draggablecomponent.html

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<TITLE>Making a Component Draggable
(Java Developers Almanac Example)
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  <h3>
    e644.  
    Making a Component Draggable</h3>

This example demonstrates the code needed to make a component 
draggable. The object being transferred in this example is a string.


<pre>
    public class <font color="#0066ff"><i>DraggableComponent</i></font> extends JComponent implements DragGestureListener, DragSourceListener {
        DragSource dragSource;
    
        public <font color="#0066ff"><i>DraggableComponent</i></font>() {
            dragSource = new DragSource();
            dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY_OR_MOVE, this);
        }
        public void dragGestureRecognized(DragGestureEvent evt) {
            Transferable t = new StringSelection(<font color="#0066ff"><i>"aString"</i></font>);
            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.
        }
    }
</pre>
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            &nbsp;Related Examples
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e645. <a class="eglink" href="DropTargetComponent.html?l=rel">
    Making a Component a Drop Target
</a>
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e646. <a class="eglink" href="DropEvent.html?l=rel">
    Handling a Drop Event
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