package bjc.utils.gui;

import java.awt.Component;
import java.util.function.Function;

import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;

/**
 * Simple implementation of {@link ListCellRenderer} that uses a custom label.
 * 
 * This renderer does the simple task of using a custom 'toString' method to display text for a given data type.
 * 
 * @param <E> The data-type being displayed
 */
public class DelegateListCellRenderer<E> extends JLabel implements ListCellRenderer<E> {
	private static final long serialVersionUID = -3312631037740011026L;

	private Function<E, String> toStringer;

	/**
	 * Create a new renderer using a given toString function
	 * 
	 * @param toStringer The toString function to use
	 */
	public DelegateListCellRenderer(Function<E, String> toStringer) {
		super();
		this.toStringer = toStringer;
	}


	@Override
	public Component getListCellRendererComponent(JList<? extends E> list, E value, int index, boolean isSelected,
			boolean cellHasFocus) {
		String val = toStringer.apply(value);
		
		setText(val);
		
		if (isSelected) {
			setBackground(list.getSelectionBackground());
			setForeground(list.getSelectionForeground());
		} else {
			setBackground(list.getBackground());
			setForeground(list.getForeground());
		}
		
		setEnabled(list.isEnabled());
		setFont(list.getFont());
		setOpaque(true);
		return this;
	}

}