JavaSwing图形界面编程之JScrollBar（一）

package three.day.frame;

import java.awt.Color;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollBar;




public class JScrollBarDemo extends JFrame implements AdjustmentListener
{
private JScrollBar redScrollBar;
private JScrollBar blueScrollBar;
private JScrollBar greenScrollBar;

private JLabel lbScale;
private JLabel lbRedScale;
private JLabel lbBlueScale;
private JLabel lbGreenScale;
private JLabel lbColorPallet;

public static void main(String[] args) {
new JScrollBarDemo("JScrollBar Demo");
}




public JScrollBarDemo(String title) throws HeadlessException {
super(title);
redScrollBar = new JScrollBar(JScrollBar.HORIZONTAL,0,10,0,265);
redScrollBar.setUnitIncrement(5);
redScrollBar.setBlockIncrement(10);
redScrollBar.addAdjustmentListener(this);

blueScrollBar = new JScrollBar(JScrollBar.HORIZONTAL,0,10,0,265);
blueScrollBar.setUnitIncrement(5);
blueScrollBar.setBlockIncrement(10);
blueScrollBar.addAdjustmentListener(this);

greenScrollBar = new JScrollBar(JScrollBar.HORIZONTAL,0,10,0,265);
greenScrollBar.setUnitIncrement(5);
greenScrollBar.setBlockIncrement(10);
greenScrollBar.addAdjustmentListener(this);

lbScale = new JLabel("刻度：red:0 blue:0 green:0");
lbRedScale = new JLabel("红色");
lbBlueScale = new JLabel("蓝色");
lbGreenScale = new JLabel("绿色");
lbColorPallet = new JLabel("调色板");
lbColorPallet.setBackground(new Color(0,0,0));
lbColorPallet.setBorder(BorderFactory.createEmptyBorder());
lbColorPallet.setOpaque(true);

Container panel = getContentPane();
panel.setLayout(new GridLayout(8,1));
panel.add(lbScale);
panel.add(lbColorPallet);
panel.add(lbRedScale);
panel.add(redScrollBar);
panel.add(lbBlueScale);
panel.add(blueScrollBar);
panel.add(lbGreenScale);
panel.add(greenScrollBar);
setLocation(300,200);
setSize(400,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
//pack();
setVisible(true);

}


@Override
public void adjustmentValueChanged(AdjustmentEvent e) {
int redValue = 0,greenValue = 0,blueValue = 0;
// TODO Auto-generated method stub
if(e.getSource()==redScrollBar)
{
redValue = e.getValue();
}
if(e.getSource()==blueScrollBar)
{
blueValue = e.getValue();
}
if(e.getSource()==greenScrollBar)
{
greenValue = e.getValue();
}
lbScale.setText("刻度："+"red:"+redValue+"blue:"+blueValue+"green:"+greenValue);
lbColorPallet.setBackground(new Color(redValue,blueValue,greenValue));
}


}