o7planning

Java SWT List Tutorial with Examples

  1. SWT List
  2. SWT List Example

1. SWT List

SWT List is UI component which displays the item list as strings, and allow the user to select one or more items.
Note: SWT List is a common UI component of a SWT application but the SWT List has some disadvantages below:
SWT List only contains items (List Items) with the String type.
List-Items can not display icons.
To overcome the above disadvantages you can use SWT Table instead of SWT List.
The styles can be applied to SWT List:
  • SWT.BORDER
  • SWT.MULTI: Allow you to select one or more items.
  • SWT.SINGLE: Allow you select the only item.
  • SWT.V_SCROLL: Display vertical scroll bar.
  • SWT.H_SCROLL: Display horizontal scroll bar.

2. SWT List Example

ListDemo.java
package org.o7planning.swt.list;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;

public class ListDemo {

   public static void main(String[] args) {
       Display display = new Display();
       Shell shell = new Shell(display);
       shell.setText("SWT List (o7planning.org)");
       shell.setSize(450, 200);

       RowLayout layout = new RowLayout(SWT.VERTICAL);
       layout.spacing = 10;
       layout.marginHeight = 10;
       layout.marginWidth = 10;

       shell.setLayout(layout);

       // Create a List
       // (Allows selecte multiple lines and display vertical scroll bar.).
       final List list = new List(shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
       list.setLayoutData(new RowData(240, 100));

       list.add("Apple");
       list.add("Apricot");
       list.add("Banana");
       list.add("Carrot");
       list.add("Cherry");
       list.add("Courgette");
       list.add("Endive");
       list.add("Grape");

       Label label = new Label(shell, SWT.NONE);
       label.setLayoutData(new RowData(240, SWT.DEFAULT));

       list.addSelectionListener(new SelectionAdapter() {

           @Override
           public void widgetSelected(SelectionEvent event) {
               int[] selections = list.getSelectionIndices();
               String outText = "";
               for (int i = 0; i < selections.length; i++) {
                   outText += selections[i] + " ";
               }
               label.setText("You selected: " + outText);
           }

       });

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

}

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