/*******************************************************************************
* Copyright (c) 2000, 2005 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: define data transfer types that subclass each
* other
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.1
*/
import java.io.*;
import org.eclipse.swt.*;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet171 {
/*
* The data being transferred is an <bold>array of type MyType</bold> where
* MyType is define as:
*/
static class MyType {
String fileName;
long fileLength;
long lastModified;
}
static class MyTransfer extends ByteArrayTransfer {
private static final String MYTYPENAME = "MytypeTransfer";
private static final int MYTYPEID = registerType(MYTYPENAME);
private static MyTransfer _instance = new MyTransfer();
public static Transfer getInstance() {
return _instance;
}
byte[] javaToByteArray(Object object) {
MyType data = (MyType) object;
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream writeOut = new DataOutputStream(out);
byte[] buffer = data.fileName.getBytes();
writeOut.writeInt(buffer.length);
writeOut.write(buffer);
writeOut.writeLong(data.fileLength);
writeOut.writeLong(data.lastModified);
buffer = out.toByteArray();
writeOut.close();
return buffer;
} catch (IOException e) {
}
return null;
}
Object byteArrayToJava(byte[] bytes) {
MyType data = new MyType();
try {
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
DataInputStream readIn = new DataInputStream(in);
int size = readIn.readInt();
byte[] buffer = new byte[size];
readIn.read(buffer);
data.fileName = new String(buffer);
data.fileLength = readIn.readLong();
data.lastModified = readIn.readLong();
readIn.close();
} catch (IOException ex) {
return null;
}
return data;
}
@Override
public void javaToNative(Object object, TransferData transferData) {
if (!checkMyType(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
byte[] buffer = javaToByteArray(object);
super.javaToNative(buffer, transferData);
}
@Override
public Object nativeToJava(TransferData transferData) {
if (isSupportedType(transferData)) {
byte[] buffer = (byte[]) super.nativeToJava(transferData);
if (buffer == null)
return null;
return byteArrayToJava(buffer);
}
return null;
}
@Override
protected String[] getTypeNames() {
return new String[] { MYTYPENAME };
}
@Override
protected int[] getTypeIds() {
return new int[] { MYTYPEID };
}
boolean checkMyType(Object object) {
return object != null && object instanceof MyType;
}
@Override
protected boolean validate(Object object) {
return checkMyType(object);
}
}
/*
* The data being transferred is an <bold>array of type MyType2</bold>
* where MyType2 is define as:
*/
static class MyType2 extends MyType {
String version;
}
static class MyTransfer2 extends MyTransfer {
private static final String MYTYPE2NAME = "Mytype2Transfer";
private static final int MYTYPE2ID = registerType(MYTYPE2NAME);
private static MyTransfer _instance = new MyTransfer2();
public static Transfer getInstance() {
return _instance;
}
@Override
protected String[] getTypeNames() {
return new String[] { MYTYPE2NAME };
}
@Override
protected int[] getTypeIds() {
return new int[] { MYTYPE2ID };
}
@Override
byte[] javaToByteArray(Object object) {
MyType2 data = (MyType2) object;
try {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DataOutputStream writeOut = new DataOutputStream(out);
byte[] buffer = data.fileName.getBytes();
writeOut.writeInt(buffer.length);
writeOut.write(buffer);
writeOut.writeLong(data.fileLength);
writeOut.writeLong(data.lastModified);
buffer = data.version.getBytes();
writeOut.writeInt(buffer.length);
writeOut.write(buffer);
buffer = out.toByteArray();
writeOut.close();
return buffer;
} catch (IOException e) {
}
return null;
}
@Override
Object byteArrayToJava(byte[] bytes) {
MyType2 data = new MyType2();
try {
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
DataInputStream readIn = new DataInputStream(in);
int size = readIn.readInt();
byte[] buffer = new byte[size];
readIn.read(buffer);
data.fileName = new String(buffer);
data.fileLength = readIn.readLong();
data.lastModified = readIn.readLong();
size = readIn.readInt();
buffer = new byte[size];
readIn.read(buffer);
data.version = new String(buffer);
readIn.close();
} catch (IOException ex) {
return null;
}
return data;
}
@Override
public void javaToNative(Object object, TransferData transferData) {
if (!checkMyType2(object)) {
DND.error(DND.ERROR_INVALID_DATA);
}
super.javaToNative(object, transferData);
}
boolean checkMyType2(Object object) {
if (!checkMyType(object))
return false;
return object != null && object instanceof MyType2;
}
@Override
protected boolean validate(Object object) {
return checkMyType2(object);
}
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Label label1 = new Label(shell, SWT.BORDER | SWT.WRAP);
label1.setText("Drag Source for MyData and MyData2");
final Label label2 = new Label(shell, SWT.BORDER | SWT.WRAP);
label2.setText("Drop Target for MyData");
final Label label3 = new Label(shell, SWT.BORDER | SWT.WRAP);
label3.setText("Drop Target for MyData2");
DragSource source = new DragSource(label1, DND.DROP_COPY);
source.setTransfer(new Transfer[] { MyTransfer.getInstance(),
MyTransfer2.getInstance() });
source.addDragListener(new DragSourceAdapter() {
@Override
public void dragSetData(DragSourceEvent event) {
MyType2 myType = new MyType2();
myType.fileName = "abc.txt";
myType.fileLength = 1000;
myType.lastModified = 12312313;
myType.version = "version 2";
event.data = myType;
}
});
DropTarget targetMyType = new DropTarget(label2, DND.DROP_COPY | DND.DROP_DEFAULT);
targetMyType.setTransfer(new Transfer[] { MyTransfer.getInstance() });
targetMyType.addDropListener(new DropTargetAdapter() {
@Override
public void dragEnter(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
@Override
public void dragOperationChanged(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
@Override
public void drop(DropTargetEvent event) {
if (event.data != null) {
MyType myType = (MyType) event.data;
if (myType != null) {
String string = "MyType: " + myType.fileName;
label2.setText(string);
}
}
}
});
DropTarget targetMyType2 = new DropTarget(label3, DND.DROP_COPY | DND.DROP_DEFAULT);
targetMyType2.setTransfer(new Transfer[] { MyTransfer2.getInstance() });
targetMyType2.addDropListener(new DropTargetAdapter() {
@Override
public void dragEnter(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
@Override
public void dragOperationChanged(DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT)
event.detail = DND.DROP_COPY;
}
@Override
public void drop(DropTargetEvent event) {
if (event.data != null) {
MyType2 myType = (MyType2) event.data;
if (myType != null) {
String string = "MyType2: " + myType.fileName + ":"
+ myType.version;
label3.setText(string);
}
}
}
});
shell.setSize(300, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}