import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


@SuppressWarnings("serial")
public class RenderTest extends JPanel{
    private JFrame window;
    private FlowLayout topLevelLayout;
    private Slot[] slots;

    public static void main(String[] args) {
        RenderTest instance = new RenderTest();
        instance.init();
    }

    private void init(){
        window = new JFrame("Render Test");

        topLevelLayout = new FlowLayout();
        window.setLayout(topLevelLayout);
        window.setResizable(true);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setLocationRelativeTo(null);

        slots = new Slot[]{new Slot(0), new Slot(2)};

        window.add(slots[0]);
        window.add(slots[1]);

        window.pack();
        window.setVisible(true);
    }

    private class Slot extends JPanel{
        CardLayout cardLayout;
        AddButton add;
        RemoveButton remove;
        public Slot(int index){
            this.add = new AddButton(index);
            this.remove = new RemoveButton(index);
            this.cardLayout = new CardLayout();
            this.setLayout(cardLayout);
            this.cardLayout.addLayoutComponent(add, "add");
            this.cardLayout.addLayoutComponent(remove, "show");
            topLevelLayout.addLayoutComponent("card"+index, this);
        }
        private CardLayout getCardLayout(){
            return this.cardLayout;
        }
    }

    private class AddButton extends JPanel{
        private AddButton(int index){
            JButton addButton = new JButton("+");

            addButton.setVerticalTextPosition(AbstractButton.CENTER);
            addButton.setHorizontalTextPosition(AbstractButton.CENTER);
            addButton.setActionCommand("add"+index);
            addButton.addActionListener(new Button());

            this.add(addButton);
        }
    }

    private class RemoveButton extends JPanel{
        private RemoveButton(int index){
            JButton removeButton = new JButton("-");

            removeButton.setVerticalTextPosition(AbstractButton.CENTER);
            removeButton.setHorizontalTextPosition(AbstractButton.CENTER);
            removeButton.setActionCommand("remove"+index);
            removeButton.addActionListener(new Button());

            this.add(removeButton);
        }
    }

    class Button implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            System.out.println(e.getActionCommand());

            if (e.getActionCommand().equals("add0")){
                slots[0].getCardLayout().show(getParent(), "show");
            }
            if (e.getActionCommand().equals("add1")){
                slots[1].getCardLayout().show(getParent(), "show");

            }
            if (e.getActionCommand().equals("remove0")){
                slots[0].getCardLayout().show(getParent(), "hide");

            }
            if (e.getActionCommand().equals("remove1")){
                slots[1].getCardLayout().show(getParent(), "hide");

            }
        }
    }
}