| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.dnd; |
| |
| import org.eclipse.swt.internal.ole.win32.*; |
| import org.eclipse.swt.internal.win32.*; |
| |
| /** |
| * 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. |
| * |
| * <p>An example of a java <code>String</code> containing plain text is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * String textData = "Hello World"; |
| * </code></pre> |
| * |
| * @see Transfer |
| */ |
| public class TextTransfer extends ByteArrayTransfer { |
| |
| private static TextTransfer _instance = new TextTransfer(); |
| private static final String CF_UNICODETEXT = "CF_UNICODETEXT"; //$NON-NLS-1$ |
| private static final String CF_TEXT = "CF_TEXT"; //$NON-NLS-1$ |
| private static final int CF_UNICODETEXTID = COM.CF_UNICODETEXT; |
| private static final int CF_TEXTID = COM.CF_TEXT; |
| |
| 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. |
| * |
| * @param object a java <code>String</code> containing text |
| * @param transferData an empty <code>TransferData</code> object that will |
| * be filled in on return with the platform specific format of the data |
| * |
| * @see Transfer#nativeToJava |
| */ |
| public void javaToNative (Object object, TransferData transferData){ |
| if (!checkText(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| transferData.result = COM.E_FAIL; |
| String string = (String)object; |
| switch (transferData.type) { |
| case COM.CF_UNICODETEXT: { |
| int charCount = string.length (); |
| char[] chars = new char[charCount+1]; |
| string.getChars (0, charCount, chars, 0); |
| int byteCount = chars.length * 2; |
| int /*long*/ newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount); |
| OS.MoveMemory(newPtr, chars, byteCount); |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.stgmedium.unionField = newPtr; |
| transferData.stgmedium.pUnkForRelease = 0; |
| transferData.result = COM.S_OK; |
| break; |
| } |
| case COM.CF_TEXT: { |
| int count = string.length(); |
| char[] chars = new char[count + 1]; |
| string.getChars(0, count, chars, 0); |
| int codePage = OS.GetACP(); |
| int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null); |
| if (cchMultiByte == 0) { |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.result = COM.DV_E_STGMEDIUM; |
| return; |
| } |
| int /*long*/ lpMultiByteStr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte); |
| OS.WideCharToMultiByte(codePage, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null); |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.stgmedium.unionField = lpMultiByteStr; |
| transferData.stgmedium.pUnkForRelease = 0; |
| transferData.result = COM.S_OK; |
| break; |
| } |
| } |
| return; |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of plain text to a java <code>String</code>. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>String</code> containing text if the conversion was successful; otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| public Object nativeToJava(TransferData transferData){ |
| if (!isSupportedType(transferData) || transferData.pIDataObject == 0) 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 = getData(data, formatetc, stgmedium); |
| data.Release(); |
| if (transferData.result != COM.S_OK) return null; |
| int /*long*/ hMem = stgmedium.unionField; |
| try { |
| switch (transferData.type) { |
| case CF_UNICODETEXTID: { |
| /* Ensure byteCount is a multiple of 2 bytes */ |
| int size = OS.GlobalSize(hMem) / 2 * 2; |
| if (size == 0) return null; |
| char[] chars = new char[size/2]; |
| int /*long*/ ptr = OS.GlobalLock(hMem); |
| if (ptr == 0) return null; |
| try { |
| OS.MoveMemory(chars, ptr, size); |
| int length = chars.length; |
| for (int i=0; i<chars.length; i++) { |
| if (chars [i] == '\0') { |
| length = i; |
| break; |
| } |
| } |
| return new String (chars, 0, length); |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } |
| case CF_TEXTID: { |
| int /*long*/ lpMultiByteStr = OS.GlobalLock(hMem); |
| if (lpMultiByteStr == 0) return null; |
| try { |
| int codePage = OS.GetACP(); |
| int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); |
| if (cchWideChar == 0) return null; |
| char[] lpWideCharStr = new char [cchWideChar - 1]; |
| OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length); |
| return new String(lpWideCharStr); |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } |
| } |
| } finally { |
| OS.GlobalFree(hMem); |
| } |
| return null; |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[] {CF_UNICODETEXTID, CF_TEXTID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[] {CF_UNICODETEXT, CF_TEXT}; |
| } |
| |
| boolean checkText(Object object) { |
| return (object != null && object instanceof String && ((String)object).length() > 0); |
| } |
| |
| protected boolean validate(Object object) { |
| return checkText(object); |
| } |
| } |