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Java > Open Source Codes > org > eclipse > jface > text > IViewportListener


1 /*******************************************************************************
2  * Copyright (c) 2000, 2005 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.jface.text;
12
13
14
15 /**
16  * Registered with a text viewer, view port listeners are informed about changes
17  * of a text viewer's view port. The view port is that portion of the viewer's
18  * document which is visible in the viewer.
19  * <p>
20  * Clients may implement this interface.</p>
21  *
22  * @see org.eclipse.jface.text.ITextViewer
23  */
24 public interface IViewportListener {
25
26     /**
27      * Informs about view port changes. The given vertical position is the new
28      * vertical scrolling offset measured in pixels.
29      *
30      * @param verticalOffset the vertical offset measured in pixels
31      */
32     void viewportChanged(int verticalOffset);
33 }
34
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