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Java > Open Source Codes > org > nightlabs > editor2d > viewer > swt > SWTCanvasAutoScrollSupport


1 /* *****************************************************************************
2  * NightLabs Editor2D - Graphical editor framework *
3  * Copyright (C) 2004-2005 NightLabs - http://NightLabs.org *
4  * *
5  * This library is free software; you can redistribute it and/or *
6  * modify it under the terms of the GNU Lesser General Public *
7  * License as published by the Free Software Foundation; either *
8  * version 2.1 of the License, or (at your option) any later version. *
9  * *
10  * This library is distributed in the hope that it will be useful, *
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
13  * Lesser General Public License for more details. *
14  * *
15  * You should have received a copy of the GNU Lesser General Public *
16  * License along with this library; if not, write to the *
17  * Free Software Foundation, Inc., *
18  * 51 Franklin St, Fifth Floor, *
19  * Boston, MA 02110-1301 USA *
20  * *
21  * Or get it online : *
22  * http://www.gnu.org/copyleft/lesser.html *
23  * *
24  * *
25  ******************************************************************************/
26
27 package org.nightlabs.editor2d.viewer.swt;
28
29 import org.eclipse.swt.widgets.Control;
30
31 import org.nightlabs.editor2d.viewer.ICanvas;
32
33 public class SWTCanvasAutoScrollSupport
34 extends AbstractSWTAutoScrollSupport
35 {
36     public SWTCanvasAutoScrollSupport(Control control) {
37         super(control);
38     }
39     
40     protected ICanvas getCanvas() {
41         return (ICanvas) getControl();
42     }
43     
44     protected void scrollDown(int scrollStep) {
45         getCanvas().translateY(scrollStep);
46         getCanvas().repaint();
47     }
48
49     protected void scrollUp(int scrollStep) {
50         getCanvas().translateY(-scrollStep);
51         getCanvas().repaint();
52     }
53
54     protected void scrollLeft(int scrollStep) {
55         getCanvas().translateX(scrollStep);
56         getCanvas().repaint();
57     }
58
59     protected void scrollRight(int scrollStep) {
60         getCanvas().translateX(-scrollStep);
61         getCanvas().repaint();
62     }
63
64 }
65
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