| /******************************************************************************* |
| * 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>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 COMPOUND_TEXT = "COMPOUND_TEXT"; //$NON-NLS-1$ |
| private static final String UTF8_STRING = "UTF8_STRING"; //$NON-NLS-1$ |
| private static final String STRING = "STRING"; //$NON-NLS-1$ |
| private static final int COMPOUND_TEXT_ID = registerType(COMPOUND_TEXT); |
| private static final int UTF8_STRING_ID = registerType(UTF8_STRING); |
| private static final int STRING_ID = registerType(STRING); |
| |
| 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) { |
| transferData.result = 0; |
| if (!checkText(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String string = (String)object; |
| byte[] utf8 = Converter.wcsToMbcs (string, true); |
| if (OS.isX11() && transferData.type == COMPOUND_TEXT_ID) { |
| long [] encoding = new long [1]; |
| int[] format = new int[1]; |
| long [] ctext = new long [1]; |
| int[] length = new int[1]; |
| boolean result = GDK.gdk_x11_display_utf8_to_compound_text (GDK.gdk_display_get_default(), utf8, encoding, format, ctext, length); |
| if (!result) return; |
| transferData.type = encoding[0]; |
| transferData.format = format[0]; |
| transferData.length = length[0]; |
| transferData.pValue = ctext[0]; |
| transferData.result = 1; |
| } |
| if (transferData.type == UTF8_STRING_ID) { |
| long pValue = OS.g_malloc(utf8.length); |
| if (pValue == 0) return; |
| C.memmove(pValue, utf8, utf8.length); |
| transferData.type = UTF8_STRING_ID; |
| transferData.format = 8; |
| transferData.length = utf8.length - 1; |
| transferData.pValue = pValue; |
| transferData.result = 1; |
| } |
| if (transferData.type == STRING_ID) { |
| long string_target = GDK.gdk_utf8_to_string_target(utf8); |
| if (string_target == 0) return; |
| transferData.type = STRING_ID; |
| transferData.format = 8; |
| transferData.length = C.strlen(string_target); |
| transferData.pValue = string_target; |
| transferData.result = 1; |
| } |
| } |
| |
| /** |
| * 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.pValue == 0) return null; |
| long [] list = new long [1]; |
| int count = GDK.gdk_text_property_to_utf8_list_for_display(GDK.gdk_display_get_default(), transferData.type, transferData.format, transferData.pValue, transferData.length, list); |
| if (count == 0) return null; |
| long [] ptr = new long [1]; |
| C.memmove(ptr, list[0], C.PTR_SIZEOF); |
| int length = C.strlen(ptr[0]); |
| byte[] utf8 = new byte[length]; |
| C.memmove(utf8, ptr[0], length); |
| OS.g_strfreev(list[0]); |
| // convert utf8 byte array to a unicode string |
| char [] unicode = Converter.mbcsToWcs (utf8); |
| String string = new String (unicode); |
| int end = string.indexOf('\0'); |
| return (end == -1) ? string : string.substring(0, end); |
| } |
| |
| @Override |
| protected int[] getTypeIds() { |
| if (OS.isX11()) { |
| return new int[] {UTF8_STRING_ID, COMPOUND_TEXT_ID, STRING_ID}; |
| } |
| return new int[] {UTF8_STRING_ID, STRING_ID}; |
| } |
| |
| @Override |
| protected String[] getTypeNames() { |
| if (OS.isX11()) { |
| return new String[] {UTF8_STRING, COMPOUND_TEXT, STRING}; |
| } |
| return new String[] {UTF8_STRING, STRING}; |
| } |
| |
| boolean checkText(Object object) { |
| return (object != null && object instanceof String && ((String)object).length() > 0); |
| } |
| |
| @Override |
| protected boolean validate(Object object) { |
| return checkText(object); |
| } |
| } |