playerpanel.java

FMJ（freedom media for java)是java视频开发的新选择

package net.sf.fmj.ejmf.toolkit.util;

import java.awt.BorderLayout;
import java.awt.Component;
import java.io.IOException;

import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.Player;
import javax.swing.JPanel;

/**
 * This class is a panel that is intended to display a
 * particular medium.  It is intended that all GUI layout take
 * place in the constructor, and that the media should begin
 * playing when begin() is called.  This will allow its parent
 * container to complete its own layout before the media plays.
 * <p>
 * Example:
 * <P>
 * <blockquote><pre>
 * Frame f = new Frame();
 * Player player = Utility.getPlayer("/ejmf/media/xmas.avi");
 * PlayerPanel p = new PlayerPanel(player);
 * Label l = new Label("Media example");<p>
 * //  Configure display
 * p.addControlComponent();
 * p.addVisualComponent();
 * add(p);
 * add(l);<p>
 * //  Display components
 * f.pack();
 * f.setvisible(true);<p>
 * //  Start media play
 * p.begin();
 * </pre></blockquote>
 * Note that it may be worthwhile to realize() the player in
 * the constructor of the PlayerPanel, so that when begin() is
 * called the components do not have to resize.
 * 
 * From the book: Essential JMF, Gordon, Talley (ISBN 0130801046).  Used with permission.
 * 
 * Modified by Ken Larson.
 *
 * @author     Steve Talley & Rob Gordon
 */

public class PlayerPanel extends JPanel {
    private static final Object _VISLOC = BorderLayout.CENTER;
    private static final Object _CPLOC = BorderLayout.SOUTH;
    private static final String LOADLABEL = "Loading Media...";

//    public TitledBorder
//        mediaBorder = new TitledBorder(
//            BorderConstants.etchedBorder, "Media" );

    private JPanel mediaPanel;
    private Player player;
//    private JLabel loadingLabel;

    /**
     * Constructs a PlayerPanel for the given MediaLocator.
     *
     * @exception  IOException
     *             If an I/O error occurs while accessing the
     *             media.
     *
     * @exception  NoPlayerException
     *             If a Player cannot be created from the given
     *             MediaLocator.
     */
    public PlayerPanel(MediaLocator locator)
        throws IOException, NoPlayerException
    {
        player = Manager.createPlayer(locator);

        this.setLayout(new BorderLayout());
        //this.setLayout(new BorderLayout());
        mediaPanel = new JPanel();
        mediaPanel.setLayout( new BorderLayout() );
        //mediaPanel.setBorder(mediaBorder);
       // setBorder( BorderConstants.emptyBorder );

//        loadingLabel =
//            new JLabel(LOADLABEL);
//
//        loadingLabel.setFont(
//            new Font("Dialog", Font.BOLD, 12) );
//
//        add(loadingLabel);
    }

    /**
     * Gets the Player for this PlayerPanel.
     */
    public Player getPlayer() {
        return player;
    }

    /**
     * Get the media panel component
     */
    public JPanel getMediaPanel() {
        return mediaPanel;
    }

    /**
     * Removes the initial "loading" label that appears while the
     * media is loading.
     */
//   public void removeLoadingLabel() {
//        if( isAncestorOf(loadingLabel) ) {
//            remove(loadingLabel);
//        }
//    }

    public void addMediaPanel() {
        if(! isAncestorOf(mediaPanel) ) {
            add(mediaPanel, BorderLayout.CENTER);
        }
    }

    /**
     * Adds a given component to the part of this PlayerPanel
     * reserved for its Player's visual component.
     *
     * @param      cc
     *             The Component to add.
     *
     * @return     The Component added.
     */
    public Component addVisualComponent(Component cc) {
        //removeLoadingLabel();
        addMediaPanel();

        return addComponent(cc, _VISLOC);
    }

    /**
     * Adds the Player's visual component to this PlayerPanel.
     *
     * @return     The Component added.
     */
    public Component addVisualComponent() {
        return addVisualComponent(
            player.getVisualComponent());
    }

    /**
     * Adds a given component to the part of this PlayerPanel
     * reserved for its Player's control component.
     *
     * @param      cc
     *             <addtext>
     *
     * @return     <addtext>
     */
    public Component addControlComponent(Component cc) {
        //removeLoadingLabel();
        addMediaPanel();

        return addComponent(cc, _CPLOC);
    }

    /**
     * Adds the Player's control component to this PlayerPanel.
     *
     * @return     <addtext>
     */
    public Component addControlComponent() {
        return addControlComponent(
            player.getControlPanelComponent());
    }

    private Component addComponent(
        Component c,
        Object constraints)
    {
        if(c == null) {
            return c;
        }

        mediaPanel.add(c, constraints);
        return c;
    }
}