Work around SWT 4.13 - 4.18 Win32 DnD bug 567422

[simantics/platform.git] / bundles / org.eclipse.swt.win32.win32.x86_64 / src / org / eclipse / swt / dnd / RTFTransfer.java

diff --git a/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/dnd/RTFTransfer.java b/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/dnd/RTFTransfer.java
new file mode 100644 (file)
index 0000000..ab1fbb1
--- /dev/null
+++ b/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/dnd/RTFTransfer.java
@@ -0,0 +1,145 @@
+/*******************************************************************************
+ * 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>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.
+ *
+ * <p>An example of a java <code>String</code> containing RTF text is shown
+ * below:</p>
+ *
+ * <pre><code>
+ *     String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}";
+ * </code></pre>
+ *
+ * @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 <code>javaToNative</code> converts RTF-formatted text
+ * represented by a java <code>String</code> to a platform specific representation.
+ *
+ * @param object a java <code>String</code> containing RTF 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 (!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;
+       }
+       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 <code>nativeToJava</code> converts a platform specific
+ * representation of RTF 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 RTF 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();
+       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;
+       long hMem = stgmedium.unionField;
+       try {
+               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);
+       }
+}
+
+@Override
+protected int[] getTypeIds(){
+       return new int[] {CF_RTFID};
+}
+
+@Override
+protected String[] getTypeNames(){
+       return new String[] {CF_RTF};
+}
+
+boolean checkRTF(Object object) {
+       return (object != null  && object instanceof String && ((String)object).length() > 0);
+}
+
+@Override
+protected boolean validate(Object object) {
+       return checkRTF(object);
+}
+}