Mercurial > projects > dwt-win
annotate dwt/dnd/TextTransfer.d @ 142:c48567faeab1
TextTransfer
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 13 Feb 2008 16:26:35 +0100 |
parents | 242e33c0e383 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2005 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module dwt.dnd.TextTransfer; |
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14 |
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15 import dwt.internal.ole.win32.COM; |
142 | 16 import dwt.internal.ole.win32.OBJIDL; |
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17 import dwt.internal.win32.OS; |
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18 |
142 | 19 import dwt.dnd.ByteArrayTransfer; |
20 import dwt.dnd.TransferData; | |
21 import dwt.dnd.DND; | |
22 | |
23 import dwt.dwthelper.Integer; | |
24 import dwt.dwthelper.utils; | |
25 static import tango.text.Text; | |
26 alias tango.text.Text.Text!(char) StringBuffer; | |
27 | |
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28 /** |
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29 * The class <code>TextTransfer</code> provides a platform specific mechanism |
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30 * for converting plain text represented as a java <code>String</code> |
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31 * to a platform specific representation of the data and vice versa. |
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32 * |
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33 * <p>An example of a java <code>String</code> containing plain text is shown |
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34 * below:</p> |
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35 * |
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36 * <code><pre> |
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37 * String textData = "Hello World"; |
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38 * </code></pre> |
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39 * |
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40 * @see Transfer |
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41 */ |
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42 public class TextTransfer : ByteArrayTransfer { |
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43 |
142 | 44 private static TextTransfer _instance; |
45 private static const char[] CF_UNICODETEXT = "CF_UNICODETEXT"; //$NON-NLS-1$ | |
46 private static const char[] CF_TEXT = "CF_TEXT"; //$NON-NLS-1$ | |
47 private static const int CF_UNICODETEXTID = COM.CF_UNICODETEXT; | |
48 private static const int CF_TEXTID = COM.CF_TEXT; | |
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49 |
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50 private this() {} |
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51 |
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52 /** |
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53 * Returns the singleton instance of the TextTransfer class. |
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54 * |
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55 * @return the singleton instance of the TextTransfer class |
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56 */ |
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57 public static TextTransfer getInstance () { |
142 | 58 if( _instance is null ){ |
59 synchronized { | |
60 if( _instance is null ){ | |
61 _instance = new TextTransfer(); | |
62 } | |
63 } | |
64 } | |
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65 return _instance; |
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66 } |
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67 |
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68 /** |
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69 * This implementation of <code>javaToNative</code> converts plain text |
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70 * represented by a java <code>String</code> to a platform specific representation. |
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71 * |
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72 * @param object a java <code>String</code> containing text |
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73 * @param transferData an empty <code>TransferData</code> object; this object |
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74 * will be filled in on return with the platform specific format of the data |
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75 * |
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76 * @see Transfer#javaToNative |
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77 */ |
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78 public void javaToNative (Object object, TransferData transferData){ |
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79 if (!checkText(object) || !isSupportedType(transferData)) { |
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80 DND.error(DND.ERROR_INVALID_DATA); |
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81 } |
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82 transferData.result = COM.E_FAIL; |
142 | 83 char[] string = (cast(ArrayWrapperString)object).array; |
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84 switch (transferData.type) { |
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85 case COM.CF_UNICODETEXT: { |
142 | 86 wchar[] chars = StrToWCHARs(0,string, true); |
87 int charCount = chars.length; | |
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88 int byteCount = chars.length * 2; |
142 | 89 auto newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount); |
90 OS.MoveMemory(newPtr, chars.ptr, byteCount); | |
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91 transferData.stgmedium = new STGMEDIUM(); |
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92 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
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93 transferData.stgmedium.unionField = newPtr; |
142 | 94 transferData.stgmedium.pUnkForRelease = null; |
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95 transferData.result = COM.S_OK; |
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96 break; |
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97 } |
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98 case COM.CF_TEXT: { |
142 | 99 wchar[] chars = StrToWCHARs(0,string, true); |
100 int count = chars.length; | |
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101 int codePage = OS.GetACP(); |
142 | 102 int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars.ptr, -1, null, 0, null, null); |
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103 if (cchMultiByte is 0) { |
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104 transferData.stgmedium = new STGMEDIUM(); |
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105 transferData.result = COM.DV_E_STGMEDIUM; |
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106 return; |
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107 } |
142 | 108 auto lpMultiByteStr = cast(char*)OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte); |
109 OS.WideCharToMultiByte(codePage, 0, chars.ptr, -1, lpMultiByteStr, cchMultiByte, null, null); | |
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110 transferData.stgmedium = new STGMEDIUM(); |
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111 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
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112 transferData.stgmedium.unionField = lpMultiByteStr; |
142 | 113 transferData.stgmedium.pUnkForRelease = null; |
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114 transferData.result = COM.S_OK; |
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115 break; |
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116 } |
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117 } |
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118 return; |
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119 } |
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120 |
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121 /** |
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122 * This implementation of <code>nativeToJava</code> converts a platform specific |
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123 * representation of plain text to a java <code>String</code>. |
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124 * |
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125 * @param transferData the platform specific representation of the data to be converted |
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126 * @return a java <code>String</code> containing text if the conversion was successful; otherwise null |
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127 * |
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128 * @see Transfer#nativeToJava |
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129 */ |
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130 public Object nativeToJava(TransferData transferData){ |
142 | 131 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null; |
135
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132 |
142 | 133 IDataObject data = transferData.pIDataObject; |
135
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134 data.AddRef(); |
142 | 135 FORMATETC* formatetc = transferData.formatetc; |
136 STGMEDIUM* stgmedium = new STGMEDIUM(); | |
135
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137 stgmedium.tymed = COM.TYMED_HGLOBAL; |
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138 transferData.result = data.GetData(formatetc, stgmedium); |
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139 data.Release(); |
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140 if (transferData.result !is COM.S_OK) return null; |
142 | 141 auto hMem = stgmedium.unionField; |
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142 try { |
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143 switch (transferData.type) { |
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144 case CF_UNICODETEXTID: { |
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145 /* Ensure byteCount is a multiple of 2 bytes */ |
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146 int size = OS.GlobalSize(hMem) / 2 * 2; |
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147 if (size is 0) return null; |
142 | 148 wchar[] chars = new wchar[size/2]; |
149 auto ptr = OS.GlobalLock(hMem); | |
150 if (ptr is null) return null; | |
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151 try { |
142 | 152 OS.MoveMemory(chars.ptr, ptr, size); |
153 int length_ = chars.length; | |
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154 for (int i=0; i<chars.length; i++) { |
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155 if (chars [i] is '\0') { |
142 | 156 length_ = i; |
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157 break; |
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158 } |
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159 } |
142 | 160 return new ArrayWrapperString (WCHARsToStr(chars[ 0 .. length_])); |
135
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161 } finally { |
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162 OS.GlobalUnlock(hMem); |
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163 } |
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164 } |
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165 case CF_TEXTID: { |
142 | 166 auto lpMultiByteStr = cast(char*)OS.GlobalLock(hMem); |
167 if (lpMultiByteStr is null) return null; | |
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168 try { |
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169 int codePage = OS.GetACP(); |
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170 int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); |
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171 if (cchWideChar is 0) return null; |
142 | 172 wchar[] lpWideCharStr = new wchar [cchWideChar - 1]; |
173 OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length); | |
174 return new ArrayWrapperString( WCHARzToStr(lpWideCharStr.ptr)); | |
135
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175 } finally { |
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176 OS.GlobalUnlock(hMem); |
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177 } |
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178 } |
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179 } |
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180 } finally { |
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181 OS.GlobalFree(hMem); |
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182 } |
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183 return null; |
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184 } |
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185 |
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186 protected int[] getTypeIds(){ |
142 | 187 return [CF_UNICODETEXTID, CF_TEXTID]; |
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188 } |
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189 |
142 | 190 protected char[][] getTypeNames(){ |
191 return [CF_UNICODETEXT, CF_TEXT]; | |
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192 } |
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193 |
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194 bool checkText(Object object) { |
142 | 195 if( auto s = cast(ArrayWrapperString)object ){ |
196 return s.array.length > 0; | |
197 } | |
198 return false; | |
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199 } |
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200 |
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201 protected bool validate(Object object) { |
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202 return checkText(object); |
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203 } |
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204 } |