/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.log4j.lf5.viewer.categoryexplorer;import javax.swing.*;import javax.swing.event.TreeModelEvent;import javax.swing.tree.TreePath;import java.awt.event.MouseEvent;/** * CategoryExplorerTree * * @author Michael J. Sikorsky * @author Robert Shaw * @author Brent Sprecher * @author Brad Marlborough */// Contributed by ThoughtWorks Inc.public class CategoryExplorerTree extends JTree {  private static final long serialVersionUID = 8066257446951323576L;  //--------------------------------------------------------------------------  //   Constants:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Protected Variables:  //--------------------------------------------------------------------------  protected CategoryExplorerModel _model;  protected boolean _rootAlreadyExpanded = false;  //--------------------------------------------------------------------------  //   Private Variables:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Constructors:  //--------------------------------------------------------------------------  /**   * Construct a CategoryExplorerTree with a specific model.   */  public CategoryExplorerTree(CategoryExplorerModel model) {    super(model);    _model = model;    init();  }  /**   * Construct a CategoryExplorerTree and create a default CategoryExplorerModel.   */  public CategoryExplorerTree() {    super();    CategoryNode rootNode = new CategoryNode("Categories");    _model = new CategoryExplorerModel(rootNode);    setModel(_model);    init();  }  //--------------------------------------------------------------------------  //   Public Methods:  //--------------------------------------------------------------------------  public CategoryExplorerModel getExplorerModel() {    return (_model);  }  public String getToolTipText(MouseEvent e) {    try {      return super.getToolTipText(e);    } catch (Exception ex) {      return "";    }  }  //--------------------------------------------------------------------------  //   Protected Methods:  //--------------------------------------------------------------------------  protected void init() {    // Put visible lines on the JTree.    putClientProperty("JTree.lineStyle", "Angled");    // Configure the Tree with the appropriate Renderers and Editors.    CategoryNodeRenderer renderer = new CategoryNodeRenderer();    setEditable(true);    setCellRenderer(renderer);    CategoryNodeEditor editor = new CategoryNodeEditor(_model);    setCellEditor(new CategoryImmediateEditor(this,        new CategoryNodeRenderer(),        editor));    setShowsRootHandles(true);    setToolTipText("");    ensureRootExpansion();  }  protected void expandRootNode() {    if (_rootAlreadyExpanded) {      return;    }    _rootAlreadyExpanded = true;    TreePath path = new TreePath(_model.getRootCategoryNode().getPath());    expandPath(path);  }  protected void ensureRootExpansion() {    _model.addTreeModelListener(new TreeModelAdapter() {      public void treeNodesInserted(TreeModelEvent e) {        expandRootNode();      }    });  }  //--------------------------------------------------------------------------  //   Private Methods:  //--------------------------------------------------------------------------  //--------------------------------------------------------------------------  //   Nested Top-Level Classes or Interfaces:  //--------------------------------------------------------------------------}