Farben in JList

[bjmicha]

Hallo,

ich würde geren wenn man doppelt auf einen Eintrag in einer JList klickt diesen anders einfärben als die anderen Einträge.
Wie geht dies? DefaultCellRenderer

Gruß

Michael

 

[Thomas Darimont]

Hallo!

Hat zwar noch einen macken aber den kannst du ja ausmerzen ...:

import java.awt.Color;
import java.awt.Component;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

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

/*
 * Created on 03.03.2004
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */

/**
 * @author Darimont
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class JListTest extends JFrame {

	static int[] clickCnt = new int[5];
	private long lastClickTime;
	private int lastIndex;

	public JListTest() {
		super("JListTest");
		setSize(320, 240);
		
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent event) {
				setVisible(false);
				dispose();
				System.exit(0);
			}
		});

		final JList list = new JList();
		list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
		list.setListData(new String[] { "elem1", "elem2", "elem4", "elem5" });
		list.setCellRenderer(new MyListCellRenderer());
		list.addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent evt) {
				int idx = list.getSelectedIndex();
				if (lastIndex == idx) {
					if (System.currentTimeMillis() - lastClickTime < 250) {
						clickCnt[idx] = 2;
						System.out.println("Double clicked on " + idx);
					}
				} else {
					lastIndex = idx;
					clickCnt[idx] = 1;
				}
				lastClickTime = System.currentTimeMillis();
				
			}
		});

		getContentPane().add(list);
		setVisible(true);
		
	}
	public static void main(String[] args) {
		new JListTest();
	}

	class MyListCellRenderer extends JLabel implements ListCellRenderer {

		/* (non-Javadoc)
		 * @see javax.swing.ListCellRenderer#getListCellRendererComponent(javax.swing.JList, java.lang.Object, int, boolean, boolean)
		 */
		public Component getListCellRendererComponent(
			JList list,
			Object value,
			int index,
			boolean isSelected,
			boolean cellHasFocus) {
			// TODO Auto-generated method stub
			setText(value.toString());
			if (clickCnt[index] == 2) {
				setForeground(Color.red);
			} else
				setForeground(Color.black);
			return this;
		}
	}
}

Siehe auch: http://java.sun.com/docs/books/tutorial/uiswing/components/combobox.html#renderer

Gruß Tom