| /******************************************************************************* |
| * 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; |
| } |
| |
| 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); |
| } |
| |
| public Object nativeToJava(TransferData transferData) { |
| if (isSupportedType(transferData)) { |
| byte[] buffer = (byte[]) super.nativeToJava(transferData); |
| if (buffer == null) |
| return null; |
| return byteArrayToJava(buffer); |
| } |
| return null; |
| } |
| |
| protected String[] getTypeNames() { |
| return new String[] { MYTYPENAME }; |
| } |
| |
| protected int[] getTypeIds() { |
| return new int[] { MYTYPEID }; |
| } |
| |
| boolean checkMyType(Object object) { |
| return object != null && object instanceof MyType; |
| } |
| |
| 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; |
| } |
| |
| protected String[] getTypeNames() { |
| return new String[] { MYTYPE2NAME }; |
| } |
| |
| protected int[] getTypeIds() { |
| return new int[] { MYTYPE2ID }; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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() { |
| 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() { |
| 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 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() { |
| 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) { |
| 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(); |
| } |
| } |