/*
* @(#)ManyBalls.java 1.16 02/07/25 @(#)
*
* Copyright (c) 1999-2001 Sun Microsystems, Inc. All rights reserved.
* PROPRIETARY/CONFIDENTIAL
* Use is subject to license terms.
*/
package example.manyballs;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import example.About;
public class ManyBalls extends MIDlet implements CommandListener {
Display display;
ManyCanvas canvas; // The main screen
private Command exitCommand = new Command("Exit", Command.EXIT, 99);
private Command toggleCommand = new Command("Stop/Go", Command.SCREEN, 1);
private Command helpCommand = new Command("Help", Command.HELP, 2);
private Command aboutCommand = new Command("About", Command.HELP, 30);
private Form helpScreen;
private String helpText = "^ = faster\n v = slower\n < = fewer\n> = more";
// the GUI buttons
// Button exitButton, clearButton, moreButton, lessButton;
/*
* Create the canvas
*/
public ManyBalls() {
display = Display.getDisplay(this);
canvas = new ManyCanvas(display, 40);
canvas.addCommand(exitCommand);
canvas.addCommand(toggleCommand);
canvas.addCommand(helpCommand);
canvas.addCommand(aboutCommand);
canvas.setCommandListener(this);
}
public void startApp() throws MIDletStateChangeException {
canvas.start();
}
public void pauseApp() {
canvas.pause();
}
public void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
canvas.destroy();
}
/*
* Respond to a command issued on the Canvas.
*/
public void commandAction(Command c, Displayable s) {
if (c == toggleCommand) {
if (canvas.isPaused())
canvas.start();
else
canvas.pause();
} else if (c == helpCommand) {
canvas.pause();
showHelp();
} else if (c == exitCommand) {
try {
destroyApp(false);
notifyDestroyed();
} catch (MIDletStateChangeException ex) {
}
} else if (c == aboutCommand) {
About.showAbout(display);
}
}
/*
* Put up the help screen. Create it if necessary.
* Add only the Resume command.
*/
void showHelp() {
if (helpScreen == null) {
helpScreen = new Form("Many Balls Help");
helpScreen.append("^ = faster\n");
helpScreen.append("v = slower\n");
helpScreen.append("< = fewer\n");
helpScreen.append("> = more\n");
}
helpScreen.addCommand(toggleCommand);
helpScreen.setCommandListener(this);
display.setCurrent(helpScreen);
}
}
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