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src/java.desktop/share/classes/java/awt/dnd/DnDEventMulticaster.java

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  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.awt.dnd;
  26 
  27 import java.awt.AWTEventMulticaster;
  28 import java.io.ObjectOutputStream;
  29 import java.io.IOException;
  30 import java.util.EventListener;
  31 
  32 
  33 /**
  34  * A class extends <code>AWTEventMulticaster</code> to implement efficient and
  35  * thread-safe multi-cast event dispatching for the drag-and-drop events defined
  36  * in the java.awt.dnd package.
  37  *
  38  * @since       1.4
  39  * @see AWTEventMulticaster
  40  */
  41 
  42 class DnDEventMulticaster extends AWTEventMulticaster
  43     implements DragSourceListener, DragSourceMotionListener {
  44 
  45     /**
  46      * Creates an event multicaster instance which chains listener-a
  47      * with listener-b. Input parameters <code>a</code> and <code>b</code>
  48      * should not be <code>null</code>, though implementations may vary in
  49      * choosing whether or not to throw <code>NullPointerException</code>
  50      * in that case.
  51      *
  52      * @param a listener-a
  53      * @param b listener-b
  54      */
  55     protected DnDEventMulticaster(EventListener a, EventListener b) {
  56         super(a,b);
  57     }
  58 
  59     /**
  60      * Handles the <code>DragSourceDragEvent</code> by invoking
  61      * <code>dragEnter</code> on listener-a and listener-b.
  62      *
  63      * @param dsde the <code>DragSourceDragEvent</code>
  64      */
  65     public void dragEnter(DragSourceDragEvent dsde) {
  66         ((DragSourceListener)a).dragEnter(dsde);
  67         ((DragSourceListener)b).dragEnter(dsde);
  68     }
  69 
  70     /**
  71      * Handles the <code>DragSourceDragEvent</code> by invoking
  72      * <code>dragOver</code> on listener-a and listener-b.
  73      *
  74      * @param dsde the <code>DragSourceDragEvent</code>
  75      */
  76     public void dragOver(DragSourceDragEvent dsde) {
  77         ((DragSourceListener)a).dragOver(dsde);
  78         ((DragSourceListener)b).dragOver(dsde);
  79     }
  80 
  81     /**
  82      * Handles the <code>DragSourceDragEvent</code> by invoking
  83      * <code>dropActionChanged</code> on listener-a and listener-b.
  84      *
  85      * @param dsde the <code>DragSourceDragEvent</code>
  86      */
  87     public void dropActionChanged(DragSourceDragEvent dsde) {
  88         ((DragSourceListener)a).dropActionChanged(dsde);
  89         ((DragSourceListener)b).dropActionChanged(dsde);
  90     }
  91 
  92     /**
  93      * Handles the <code>DragSourceEvent</code> by invoking
  94      * <code>dragExit</code> on listener-a and listener-b.
  95      *
  96      * @param dse the <code>DragSourceEvent</code>
  97      */
  98     public void dragExit(DragSourceEvent dse) {
  99         ((DragSourceListener)a).dragExit(dse);
 100         ((DragSourceListener)b).dragExit(dse);
 101     }
 102 
 103     /**
 104      * Handles the <code>DragSourceDropEvent</code> by invoking
 105      * <code>dragDropEnd</code> on listener-a and listener-b.
 106      *
 107      * @param dsde the <code>DragSourceDropEvent</code>
 108      */
 109     public void dragDropEnd(DragSourceDropEvent dsde) {
 110         ((DragSourceListener)a).dragDropEnd(dsde);
 111         ((DragSourceListener)b).dragDropEnd(dsde);
 112     }
 113 
 114     /**
 115      * Handles the <code>DragSourceDragEvent</code> by invoking
 116      * <code>dragMouseMoved</code> on listener-a and listener-b.
 117      *
 118      * @param dsde the <code>DragSourceDragEvent</code>
 119      */
 120     public void dragMouseMoved(DragSourceDragEvent dsde) {
 121         ((DragSourceMotionListener)a).dragMouseMoved(dsde);
 122         ((DragSourceMotionListener)b).dragMouseMoved(dsde);
 123     }
 124 
 125     /**
 126      * Adds drag-source-listener-a with drag-source-listener-b and
 127      * returns the resulting multicast listener.
 128      *
 129      * @param a drag-source-listener-a
 130      * @param b drag-source-listener-b
 131      */
 132     public static DragSourceListener add(DragSourceListener a,
 133                                          DragSourceListener b) {
 134         return (DragSourceListener)addInternal(a, b);
 135     }
 136 
 137     /**
 138      * Adds drag-source-motion-listener-a with drag-source-motion-listener-b and




  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.awt.dnd;
  26 
  27 import java.awt.AWTEventMulticaster;
  28 import java.io.ObjectOutputStream;
  29 import java.io.IOException;
  30 import java.util.EventListener;
  31 
  32 
  33 /**
  34  * A class extends {@code AWTEventMulticaster} to implement efficient and
  35  * thread-safe multi-cast event dispatching for the drag-and-drop events defined
  36  * in the java.awt.dnd package.
  37  *
  38  * @since       1.4
  39  * @see AWTEventMulticaster
  40  */
  41 
  42 class DnDEventMulticaster extends AWTEventMulticaster
  43     implements DragSourceListener, DragSourceMotionListener {
  44 
  45     /**
  46      * Creates an event multicaster instance which chains listener-a
  47      * with listener-b. Input parameters {@code a} and {@code b}
  48      * should not be {@code null}, though implementations may vary in
  49      * choosing whether or not to throw {@code NullPointerException}
  50      * in that case.
  51      *
  52      * @param a listener-a
  53      * @param b listener-b
  54      */
  55     protected DnDEventMulticaster(EventListener a, EventListener b) {
  56         super(a,b);
  57     }
  58 
  59     /**
  60      * Handles the {@code DragSourceDragEvent} by invoking
  61      * {@code dragEnter} on listener-a and listener-b.
  62      *
  63      * @param dsde the {@code DragSourceDragEvent}
  64      */
  65     public void dragEnter(DragSourceDragEvent dsde) {
  66         ((DragSourceListener)a).dragEnter(dsde);
  67         ((DragSourceListener)b).dragEnter(dsde);
  68     }
  69 
  70     /**
  71      * Handles the {@code DragSourceDragEvent} by invoking
  72      * {@code dragOver} on listener-a and listener-b.
  73      *
  74      * @param dsde the {@code DragSourceDragEvent}
  75      */
  76     public void dragOver(DragSourceDragEvent dsde) {
  77         ((DragSourceListener)a).dragOver(dsde);
  78         ((DragSourceListener)b).dragOver(dsde);
  79     }
  80 
  81     /**
  82      * Handles the {@code DragSourceDragEvent} by invoking
  83      * {@code dropActionChanged} on listener-a and listener-b.
  84      *
  85      * @param dsde the {@code DragSourceDragEvent}
  86      */
  87     public void dropActionChanged(DragSourceDragEvent dsde) {
  88         ((DragSourceListener)a).dropActionChanged(dsde);
  89         ((DragSourceListener)b).dropActionChanged(dsde);
  90     }
  91 
  92     /**
  93      * Handles the {@code DragSourceEvent} by invoking
  94      * {@code dragExit} on listener-a and listener-b.
  95      *
  96      * @param dse the {@code DragSourceEvent}
  97      */
  98     public void dragExit(DragSourceEvent dse) {
  99         ((DragSourceListener)a).dragExit(dse);
 100         ((DragSourceListener)b).dragExit(dse);
 101     }
 102 
 103     /**
 104      * Handles the {@code DragSourceDropEvent} by invoking
 105      * {@code dragDropEnd} on listener-a and listener-b.
 106      *
 107      * @param dsde the {@code DragSourceDropEvent}
 108      */
 109     public void dragDropEnd(DragSourceDropEvent dsde) {
 110         ((DragSourceListener)a).dragDropEnd(dsde);
 111         ((DragSourceListener)b).dragDropEnd(dsde);
 112     }
 113 
 114     /**
 115      * Handles the {@code DragSourceDragEvent} by invoking
 116      * {@code dragMouseMoved} on listener-a and listener-b.
 117      *
 118      * @param dsde the {@code DragSourceDragEvent}
 119      */
 120     public void dragMouseMoved(DragSourceDragEvent dsde) {
 121         ((DragSourceMotionListener)a).dragMouseMoved(dsde);
 122         ((DragSourceMotionListener)b).dragMouseMoved(dsde);
 123     }
 124 
 125     /**
 126      * Adds drag-source-listener-a with drag-source-listener-b and
 127      * returns the resulting multicast listener.
 128      *
 129      * @param a drag-source-listener-a
 130      * @param b drag-source-listener-b
 131      */
 132     public static DragSourceListener add(DragSourceListener a,
 133                                          DragSourceListener b) {
 134         return (DragSourceListener)addInternal(a, b);
 135     }
 136 
 137     /**
 138      * Adds drag-source-motion-listener-a with drag-source-motion-listener-b and


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