Transfer type to transfer SWT ImageData objects.
/**
* Transfer type to transfer SWT ImageData objects.
*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.ByteArrayTransfer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
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)) {
DND.error(DND.ERROR_INVALID_DATA);
}
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();
loader.data = new ImageData[] { imdata };
loader.save(writeOut, SWT.IMAGE_BMP);
writeOut.close();
byte[] buffer = out.toByteArray();
super.javaToNative(buffer, transferData);
out.close();
} 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);
readIn.close();
} 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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