| /******************************************************************************* |
| * Copyright (c) 2000, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Drag and Drop example snippet: drag and drop an object with a |
| * custom data transfer type from SWT to AWT/Swing |
| * |
| * Note that JRE 1.6 or newer is required on Linux. |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| */ |
| import java.awt.Frame; |
| import java.awt.datatransfer.*; |
| import java.awt.dnd.DnDConstants; |
| import java.awt.dnd.DropTarget; |
| import java.awt.dnd.DropTargetAdapter; |
| import java.awt.dnd.DropTargetDropEvent; |
| import java.awt.dnd.DropTargetListener; |
| import java.io.*; |
| import java.util.Date; |
| import javax.swing.JLabel; |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.awt.*; |
| import org.eclipse.swt.dnd.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet319 { |
| |
| /* The data flavor must be MIME type-like */ |
| static final String MIME_TYPE = "custom/myType"; // $NON-NLS-1$ |
| |
| /* The object being transferred is defined as: */ |
| static class MyType { |
| String name; |
| long time; |
| } |
| |
| public static void main(String[] args) { |
| new Snippet319().go(); |
| } |
| |
| public void go() { |
| Display display = new Display(); |
| Shell shell = new Shell(display); |
| shell.setBounds(10,10,600,200); |
| |
| /* Create SWT controls and add drag source */ |
| final Label swtLabel = new Label(shell, SWT.BORDER); |
| swtLabel.setBounds(10,10,580,50); |
| swtLabel.setText("SWT drag source"); |
| DragSource dragSource = new DragSource(swtLabel, DND.DROP_COPY); |
| Transfer[] transfers = new Transfer[] {new MyTypeTransfer()}; |
| dragSource.setTransfer(transfers); |
| dragSource.addDragListener(new DragSourceAdapter() { |
| @Override |
| public void dragSetData(DragSourceEvent event) { |
| MyType object = new MyType(); |
| object.name = "content dragged from SWT"; |
| object.time = System.currentTimeMillis(); |
| event.data = object; |
| } |
| }); |
| |
| /* Create AWT/Swing controls */ |
| Composite embeddedComposite = new Composite(shell, SWT.EMBEDDED); |
| embeddedComposite.setBounds(10, 100, 580, 50); |
| embeddedComposite.setLayout(new FillLayout()); |
| Frame frame = SWT_AWT.new_Frame(embeddedComposite); |
| final JLabel jLabel = new JLabel("AWT/Swing drop target"); |
| frame.add(jLabel); |
| |
| /* Register the custom data flavour */ |
| final DataFlavor flavor = new DataFlavor(MIME_TYPE, "MyType custom flavor"); |
| /* |
| * Note that according to jre/lib/flavormap.properties, the preferred way to |
| * augment the default system flavor map is to specify the AWT.DnD.flavorMapFileURL |
| * property in an awt.properties file. |
| * |
| * This snippet uses the alternate approach below in order to provide a simple |
| * stand-alone snippet that demonstrates the functionality. This implementation |
| * works well, but if the instanceof check below fails for some reason when used |
| * in a different context then the drop will not be accepted. |
| */ |
| FlavorMap map = SystemFlavorMap.getDefaultFlavorMap(); |
| if (map instanceof SystemFlavorMap) { |
| SystemFlavorMap systemMap = (SystemFlavorMap)map; |
| systemMap.addFlavorForUnencodedNative(MIME_TYPE, flavor); |
| } |
| |
| /* add drop target */ |
| DropTargetListener dropTargetListener = new DropTargetAdapter() { |
| @Override |
| public void drop(DropTargetDropEvent dropTargetDropEvent) { |
| try { |
| dropTargetDropEvent.acceptDrop(DnDConstants.ACTION_COPY); |
| ByteArrayInputStream inStream = (ByteArrayInputStream)dropTargetDropEvent.getTransferable().getTransferData(flavor); |
| int available = inStream.available(); |
| byte[] bytes = new byte[available]; |
| inStream.read(bytes); |
| MyType object = restoreFromByteArray(bytes); |
| String string = object.name + ": " + new Date(object.time).toString(); |
| jLabel.setText(string); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| }; |
| new DropTarget(jLabel, dropTargetListener); |
| |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| |
| |
| /* SWT custom data transfer implementation */ |
| |
| class MyTypeTransfer extends ByteArrayTransfer { |
| |
| final int MIME_TYPE_ID = registerType(MIME_TYPE); |
| |
| @Override |
| protected int[] getTypeIds() { |
| return new int[] {MIME_TYPE_ID}; |
| } |
| |
| @Override |
| protected String[] getTypeNames() { |
| return new String[] {MIME_TYPE}; |
| } |
| |
| @Override |
| public void javaToNative(Object object, TransferData transferData) { |
| if (!checkMyType(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| MyType myType = (MyType)object; |
| byte[] bytes = convertToByteArray(myType); |
| if (bytes != null) { |
| super.javaToNative(bytes, transferData); |
| } |
| } |
| |
| @Override |
| public Object nativeToJava(TransferData transferData) { |
| if (!isSupportedType(transferData)) return null; |
| byte[] bytes = (byte[])super.nativeToJava(transferData); |
| return bytes == null ? null : restoreFromByteArray(bytes); |
| } |
| |
| boolean checkMyType(Object object) { |
| if (object == null) return false; |
| MyType myType = (MyType)object; |
| return myType != null && myType.name != null && myType.name.length() > 0 && myType.time > 0; |
| } |
| |
| @Override |
| protected boolean validate(Object object) { |
| return checkMyType(object); |
| } |
| } |
| |
| |
| /* shared methods for converting instances of MyType <-> byte[] */ |
| |
| static byte[] convertToByteArray(MyType type) { |
| DataOutputStream dataOutStream = null; |
| try { |
| ByteArrayOutputStream byteOutStream = new ByteArrayOutputStream(); |
| dataOutStream = new DataOutputStream(byteOutStream); |
| byte[] bytes = type.name.getBytes(); |
| dataOutStream.writeInt(bytes.length); |
| dataOutStream.write(bytes); |
| dataOutStream.writeLong(type.time); |
| return byteOutStream.toByteArray(); |
| } catch (IOException e) { |
| return null; |
| } finally { |
| if (dataOutStream != null) { |
| try { |
| dataOutStream.close(); |
| } catch (IOException e) {} |
| } |
| } |
| } |
| |
| static MyType restoreFromByteArray(byte[] bytes) { |
| DataInputStream dataInStream = null; |
| try { |
| ByteArrayInputStream byteInStream = new ByteArrayInputStream(bytes); |
| dataInStream = new DataInputStream(byteInStream); |
| int size = dataInStream.readInt(); |
| byte[] name = new byte[size]; |
| dataInStream.read(name); |
| MyType result = new MyType(); |
| result.name = new String(name); |
| result.time = dataInStream.readLong(); |
| return result; |
| } catch (IOException ex) { |
| return null; |
| } finally { |
| if (dataInStream != null) { |
| try { |
| dataInStream.close(); |
| } catch (IOException e) {} |
| } |
| } |
| } |
| |
| } |