| /* |
| * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * 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). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * AWT Button is a DragSource and also a transferable object |
| */ |
| |
| import java.awt.*; |
| import java.awt.datatransfer.*; |
| import java.awt.dnd.*; |
| import java.io.*; |
| |
| class DnDSource extends Button implements Transferable, |
| DragGestureListener, |
| DragSourceListener { |
| private DataFlavor df; |
| private transient int dropAction; |
| private final int dragOperation = DnDConstants.ACTION_COPY | DnDConstants.ACTION_MOVE | DnDConstants.ACTION_LINK; |
| DragSource dragSource = new DragSource(); |
| |
| DnDSource(String label) { |
| super(label); |
| setBackground(Color.yellow); |
| setForeground(Color.blue); |
| df = new DataFlavor(DnDSource.class, "DnDSource"); |
| |
| dragSource.createDefaultDragGestureRecognizer( |
| this, |
| dragOperation, |
| this |
| ); |
| dragSource.addDragSourceListener(this); |
| } |
| |
| public void changeCursor( |
| DragSourceContext dsc, |
| int ra |
| ) { |
| java.awt.Cursor c = null; |
| if ((ra & DnDConstants.ACTION_LINK) == DnDConstants.ACTION_LINK) |
| c = DragSource.DefaultLinkDrop; |
| else if ((ra & DnDConstants.ACTION_MOVE) == DnDConstants.ACTION_MOVE) |
| c = MyCursor.MOVE;//DragSource.DefaultMoveDrop; |
| else if ((ra & DnDConstants.ACTION_COPY) == DnDConstants.ACTION_COPY) |
| c = MyCursor.COPY; |
| else |
| c = MyCursor.NO_DROP; |
| dsc.setCursor(c); |
| } |
| |
| /** |
| * a Drag gesture has been recognized |
| */ |
| |
| public void dragGestureRecognized(DragGestureEvent dge) { |
| System.out.println("starting Drag"); |
| try { |
| if (DragSource.isDragImageSupported()) { |
| System.out.println("starting Imaged Drag"); |
| dge.startDrag( |
| null, |
| new ImageGenerator(50, 100, new Color(0xff, 0xff, 0xff, 0x00) ) { |
| @Override public void paint(Graphics gr) { |
| gr.translate(width/2, height/2); |
| ((Graphics2D)gr).setStroke(new BasicStroke(3)); |
| int R = width/4+5; |
| gr.setColor(Color.BLUE); |
| gr.fillRect(-R, -R, 2*R, 2*R); |
| gr.setColor(Color.CYAN); |
| gr.drawRect(-R, -R, 2*R, 2*R); |
| |
| |
| gr.translate(10, 10); |
| R -= 5; |
| gr.setColor(Color.RED); |
| gr.fillOval(-R, -R, 2*R, 2*R); |
| gr.setColor(Color.MAGENTA); |
| gr.drawOval(-R, -R, 2*R, 2*R); |
| } |
| }.getImage(), |
| new Point(15, 40), |
| this, |
| this); |
| } else { |
| dge.startDrag( |
| null, |
| this, |
| this); |
| } |
| } catch (InvalidDnDOperationException e) { |
| e.printStackTrace(); |
| } |
| } |
| |
| /** |
| * as the hotspot enters a platform dependent drop site |
| */ |
| |
| public void dragEnter(DragSourceDragEvent dsde) { |
| System.out.println("[Source] dragEnter"); |
| changeCursor( |
| dsde.getDragSourceContext(), |
| dsde.getUserAction() & dsde.getDropAction() |
| ); |
| } |
| |
| /** |
| * as the hotspot moves over a platform dependent drop site |
| */ |
| public void dragOver(DragSourceDragEvent dsde) { |
| System.out.println("[Source] dragOver"); |
| changeCursor( |
| dsde.getDragSourceContext(), |
| dsde.getUserAction() & dsde.getDropAction() |
| ); |
| dropAction = dsde.getUserAction() & dsde.getDropAction(); |
| System.out.println("dropAction = " + dropAction); |
| } |
| |
| /** |
| * as the hotspot exits a platform dependent drop site |
| */ |
| public void dragExit(DragSourceEvent dse) { |
| System.out.println("[Source] dragExit"); |
| changeCursor( |
| dse.getDragSourceContext(), |
| DnDConstants.ACTION_NONE |
| ); |
| } |
| |
| /** |
| * as the operation changes |
| */ |
| public void dragGestureChanged(DragSourceDragEvent dsde) { |
| System.out.println("[Source] dragGestureChanged"); |
| changeCursor( |
| dsde.getDragSourceContext(), |
| dsde.getUserAction() & dsde.getDropAction() |
| ); |
| dropAction = dsde.getUserAction() & dsde.getDropAction(); |
| System.out.println("dropAction = " + dropAction); |
| } |
| |
| |
| /** |
| * as the operation completes |
| */ |
| public void dragDropEnd(DragSourceDropEvent dsde) { |
| System.out.println("[Source] dragDropEnd"); |
| } |
| |
| public void dropActionChanged(DragSourceDragEvent dsde) { |
| System.out.println("[Source] dropActionChanged"); |
| dropAction = dsde.getUserAction() & dsde.getDropAction(); |
| System.out.println("dropAction = " + dropAction); |
| } |
| |
| public DataFlavor[] getTransferDataFlavors() { |
| return new DataFlavor[]{df}; |
| } |
| |
| public boolean isDataFlavorSupported(DataFlavor sdf) { |
| return df.equals(sdf); |
| } |
| |
| public Object getTransferData(DataFlavor tdf) throws UnsupportedFlavorException, IOException { |
| Object copy = null; |
| if( !df.equals(tdf) ){ |
| throw new UnsupportedFlavorException(tdf); |
| } |
| Container parent = getParent(); |
| switch (dropAction) { |
| case DnDConstants.ACTION_COPY: |
| try { |
| copy = this.clone(); |
| } catch (CloneNotSupportedException e) { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ObjectOutputStream oos = new ObjectOutputStream(baos); |
| |
| oos.writeObject(this); |
| ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); |
| ObjectInputStream ois = new ObjectInputStream(bais); |
| try { |
| copy = ois.readObject(); |
| } catch (ClassNotFoundException cnfe) { |
| // do nothing |
| } |
| } |
| parent.add(this); |
| return copy; |
| |
| case DnDConstants.ACTION_MOVE: |
| synchronized (this) { |
| if (parent != null) { |
| parent.remove(this); |
| Label label = new Label("[empty]"); |
| label.setBackground(Color.cyan); |
| label.setBounds(this.getBounds()); |
| parent.add(label); |
| } |
| } |
| return this; |
| |
| case DnDConstants.ACTION_LINK: |
| return this; |
| |
| default: |
| return null; |
| } |
| |
| } |
| } |
| |