diff options
Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java')
-rwxr-xr-x | bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TextTransfer.java | 184 |
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); +} +} |