01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
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: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32:
33: package com.vividsolutions.jump.workbench.ui;
34:
35: import java.awt.event.KeyAdapter;
36: import java.awt.event.KeyEvent;
37: import java.util.Date;
38:
39: import javax.swing.JList;
40:
41: /**
42: * When the user types into a JList, scrolls the JList to that item.
43: */
44: public class JListTypeAheadKeyListener extends KeyAdapter {
45: private JList list;
46: private String buffer = "";
47: private Date bufferUpdateTime = new Date();
48: private int bufferLifetimeInMilliseconds = 1000;
49:
50: public JListTypeAheadKeyListener(JList list) {
51: this .list = list;
52: }
53:
54: public void keyTyped(KeyEvent e) {
55: updateBuffer(e.getKeyChar());
56:
57: for (int i = 0; i < list.getModel().getSize(); i++) {
58: if (list.getModel().getElementAt(i).toString()
59: .toUpperCase().indexOf(buffer.toUpperCase()) == 0) {
60: list.setSelectedValue(list.getModel().getElementAt(i),
61: true);
62:
63: break;
64: }
65: }
66: }
67:
68: private void updateBuffer(char c) {
69: Date newBufferUpdateTime = new Date();
70:
71: if ((newBufferUpdateTime.getTime() - bufferUpdateTime.getTime()) > bufferLifetimeInMilliseconds) {
72: buffer = "";
73: }
74:
75: bufferUpdateTime = newBufferUpdateTime;
76:
77: if (c != KeyEvent.CHAR_UNDEFINED) {
78: buffer += c;
79: }
80: }
81: }
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