Why JSlider event listener no response?
Thanks,
hi, the JSlider does exist, but when it slides, data is unchanged.
Please help.
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.util.Hashtable;
import java.awt.event.*;
import javax.swing.event.*;
// import AppletAndApplicationExample.AppQuitter;
publicclass Comboxextends JApplet
{
...
private LayoutManager Layout;
private Container Panel;
private Drawing drawing;
..private String energyId[];
...
privateint numberofCells;
privateint numberofsets;
privateint id;//PlotEnergyId
privatedouble lineWidth;
privateint min = 1, max = 16, inc = 5;
double scale = 1.0;
private String currentPattern;
private JSlider dJSlider;
publicvoid init(){
Layout =new BorderLayout ();
getDrawingData();
dJSlider =new JSlider(min, max, 6);
drawing =new Drawing();
Panel = getContentPane();
Panel.setLayout (Layout);
Panel.add (drawing,"Center");
JPanel sliderPanel =new JPanel();
sliderPanel.setLayout(new BoxLayout(sliderPanel,
BoxLayout.PAGE_AXIS));
dJSlider.setAlignmentX(Component.LEFT_ALIGNMENT);
sliderPanel.add(dJSlider);
dJSlider.setMajorTickSpacing(5);
dJSlider.setMinorTickSpacing(1);
dJSlider.setSnapToTicks(true);
dJSlider.setLabelTable(getLabelTable(min, max, inc));
dJSlider.setPaintTicks(true);
dJSlider.setPaintLabels(true);
dJSlider.addChangeListener(
new ChangeListener()// anonymous inner class
// handle change in slider value
{
publicvoid stateChanged(ChangeEvent e)
{
int value = ((JSlider)e.getSource()).getValue();
scale = (value+4)/10.0;
}
}
);
Panel.add(sliderPanel,BorderLayout.NORTH);// ADD Slider
scaleData();// use JSlider to obtain new data
System.out.println(scale);// [b]found unchaged data,scale =1,why?[/b]
}
private Hashtable getLabelTable(int min,int max,int inc){
Hashtable<Integer, JLabel> table =new Hashtable<Integer, JLabel>();
for(int j = min; j <= max; j+=inc){
String s = String.format("%.1f", (j+4)/10.0);
table.put(Integer.valueOf(j),new JLabel(s));
}
return table;
}
publicvoid getDrawingData()
{...
}
publicvoid scaleData()
{
for(int i = 0; i < numberofCells; i++)
{
for(int j = 0; j<cellsPointsNumber[i]; j++)
{
xCells[i][j] = (xCells[i][j])*scale+TRANSITION;
yCells[i][j] = (yCells[i][j])*scale+TRANSITION;
}
}
}
publicstaticvoid main(String[] args){
/* Set up the frame that holds the applet. */
JFrame appletFrame =new JFrame("My Applet");
Applet theApplet =new Combox();
appletFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
appletFrame.setSize(800,800);
appletFrame.add(theApplet,"Center");// applet fills
// frame
/* Now start invoking applet methods. */
theApplet.init();
// applet
appletFrame.show();// bring frame and initialized
// applet on screen
theApplet.start();
theApplet.stop();
theApplet.destroy();
}
}// end class
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