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ButtonManager
> ButtonPanel > in depth
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ButtonPanel
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package buttonmanager;
import java.awt.Color;
import java.awt.Component;
import java.awt.Point;
import java.util.*;
import javax.swing.JButton;
import javax.swing.JPanel;
class ButtonPanel extends JPanel{
LinkedList buttonList;
int nextButtonLabel=1;
final int BUTTONWIDTH=60;
final int BUTTONHEIGHT=20;
Random rg=new Random();
public ButtonPanel() {
this.setLayout(null);
this.setBackground(Color.GREEN);
buttonList=new LinkedList();
}
private Point generateRandomPoint(){
int x=rg.nextInt(this.getWidth()-BUTTONWIDTH);
int y=rg.nextInt(this.getHeight()-BUTTONHEIGHT);
return new Point(x,y);
}
public void addButton(){
JButton b=new JButton(" "+(nextButtonLabel++)+" ");
b.setLocation(generateRandomPoint());
b.setSize(BUTTONWIDTH,BUTTONHEIGHT);
this.add(b);
this.repaint();
buttonList.add(b);
}
private Component selectElement(){
int numElem=buttonList.size();
if (numElem>0) {
Component o=(Component)buttonList.get(rg.nextInt(numElem));
return o;
} else return null;
}
public void removeButton(){
Component c=selectElement();
if (c!=null) {
buttonList.remove(c);
this.remove((Component)c);
this.repaint();
}
}
void moveButton() {
Component c=selectElement();
if (c!=null) {
Point p=generateRandomPoint();
c.setLocation(p);
this.repaint();
}
}
}
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