| /******************************************************************************* |
| * Copyright (c) 2000, 2017 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.*; |
| import org.eclipse.swt.internal.gtk.*; |
| |
| /** |
| * 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> |
| * |
| * <pre><code> |
| * String htmlData = "<p>This is a paragraph of text.</p>"; |
| * </code></pre> |
| * |
| * @see Transfer |
| */ |
| public class HTMLTransfer extends ByteArrayTransfer { |
| |
| private static HTMLTransfer _instance = new HTMLTransfer(); |
| private static final String TEXT_HTML = "text/html"; //$NON-NLS-1$ |
| private static final int TEXT_HTML_ID = registerType(TEXT_HTML); |
| private static final String TEXT_HTML2 = "TEXT/HTML"; //$NON-NLS-1$ |
| private static final int TEXT_HTML2_ID = registerType(TEXT_HTML2); |
| |
| 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){ |
| transferData.result = 0; |
| if (!checkHTML(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String string = (String)object; |
| byte[] utf8 = Converter.wcsToMbcs(string, true); |
| int byteCount = utf8.length; |
| long /*int*/ pValue = OS.g_malloc(byteCount); |
| if (pValue == 0) return; |
| C.memmove(pValue, utf8, byteCount); |
| transferData.length = byteCount; |
| transferData.format = 8; |
| transferData.pValue = pValue; |
| transferData.result = 1; |
| } |
| |
| /** |
| * 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.pValue == 0 ) return null; |
| /* Ensure byteCount is a multiple of 2 bytes */ |
| int size = (transferData.format * transferData.length / 8) / 2 * 2; |
| if (size <= 0) return null; |
| char[] bom = new char[1]; // look for a Byte Order Mark |
| if (size > 1) C.memmove (bom, transferData.pValue, 2); |
| String string; |
| if (bom[0] == '\ufeff' || bom[0] == '\ufffe') { |
| // utf16 |
| char[] chars = new char [size/2]; |
| C.memmove (chars, transferData.pValue, size); |
| string = new String (chars); |
| } else { |
| byte[] utf8 = new byte[size]; |
| C.memmove(utf8, transferData.pValue, size); |
| // convert utf8 byte array to a unicode string |
| char [] unicode = org.eclipse.swt.internal.Converter.mbcsToWcs (utf8); |
| string = new String (unicode); |
| } |
| int end = string.indexOf('\0'); |
| return (end == -1) ? string : string.substring(0, end); |
| } |
| @Override |
| protected int[] getTypeIds() { |
| return new int[] {TEXT_HTML_ID, TEXT_HTML2_ID}; |
| } |
| |
| @Override |
| protected String[] getTypeNames() { |
| return new String[] {TEXT_HTML, TEXT_HTML2}; |
| } |
| |
| boolean checkHTML(Object object) { |
| return (object != null && object instanceof String && ((String)object).length() > 0); |
| } |
| |
| @Override |
| protected boolean validate(Object object) { |
| return checkHTML(object); |
| } |
| } |