01: /*
02: * Copyright (c) 2005-2008 Substance Kirill Grouchnikov. All Rights Reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * o Redistributions of source code must retain the above copyright notice,
08: * this list of conditions and the following disclaimer.
09: *
10: * o Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * o Neither the name of Substance Kirill Grouchnikov nor the names of
15: * its contributors may be used to endorse or promote products derived
16: * from this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
27: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
28: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30: package org.jvnet.substance.combo;
31:
32: import java.awt.Component;
33:
34: import javax.swing.JComboBox;
35: import javax.swing.JList;
36:
37: import org.jvnet.substance.SubstanceComboBoxUI;
38:
39: /**
40: * Sample core implementation of {@link ComboPopupPrototypeCallback} interface
41: * that returns the widest combo entry. This class is part of officially
42: * supported API.
43: *
44: * @author Kirill Grouchnikov
45: */
46: public class WidestComboPopupPrototype implements
47: ComboPopupPrototypeCallback {
48: /*
49: * (non-Javadoc)
50: *
51: * @see org.jvnet.substance.combo.ComboPopupPrototypeCallback#getPopupPrototypeDisplayValue(javax.swing.JComboBox)
52: */
53: public Object getPopupPrototypeDisplayValue(JComboBox jc) {
54: int maxWidth = -1;
55: Object prototype = null;
56: JList list = ((SubstanceComboBoxUI) jc.getUI()).getPopup()
57: .getList();
58: for (int i = 0; i < jc.getModel().getSize(); i++) {
59: Object elem = jc.getModel().getElementAt(i);
60: Component renderer = jc.getRenderer()
61: .getListCellRendererComponent(list, elem, i, false,
62: false);
63: if (renderer != null) {
64: int rWidth = renderer.getPreferredSize().width;
65: if (rWidth > maxWidth) {
66: maxWidth = rWidth;
67: prototype = elem;
68: }
69: }
70: }
71:
72: return prototype;
73: }
74: }
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