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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.ole.win32.*;
/**
* The <code>TransferData</code> class is a platform specific data structure for
* describing the type and the contents of data being converted by a transfer agent.
*
* <p>As an application writer, you do not need to know the specifics of
* TransferData. TransferData instances are passed to a subclass of Transfer
* and the Transfer object manages the platform specific issues.
* You can ask a Transfer subclass if it can handle this data by calling
* Transfer.isSupportedType(transferData).</p>
*
* <p>You should only need to become familiar with the fields in this class if you
* are implementing a Transfer subclass and you are unable to subclass the
* ByteArrayTransfer class.</p>
*/
public class TransferData {
/**
* The type is a unique identifier of a system format or user defined format.
* (Warning: This field is platform dependent)
*/
public int type;
/**
* The formatetc structure is a generalized data transfer format, enhanced to
* encompass a target device, the aspect, or view of the data, and
* a storage medium.
* (Warning: This field is platform dependent)
*/
public FORMATETC formatetc;
/**
* The stgmedium structure is a generalized global memory handle used for
* data transfer operations.
* (Warning: This field is platform dependent)
*/
public STGMEDIUM stgmedium;
/**
* The result field contains the result of converting a
* java data type into a platform specific value.
* (Warning: This field is platform dependent)
*
* <p>The value of result is 1 if the conversion was successful.
* The value of result is 0 if the conversion failed.</p>
*/
public int result = COM.E_FAIL;
/**
* The pIDataObject is the address of an IDataObject OLE Interface which
* provides access to the data associated with the transfer.
* (Warning: This field is platform dependent)
*/
public int pIDataObject;
static boolean sameType(TransferData data1, TransferData data2) {
if (data1 == data2) return true;
if (data1 == null || data2 == null) return false;
return (data1.type == data2.type &&
data1.formatetc.cfFormat == data2.formatetc.cfFormat &&
data1.formatetc.dwAspect == data2.formatetc.dwAspect &&
data1.formatetc.tymed == data2.formatetc.tymed);
}
}
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