| /******************************************************************************* |
| * Copyright (c) 2000, 2012 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.internal.ole.win32.*; |
| import org.eclipse.swt.internal.win32.*; |
| |
| /** |
| * The class <code>FileTransfer</code> provides a platform specific mechanism |
| * for converting a list of files represented as a java <code>String[]</code> to a |
| * platform specific representation of the data and vice versa. |
| * Each <code>String</code> in the array contains the absolute path for a single |
| * file or directory. |
| * |
| * <p>An example of a java <code>String[]</code> containing a list of files is shown |
| * below:</p> |
| * |
| * <code><pre> |
| * File file1 = new File("C:\temp\file1"); |
| * File file2 = new File("C:\temp\file2"); |
| * String[] fileData = new String[2]; |
| * fileData[0] = file1.getAbsolutePath(); |
| * fileData[1] = file2.getAbsolutePath(); |
| * </code></pre> |
| * |
| * @see Transfer |
| */ |
| public class FileTransfer extends ByteArrayTransfer { |
| |
| private static FileTransfer _instance = new FileTransfer(); |
| private static final String CF_HDROP = "CF_HDROP "; //$NON-NLS-1$ |
| private static final int CF_HDROPID = COM.CF_HDROP; |
| private static final String CF_HDROP_SEPARATOR = "\0"; //$NON-NLS-1$ |
| |
| private FileTransfer() {} |
| |
| /** |
| * Returns the singleton instance of the FileTransfer class. |
| * |
| * @return the singleton instance of the FileTransfer class |
| */ |
| public static FileTransfer getInstance () { |
| return _instance; |
| } |
| |
| /** |
| * This implementation of <code>javaToNative</code> converts a list of file names |
| * represented by a java <code>String[]</code> to a platform specific representation. |
| * Each <code>String</code> in the array contains the absolute path for a single |
| * file or directory. |
| * |
| * @param object a java <code>String[]</code> containing the file names 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 (!checkFile(object) || !isSupportedType(transferData)) { |
| DND.error(DND.ERROR_INVALID_DATA); |
| } |
| String[] fileNames = (String[]) object; |
| StringBuffer allFiles = new StringBuffer(); |
| for (int i = 0; i < fileNames.length; i++) { |
| allFiles.append(fileNames[i]); |
| allFiles.append(CF_HDROP_SEPARATOR); // each name is null terminated |
| } |
| TCHAR buffer = new TCHAR(0, allFiles.toString(), true); // there is an extra null terminator at the very end |
| DROPFILES dropfiles = new DROPFILES(); |
| dropfiles.pFiles = DROPFILES.sizeof; |
| dropfiles.pt_x = dropfiles.pt_y = 0; |
| dropfiles.fNC = 0; |
| dropfiles.fWide = OS.IsUnicode ? 1 : 0; |
| // Allocate the memory because the caller (DropTarget) has not handed it in |
| // The caller of this method must release the data when it is done with it. |
| int byteCount = buffer.length() * TCHAR.sizeof; |
| long /*int*/ newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, DROPFILES.sizeof + byteCount); |
| OS.MoveMemory(newPtr, dropfiles, DROPFILES.sizeof); |
| OS.MoveMemory(newPtr + DROPFILES.sizeof, buffer, byteCount); |
| transferData.stgmedium = new STGMEDIUM(); |
| transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.stgmedium.unionField = newPtr; |
| transferData.stgmedium.pUnkForRelease = 0; |
| transferData.result = COM.S_OK; |
| } |
| |
| /** |
| * This implementation of <code>nativeToJava</code> converts a platform specific |
| * representation of a list of file names to a java <code>String[]</code>. |
| * Each String in the array contains the absolute path for a single file or directory. |
| * |
| * @param transferData the platform specific representation of the data to be converted |
| * @return a java <code>String[]</code> containing a list of file names if the conversion |
| * was successful; otherwise null |
| * |
| * @see Transfer#javaToNative |
| */ |
| public Object nativeToJava(TransferData transferData) { |
| if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null; |
| |
| // get file names from IDataObject |
| IDataObject dataObject = new IDataObject(transferData.pIDataObject); |
| dataObject.AddRef(); |
| FORMATETC formatetc = new FORMATETC(); |
| formatetc.cfFormat = COM.CF_HDROP; |
| formatetc.ptd = 0; |
| formatetc.dwAspect = COM.DVASPECT_CONTENT; |
| formatetc.lindex = -1; |
| formatetc.tymed = COM.TYMED_HGLOBAL; |
| STGMEDIUM stgmedium = new STGMEDIUM(); |
| stgmedium.tymed = COM.TYMED_HGLOBAL; |
| transferData.result = getData(dataObject, formatetc, stgmedium); |
| dataObject.Release(); |
| if (transferData.result != COM.S_OK) return null; |
| // How many files are there? |
| int count = OS.DragQueryFile(stgmedium.unionField, 0xFFFFFFFF, null, 0); |
| String[] fileNames = new String[count]; |
| for (int i = 0; i < count; i++) { |
| // How long is the name ? |
| int size = OS.DragQueryFile(stgmedium.unionField, i, null, 0) + 1; |
| TCHAR lpszFile = new TCHAR(0, size); |
| // Get file name and append it to string |
| OS.DragQueryFile(stgmedium.unionField, i, lpszFile, size); |
| fileNames[i] = lpszFile.toString(0, lpszFile.strlen()); |
| } |
| OS.DragFinish(stgmedium.unionField); // frees data associated with HDROP data |
| return fileNames; |
| } |
| |
| protected int[] getTypeIds(){ |
| return new int[] {CF_HDROPID}; |
| } |
| |
| protected String[] getTypeNames(){ |
| return new String[] {CF_HDROP}; |
| } |
| boolean checkFile(Object object) { |
| if (object == null || !(object instanceof String[]) || ((String[])object).length == 0) return false; |
| String[] strings = (String[])object; |
| for (int i = 0; i < strings.length; i++) { |
| if (strings[i] == null || strings[i].length() == 0) return false; |
| } |
| return true; |
| } |
| |
| protected boolean validate(Object object) { |
| return checkFile(object); |
| } |
| } |