2sdk1.5.0\docs\api\javax\swing\JSlider.html

JSpinner ¤ Swing

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