Исходный текст аплета Options

Исходный текст аплета Options представлен в листинге 1.

Листинг 1. Файл Options.java

import java.applet.*;

import java.awt.*;

public class Options extends Applet

{

  FirstPanel pPanel1;

  CardPanel pCard;

  ControlPanel pControl;

  public String getAppletInfo()

  {

    return "Name: Options";

  }

  public void init()

  {

    setLayout(new GridLayout(3, 1));

    pPanel1 = new FirstPanel();

    add(pPanel1);

    pCard = new CardPanel(pPanel1);

    add(pCard);

    pControl = new ControlPanel(pCard);

    add(pControl);

    pPanel1.setBackground(Color.yellow);

    pPanel1.setForeground(Color.black);

    repaint();

  }

}

class FirstPanel extends Panel

{

  String szFontName = "TimesRoman";

  public void paint(Graphics g)

  {

    Dimension dimAppWndDimension = getSize();

    g.drawRect(0, 0, 

      dimAppWndDimension.width  - 1, 

      dimAppWndDimension.height - 1);

    g.setFont(new Font(szFontName,

      Font.PLAIN, 24));

    g.drawString("First panel", 10, 50);

    super.paint(g);

  }

}

class CardPanel extends Panel

{

  Panel pBgColor;

  Panel pFgColor;

  Panel pFont;

  Panel pControlled;

  Choice chBgColor;

  Choice chFgColor;

  Choice chFont;

  Label lbBgColor;

  Label lbFgColor;

  Label lbFont;

  public CardPanel(Panel pControlledPanel)

  {

    pControlled = pControlledPanel;

    setLayout(new CardLayout(5, 5));

    pBgColor = new Panel();

    pFgColor = new Panel();

    pFont    = new Panel();

    add("BgColor", pBgColor);

    add("FgColor", pFgColor);

    add("Font", pFont);

    chBgColor = new Choice();

    chFgColor = new Choice();

    chFont    = new Choice();

    chBgColor.add("Yellow");

    chBgColor.add("Green");

    chBgColor.add("White");

    chFgColor.add("Black");

    chFgColor.add("Red");

    chFgColor.add("Green");

    chFont.add("TimesRoman");

    chFont.add("Helvetica");

    chFont.add("Courier");

    lbBgColor = new Label("Background color");

    lbFgColor = new Label("Foreground color");

    lbFont = new Label("Font");

    pBgColor.add(lbBgColor);

    pBgColor.add(chBgColor);

    pFgColor.add(lbFgColor);

    pFgColor.add(chFgColor);

    pFont.add(lbFont);

    pFont.add(chFont);

  }  

  public void paint(Graphics g)

  {

    Dimension dimAppWndDimension = getSize();

    g.drawRect(0, 0, 

      dimAppWndDimension.width  - 1, 

      dimAppWndDimension.height - 1);

    super.paint(g);

  }

  public boolean action(Event evt, Object obj)

  {

    Choice ch; 

    if(evt.target instanceof Choice)

    {

      ch = (Choice)evt.target;

      if(evt.target.equals(chBgColor))

      {

	if(ch.getSelectedIndex() == 0)

	  pControlled.setBackground(

            Color.yellow);

	else if(ch.getSelectedIndex() == 1)

	  pControlled.setBackground(

            Color.green);

	else if(ch.getSelectedIndex() == 2)

	  pControlled.setBackground(

            Color.white);

      }

      else if(evt.target.equals(chFgColor))

      {

	if(ch.getSelectedIndex() == 0)

	  pControlled.setForeground(

            Color.black);

	else if(ch.getSelectedIndex() == 1)

	  pControlled.setForeground(

            Color.red);

	else if(ch.getSelectedIndex() == 2)

	  pControlled.setForeground(

            Color.green);

      }

      else if(evt.target.equals(chFont))

      {

	if(ch.getSelectedIndex() == 0)

	  ((FirstPanel)pControlled).szFontName

            = "TimesRoman";

	else if(ch.getSelectedIndex() == 1)

	  ((FirstPanel)pControlled).szFontName

            = "Helvetica";

	else if(ch.getSelectedIndex() == 2)

	  ((FirstPanel)pControlled).szFontName

            = "Courier";

      }

      else

      {

	return false;

      }

      pControlled.repaint();

      return true;

    }

    return false;

  }

}

class ControlPanel extends Panel

{

  Button btNext;

  Button btPrev;

  Button btBgColor;

  Button btFgColor;

  Button btFont;

  Panel pCard;

  public ControlPanel(Panel pCardPanel)

  {

    pCard = pCardPanel;

    setLayout(new GridLayout(2,3));

    btBgColor = new Button("Background Color");

    btFgColor = new Button("Foreground Color");

    btFont = new Button("Set Font");

    btNext = new Button("Next");

    btPrev = new Button("Prev");

    add(btBgColor);

    add(btFgColor);

    add(btFont);

    add(btNext);

    add(btPrev);

  }

  public boolean action(Event evt, Object obj)

  {

    if(evt.target instanceof Button)

    {

      if(evt.target.equals(btBgColor))

      {

	((CardLayout)pCard.getLayout()).show(

            pCard, "BgColor");

      }

      else if(evt.target.equals(btFgColor))

      {

	((CardLayout)pCard.getLayout()).show(

            pCard, "FgColor");

      }

      else if(evt.target.equals(btFont))

      {

	((CardLayout)pCard.getLayout()).show(

            pCard, "Font");

      }

      else if(evt.target.equals(btNext))

      {

	((CardLayout)pCard.getLayout()).next(

            pCard);

      }

      else if(evt.target.equals(btPrev))

      {

	((CardLayout)pCard.getLayout()).

            previous(pCard);

      }

      else

      {

	return false;

      }

      return true;

    }

    return false;

  }

}

Исходный текст документа HTML, созданный для аплета Options системой Java WorkShop, представлен в листинге 2.

Листинг 2. Файл Options.tmp.html

<applet name="Options"

  code="Options" 

  codebase=

"file:/E:/Sun/Articles/vol8/src/Options"

  width="500"

  height="600"

  align="Top"

  alt="If you had a java-enabled browser,

 you would see an applet here.">

 <hr>If your browser recognized the applet tag,

you would see an applet here.<hr>

</applet>