import java.awt.Color;
  import java.awt.Component;

  import java.awt.Dimension;
  import java.awt.Font;

  import java.util.ArrayList;
  
  import javax.swing.Box;
  import javax.swing.BoxLayout;
  import javax.swing.JLabel;
  import javax.swing.JList;
  import javax.swing.JPanel;
  import javax.swing.ListCellRenderer;
  
  public class MusicRenderer extends JPanel implements ListCellRenderer<Music> {
  	private static final long serialVersionUID = 1L;
  	private static final Color DEFAULT_BACKGROUND = new JPanel().getBackground();

  	private static final Font defaultFont = new Font(new JLabel().getFont().getName(), Font.PLAIN, new JLabel().getFont().getSize());

  	
  	private TimeLineJPanel timeLine;

  	private int infoPadding = 0;

  	
  	public ArrayList<PatternJPanel> patterns;
  	
  	public MusicRenderer(TimeLineJPanel timeLine) {
  		this.timeLine = timeLine;
  		this.patterns = new ArrayList<>();
  	}
  	

  	public void setInfoPadding(int infoPadding) { this.infoPadding = infoPadding; }
  	

  	@Override
  	public Component getListCellRendererComponent(JList<? extends Music> list, Music music, int index,
  			boolean isSelected, boolean cellHasFocus) {
  		removeAll();

  		if(music == null)
  			return this;

  		
  		setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
  		
  		JPanel infoPanel = new JPanel();
  		infoPanel.setLayout(new BoxLayout(infoPanel, BoxLayout.LINE_AXIS));

  		infoPanel.add(Box.createRigidArea(new Dimension(infoPadding, 0)));
  		JLabel infoLabel = new JLabel("Pattern " + String.valueOf(index) + " : "
  				+ "(vol : " + String.valueOf(music.getVolume()) + ", "
  				+ "effect : " + MusicPath.pathNames[music.getMusicPath().getAnimation()] + ", "
  				+ "effect duration : " + Util.tickToText(music.getMusicPath().getEffectDuration()) + ")");
  		infoLabel.setFont(defaultFont);
  		infoPanel.add(infoLabel);

  		infoPanel.add(Box.createHorizontalGlue());

  		
  		if(isSelected) {
  			infoPanel.setBackground(Color.LIGHT_GRAY);
  		} else {
  			infoPanel.setBackground(DEFAULT_BACKGROUND);
  		}
  		

  		add(infoPanel);
  		
  		PatternJPanel pattern = new PatternJPanel(music, timeLine);
  		if(patterns.size() > index)
  			patterns.set(index, pattern);
  		else
  			patterns.add(pattern);
  		add(pattern);
  		
  		return this;
  	}
  }