simplemenudemo.java

java图形界面开发

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.*;

public class SimpleMenuDemo {

	public static Display myDisplay;
	public static boolean internalCall = false;

	public static void main(String[] args) {
		internalCall = true;
		myDisplay = new Display();
		SimpleMenuDemo md = new SimpleMenuDemo();
		md.runDemo(myDisplay);	
	}
	
	public void runDemo(Display display) {
		myDisplay = display;
		Shell shell = new Shell(display);
		shell.setText("Simple Menu Demo");
		
		//create the menu bar
		Menu menu = new Menu(shell, SWT.BAR);
		shell.setMenuBar(menu);

		//add the File option to it
		MenuItem file = new MenuItem(menu, SWT.CASCADE);
		file.setText("File");		
		
		//create a menu for the File option
		Menu filemenu = new Menu(shell, SWT.DROP_DOWN);
		file.setMenu(filemenu);

		//add a MenuItem to the File menu
		MenuItem actionItem = new MenuItem(filemenu, SWT.PUSH);
		actionItem.setText("Action");		

		//add a listener for the action
		actionItem.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event e) {
				System.out.println("Action performed!");			
			}
		});

		shell.setSize(300,300);
		shell.open();
		while(!shell.isDisposed())
			if(!display.readAndDispatch())
				display.sleep();
		if (internalCall) display.dispose();		
	}
}