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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.
 */

package com.rapiddweller.common.ui.swing;

import com.rapiddweller.common.ArrayUtil;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JTree;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import java.awt.event.ActionEvent;

/**
 * {@link Action} class which expands or collapses nodes of a {@link JTree}.
 * Created: 23.08.2012 07:47:04
 *
 * @author Volker Bergmann
 * @since 0.5.18
 */
@SuppressWarnings("serial")
public class ExpandOrCollapseTreeNodesAction extends AbstractAction {

  private final JTree tree;
  private final boolean expand;
  private final boolean recursive;

  /**
   * Instantiates a new Expand or collapse tree nodes action.
   *
   * @param tree      the tree
   * @param expand    the expand
   * @param recursive the recursive
   */
  public ExpandOrCollapseTreeNodesAction(JTree tree, boolean expand, boolean recursive) {
    super(expand ? "expand" : "collapse");
    putValue(SHORT_DESCRIPTION, (expand ? "Expand tree nodes" : "Collapse tree nodes"));
    this.tree = tree;
    this.expand = expand;
    this.recursive = recursive;
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    tree.cancelEditing();
    TreePath[] selectionPaths = tree.getSelectionPaths();
    if (!ArrayUtil.isEmpty(selectionPaths)) {
      for (TreePath path : selectionPaths) {
        handlePath(path);
      }
    } else {
      handlePath(new TreePath(tree.getModel().getRoot()));
    }
  }

  private void handlePath(TreePath path) {
    Object node = path.getLastPathComponent();
    TreeModel model = tree.getModel();
    if (!model.isLeaf(node)) {
      if (recursive) {
        for (int i = model.getChildCount(node) - 1; i >= 0; i--) {
          handlePath(path.pathByAddingChild(model.getChild(node, i)));
        }
      }
      if (expand) {
        tree.expandPath(path);
      } else {
        tree.collapsePath(path);
      }
    }
  }

}