Java Developer's Companion/Java Developer's Companion.iso/Javacup/IN4WJCXU.TAR/internet/IN4WJCXU/src/como/sys/RemoteFileDialog.java

Java Source | 1996-05-21 | 4.3 KB | 177 lines

/*
 * RemoteFileDialog    (c) 1996 Jan Kautz & Ulrich Gall
 *
 * Reads from a given file a list of files, which may
 * be loaded, if those files are pictures/sounds then
 * they may be displayed!
 */

package como.sys;

import como.io.*;
import como.awt.*;
import como.util.*;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.applet.*;


public class RemoteFileDialog extends Panel {
    public static final int PICTURE = 0;
    public static final int SOUND = 1;
    public static final int DATA = 99;

    ComObj comobj;
    List list = null;
    Button okbutton;
    Button cancelbutton;
    Button playsound;
    ImageButton imagebutton;
    Label imagename;
    Component notify;
    Vector files = null;
    int selected = -1;
    int type;

    public RemoteFileDialog() {
        super();
    }

    /**
     * The RemoteFileDialog is a helper-class, that opens a file on the server.
     * (same pathes as the ComObj.openInputStream()). This files contains filenames
     * that may be loaded. The RemoteFileDialog displays these filenames. You may
     * select one of these. If it is a known filetype (picture/sound must be
     * indicated in the first line of the filename-file), you can play/view
     * with a double-click on the filename. The syntax of the file:
     * first line: picture | sound | data.
     * next lines: filename : description.
     * @param comobj the ComObj.
     * @param filename the name of the file that contains the filenames
     * @param notify a Component that will be notified with an ACTION-Event,
     *  where the target is set to the RemoteFileDialog and the arg to
     *  the filename (null if cancel was pressed).
     */
    public RemoteFileDialog( ComObj comobj, String filename, Component notify ) {
        super();

        this.notify = notify;
        this.comobj = comobj;

        setLayout( new BorderLayout( 10, 10 ) );
        list = new List( 8, false );

        DataInputStream dis = new DataInputStream( comobj.openInputStream( filename ) );
        files = StreamLine.loadLines( dis );

        if( files == null || files.size() < 1 )
        {
            type = DATA;
            add( "Center", new Label( "Error loading "+filename ) );
            add( "South", cancelbutton = new Button( "OK" ) );

            layout();
            repaint();

            return;
        }

        Enumeration e = files.elements();
        String tp = (String)e.nextElement();
        if( tp.equalsIgnoreCase( "picture" ) ) type = PICTURE;
        else if( tp.equalsIgnoreCase( "sound" ) ) type = SOUND;
        else type = DATA;

        while( e.hasMoreElements() ) {
            list.addItem( (String)e.nextElement() );
        }

        add( "Center", list );

        Panel buttonpanel = new Panel();
        buttonpanel.setLayout( new FlowLayout( FlowLayout.CENTER ) );
        buttonpanel.add( okbutton = new Button( "OK" ) );
        buttonpanel.add( cancelbutton = new Button( "Cancel" ) );
        add( "South", buttonpanel );

        switch( type ) {
            case SOUND:
                add( "North", new Label( "Double click for sound." ) );
                break;

            case PICTURE:
                add( "North", new Label( "Double click to preview picture." ) );

                Panel imagepanel = new Panel();
                imagepanel.setLayout( new BorderLayout( 10, 10 ) );
                imagepanel.add( "Center", imagebutton = new ImageButton( 70, 70, " pic" ) );
                imagebutton.setNoPush( true );
                imagepanel.add( "North", imagename = new Label( "(pic name)" ) );
                add( "East", imagepanel );
                break;

            default:
                break;
        }

        layout();
        repaint();
    }

    public boolean handleEvent( Event evt ) {
        if( evt.target == list ) {
            selected = list.getSelectedIndex();
        }

        return super.handleEvent( evt );
    }

    public String getName( String all ) {
        String name = "unknown";
        int idx;

        idx = all.indexOf( ':' );

        if( idx < 0 ) name = all;
        else name = all.substring( 0, idx-1 );

        return name.trim();
    }

    public boolean action( Event evt, Object what ) {
        if( evt.target == okbutton && selected != -1 ) {
            String name = getName( (String)files.elementAt( selected+1 ) );

            notify.postEvent( new Event( this, Event.ACTION_EVENT, name ) );
            return true;
        }

        if( evt.target == cancelbutton ) {
            notify.postEvent( new Event( this, Event.ACTION_EVENT, null ) );

            return true;
        }

        if( evt.target == list ) {
            String file = getName( (String)evt.arg );

            switch( type ) {
                case SOUND:
                    AudioClip clip = comobj.loadAudioClip( file );
                    clip.play();
                    break;

                case PICTURE:
                    // TODO: show name of the image somewhere
                    Image img = comobj.loadImage( file );
                    imagebutton.setImages( img, img );
                    imagename.setText( file );
                    break;
            }
        }

        return false;
    }
}