| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| /* |
| * Detect when the user scrolls a text control |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| */ |
| |
| public class Snippet191 { |
| public static void main(String[] args) { |
| Display display = new Display (); |
| Shell shell = new Shell (display); |
| shell.setLayout (new FillLayout ()); |
| final Text text = new Text (shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL); |
| for (int i=0; i<32; i++) { |
| text.append (i + "-This is a line of text in a widget-" + i + "\n"); |
| } |
| text.setSelection (0); |
| Listener listener = new Listener () { |
| int lastIndex = text.getTopIndex (); |
| public void handleEvent (Event e) { |
| int index = text.getTopIndex (); |
| if (index != lastIndex) { |
| lastIndex = index; |
| System.out.println ("Scrolled, topIndex=" + index); |
| } |
| } |
| }; |
| /* NOTE: Only detects scrolling by the user */ |
| text.addListener (SWT.MouseDown, listener); |
| text.addListener (SWT.MouseMove, listener); |
| text.addListener (SWT.MouseUp, listener); |
| text.addListener (SWT.KeyDown, listener); |
| text.addListener (SWT.KeyUp, listener); |
| text.addListener (SWT.Resize, listener); |
| ScrollBar hBar = text.getHorizontalBar(); |
| if (hBar != null) { |
| hBar.addListener (SWT.Selection, listener); |
| } |
| ScrollBar vBar = text.getVerticalBar(); |
| if (vBar != null) { |
| vBar.addListener (SWT.Selection, listener); |
| } |
| shell.pack (); |
| Point size = shell.computeSize (SWT.DEFAULT, SWT.DEFAULT); |
| shell.setSize (size. x - 32, size.y / 2); |
| shell.open (); |
| while (!shell.isDisposed ()) { |
| if (!display.readAndDispatch ()) display.sleep (); |
| } |
| display.dispose (); |
| } |
| } |