01: /*
02: * Copyright (c) 2001-2006 JGoodies Karsten Lentzsch. 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 JGoodies Karsten Lentzsch 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:
31: package com.jgoodies.animation.tutorial.component;
32:
33: import java.awt.Color;
34:
35: import com.jgoodies.binding.value.AbstractConverter;
36: import com.jgoodies.binding.value.ValueModel;
37:
38: /**
39: * This implementation of <code>ValueModel</code> converts integers
40: * between 0 and 255 to Color instances that use this integer as alpha value.
41: *
42: * @author Karsten Lentzsch
43: * @version $Revision: 1.3 $
44: *
45: * @see Color
46: */
47:
48: final class AlphaConverter extends AbstractConverter {
49:
50: /**
51: * Constructs an <code>AlphaConverter</code> on the given subject.
52: *
53: * @param subject the underlying <code>ValueModel</code>
54: */
55: AlphaConverter(ValueModel subject) {
56: super (subject);
57: }
58:
59: /**
60: * Converts a Color to the color's alpha value.
61: *
62: * @param subjectValue the subject's Color
63: * @return the color's alpha value
64: * @throws ClassCastException if the subject value is not of type
65: * <code>Color</code>
66: */
67: public Object convertFromSubject(Object subjectValue) {
68: Color color = (Color) subjectValue;
69: return new Integer(color.getAlpha());
70: }
71:
72: /**
73: * Converts an alpha value between 0 and 255 to a Color with that
74: * integer as brightness.
75: *
76: * @param newValue the new alpha value
77: * @throws ClassCastException if the new value is not of type
78: * <code>Integer</code>
79: */
80: public void setValue(Object newValue) {
81: int alpha = ((Integer) newValue).intValue();
82: Color oldColor = (Color) subject.getValue();
83: subject.setValue(new Color(oldColor.getRed(), oldColor
84: .getGreen(), oldColor.getBlue(), alpha));
85: }
86: }
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