portrequesteddialog.java

java communications api 3.0

/*
 * @(#)PortRequestedDialog.java	1.7 00/05/04 SMI
 * 
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 * 
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license
 * to use, modify and redistribute this software in source and binary
 * code form, provided that i) this copyright notice and license appear
 * on all copies of the software; and ii) Licensee does not utilize the
 * software in a manner which is disparaging to Sun.
 * 
 * This software is provided "AS IS," without a warranty of any kind.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
 * SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
 * BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
 * OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * This software is not designed or intended for use in on-line control
 * of aircraft, air traffic, aircraft navigation or aircraft
 * communications; or in the design, construction, operation or
 * maintenance of any nuclear facility. Licensee represents and
 * warrants that it will not use or redistribute the Software for such
 * purposes.
 */
import java.awt.*;
import java.awt.event.*;
import javax.comm.*;

/**
 * Informs the user that an other application has requested the port they
 * are using, and then asks if they are willing to give it up. If the user
 * answers "Yes" the port is closed and the dialog is closed, if the user
 * answers "No" the dialog closes and no other action is taken.
 */
public class PortRequestedDialog extends Dialog implements ActionListener {
    private SerialDemo parent;

    /**
     * Creates the a dialog with two buttons and a message asking the user if
     * they are willing to give up the port they are using.
     * @param parent The main SerialDemo object.
     */
    public PortRequestedDialog(SerialDemo parent) {
	super(parent, "Port Requested!", true);

	this.parent = parent;

	String lineOne = "Your port has been requested";
	String lineTwo = "by an other application.";
	String lineThree = "Do you want to give up your port?";
	Panel  labelPanel = new Panel();

	labelPanel.setLayout(new GridLayout(3, 1));
	labelPanel.add(new Label(lineOne, Label.CENTER));
	labelPanel.add(new Label(lineTwo, Label.CENTER));
	labelPanel.add(new Label(lineThree, Label.CENTER));
	add(labelPanel, "Center");

	Panel  buttonPanel = new Panel();
	Button yesButton = new Button("Yes");

	yesButton.addActionListener(this);
	buttonPanel.add(yesButton);

	Button noButton = new Button("No");

	noButton.addActionListener(this);
	buttonPanel.add(noButton);
	add(buttonPanel, "South");

	FontMetrics fm = getFontMetrics(getFont());
	int	    width = Math.max(fm.stringWidth(lineOne), 
				     Math.max(fm.stringWidth(lineTwo), 
					      fm.stringWidth(lineThree)));

	setSize(width + 40, 150);
	setLocation(parent.getLocationOnScreen().x + 30, 
		    parent.getLocationOnScreen().y + 30);
	setVisible(true);
    }

    /**
     * Handles events generated by the buttons. If the yes button in pushed the
     * port closing routine is called and the dialog is disposed of. If the "No"
     * button is pushed the dialog is disposed of.
     */
    public void actionPerformed(ActionEvent e) {
	String cmd = e.getActionCommand();

	if (cmd.equals("Yes")) {
	    parent.portClosed();
	} 

	setVisible(false);
	dispose();
    } 

}