/* DashListCellRenderer.java created 2007-11-13
 *
 */

package org.signalml.app.view.tag;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;

import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;


/**
 * Cell renderer for the cells which has values of the type {@link Dash}.
 * The dashing pattern {@link Dash#dash obtained} from this values is used
 * to draw the horizontal line in the cell.
 *
 * @author Michal Dobaczewski © 2007-2008 CC Otwarte Systemy Komputerowe Sp. z o.o.
 */
public class DashListCellRenderer extends JComponent implements ListCellRenderer {

	private static final long serialVersionUID = 1L;

	/**
	 * the border that is used when the cell is not focused
	 */
	private static final Border NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
	/**
	 * the preferred size of this component
	 */
	private static final Dimension PREFERRED_SIZE = new Dimension(100,18);

	/**
	 * the dashing pattern
	 */
	private float[] dash;

	/**
	 * Returns this component to be used for drawing the cell.
	 * This component has:
	 * <ul>
	 * <li>different borders for cell:<ul>
	 * <li>focused and selected,</li>
	 * <li>focused but not selected,</li>
	 * <li>not focused,</li></ul></li>
	 * <li>different background and foreground color for cell:<ul>
	 * <li>focused,</li><li>unfocused.</li></ul></li></ul>
	 * From the {@code value} of the cell dashing pattern is extracted, stored
	 * and later it is used for drawing this component.
	 */
	@Override
	public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {

		if (isSelected) {
			setBackground(list.getSelectionBackground());
			setForeground(list.getSelectionForeground());
		} else {
			setBackground(list.getBackground());
			setForeground(list.getForeground());
		}

		setEnabled(list.isEnabled());
		setFont(list.getFont());

		Border border = null;
		if (cellHasFocus) {
			if (isSelected) {
				border = UIManager.getBorder("List.focusSelectedCellHighlightBorder");
			}
			if (border == null) {
				border = UIManager.getBorder("List.focusCellHighlightBorder");
			}
		} else {
			border = NO_FOCUS_BORDER;
		}

		setBorder(border);

		TagStylePropertiesPanel.Dash dashObj = (TagStylePropertiesPanel.Dash) value;
		dash = (dashObj != null ? dashObj.dash : null);

		return this;

	}

	/**
	 * Paints this component.
	 * This component contains one blue horizontal line which is drawn using
	 * the stroke created with the stored {@link #dash dashing pattern}.
	 * @see JComponent#paintComponent(Graphics)
	 */
	@Override
	protected void paintComponent(Graphics gOrig) {
		super.paintComponent(gOrig);

		Graphics2D g = (Graphics2D) gOrig;

		g.setColor(Color.BLUE);
		g.setStroke(new BasicStroke(3, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10F, dash, 0));

		Insets insets = getInsets();
		Dimension size = getSize();
		int level = (size.height - (insets.top+insets.bottom)) / 2;

		g.drawLine(insets.left + 3, level, size.width - (insets.left+insets.right+7), level);

	}

	@Override
	public Dimension getPreferredSize() {
		return PREFERRED_SIZE;
	}

}