Implements a semi-modal JInternalFrame

参考下面的 links，做了一个 semi-modal JInternalFrame：
Creating Modal Internal Frames -- Approach 1 and Approach 2
Java GUI - Make JInternalFrame behave like modal dialog
Java Technology Forums - Modal Internal Frames and JCombos

import java.beans.*;

import javax.swing.*;

public class JXFrame extends JFrame implements VetoableChangeListener {
	public void vetoableChange(PropertyChangeEvent evt)
			throws PropertyVetoException {
		if (evt.getPropertyName().equals(JXInternalFrame.IS_SELECTED_PROPERTY)) {
			if(evt.getSource() instanceof JXInternalFrame) {
				JXInternalFrame frame = (JXInternalFrame)evt.getSource();
				frame.selectChild();
			}
			throw new PropertyVetoException("Selected", null);
		}
	}
}

import java.awt.*;
import java.awt.event.*;
import java.beans.*;

import javax.swing.*;
import javax.swing.event.*;

public class JXInternalFrame extends JInternalFrame {
	private boolean modal = false;

	private JXInternalFrame parent = null;

	private JXInternalFrame child = null;

	private static JXFrame desktopFrame = null;

	private Component originalGlassPane;

	private GalssPaneForModal modalGlassPane;

	private Integer defaultCloseOperation = null;

	public JXInternalFrame() {
		super();
	}

	public JXInternalFrame(String title) {
		super(title, true, true, true, true);
	}

	public JXInternalFrame(JXInternalFrame parent, boolean modal, String title) {
		super(title, true, true, true, true);
		this.parent = parent;
		if (modal) {
			startModal();
		}
	}

	public JXInternalFrame(String title, boolean resizable) {
		super(title, resizable);
	}

	public JXInternalFrame(String title, boolean resizable, boolean closable) {
		super(title, resizable, closable);
	}

	public JXInternalFrame(String title, boolean resizable, boolean closable,
			boolean maximizable) {
		super(title, resizable, closable, maximizable);
	}

	public JXInternalFrame(String title, boolean resizable, boolean closable,
			boolean maximizable, boolean iconifiable) {
		super(title, resizable, closable, maximizable, iconifiable);
	}

	public boolean isModal() {
		return modal;
	}

	public void startModal() {
		if (!modal && parent != null && desktopFrame != null) {
			parent.setChild(this);
			originalGlassPane = parent.getGlassPane();
			modalGlassPane = new GalssPaneForModal();
			modalGlassPane.containerFrame = parent;
			parent.setGlassPane(modalGlassPane);
			parent.addVetoableChangeListener(desktopFrame);
			defaultCloseOperation = parent.getDefaultCloseOperation();
			parent.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
			modal = true;
		}
	}

	public void stopModal() {
		if (modal && parent != null && desktopFrame != null) {
			parent.setGlassPane(originalGlassPane);
			parent.removeVetoableChangeListener(desktopFrame);
			if (defaultCloseOperation != null) {
				parent.setDefaultCloseOperation(defaultCloseOperation);
			}
			try {
				parent.setSelected(true);
				if(parent.isIcon)
					parent.setIcon(false);
			} catch (PropertyVetoException e) {
				// TODO: handle exception
			}
			modal = false;
		}
	}

	public void setVisible(boolean visible) {
		super.setVisible(visible);
		if (!visible) {
			stopModal();
		}
	}

	public static void setDesktopFrame(JXFrame desktopFrame) {
		JXInternalFrame.desktopFrame = desktopFrame;
	}

	public JXInternalFrame getChild() {
		return child;
	}

	public void setChild(JXInternalFrame child) {
		this.child = child;
	}

	public void selectChild() {
		JXInternalFrame child = this;
		while(child.getChild() != null)
			child = child.getChild();
		try {
			child.setSelected(true);
		} catch (PropertyVetoException exception) {
			// TODO: handle exception
		}
	}
}

class GalssPaneForModal extends JComponent {
	JXInternalFrame containerFrame = null;

	public void setVisible(boolean visible) {
		super.setVisible(true);
	}

	public GalssPaneForModal() {

		this.setOpaque(false);
		MouseInputAdapter listener = new MouseInputAdapter() {
			@Override
			public void mousePressed(MouseEvent e) {
				containerFrame.selectChild();
			}
		};
		addMouseListener(listener);
		addMouseMotionListener(listener);
	}
}