1 /*
2 * *************************************************************************************************************************************************************
3 *
4 * SteelBlue: DCI User Interfaces
5 * http://tidalwave.it/projects/steelblue
6 *
7 * Copyright (C) 2015 - 2025 by Tidalwave s.a.s. (http://tidalwave.it)
8 *
9 * *************************************************************************************************************************************************************
10 *
11 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
17 * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18 *
19 * *************************************************************************************************************************************************************
20 *
21 * git clone https://bitbucket.org/tidalwave/steelblue-src
22 * git clone https://github.com/tidalwave-it/steelblue-src
23 *
24 * *************************************************************************************************************************************************************
25 */
26 package it.tidalwave.ui.core.function;
27
28 import jakarta.annotation.Nonnull;
29 import java.beans.PropertyChangeEvent;
30 import java.beans.PropertyChangeListener;
31 import it.tidalwave.ui.core.ChangingSource;
32
33 /***************************************************************************************************************************************************************
34 *
35 * @since 2.0-ALPHA-1
36 * @author Fabrizio Giudici
37 *
38 **************************************************************************************************************************************************************/
39 @SuppressWarnings("this-escape")
40 public abstract class BooleanBoundFunctionSupport extends BoundFunctionSupport<Boolean, Boolean>
41 {
42 protected final ChangingSource<Boolean>[] sources;
43
44 private boolean oldValue;
45
46 private boolean newValue;
47
48 private final PropertyChangeListener pcl = new PropertyChangeListener()
49 {
50 @Override
51 public void propertyChange (@Nonnull final PropertyChangeEvent event)
52 {
53 newValue = function();
54 fireValueChanged(oldValue, newValue);
55 oldValue = newValue;
56 }
57 };
58
59 public BooleanBoundFunctionSupport (@Nonnull final ChangingSource<Boolean> ... sources)
60 {
61 this.sources = sources;
62
63 for (final var source : sources)
64 {
65 source.addPropertyChangeListener(pcl);
66 }
67
68 oldValue = function();
69 }
70
71 protected abstract boolean function();
72
73 @Override @Nonnull
74 public final Boolean get()
75 {
76 return newValue;
77 }
78 }