SWT开发 - Combo的使用（2） - 事件处理

package com.test.swt;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class ComboSample02 {

    public static void main(String[] args){
        
        Display display = new Display ();
        final Shell shell = new Shell(display);
        shell.setLayout(new RowLayout());
                
        // read only style Combo
        Combo c3 = new Combo(shell,SWT.READ_ONLY);
        c3.add("c3-1", 0);
        c3.add("c3-2", 1);
        c3.select(0);
        
        final Text l = new Text(shell, SWT.NULL);
        
        
        c3.addSelectionListener(new SelectionListener() {
        
            public void widgetDefaultSelected(SelectionEvent e) {
                setSelectedValue(
                        ((Combo)e.widget).getSelectionIndex());
            }
        
            public void widgetSelected(SelectionEvent e) {
                setSelectedValue(
                        ((Combo)e.widget).getSelectionIndex());
            }
        
            private void setSelectedValue(int value) {
                l.setText(String.valueOf(value));
            }
        });
        
        shell.pack();
        shell.open();

        while (!shell.isDisposed ()){
          if (!display.readAndDispatch ()){
            display.sleep ();
          }
        }
        display.dispose ();
      }

}