FocusListener is informed when a control gains or loses the focus.
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.layout.GridData;
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 FocusListenerUsing {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(3, true));
shell.setText("One Potato, Two Potato");
// Create the focus listener
FocusListener listener = new FocusListener() {
public void focusGained(FocusEvent event) {
Button button = (Button) event.getSource();
button.setText("I'm It!");
}
public void focusLost(FocusEvent event) {
Button button = (Button) event.getSource();
button.setText("Pick Me!");
}
};
// Create the buttons and add the listener to each one
for (int i = 0; i < 6; i++) {
Button button = new Button(shell, SWT.PUSH);
button.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
button.setText("Pick Me!");
button.addFocusListener(listener);
}
// Display the window
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}