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Java > Open Source Codes > org > armedbear > j > HorizontalScrollBarListener


1 /*
2  * HorizontalScrollBarListener.java
3  *
4  * Copyright (C) 2000-2002 Peter Graves
5  * $Id: HorizontalScrollBarListener.java,v 1.1.1.1 2002/09/24 16:09:26 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version 2
10  * of the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 package org.armedbear.j;
23
24 import java.awt.event.AdjustmentEvent JavaDoc;
25 import java.awt.event.AdjustmentListener JavaDoc;
26
27 public final class HorizontalScrollBarListener implements AdjustmentListener JavaDoc
28 {
29     private Editor editor;
30
31     public HorizontalScrollBarListener(Editor editor)
32     {
33         this.editor = editor;
34     }
35
36     public void adjustmentValueChanged(AdjustmentEvent JavaDoc e)
37     {
38         if (editor.inScrollBarUpdate)
39             return;
40         final Display display = editor.getDisplay();
41         int value = e.getValue() / display.getCharWidth();
42         if (value != display.shift) {
43             int absCaretCol = display.getShift() + display.getCaretCol();
44             display.setShift(value);
45             display.setCaretCol(absCaretCol - value);
46             display.repaint();
47         }
48     }
49 }
50
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