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/*******************************************************************************
* Copyright (c) 2000, 2004 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 my own data transfer type
*
* 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 Snippet79 {
/* 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 = "name_for_my_type";
private static final int MYTYPEID = registerType (MYTYPENAME);
private static MyTransfer _instance = new MyTransfer ();
public static MyTransfer getInstance () {
return _instance;
}
public void javaToNative (Object object, TransferData transferData) {
if (!checkMyType(object) || !isSupportedType (transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
MyType [] myTypes = (MyType []) 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);
for (int i = 0, length = myTypes.length; i < length; i++) {
byte [] buffer = myTypes [i].fileName.getBytes ();
writeOut.writeInt (buffer.length);
writeOut.write (buffer);
writeOut.writeLong (myTypes [i].fileLength);
writeOut.writeLong (myTypes [i].lastModified);
}
byte [] buffer = out.toByteArray ();
writeOut.close ();
super.javaToNative (buffer, transferData);
}
catch (IOException e) {}
}
public Object nativeToJava (TransferData transferData) {
if (isSupportedType (transferData)) {
byte [] buffer = (byte []) super.nativeToJava (transferData);
if (buffer == null) return null;
MyType [] myData = new MyType [0];
try {
ByteArrayInputStream in = new ByteArrayInputStream (buffer);
DataInputStream readIn = new DataInputStream (in);
while (readIn.available () > 20) {
MyType datum = new MyType ();
int size = readIn.readInt ();
byte [] name = new byte [size];
readIn.read (name);
datum.fileName = new String (name);
datum.fileLength = readIn.readLong ();
datum.lastModified = readIn.readLong ();
MyType [] newMyData = new MyType [myData.length + 1];
System.arraycopy (myData, 0, newMyData, 0, myData.length);
newMyData [myData.length] = datum;
myData = newMyData;
}
readIn.close ();
}
catch (IOException ex) {
return null;
}
return myData;
}
return null;
}
protected String [] getTypeNames () {
return new String [] {MYTYPENAME};
}
protected int [] getTypeIds () {
return new int [] {MYTYPEID};
}
boolean checkMyType(Object object) {
if (object == null ||
!(object instanceof MyType[]) ||
((MyType[])object).length == 0) {
return false;
}
MyType[] myTypes = (MyType[])object;
for (int i = 0; i < myTypes.length; i++) {
if (myTypes[i] == null ||
myTypes[i].fileName == null ||
myTypes[i].fileName.length() == 0) {
return false;
}
}
return true;
}
protected boolean validate(Object object) {
return checkMyType(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[]");
final Label label2 = new Label (shell, SWT.BORDER | SWT.WRAP);
label2.setText ("Drop Target for MyData[]");
DragSource source = new DragSource (label1, DND.DROP_COPY);
source.setTransfer (new Transfer [] {MyTransfer.getInstance ()});
source.addDragListener (new DragSourceAdapter () {
public void dragSetData (DragSourceEvent event) {
MyType myType1 = new MyType ();
myType1.fileName = "C:\\abc.txt";
myType1.fileLength = 1000;
myType1.lastModified = 12312313;
MyType myType2 = new MyType ();
myType2.fileName = "C:\\xyz.txt";
myType2.fileLength = 500;
myType2.lastModified = 12312323;
event.data = new MyType [] {myType1, myType2};
}
});
DropTarget target = new DropTarget (label2, DND.DROP_COPY | DND.DROP_DEFAULT);
target.setTransfer (new Transfer [] {MyTransfer.getInstance ()});
target.addDropListener (new DropTargetAdapter () {
public void dragEnter (DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT) {
event.detail = DND.DROP_COPY;
}
}
public void dragOperationChanged (DropTargetEvent event) {
if (event.detail == DND.DROP_DEFAULT) {
event.detail = DND.DROP_COPY;
}
}
public void drop (DropTargetEvent event) {
if (event.data != null) {
MyType [] myTypes = (MyType []) event.data;
if (myTypes != null) {
String string = "";
for (int i = 0; i < myTypes.length; i++) {
string += myTypes [i].fileName + " ";
}
label2.setText (string);
}
}
}
});
shell.setSize (200, 200);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
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