| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| import org.eclipse.swt.internal.ole.win32.COM; |
| import org.eclipse.swt.internal.win32.TCHAR; |
| import org.eclipse.swt.internal.ole.win32.STGMEDIUM; |
| import org.eclipse.swt.internal.ole.win32.FORMATETC; |
| import org.eclipse.swt.internal.ole.win32.IDataObject; |
| |
| /** |
| * The class <code>TextTransfer</code> provides a platform specific mechanism |
| * for converting plain text represented as a java <code>String</code> |
| * to a platform specific representation of the data and vice versa. See |
| * <code>Transfer</code> for additional information. |
| * |
| * <p>An example of a java <code>String</code> containing plain text is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * String textData = "Hello World"; |
| * </code></pre> |
| */ |
| public class TextTransfer extends ByteArrayTransfer { |
| |
| private static TextTransfer _instance = new TextTransfer(); |
| private TextTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the TextTransfer class. |
| * |
| * @return the singleton instance of the TextTransfer class |
| */ |
| public static TextTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts plain text |
| * represented by a java <code>String</code> to a platform specific representation. |
| * For additional information see <code>Transfer#javaToNative</code>. |
| * |
| * @param object a java <code>String</code> containing text |
| * @param transferData an empty <code>TransferData</code> object; this |
| * object will be filled in on return with the platform specific format of the data |
| */ |
| public void javaToNative (Object object, TransferData transferData){ |
| if (object == null || !(object instanceof String)) { |
| transferData.result = COM.E_FAIL; |
| return; |
| } |
| |
| if (isSupportedType(transferData)) { |
| TCHAR buffer = new TCHAR(0, (String)object, true); |
| int byteCount = buffer.length() * TCHAR.sizeof; |
| int newPtr = COM.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount); |
| COM.MoveMemory(newPtr, buffer, byteCount); |
| |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.stgmedium.unionField = newPtr; |
| transferData.stgmedium.pUnkForRelease = 0; |
| transferData.result = COM.S_OK; |
| return; |
| } |
| |
| // did not match the TYMED |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.result = COM.DV_E_TYMED; |
| |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of plain text to a java <code>String</code>. |
| * For additional information see <code>Transfer#nativeToJava</code>. |
| * |
| * @param transferData the platform specific representation of the data to be |
| * been converted |
| * @return a java <code>String</code> containing text if the |
| * conversion was successful; otherwise null |
| */ |
| public Object nativeToJava(TransferData transferData){ |
| if (!isSupportedType(transferData) || transferData.pIDataObject == 0) { |
| transferData.result = COM.E_FAIL; |
| return null; |
| } |
| |
| IDataObject data = new IDataObject(transferData.pIDataObject); |
| data.AddRef(); |
| |
| FORMATETC formatetc = transferData.formatetc; |
| |
| STGMEDIUM stgmedium = new STGMEDIUM(); |
| stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.result = data.GetData(formatetc, stgmedium); |
| data.Release(); |
| |
| if (transferData.result != COM.S_OK) { |
| return null; |
| } |
| |
| int hMem = stgmedium.unionField; |
| /* Ensure byteCount is a multiple of 2 bytes on UNICODE platforms */ |
| int size = COM.GlobalSize(hMem) / TCHAR.sizeof * TCHAR.sizeof; |
| TCHAR buffer = new TCHAR(0, size / TCHAR.sizeof); |
| int ptr = COM.GlobalLock(hMem); |
| COM.MoveMemory(buffer, ptr, size); |
| COM.GlobalUnlock(hMem); |
| COM.GlobalFree(hMem); |
| return buffer.toString(0, buffer.strlen()); |
| } |
| protected int[] getTypeIds(){ |
| return new int[] {COM.IsUnicode ? COM.CF_UNICODETEXT : COM.CF_TEXT}; |
| } |
| protected String[] getTypeNames(){ |
| return new String[] {COM.IsUnicode ? "CF_UNICODETEXT" : "CF_TEXT"}; //$NON-NLS-1$//$NON-NLS-2$ |
| } |
| } |