1 files changed, 184 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java
new file mode 100755
index 0000000000..94b3cf0fed
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java
@@ -0,0 +1,184 @@
+/*******************************************************************************
+ * 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);
+}
+}