[eclipse,swt] table tableviewer virtual

/*******************************************************************************
2     * Copyright (c) 2000, 2004 IBM Corporation and others.
3     * All rights reserved. This program and the accompanying materials
4     * are made available under the terms of the Eclipse Public License v1.0
5     * which accompanies this distribution, and is available at
6     * http://www.eclipse.org/legal/epl-v10.html
7     *
8     * Contributors:
9     * IBM Corporation - initial API and implementation
10     *******************************************************************************/
11     package org.eclipse.swt.snippets;
12    
13     /*
14     * Virtual Table example snippet: create a table with 1,000,000 items (lazy)
15     *
16     * For a list of all SWT example snippets see
17     * http://www.eclipse.org/swt/snippets/
18     *
19     * @since 3.0
20     */
21     import org.eclipse.swt.*;
22     import org.eclipse.swt.widgets.*;
23     import org.eclipse.swt.layout.*;
24    
25     public class Snippet144 {
26    
27     static final int COUNT = 1000000;
28    
29     public static void main(String[] args) {
30     Display display = new Display ();
31     final Shell shell = new Shell (display);
32     shell.setLayout (new RowLayout (SWT.VERTICAL));
33     final Table table = new Table (shell, SWT.VIRTUAL | SWT.BORDER);
34     table.addListener (SWT.SetData, new Listener () {
35     public void handleEvent (Event event) {
36     TableItem item = (TableItem) event.item;
37     int index = table.indexOf (item);
38     item.setText ("Item " + index);
39     System.out.println (item.getText ());
40     }
41     });
42     table.setLayoutData (new RowData (200, 200));
43     Button button = new Button (shell, SWT.PUSH);
44     button.setText ("Add Items");
45     final Label label = new Label(shell, SWT.NONE);
46     button.addListener (SWT.Selection, new Listener () {
47     public void handleEvent (Event event) {
48     long t1 = System.currentTimeMillis ();
49     table.setItemCount (COUNT);
50     long t2 = System.currentTimeMillis ();
51     label.setText ("Items: " + COUNT + ", Time: " + (t2 - t1) + " (ms)");
52     shell.layout ();
53     }
54     });
55     shell.pack ();
56     shell.open ();
57     while (!shell.isDisposed ()) {
58     if (!display.readAndDispatch ()) display.sleep ();
59     }
60     display.dispose ();
61     }
62     }

 

public class TableViewerVIRTUAL {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setBounds(10,10,300,300);
        Table table = new Table(shell, SWT.VIRTUAL);
        table.setBounds(10,10,200,200);
        final TableViewer viewer = new TableViewer(table);
        viewer.setItemCount(10000);   // <------
        viewer.setLabelProvider(new ITableLabelProvider() {
            public void removeListener(ILabelProviderListener listener) {}
            public boolean isLabelProperty(Object element, String property)
{
                return false;
            }
            public void dispose() {}
            public void addListener(ILabelProviderListener listener) {}
            public String getColumnText(Object element, int columnIndex) {
                return "virtual item: " +
String.valueOf(((Integer)element).intValue());
            }
            public Image getColumnImage(Object element, int columnIndex) {
                return null;
            }
        });
        viewer.setContentProvider(new ILazyContentProvider() {  // <------
            public void inputChanged(Viewer viewer, Object oldInput, Object
newInput) {}
            public void dispose() {}
            public void updateElement(int index) {
                System.out.println("setting: " + index);
                viewer.replace(new Integer(index), index);
            }
        });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) display.sleep();
        }
        display.dispose();
    }
}