public class Options extends Applet
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>
