Re: How to lock 3 JSliders together

From:

"Michael Dunn" <m_odunn@yahoo.com>

Newsgroups:

comp.lang.java.gui

Date:

Sat, 17 Jun 2006 06:04:32 +1000

Message-ID:

<44930ed3$1@dnews.tpgi.com.au>

"TonyZ" <tonyz@link-research.com> wrote in message
news:1150386559.321223.195020@i40g2000cwc.googlegroups.com...

Hi all,
I have 3 JSliders and I want the option of locking their movement
together. I use
a checkbox labeled "Lock Sliders" to determine whether the sliders
should be locked or not.

I thought I could do this by using the "setValue()" method on the two
sliders that were not
being draged. For example, if the user was dragging slider A, I would
set the value of B and C in the Change Listener routine.

The problem is that the setValue() fires a changed state for the B and
C sliders (each of
which, in turn, fires a changed state for the other two, causing a big
problem).

Anybody ever tried locking sliders? How can it be done?

maybe (?) something like this

import java.awt.*;
import javax.swing.*;
class Testing extends JFrame
{
  JSlider[] sliders = new JSlider[3];
  BoundedRangeModel[] models = new BoundedRangeModel[sliders.length];
  JPanel colorPanel = new JPanel();
  SliderListener listener = new SliderListener();
  public Testing()
  {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLocation(200,100);
    colorPanel.setPreferredSize(new Dimension(400,200));
    colorPanel.setBackground(new Color(0,0,0));
    JPanel panel = new JPanel(new GridLayout(3,1));
    for(int x =0; x < sliders.length; x++)
    {
      sliders[x] = new JSlider(0,255,0);
      sliders[x].setMajorTickSpacing(20);
      sliders[x].setMinorTickSpacing(10);
      sliders[x].setPaintTicks(true);
      sliders[x].setPaintLabels(true);
      sliders[x].addChangeListener(listener);
      models[x] = sliders[x].getModel();
      panel.add(sliders[x]);
    }
    JPanel p = new JPanel();
    final JCheckBox cbx = new JCheckBox("Lock");
    p.add(cbx);
    getContentPane().add(panel,BorderLayout.NORTH);
    getContentPane().add(colorPanel,BorderLayout.CENTER);
    getContentPane().add(p,BorderLayout.SOUTH);
    pack();
    cbx.addActionListener(new java.awt.event.ActionListener(){
      public void actionPerformed(java.awt.event.ActionEvent ae){
        if(cbx.isSelected())
        {
          sliders[1].setModel(sliders[0].getModel());
          sliders[2].setModel(sliders[0].getModel());
          colorPanel.setBackground(new
Color(sliders[0].getValue(),sliders[1].getValue(),sliders[2].getValue()));
        }
        else
        {
          sliders[1].setModel(models[1]);
          sliders[2].setModel(models[2]);
          colorPanel.setBackground(new
Color(sliders[0].getValue(),sliders[1].getValue(),sliders[2].getValue()));
        }}});
  }
  class SliderListener implements javax.swing.event.ChangeListener
  {
    public void stateChanged(javax.swing.event.ChangeEvent ce)
    {
      colorPanel.setBackground(new
Color(sliders[0].getValue(),sliders[1].getValue(),sliders[2].getValue()));
    }
  }
  public static void main(String[] args){new Testing().setVisible(true);}
}