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src/java.desktop/share/classes/javax/swing/plaf/basic/DragRecognitionSupport.java

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  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 javax.swing.plaf.basic;
  26 
  27 import java.awt.Toolkit;
  28 import java.awt.event.*;
  29 import java.awt.dnd.DragSource;
  30 import javax.swing.*;
  31 import sun.awt.dnd.SunDragSourceContextPeer;
  32 import sun.awt.AppContext;
  33 
  34 /**
  35  * Drag gesture recognition support for classes that have a
  36  * <code>TransferHandler</code>. The gesture for a drag in this class is a mouse
  37  * press followed by movement by <code>DragSource.getDragThreshold()</code>
  38  * pixels. An instance of this class is maintained per AppContext, and the
  39  * public static methods call into the appropriate instance.
  40  *
  41  * @author Shannon Hickey
  42  */
  43 class DragRecognitionSupport {
  44     private int motionThreshold;
  45     private MouseEvent dndArmedEvent;
  46     private JComponent component;
  47 
  48     /**
  49      * This interface allows us to pass in a handler to mouseDragged,
  50      * so that we can be notified immediately before a drag begins.
  51      */
  52     public static interface BeforeDrag {
  53         public void dragStarting(MouseEvent me);
  54     }
  55 
  56     /**
  57      * Returns the DragRecognitionSupport for the caller's AppContext.




  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 javax.swing.plaf.basic;
  26 
  27 import java.awt.Toolkit;
  28 import java.awt.event.*;
  29 import java.awt.dnd.DragSource;
  30 import javax.swing.*;
  31 import sun.awt.dnd.SunDragSourceContextPeer;
  32 import sun.awt.AppContext;
  33 
  34 /**
  35  * Drag gesture recognition support for classes that have a
  36  * {@code TransferHandler}. The gesture for a drag in this class is a mouse
  37  * press followed by movement by {@code DragSource.getDragThreshold()}
  38  * pixels. An instance of this class is maintained per AppContext, and the
  39  * public static methods call into the appropriate instance.
  40  *
  41  * @author Shannon Hickey
  42  */
  43 class DragRecognitionSupport {
  44     private int motionThreshold;
  45     private MouseEvent dndArmedEvent;
  46     private JComponent component;
  47 
  48     /**
  49      * This interface allows us to pass in a handler to mouseDragged,
  50      * so that we can be notified immediately before a drag begins.
  51      */
  52     public static interface BeforeDrag {
  53         public void dragStarting(MouseEvent me);
  54     }
  55 
  56     /**
  57      * Returns the DragRecognitionSupport for the caller's AppContext.


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