Java Tutorial/SWT/Button Event

Selection Events

Selection events are generated when buttons get selected and pressed. There are two methods defined in the SelectionListener interface:

   <source lang="java">

public void widgetSelection(SelectionEvent e)

   public void widgetDefaultSelection(SelectionEvent e)</source>
   
  
 
  

To add a listener to a button

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class ButtonWithEventListener {

 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.addListener(SWT.Selection, new Listener() {
     public void handleEvent(Event e) {
       switch (e.type) {
       case SWT.Selection:
         System.out.println("Button pressed");
         break;
       }
     }
   });
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) {
       display.sleep();
     }
   }
 }

}</source>