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/*******************************************************************************
* Copyright (c) 2007 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 a Image represented as a java <code>ImageData</code> to a
* platform specific representation of the data and vice versa.
* See <code>Transfer</code> for additional information.
*
* <p>An example of a java <code>ImageData</code> is shown
* below:</p>
*
* <code><pre>
* Image image = new Image("C:\temp\img1.gif");
* ImageData imgData = image.getImageData();
* </code></pre>
*/
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.
* For additional information see <code>Transfer#javaToNative</code>.
*
* @param object a java <code>ImageData</code> containing the ImageData to be
* converted
* @param transferData an empty <code>TransferData</code> object; this
* object will be filled in on return with the platform specific format of the data
*/
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 <code>ImageData</code> to java.
* For additional information see <code>Transfer#nativeToJava</code>.
*
* @param transferData the platform specific representation of the data to be
* been converted
* @return a java <code>ImageData</code> the imageData of the image if
* conversion was successful; otherwise null
*/
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);
}
}
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