mouseoverhintmanager.java

JRemoteControl is a simple Java&#8482 driven bluetooth remote control.It allows you to initiate virt

/*
 * http://articles.techrepublic.com.com/5100-3513-5185994.html#
 */

package fildiv.jremcntl.server.gui.util.swing;

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

public class MouseOverHintManager implements MouseListener {

	private Map hintMap;

	private JLabel hintLabel;

	public MouseOverHintManager(JLabel hintLabel) {

		hintMap = new WeakHashMap();

		this.hintLabel = hintLabel;

	}

	public void addHintFor(Component comp, String hintText) {

		hintMap.put(comp, hintText);

	}

	public void enableHints(Component comp) {

		comp.addMouseListener(this);

		if (comp instanceof Container) {

			Component[] components = ((Container) comp).getComponents();

			for (int i = 0; i < components.length; i++)

				enableHints(components[i]);

		}

		if (comp instanceof MenuElement) {

			MenuElement[] elements = ((MenuElement) comp).getSubElements();

			for (int i = 0; i < elements.length; i++)

				enableHints(elements[i].getComponent());

		}

	}

	private String getHintFor(Component comp) {

		String hint = (String) hintMap.get(comp);

		if (hint == null) {

			if (comp instanceof JLabel)

				hint = (String) hintMap.get(((JLabel) comp).getLabelFor());

			else if (comp instanceof JTableHeader)

				hint = (String) hintMap.get(((JTableHeader) comp).getTable());
			else if (comp instanceof AbstractButton) {
				
				AbstractButton b = (AbstractButton) comp;				
				Action act = b.getAction();
				
				if (act != null)
					hint = (String) act.getValue(Action.LONG_DESCRIPTION);
			
			} else if (comp instanceof JMenuItem) {
				
				JMenuItem item = (JMenuItem) comp;
				Action act = item.getAction();
				if (act != null)
					hint = (String) act.getValue(Action.LONG_DESCRIPTION);
			}
		}

		return hint;

	}

	public void mouseEntered(MouseEvent e) {

		Component comp = (Component) e.getSource();

		String hint;

		do {

			hint = getHintFor(comp);

			comp = comp.getParent();

		} while ((hint == null) && (comp != null));

		if (hint != null)

			hintLabel.setText(hint);

	}

	public void mouseExited(MouseEvent e) {

		hintLabel.setText("Ready ...");

	}

	public void mouseClicked(MouseEvent e) {
	}

	public void mousePressed(MouseEvent e) {
	}

	public void mouseReleased(MouseEvent e) {
	}

}