| /******************************************************************************* |
| * 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 <code>HTMLTransfer</code> provides a platform specific mechanism |
| * for converting text in HTML 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 HTML text is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * String htmlData = "<p>This is a paragraph of text.</p>"; |
| * </code></pre> |
| * |
| * @see Transfer |
| */ |
| public class HTMLTransfer extends ByteArrayTransfer { |
| |
| static HTMLTransfer _instance = new HTMLTransfer(); |
| static final String HTML_FORMAT = "HTML Format"; //$NON-NLS-1$ |
| static final int HTML_FORMATID = registerType(HTML_FORMAT); |
| static final String NUMBER = "00000000"; //$NON-NLS-1$ |
| static final String HEADER = "Version:0.9\r\nStartHTML:"+NUMBER+"\r\nEndHTML:"+NUMBER+"\r\nStartFragment:"+NUMBER+"\r\nEndFragment:"+NUMBER+"\r\n"; |
| static final String PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$ |
| static final String SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$ |
| static final String StartFragment = "StartFragment:"; //$NON-NLS-1$ |
| static final String EndFragment = "EndFragment:"; //$NON-NLS-1$ |
| |
| private HTMLTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the HTMLTransfer class. |
| * |
| * @return the singleton instance of the HTMLTransfer class |
| */ |
| public static HTMLTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts HTML-formatted text |
| * represented by a java <code>String</code> to a platform specific representation. |
| * |
| * @param object a java <code>String</code> containing HTML 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 (!checkHTML(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String string = (String)object; |
| int count = string.length(); |
| char[] chars = new char[count + 1]; |
| string.getChars(0, count, chars, 0); |
| /* NOTE: CF_HTML uses UTF-8 encoding. */ |
| int cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null); |
| if (cchMultiByte == 0) { |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.result = COM.DV_E_STGMEDIUM; |
| return; |
| } |
| int startHTML = HEADER.length(); |
| int startFragment = startHTML + PREFIX.length(); |
| int endFragment = startFragment + cchMultiByte - 1; |
| int endHTML = endFragment + SUFFIX.length(); |
| |
| StringBuffer buffer = new StringBuffer(HEADER); |
| int maxLength = NUMBER.length(); |
| //startHTML |
| int start = buffer.toString().indexOf(NUMBER); |
| String temp = Integer.toString(startHTML); |
| buffer.replace(start + maxLength-temp.length(), start + maxLength, temp); |
| //endHTML |
| start = buffer.toString().indexOf(NUMBER, start); |
| temp = Integer.toString(endHTML); |
| buffer.replace(start + maxLength-temp.length(), start + maxLength, temp); |
| //startFragment |
| start = buffer.toString().indexOf(NUMBER, start); |
| temp = Integer.toString(startFragment); |
| buffer.replace(start + maxLength-temp.length(), start + maxLength, temp); |
| //endFragment |
| start = buffer.toString().indexOf(NUMBER, start); |
| temp = Integer.toString(endFragment); |
| buffer.replace(start + maxLength-temp.length(), start + maxLength, temp); |
| |
| buffer.append(PREFIX); |
| buffer.append(string); |
| buffer.append(SUFFIX); |
| |
| count = buffer.length(); |
| chars = new char[count + 1]; |
| buffer.getChars(0, count, chars, 0); |
| cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, chars, -1, null, 0, null, null); |
| long /*int*/ lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte); |
| OS.WideCharToMultiByte(OS.CP_UTF8, 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 HTML 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 HTML 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 /*int*/ hMem = stgmedium.unionField; |
| |
| try { |
| long /*int*/ lpMultiByteStr = OS.GlobalLock(hMem); |
| if (lpMultiByteStr == 0) return null; |
| try { |
| /* NOTE: CF_HTML uses UTF-8 encoding. |
| * The MSDN documentation for MultiByteToWideChar states that dwFlags must be set to 0 for UTF-8. |
| * Otherwise, the function fails with ERROR_INVALID_FLAGS. */ |
| int cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, null, 0); |
| if (cchWideChar == 0) return null; |
| char[] lpWideCharStr = new char [cchWideChar - 1]; |
| OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length); |
| String string = new String(lpWideCharStr); |
| int fragmentStart = 0, fragmentEnd = 0; |
| int start = string.indexOf(StartFragment) + StartFragment.length(); |
| int end = start + 1; |
| while (end < string.length()) { |
| String s = string.substring(start, end); |
| try { |
| fragmentStart = Integer.parseInt(s); |
| end++; |
| } catch (NumberFormatException e) { |
| break; |
| } |
| } |
| start = string.indexOf(EndFragment) + EndFragment.length(); |
| end = start + 1; |
| while (end < string.length()) { |
| String s = string.substring(start, end); |
| try { |
| fragmentEnd = Integer.parseInt(s); |
| end++; |
| } catch (NumberFormatException e) { |
| break; |
| } |
| } |
| if (fragmentEnd <= fragmentStart || fragmentEnd > OS.strlen(lpMultiByteStr)) return null; |
| cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr+fragmentStart, fragmentEnd - fragmentStart, lpWideCharStr, lpWideCharStr.length); |
| if (cchWideChar == 0) return null; |
| String s = new String(lpWideCharStr, 0, cchWideChar); |
| /* |
| * Firefox includes <!--StartFragment --> in the fragment, so remove it. |
| */ |
| String foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$ |
| int prefix = s.indexOf(foxStart); |
| if (prefix != -1) { |
| prefix += foxStart.length(); |
| s = s.substring(prefix); |
| } |
| return s; |
| } finally { |
| OS.GlobalUnlock(hMem); |
| } |
| } finally { |
| OS.GlobalFree(hMem); |
| } |
| } |
| @Override |
| protected int[] getTypeIds(){ |
| return new int[] {HTML_FORMATID}; |
| } |
| @Override |
| protected String[] getTypeNames(){ |
| return new String[] {HTML_FORMAT}; |
| } |
| boolean checkHTML(Object object) { |
| return (object != null && object instanceof String && ((String)object).length() > 0); |
| } |
| @Override |
| protected boolean validate(Object object) { |
| return checkHTML(object); |
| } |
| } |