trackpanel.java

里面是关于jmf编程的例子,希望能给初学者带来一些帮助

/*
 * @(#)TrackPanel.java	1.1 00/02/10
 *
 * Copyright (c) 1999 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 jmapps.ui;

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.media.*;
import javax.media.control.*;
//import javax.media.Format;
//import javax.media.format.*;
//import javax.media.format.*;
//import javax.media.protocol.*;
//import javax.media.datasink.*;



public abstract class TrackPanel extends JMPanel {

    protected TrackControl      trackControl = null;
    protected Format            arrSupportedFormats [] = null;
    protected Vector            vectorContSuppFormats = new Vector ();
    protected ActionListener    listenerEnableTrack = null;


    public TrackPanel( TrackControl trackControl, ActionListener listenerEnableTrack ) {
        this.trackControl = trackControl;
        this.listenerEnableTrack = listenerEnableTrack;
        this.arrSupportedFormats = trackControl.getSupportedFormats ();
    }


    public TrackControl getTrackControl () {
        return ( trackControl );
    }

    public void updateTrack () {
        Format         format;

        if ( isTrackEnabled() == false ) {
            trackControl.setEnabled ( false );
            return;
        }
        format = getFormat ();
        if ( format == null ) {
            MessageDialog.createErrorDialog ( getFrame(), "Internal error. " +
					      "Unable to match choosen format. Track will be disabled." );
            trackControl.setEnabled ( false );
        }
        else {
            trackControl.setEnabled ( true );
            trackControl.setFormat ( format );
        }
    }

    public abstract boolean isTrackEnabled ();
    public abstract Format getFormat ();

}