content: /*
   * 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 com.alibaba.compileflow.idea.graph.toolbar.action;
  
  import com.alibaba.compileflow.idea.graph.FlowChartComponent;
  
  import javax.swing.*;
  
  import java.awt.*;
  import java.awt.event.ActionEvent;
  
  /**
   * Revocation operation
   *
   * @author wuxiang
   */
  public class HistoryAction extends AbstractAction {
  
      private boolean undo;
  
      public HistoryAction(boolean undo) {
          this.undo = undo;
      }
  
      @Override
      public void actionPerformed(ActionEvent e) {
  
          FlowChartComponent editor = getEditor(e);
  
          if (editor != null) {
              if (undo) {
                  if (editor.getUndoManager().canUndo()) {
                      editor.getUndoManager().undo();
                  }
              } else {
                  if (editor.getUndoManager().canRedo()) {
                      editor.getUndoManager().redo();
                  }
              }
          }
      }
  
      private static FlowChartComponent getEditor(ActionEvent e) {
          if (e.getSource() instanceof Component) {
              Component component = (Component)e.getSource();
  
              while (component != null
                  && !(component instanceof FlowChartComponent)) {
                  component = component.getParent();
              }
  
              return (FlowChartComponent)component;
          }
  
          return null;
      }
  
  }
  