Programming Languages Suite/ProgLangD.iso/VCAFE.3.0A/Sample.bin/Applet1.java

Text File | 1997-09-06 | 6KB | 241 lines

/*
 *  Applet1.java
 *
 *  This file contains class Applet1 and class OnOffButton.
 *
 *  class Applet1 is an Applet that contains a ScrollingText display.
 *  with the following controls, an OnOffButton that can pause and start
 *  the display; a textfield that controls the text being displayed;
 *  and 2 checkboxes that selects the position of the ScrollingText.
 */

package samples.conversion;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import symantec.itools.awt.*;

public class Applet1 extends Applet
{
    ScrollingText st;
    OnOffButton button;
    TextField textField;
    Checkbox cb_center;
    Checkbox cb_random;

    public void init()
    {
        setLayout( null );
        setSize( 360, 420 );
        setBackground( Color.lightGray );

       /*
        *  add a ScrollingText object.
        */

        st = new ScrollingText( "SYMANTEC.   Visual Cafe. ", 320, 240 );
        add( st );
        st.setLocation( 20, 20 );
        st.start();

        Cursor handCursor = new Cursor( Cursor.HAND_CURSOR );

       /*
        *  add a text field with corresponding label beside it.
        */

        Label textLabel = new Label( "Text" );
        textLabel.setFont( new Font( "Dialog", Font.PLAIN, 12 ) );
        add( textLabel );
        textLabel.setBounds( 20, 280, 30, 20 );

        textField = new TextField( st.getText() );
        textField.setFont( new Font( "TimesRoman", Font.PLAIN, 12 ) );
        add( textField );
        textField.setBounds( 60, 280, 280, 20 );
        textField.addTextListener( new TextAdapter() );

       /*
        *  add checkboxes "Center" and "Random".
        *  place them in a symantec.itools.awt.BorderPanel.
        */

        BorderPanel borderPanel = new BorderPanel( "Position", BorderPanel.ALIGN_LEFT, BorderPanel.BEVEL_LOWERED );
        borderPanel.setLayout( new FlowLayout() );
        CheckboxGroup checkboxGrp = new CheckboxGroup();
        cb_center = new Checkbox( "Center", checkboxGrp, false );
        cb_random = new Checkbox( "Random", checkboxGrp, true );
        cb_center.addItemListener( new ItemAdapter1() );
        cb_random.addItemListener( new ItemAdapter2() );
        cb_center.setCursor( handCursor );
        cb_random.setCursor( handCursor );
        borderPanel.add( cb_center );
        borderPanel.add( cb_random );

        add( borderPanel );
        borderPanel.setBounds( 20, 310, 180, 75 );

       /*
        *  add an OnOffButton.
        */

        button = new OnOffButton( OnOffButton.ON );
        add( button );
        button.setBounds( 220, 320, 120, 60 );
        button.addActionListener( new Action() );
        button.setCursor( handCursor );
    }

    public void start()
    {
        repaint();
    }

    public void stop()
    {
        st.stop();
    }

    public void paint( Graphics g )
    {
       /*
        *  draw borders for scrolling text display.
        */

        g.setColor( Color.white );
        g.drawRect( 20, 20, st.getSize().width + 2, st.getSize().height + 2 );
        g.setColor( Color.darkGray );
        g.drawRect( 19, 19, st.getSize().width + 2, st.getSize().height + 2 );
    }

    class Action implements ActionListener
    {
       /*
        *  inner class that handles the button's event.
        */

        public void actionPerformed( ActionEvent e )
        {
            if( button.getState() == OnOffButton.ON )
                st.start();
            else
                st.stop();
        }
    }

    class TextAdapter implements TextListener
    {
       /*
        *  inner class that handles the text field's event.
        */

        public void textValueChanged( TextEvent e )
        {
            st.stop();
            button.setState( OnOffButton.OFF );
            st.setText( textField.getText() );
        }
    }

    class ItemAdapter1 implements ItemListener
    {
       /*
        *  inner class that handles the checkbox cb_center's event.
        */

        public void itemStateChanged( ItemEvent e )
        {
            st.stop();
            button.setState( OnOffButton.OFF );

            if( e.getStateChange() == ItemEvent.SELECTED )
                st.setPosition( ScrollingText.CENTER );
        }
    }

    class ItemAdapter2 implements ItemListener
    {
       /*
        *  inner class that handles the checkbox cb_random's event.
        */

        public void itemStateChanged( ItemEvent e )
        {
            st.stop();
            button.setState( OnOffButton.OFF );

            if( e.getStateChange() == ItemEvent.SELECTED )
                st.setPosition( ScrollingText.RANDOM );
        }
    }
}



class OnOffButton extends Button
{
   /*
    *  OnOffButton provides a Button that
    *  is a switch between an on and an off state.
    */

    final static boolean ON = true;
    final static boolean OFF = false;
    protected boolean state;
    protected String onText = "Go";
    protected String offText = "Stop!";

    OnOffButton( boolean s )
    {
        setFont( new Font( "Dialog", Font.PLAIN, 12 ) );
        setBackground( Color.lightGray );
        state = s;
        if( state == ON )
            setLabel( offText );
        else
            setLabel( onText );

        addActionListener( new Action() );
        repaint();
    }

    public boolean getState()
    {
        return state;
    }

    public void setState( boolean s )
    {
        state = s;
        if( state == ON )
            setLabel( offText );
        else
            setLabel( onText );
        repaint();
    }

    class Action implements ActionListener
    {
        public void actionPerformed( ActionEvent e )
        {
            state = !state;
            if( state == ON )
                setLabel( offText );
            else
                setLabel( onText );
            repaint();
        }
    }

    public void update( Graphics g )
    {
        paint( g );
    }
}