Java SWT List Tutorial with Examples

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SWT List
SWT List Example

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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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