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comparison dwt/dnd/FileTransfer.d @ 135:242e33c0e383

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Added dnd source, ByteArrayTransfer,Clipboard completed
author Frank Benoit <benoit@tionex.de>
date Wed, 13 Feb 2008 04:51:22 +0100
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134:fa7d7d66b9ed 135:242e33c0e383
1 /*******************************************************************************
2 * Copyright (c) 2000, 2006 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwt.dnd.FileTransfer;
14
15 import dwt.internal.ole.win32.COM;
16 import dwt.internal.win32.OS;
17
18
19 /**
20 * The class <code>FileTransfer</code> provides a platform specific mechanism
21 * for converting a list of files represented as a java <code>String[]</code> to a
22 * platform specific representation of the data and vice versa.
23 * Each <code>String</code> in the array contains the absolute path for a single
24 * file or directory.
25 * See <code>Transfer</code> for additional information.
26 *
27 * <p>An example of a java <code>String[]</code> containing a list of files is shown
28 * below:</p>
29 *
30 * <code><pre>
31 * File file1 = new File("C:\temp\file1");
32 * File file2 = new File("C:\temp\file2");
33 * String[] fileData = new String[2];
34 * fileData[0] = file1.getAbsolutePath();
35 * fileData[1] = file2.getAbsolutePath();
36 * </code></pre>
37 */
38 public class FileTransfer : ByteArrayTransfer {
39
40 private static FileTransfer _instance = new FileTransfer();
41 private static final String CF_HDROP = "CF_HDROP "; //$NON-NLS-1$
42 private static final int CF_HDROPID = COM.CF_HDROP;
43 private static final String CF_HDROP_SEPARATOR = "\0"; //$NON-NLS-1$
44
45 private this() {}
46
47 /**
48 * Returns the singleton instance of the FileTransfer class.
49 *
50 * @return the singleton instance of the FileTransfer class
51 */
52 public static FileTransfer getInstance () {
53 return _instance;
54 }
55
56 /**
57 * This implementation of <code>javaToNative</code> converts a list of file names
58 * represented by a java <code>String[]</code> to a platform specific representation.
59 * Each <code>String</code> in the array contains the absolute path for a single
60 * file or directory. For additional information see
61 * <code>Transfer#javaToNative</code>.
62 *
63 * @param object a java <code>String[]</code> containing the file names to be
64 * converted
65 * @param transferData an empty <code>TransferData</code> object; this
66 * object will be filled in on return with the platform specific format of the data
67 */
68 public void javaToNative(Object object, TransferData transferData) {
69 if (!checkFile(object) || !isSupportedType(transferData)) {
70 DND.error(DND.ERROR_INVALID_DATA);
71 }
72 String[] fileNames = (String[]) object;
73 StringBuffer allFiles = new StringBuffer();
74 for (int i = 0; i < fileNames.length; i++) {
75 allFiles.append(fileNames[i]);
76 allFiles.append(CF_HDROP_SEPARATOR); // each name is null terminated
77 }
78 TCHAR buffer = new TCHAR(0, allFiles.toString(), true); // there is an extra null terminator at the very end
79 DROPFILES dropfiles = new DROPFILES();
80 dropfiles.pFiles = DROPFILES.sizeof;
81 dropfiles.pt_x = dropfiles.pt_y = 0;
82 dropfiles.fNC = 0;
83 dropfiles.fWide = OS.IsUnicode ? 1 : 0;
84 // Allocate the memory because the caller (DropTarget) has not handed it in
85 // The caller of this method must release the data when it is done with it.
86 int byteCount = buffer.length() * TCHAR.sizeof;
87 int newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, DROPFILES.sizeof + byteCount);
88 OS.MoveMemory(newPtr, dropfiles, DROPFILES.sizeof);
89 OS.MoveMemory(newPtr + DROPFILES.sizeof, buffer, byteCount);
90 transferData.stgmedium = new STGMEDIUM();
91 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
92 transferData.stgmedium.unionField = newPtr;
93 transferData.stgmedium.pUnkForRelease = 0;
94 transferData.result = COM.S_OK;
95 }
96
97 /**
98 * This implementation of <code>nativeToJava</code> converts a platform specific
99 * representation of a list of file names to a java <code>String[]</code>.
100 * Each String in the array contains the absolute path for a single file or directory.
101 * For additional information see <code>Transfer#nativeToJava</code>.
102 *
103 * @param transferData the platform specific representation of the data to be
104 * been converted
105 * @return a java <code>String[]</code> containing a list of file names if the
106 * conversion was successful; otherwise null
107 */
108 public Object nativeToJava(TransferData transferData) {
109 if (!isSupportedType(transferData) || transferData.pIDataObject is 0) return null;
110
111 // get file names from IDataObject
112 IDataObject dataObject = new IDataObject(transferData.pIDataObject);
113 dataObject.AddRef();
114 FORMATETC formatetc = new FORMATETC();
115 formatetc.cfFormat = COM.CF_HDROP;
116 formatetc.ptd = 0;
117 formatetc.dwAspect = COM.DVASPECT_CONTENT;
118 formatetc.lindex = -1;
119 formatetc.tymed = COM.TYMED_HGLOBAL;
120 STGMEDIUM stgmedium = new STGMEDIUM();
121 stgmedium.tymed = COM.TYMED_HGLOBAL;
122 transferData.result = dataObject.GetData(formatetc, stgmedium);
123 dataObject.Release();
124 if (transferData.result !is COM.S_OK) return null;
125 // How many files are there?
126 int count = OS.DragQueryFile(stgmedium.unionField, 0xFFFFFFFF, null, 0);
127 String[] fileNames = new String[count];
128 for (int i = 0; i < count; i++) {
129 // How long is the name ?
130 int size = OS.DragQueryFile(stgmedium.unionField, i, null, 0) + 1;
131 TCHAR lpszFile = new TCHAR(0, size);
132 // Get file name and append it to string
133 OS.DragQueryFile(stgmedium.unionField, i, lpszFile, size);
134 fileNames[i] = lpszFile.toString(0, lpszFile.strlen());
135 }
136 OS.DragFinish(stgmedium.unionField); // frees data associated with HDROP data
137 return fileNames;
138 }
139
140 protected int[] getTypeIds(){
141 return new int[] {CF_HDROPID};
142 }
143
144 protected String[] getTypeNames(){
145 return new String[] {CF_HDROP};
146 }
147 bool checkFile(Object object) {
148 if (object is null || !(object instanceof String[]) || ((String[])object).length is 0) return false;
149 String[] strings = (String[])object;
150 for (int i = 0; i < strings.length; i++) {
151 if (strings[i] is null || strings[i].length() is 0) return false;
152 }
153 return true;
154 }
155
156 protected bool validate(Object object) {
157 return checkFile(object);
158 }
159 }