01: /*
02: * SidebarTree.java
03: *
04: * Copyright (C) 2000-2002 Peter Graves
05: * $Id: SidebarTree.java,v 1.1.1.1 2002/09/24 16:09:18 piso Exp $
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * 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;
25: import javax.swing.JTree;
26: import javax.swing.tree.DefaultMutableTreeNode;
27: import javax.swing.tree.TreeModel;
28: import javax.swing.tree.TreePath;
29:
30: public class SidebarTree extends JTree {
31: public SidebarTree(TreeModel model) {
32: super (model);
33: }
34:
35: protected void scrollNodeToCenter(DefaultMutableTreeNode node) {
36: TreePath treePath = new TreePath(node.getPath());
37: TreePath parentPath = treePath.getParentPath();
38: if (parentPath != null)
39: expandPath(parentPath);
40: int row = getRowForPath(treePath);
41: scrollRowToCenter(row);
42: setSelectionRow(row);
43: }
44:
45: protected void scrollRowToCenter(int row) {
46: Rectangle rect = getVisibleRect();
47: int top = getClosestRowForLocation(rect.x, rect.y);
48: int bottom = top + getVisibleRowCount() - 1;
49: int margin = getVisibleRowCount() / 4;
50: int first = row - margin;
51: if (first < 0)
52: first = 0;
53: int last = row + margin;
54: if (last > getRowCount() - 1)
55: last = getRowCount() - 1;
56: if (first < top || first > bottom) {
57: scrollRowToVisible(first);
58: rect = getVisibleRect();
59: top = getClosestRowForLocation(rect.x, rect.y);
60: bottom = top + getVisibleRowCount() - 1;
61: }
62: if (last < top || last > bottom)
63: scrollRowToVisible(last);
64: }
65: }
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