org.eclipse.swt.dnd.RTFTransfer Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.swt.gtk.linux.ppc64le Show documentation
Standard Widget Toolkit for GTK on ppc64le
The newest version!
/*******************************************************************************
 * 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 RTFTransfer provides a platform specific mechanism
 * for converting text in RTF format represented as a java String
 * to a platform specific representation of the data and vice versa.
 *
 * An example of a java String containing RTF text is shown
 * below:
 *
 * 
 *     String rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i Hello World}";
 * 
 *
 * @see Transfer
 */
public class RTFTransfer extends ByteArrayTransfer {

	private static RTFTransfer _instance = new RTFTransfer();
	private static final String TEXT_RTF = "text/rtf"; //$NON-NLS-1$
	private static final int TEXT_RTF_ID = GTK.GTK4 ? 0 : registerType(TEXT_RTF);
	private static final String TEXT_RTF2 = "TEXT/RTF"; //$NON-NLS-1$
	private static final int TEXT_RTF2_ID = GTK.GTK4 ? 0 : registerType(TEXT_RTF2);
	private static final String APPLICATION_RTF = "application/rtf"; //$NON-NLS-1$
	private static final int APPLICATION_RTF_ID = GTK.GTK4 ? 0 : registerType(APPLICATION_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 javaToNative converts RTF-formatted text
 * represented by a java String to a platform specific representation.
 *
 * @param object a java String containing RTF text
 * @param transferData an empty TransferData 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 (!checkRTF(object) || !isSupportedType(transferData)) {
		DND.error(DND.ERROR_INVALID_DATA);
	}
	String string = (String)object;
	byte [] buffer = Converter.wcsToMbcs (string, true);
	long pValue = OS.g_malloc(buffer.length);
	if (pValue == 0) return;
	C.memmove(pValue, buffer, buffer.length);
	transferData.length = buffer.length - 1;
	transferData.format = 8;
	transferData.pValue = pValue;
	transferData.result = 1;
}

/**
 * This implementation of nativeToJava converts a platform specific
 * representation of RTF text to a java String.
 *
 * @param transferData the platform specific representation of the data to be converted
 * @return a java String containing RTF 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;
	int size = transferData.format * transferData.length / 8;
	if (size == 0) return null;
	byte[] buffer = new byte[size];
	C.memmove(buffer, transferData.pValue, size);
	char [] chars = Converter.mbcsToWcs (buffer);
	String string = new String (chars);
	int end = string.indexOf('\0');
	return (end == -1) ? string : string.substring(0, end);
}

@Override
protected int[] getTypeIds() {
	if(GTK.GTK4) {
		return new int[] {(int) OS.G_TYPE_STRING()};
	}
	return new int[] {TEXT_RTF_ID, TEXT_RTF2_ID, APPLICATION_RTF_ID};
}

@Override
protected String[] getTypeNames() {
	if(GTK.GTK4) {
		return new String[] {TEXT_RTF};
	}
	return new String[] {TEXT_RTF, TEXT_RTF2, APPLICATION_RTF};
}

boolean checkRTF(Object object) {
	return (object instanceof String && !((String)object).isEmpty());
}

@Override
protected boolean validate(Object object) {
	return checkRTF(object);
}
}