ctlsigdisplay.java

本源码给出了在jbuilder下实现串口通信,并且如何使用

/*
 * @(#)CtlSigDisplay.java	1.1 98/06/02 SMI
 *
 * Author: Tom Corson
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * 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.
 */

package samples.ParallelBlackBox;

import java.awt.Panel;
import java.awt.Label;
import java.awt.Color;
import java.awt.FlowLayout;

import javax.comm.ParallelPort;

public class CtlSigDisplay
    extends Panel {
  ParallelPort port = null;
  Label SELLabel,
  BSYLabel,
  TOLabel,
  PELabel,
  POLabel,
  BELabel;
  boolean DA,
  BE;
  private Color onColor,
  offColor;

  public CtlSigDisplay(ParallelPort port) {
    super();

    this.setPort(port);

    this.setLayout(new FlowLayout());

    SELLabel = new Label("SEL");
    this.add(SELLabel);

    BSYLabel = new Label("BSY");
    this.add(BSYLabel);

    TOLabel = new Label("TO");
    this.add(TOLabel);

    PELabel = new Label("PE");
    this.add(PELabel);

    POLabel = new Label("PO");
    this.add(POLabel);

    DA = false;

    BELabel = new Label("BE");
    this.add(BELabel);
    BE = true;

    onColor = Color.green;
    offColor = Color.black;
  }

  public void setPort(ParallelPort port) {
    this.port = port;
  }

  public void showValues() {
    if (this.port != null) {
      /*
       *  Get the state of the control signals for this port
       */

      SELLabel.setForeground(port.isPrinterSelected()
                             ? onColor : offColor);

      BSYLabel.setForeground(port.isPrinterBusy()
                             ? onColor : offColor);
    }
  }

  public void showErrorValues() {
    if (this.port != null) {
      /*
       *  Get the state of the error conditions for this port
       */


      TOLabel.setForeground(port.isPrinterTimedOut()
                            ? onColor : offColor);

      PELabel.setForeground(port.isPrinterError()
                            ? onColor : offColor);

      POLabel.setForeground(port.isPaperOut() ? onColor : offColor);

      BELabel.setForeground(BE ? onColor : offColor);
    }
  }

  public void clearValues() {
    SELLabel.setForeground(offColor);
    BSYLabel.setForeground(offColor);
  }

  public void clearErrorValues() {
    TOLabel.setForeground(offColor);
    PELabel.setForeground(offColor);
    POLabel.setForeground(offColor);
    BELabel.setForeground(offColor);
  }
}