A typed listener can be used to listen for only one particular typed event.
For example, SelectionListener is a typed listener for event SelectionEvent.
Untyped event listeners offer a generic, low-level mechanism to listen for events.
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class GenericEventUntyped {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
Button button = new Button(shell, SWT.NONE);
button.setText("Click and check the console");
button.addSelectionListener(new SelectionListener() {
public void widgetSelected(SelectionEvent arg0) {
System.out.println("widgetSelected");
}
public void widgetDefaultSelected(SelectionEvent arg0) {
System.out.println("widgetDefaultSelected");
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
}