content: /*
   * Created on Mar 28, 2008
   * 
   * 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.
   * 
   * Copyright @2008-2013 the original author or authors.
   */
  package org.fest.swing.input;
  
  import static java.awt.event.MouseEvent.MOUSE_MOVED;
  import static java.awt.event.MouseEvent.MOUSE_PRESSED;
  import static java.awt.event.MouseEvent.MOUSE_RELEASED;
  import static org.fest.reflect.core.Reflection.method;
  
  import java.awt.Component;
  import java.awt.Point;
  import java.awt.dnd.InvalidDnDOperationException;
  import java.awt.event.MouseEvent;
  import java.lang.reflect.InvocationTargetException;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  
  import org.fest.reflect.exception.ReflectionError;
  
  /**
   * Description of a drag/drop operation.
   * 
   * @author Alex Ruiz
   */
  class DragDropInfo {
    private Component source;
    private int x;
    private int y;
  
    void clear() {
      source(null);
    }
  
    void update(@Nonnull MouseEvent event) {
      int mouseEventId = event.getID();
      if (mouseEventId == MOUSE_RELEASED || mouseEventId == MOUSE_MOVED) {
        clear();
        return;
      }
      if (mouseEventId == MOUSE_PRESSED) {
        source(event.getComponent());
        x = event.getX();
        y = event.getY();
      }
    }
  
    @Nullable Component source() {
      return source;
    }
  
    void source(@Nullable Component newSource) {
      source = newSource;
    }
  
    boolean isDragging() {
      return source != null;
    }
  
    @Nonnull Point origin() {
      return new Point(x, y);
    }
  
    void origin(@Nonnull Point origin) {
      x = origin.x;
      y = origin.y;
    }
  
    boolean isNativeDragActive() {
      try {
        Class<?> type = Class.forName("sun.awt.dnd.SunDragSourceContextPeer");
        try {
          method("checkDragDropInProgress").in(type).invoke();
          return false;
        } catch (ReflectionError e) {
          Throwable cause = e.getCause();
          if (!(cause instanceof InvocationTargetException)) {
            return false;
          }
          return (((InvocationTargetException) cause).getTargetException() instanceof InvalidDnDOperationException);
        }
      } catch (Exception ignored) {
        return false;
      }
    }
  }
  