Transfer type to transfer SWT ImageData objects. : Image « SWT JFace Eclipse « Java

Transfer type to transfer SWT ImageData objects.

 * Transfer type to transfer SWT ImageData objects.


import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TransferData;

public class ImageTransfer extends ByteArrayTransfer {

  private static final String TYPENAME = "imagedata";

  private static final int TYPEID = registerType(TYPENAME);

  private static ImageTransfer _instance = new ImageTransfer();

  public static ImageTransfer getInstance() {
    return _instance;

  public void javaToNative(Object object, TransferData transferData) {
    if (!checkImage(object) || !isSupportedType(transferData)) {
    ImageData imdata = (ImageData) object;
    try {
      // write data to a byte array and then ask super to convert to
      // pMedium
      ByteArrayOutputStream out = new ByteArrayOutputStream();
      DataOutputStream writeOut = new DataOutputStream(out);
      ImageLoader loader = new ImageLoader(); = new ImageData[] { imdata };, SWT.IMAGE_BMP);
      byte[] buffer = out.toByteArray();
      super.javaToNative(buffer, transferData);
    } catch (IOException e) {

  public Object nativeToJava(TransferData transferData) {
    if (!isSupportedType(transferData))
      return null;

    byte[] buffer = (byte[]) super.nativeToJava(transferData);
    if (buffer == null)
      return null;

    ImageData imdata;
    try {
      ByteArrayInputStream in = new ByteArrayInputStream(buffer);
      DataInputStream readIn = new DataInputStream(in);
      imdata = new ImageData(readIn);
    } catch (IOException ex) {
      return null;
    return imdata;

  protected String[] getTypeNames() {
    return new String[] { TYPENAME };

  protected int[] getTypeIds() {
    return new int[] { TYPEID };

  boolean checkImage(Object object) {
    return (object != null && object instanceof ImageData);

  protected boolean validate(Object object) {
    return checkImage(object);


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