JDK8/Java8源码在线阅读

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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package java.awt.event;

/**
 * An abstract adapter class for receiving mouse motion events.
 * The methods in this class are empty. This class exists as
 * convenience for creating listener objects.
 * <P>
 * Mouse motion events occur when a mouse is moved or dragged.
 * (Many such events will be generated in a normal program.
 * To track clicks and other mouse events, use the MouseAdapter.)
 * <P>
 * Extend this class to create a <code>MouseEvent</code> listener
 * and override the methods for the events of interest. (If you implement the
 * <code>MouseMotionListener</code> interface, you have to define all of
 * the methods in it. This abstract class defines null methods for them
 * all, so you can only have to define methods for events you care about.)
 * <P>
 * Create a listener object using the extended class and then register it with
 * a component using the component's <code>addMouseMotionListener</code>
 * method. When the mouse is moved or dragged, the relevant method in the
 * listener object is invoked and the <code>MouseEvent</code> is passed to it.
 *
 * @author Amy Fowler
 *
 * @see MouseEvent
 * @see MouseMotionListener
 * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html">Tutorial: Writing a Mouse Motion Listener</a>
 *
 * @since 1.1
 */
public abstract class MouseMotionAdapter implements MouseMotionListener {
    /**
     * Invoked when a mouse button is pressed on a component and then
     * dragged.  Mouse drag events will continue to be delivered to
     * the component where the first originated until the mouse button is

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