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SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented.
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/*******************************************************************************
 * Copyright (c) 2000, 2012 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 RTFTransfer provides a platform specific mechanism 
 * for converting text in RTF format represented as a java String 
 * to a platform specific representation of the data and vice versa.
 * 
 * An example of a java String containing RTF text is shown 
 * below:
 * 
 *  *     String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}";
 * 
*
* @see Transfer
*/
public class RTFTransfer extends ByteArrayTransfer {
private static RTFTransfer _instance = new RTFTransfer();
private static final String CF_RTF = "Rich Text Format"; //$NON-NLS-1$
private static final int CF_RTFID = registerType(CF_RTF);
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 javaToNative converts RTF-formatted text
* represented by a java String to a platform specific representation.
*
* @param object a java String containing RTF text
* @param transferData an empty TransferData 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 (!checkRTF(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
// CF_RTF is stored as a null terminated byte array
String string = (String)object;
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;
return;
}
/**
* This implementation of nativeToJava converts a platform specific
* representation of RTF text to a java String.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java String containing RTF 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();
STGMEDIUM stgmedium = new STGMEDIUM();
FORMATETC formatetc = transferData.formatetc;
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 {
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);
}
}
protected int[] getTypeIds(){
return new int[] {CF_RTFID};
}
protected String[] getTypeNames(){
return new String[] {CF_RTF};
}
boolean checkRTF(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
protected boolean validate(Object object) {
return checkRTF(object);
}
}