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.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 public abstract class BooleanBoundFunctionSupport extends BoundFunctionSupport<Boolean, Boolean>
40 {
41 protected final ChangingSource<Boolean>[] sources;
42
43 private boolean oldValue;
44
45 private boolean newValue;
46
47 private final PropertyChangeListener pcl = new PropertyChangeListener()
48 {
49 @Override
50 public void propertyChange (@Nonnull final PropertyChangeEvent event)
51 {
52 newValue = function();
53 fireValueChanged(oldValue, newValue);
54 oldValue = newValue;
55 }
56 };
57
58 public BooleanBoundFunctionSupport (@Nonnull final ChangingSource<Boolean> ... sources)
59 {
60 this.sources = sources;
61
62 for (final var source : sources)
63 {
64 source.addPropertyChangeListener(pcl);
65 }
66
67 oldValue = function();
68 }
69
70 protected abstract boolean function();
71
72 @Override @Nonnull
73 public final Boolean get()
74 {
75 return newValue;
76 }
77 }