it.tidalwave.role.ui.javafx.impl.tree.ObsoletePresentationModelDisposer Maven / Gradle / Ivy

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/*
 * *************************************************************************************************************************************************************
 *
 * SteelBlue: DCI User Interfaces
 * http://tidalwave.it/projects/steelblue
 *
 * Copyright (C) 2015 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *************************************************************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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
 * CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and limitations under the License.
 *
 * *************************************************************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/steelblue-src
 * git clone https://github.com/tidalwave-it/steelblue-src
 *
 * *************************************************************************************************************************************************************
 */
package it.tidalwave.role.ui.javafx.impl.tree;

import javax.annotation.Nonnull;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import it.tidalwave.role.ui.PresentationModel;
import lombok.extern.slf4j.Slf4j;

/***************************************************************************************************************************************************************
 *
 * This listener calls {@link PresentationModel#dispose()} on instances that have been detached from a {@link TreeView}.
 *
 * @author  Fabrizio Giudici
 *
 **************************************************************************************************************************************************************/
@Slf4j
public class ObsoletePresentationModelDisposer implements ChangeListener>
  {
    @Override
    public void changed (@Nonnull final ObservableValue> ov,
                         final TreeItem oldTreeItem,
                         final TreeItem newTreeItem)
      {
        if (oldTreeItem != null)
          {
            disposeRecursively(oldTreeItem);
          }
      }

    private void disposeRecursively (@Nonnull final TreeItem treeItem)
      {
        treeItem.getValue().dispose();
        treeItem.setValue(null);

        for (final var childTreeItem : treeItem.getChildren())
          {
            disposeRecursively(childTreeItem);
          }
      }
  }