| /******************************************************************************* |
| * Copyright (c) 2000, 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.wpf.OS; |
| |
| /** |
| * 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 int TYPEID = getTypeId(); |
| |
| static int getTypeId() { |
| int format = OS.DataFormats_Bitmap(); |
| String name = createJavaString(format); |
| OS.GCHandle_Free(format); |
| return registerType(name); |
| } |
| |
| 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(null, imgData); |
| transferData.pValue = image.handle; |
| } |
| |
| /** |
| * 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; |
| |
| Image image = Image.wpf_new (null, SWT.BITMAP, transferData.pValue); |
| ImageData imageData = image.getImageData (); |
| image.dispose (); |
| return imageData; |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[]{TYPEID}; |
| } |
| |
| boolean checkImage(Object object) { |
| if (object == null || !(object instanceof ImageData)) return false; |
| return true; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkImage(object); |
| } |
| } |