--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2012 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * 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>
+ *
+ * <pre><code>
+ * String textData = "Hello World";
+ * </code></pre>
+ *
+ * <p>Note the <code>TextTransfer</code> does not change the content of the text
+ * data. For a better integration with the platform, the application should convert
+ * the line delimiters used in the text data to the standard line delimiter used by the
+ * platform.
+ * </p>
+ *
+ * @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
+ */
+@Override
+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;
+ 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;
+ }
+ 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
+ */
+@Override
+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;
+ 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];
+ 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: {
+ 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;
+}
+
+@Override
+protected int[] getTypeIds(){
+ return new int[] {CF_UNICODETEXTID, CF_TEXTID};
+}
+
+@Override
+protected String[] getTypeNames(){
+ return new String[] {CF_UNICODETEXT, CF_TEXT};
+}
+
+boolean checkText(Object object) {
+ return (object != null && object instanceof String && ((String)object).length() > 0);
+}
+
+@Override
+protected boolean validate(Object object) {
+ return checkText(object);
+}
+}
Code Review / simantics / platform.git / blobdiff