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.javafx.impl.tree;
27
28 import jakarta.annotation.Nonnull;
29 import javafx.beans.value.ChangeListener;
30 import javafx.beans.value.ObservableValue;
31 import javafx.scene.control.TreeItem;
32 import javafx.scene.control.TreeView;
33 import it.tidalwave.ui.core.role.PresentationModel;
34 import lombok.extern.slf4j.Slf4j;
35
36 /***************************************************************************************************************************************************************
37 *
38 * This listener calls {@link PresentationModel#dispose()} on instances that have been detached from a {@link TreeView}.
39 *
40 * @author Fabrizio Giudici
41 *
42 **************************************************************************************************************************************************************/
43 @Slf4j
44 public class ObsoletePresentationModelDisposer implements ChangeListener<TreeItem<PresentationModel>>
45 {
46 @Override
47 public void changed (@Nonnull final ObservableValue<? extends TreeItem<PresentationModel>> ov,
48 final TreeItem<PresentationModel> oldTreeItem,
49 final TreeItem<PresentationModel> newTreeItem)
50 {
51 if (oldTreeItem != null)
52 {
53 disposeRecursively(oldTreeItem);
54 }
55 }
56
57 private void disposeRecursively (@Nonnull final TreeItem<PresentationModel> treeItem)
58 {
59 treeItem.getValue().dispose();
60 treeItem.setValue(null);
61
62 for (final var childTreeItem : treeItem.getChildren())
63 {
64 disposeRecursively(childTreeItem);
65 }
66 }
67 }