package org.eclipse.swt.dnd; | |
/* | |
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved. | |
* This file is 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 | |
*/ | |
import org.eclipse.swt.internal.win32.OS; | |
import org.eclipse.swt.internal.ole.win32.*; | |
/** | |
* The class <code>RTFTransfer</code> provides a platform specific mechanism | |
* for converting text in RTF format 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> containg RTF text is shown | |
* below:</p> | |
* <code><pre> | |
* String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}"; | |
* </code></pre> | |
*/ | |
public class RTFTransfer extends ByteArrayTransfer { | |
private static final String CF_RTF_NAME = "Rich Text Format"; | |
private static final int CF_RTF = registerType(CF_RTF_NAME); | |
private static RTFTransfer _instance = new RTFTransfer(); | |
private static int CodePage = OS.GetACP (); | |
private RTFTransfer() {} | |
/** | |
* Returns the singleton instance of the RTFTransfer class. | |
* | |
* @return the singleton instance of the RTFTransfer class | |
*/ | |
public static RTFTransfer getInstance () { | |
return _instance; | |
} | |
/** | |
* This implementation of <code>javaToNative</code> converts RTF-formatted 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 RTF 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; | |
} | |
// CF_RTF is stored as a null terminated byte array | |
if (isSupportedType(transferData)) { | |
String string = (String)object; | |
int count = string.length (); | |
char [] buffer = new char [count + 1]; | |
string.getChars (0, count, buffer, 0); | |
int cchMultiByte = OS.WideCharToMultiByte (CodePage, 0, buffer, -1, null, 0, null, null); | |
if (cchMultiByte == 0) { | |
transferData.stgmedium = new STGMEDIUM(); | |
transferData.result = COM.DV_E_STGMEDIUM; | |
return; | |
} | |
int lpMultiByteStr = COM.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte); | |
OS.WideCharToMultiByte (CodePage, 0, buffer, -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; | |
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 RTF 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 RTF 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(); | |
STGMEDIUM stgmedium = new STGMEDIUM(); | |
FORMATETC formatetc = transferData.formatetc; | |
stgmedium.tymed = COM.TYMED_HGLOBAL; | |
transferData.result = data.GetData(formatetc, stgmedium); | |
data.Release(); | |
if (transferData.result != COM.S_OK) return null; | |
int lpMultiByteStr = COM.GlobalLock(stgmedium.unionField); | |
if (lpMultiByteStr != 0) { | |
try { | |
int cchWideChar = OS.MultiByteToWideChar (CodePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); | |
if (cchWideChar != 0) { | |
char[] lpWideCharStr = new char [cchWideChar]; | |
OS.MultiByteToWideChar (CodePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, cchWideChar); | |
return new String(lpWideCharStr); | |
} | |
} finally { | |
COM.GlobalUnlock(lpMultiByteStr); | |
} | |
} | |
return null; | |
} | |
protected int[] getTypeIds(){ | |
return new int[] {CF_RTF}; | |
} | |
protected String[] getTypeNames(){ | |
return new String[] {"CF_RTF"}; | |
} | |
} |