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JPPF, the open source grid computing solution
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/*
 * JPPF.
 * Copyright (C) 2005-2015 JPPF Team.
 * http://www.jppf.org
 *
 * 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 org.jppf.ui.actions;

import javax.swing.event.*;
import javax.swing.tree.*;

import org.jppf.ui.treetable.JTreeTable;

/**
 * Abstract implementation of the ActionManager interface for JTreeTable components.
 * @author Laurent Cohen
 */
public class JTreeTableActionHandler extends AbstractActionHandler {
  /**
   * The JTreeTable whose actions are managed.
   */
  protected JTreeTable treeTable = null;

  /**
   * Initialize this action manager with the specified JTreeTable component.
   * @param treeTable the JTreeTable whose actions are managed.
   */
  public JTreeTableActionHandler(final JTreeTable treeTable) {
    this(treeTable, true);
  }

  /**
   * Initialize this action manager with the specified JTreeTable component.
   * @param treeTable the JTreeTable whose actions are managed.
   * @param useListener if true then register a selection listener on the tree table to handle action states updates.
   */
  public JTreeTableActionHandler(final JTreeTable treeTable, final boolean useListener) {
    this.treeTable = treeTable;
    if (useListener) registerSelectionListener();
  }

  /**
   * Register a selection listener on the tree table to handle action states updates.
   */
  private void registerSelectionListener() {
    treeTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
      @Override
      public void valueChanged(final ListSelectionEvent e) {
        if (!e.getValueIsAdjusting()) {
          synchronized(JTreeTableActionHandler.this) {
            computeSelectedElements();
            updateActions();
          }
        }
      }
    });
  }

  /**
   * Compute the list of elements selected in the component.
   */
  protected synchronized void computeSelectedElements() {
    selectedElements.clear();
    int[] rows = treeTable.getSelectedRows();
    if ((rows == null) || (rows.length <= 0)) return;
    for (int n: rows) {
      TreePath path = treeTable.getTree().getPathForRow(n);
      if (path == null) continue;
      DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
      selectedElements.add(node.getUserObject());
    }
  }
}