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The Java Developers Almanac 1.4Order this book from Amazon. |
e640. Making a Component DraggableThis example demonstrates the code needed to make a component draggable. The object being transferred in this example is a string.public class DraggableComponent extends JComponent implements DragGestureListener, DragSourceListener { DragSource dragSource; public DraggableComponent() { dragSource = new DragSource(); dragSource.createDefaultDragGestureRecognizer( this, DnDConstants.ACTION_COPY_OR_MOVE, this); } public void dragGestureRecognized(DragGestureEvent evt) { Transferable t = new StringSelection("aString"); dragSource.startDrag (evt, DragSource.DefaultCopyDrop, t, this); } public void dragEnter(DragSourceDragEvent evt) { // Called when the user is dragging this drag source and enters // the drop target. } public void dragOver(DragSourceDragEvent evt) { // Called when the user is dragging this drag source and moves // over the drop target. } public void dragExit(DragSourceEvent evt) { // Called when the user is dragging this drag source and leaves // the drop target. } public void dropActionChanged(DragSourceDragEvent evt) { // Called when the user changes the drag action between copy or move. } public void dragDropEnd(DragSourceDropEvent evt) { // Called when the user finishes or cancels the drag operation. } }
e642. Handling a Drop Event © 2002 Addison-Wesley. |