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


1 /*
2  * SidebarTree.java
3  *
4  * Copyright (C) 2000-2002 Peter Graves
5  * $Id: SidebarTree.java,v 1.1.1.1 2002/09/24 16:09:18 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.Rectangle JavaDoc;
25 import javax.swing.JTree JavaDoc;
26 import javax.swing.tree.DefaultMutableTreeNode JavaDoc;
27 import javax.swing.tree.TreeModel JavaDoc;
28 import javax.swing.tree.TreePath JavaDoc;
29
30 public class SidebarTree extends JTree JavaDoc
31 {
32     public SidebarTree(TreeModel JavaDoc model)
33     {
34         super(model);
35     }
36
37     protected void scrollNodeToCenter(DefaultMutableTreeNode JavaDoc node)
38     {
39         TreePath JavaDoc treePath = new TreePath JavaDoc(node.getPath());
40         TreePath JavaDoc parentPath = treePath.getParentPath();
41         if (parentPath != null)
42             expandPath(parentPath);
43         int row = getRowForPath(treePath);
44         scrollRowToCenter(row);
45         setSelectionRow(row);
46     }
47
48     protected void scrollRowToCenter(int row)
49     {
50         Rectangle JavaDoc rect = getVisibleRect();
51         int top = getClosestRowForLocation(rect.x, rect.y);
52         int bottom = top + getVisibleRowCount() - 1;
53         int margin = getVisibleRowCount() / 4;
54         int first = row - margin;
55         if (first < 0)
56             first = 0;
57         int last = row + margin;
58         if (last > getRowCount() - 1)
59             last = getRowCount() - 1;
60         if (first < top || first > bottom) {
61             scrollRowToVisible(first);
62             rect = getVisibleRect();
63             top = getClosestRowForLocation(rect.x, rect.y);
64             bottom = top + getVisibleRowCount() - 1;
65         }
66         if (last < top || last > bottom)
67             scrollRowToVisible(last);
68     }
69 }
70
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