| /******************************************************************************* |
| * Copyright (c) 2007, 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.SWT; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.motif.*; |
| import org.eclipse.swt.widgets.Display; |
| |
| /** |
| * The class <code>ImageTransfer</code> provides a platform specific mechanism |
| * for converting an Image represented as a java <code>ImageData</code> to a |
| * platform specific representation of the data and vice versa. |
| * |
| * <p>An example of a java <code>ImageData</code> is shown below:</p> |
| * |
| * <code><pre> |
| * Image image = new Image(display, "C:\temp\img1.gif"); |
| * ImageData imgData = image.getImageData(); |
| * </code></pre> |
| * |
| * @see Transfer |
| * |
| * @since 3.4 |
| */ |
| public class ImageTransfer extends ByteArrayTransfer { |
| |
| private static ImageTransfer _instance = new ImageTransfer(); |
| |
| private static final String PIXMAP = "PIXMAP"; //$NON-NLS-1$ |
| private static final int PIXMAP_ID = registerType(PIXMAP); |
| |
| private ImageTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the ImageTransfer class. |
| * |
| * @return the singleton instance of the ImageTransfer class |
| */ |
| public static ImageTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts an ImageData object represented |
| * by java <code>ImageData</code> to a platform specific representation. |
| * |
| * @param object a java <code>ImageData</code> containing the ImageData to be converted |
| * @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 (!checkImage(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| ImageData imgData = (ImageData)object; |
| if (imgData == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| Image image = new Image(Display.getCurrent(), imgData); |
| int pixmap = image.pixmap; |
| int pValue = OS.XtMalloc(4); |
| if (pValue == 0) return; |
| OS.memmove(pValue, new int [] {pixmap}, 4); |
| transferData.type = PIXMAP_ID; |
| transferData.format = 32; |
| transferData.length = 1; |
| transferData.pValue = pValue; |
| transferData.result = 1; |
| } |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of an image to java <code>ImageData</code>. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>ImageData</code> of the image if the conversion was successful; |
| * otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| public Object nativeToJava(TransferData transferData) { |
| if (!isSupportedType(transferData) || transferData.pValue == 0) return null; |
| int length = transferData.length; |
| if (length == 0) return null; |
| int [] pixmap = new int [1]; |
| OS.memmove(pixmap, transferData.pValue, length * 4); |
| Image image = Image.motif_new(Display.getCurrent(), SWT.BITMAP, pixmap[0], 0); |
| ImageData imgData = image.getImageData(); |
| image.dispose(); |
| return imgData; |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[]{PIXMAP_ID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[]{PIXMAP}; |
| } |
| |
| boolean checkImage(Object object) { |
| if (object == null || !(object instanceof ImageData)) return false; |
| return true; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkImage(object); |
| } |
| } |