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annotate dwt/dnd/RTFTransfer.d @ 246:fd9c62a2998e

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Updater SWT 3.4M7 to 3.4
author Frank Benoit <benoit@tionex.de>
date Tue, 01 Jul 2008 10:15:59 +0200
parents e2affbeb686d
children fbb9174f2a2c
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.RTFTransfer;
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14
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15 import dwt.internal.ole.win32.COM;
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16 import dwt.internal.ole.win32.OBJIDL;
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17 import dwt.internal.win32.OS;
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18
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19 import dwt.dnd.ByteArrayTransfer;
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20 import dwt.dnd.TransferData;
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21 import dwt.dnd.DND;
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22
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23 import dwt.dwthelper.utils;
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24 static import tango.text.Text;
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25 alias tango.text.Text.Text!(char) StringBuffer;
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26
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27
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28 /**
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29 * The class <code>RTFTransfer</code> provides a platform specific mechanism
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30 * for converting text in RTF format 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 RTF 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 rtfData = "{\\rtf1{\\colortbl;\\red255\\green0\\blue0;}\\uc1\\b\\i 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 RTFTransfer : ByteArrayTransfer {
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43
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44 private static RTFTransfer _instance;
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45 private static const String CF_RTF = "Rich Text Format"; //$NON-NLS-1$
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46 private static const int CF_RTFID;
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47
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48 static this(){
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49 CF_RTFID = registerType(CF_RTF);
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50 }
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51
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52 private this() {}
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53
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54 /**
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55 * Returns the singleton instance of the RTFTransfer class.
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56 *
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57 * @return the singleton instance of the RTFTransfer class
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58 */
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59 public static RTFTransfer getInstance () {
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60 if( _instance is null ){
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61 synchronized {
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62 if( _instance is null ){
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63 _instance = new RTFTransfer();
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64 }
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65 }
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66 }
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67 return _instance;
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68 }
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69
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70 /**
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71 * This implementation of <code>javaToNative</code> converts RTF-formatted text
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72 * represented by a java <code>String</code> to a platform specific representation.
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73 *
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74 * @param object a java <code>String</code> containing RTF text
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75 * @param transferData an empty <code>TransferData</code> object that will
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76 * be filled in on return with the platform specific format of the data
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77 *
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78 * @see Transfer#nativeToJava
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79 */
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80 public void javaToNative (Object object, TransferData transferData){
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81 if (!checkRTF(object) || !isSupportedType(transferData)) {
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82 DND.error(DND.ERROR_INVALID_DATA);
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83 }
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84 // CF_RTF is stored as a null terminated byte array
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85 String string = (cast(ArrayWrapperString)object).array;
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86 wchar* chars = StrToWCHARz(string);
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87 int codePage = OS.GetACP();
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88 int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null);
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89 if (cchMultiByte is 0) {
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90 transferData.stgmedium = new STGMEDIUM();
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91 transferData.result = COM.DV_E_STGMEDIUM;
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92 return;
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93 }
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94 auto lpMultiByteStr = cast(CHAR*)OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, cchMultiByte);
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95 OS.WideCharToMultiByte(codePage, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);
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96 transferData.stgmedium = new STGMEDIUM();
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97 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
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98 transferData.stgmedium.unionField = lpMultiByteStr;
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99 transferData.stgmedium.pUnkForRelease = null;
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100 transferData.result = COM.S_OK;
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101 return;
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102 }
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103
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104 /**
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105 * This implementation of <code>nativeToJava</code> converts a platform specific
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106 * representation of RTF text to a java <code>String</code>.
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107 *
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108 * @param transferData the platform specific representation of the data to be converted
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109 * @return a java <code>String</code> containing RTF text if the conversion was successful;
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110 * otherwise null
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111 *
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112 * @see Transfer#javaToNative
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113 */
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114 public Object nativeToJava(TransferData transferData){
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115 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null;
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116 IDataObject data = transferData.pIDataObject;
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117 data.AddRef();
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118 STGMEDIUM* stgmedium = new STGMEDIUM();
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119 FORMATETC* formatetc = transferData.formatetc;
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120 stgmedium.tymed = COM.TYMED_HGLOBAL;
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121 transferData.result = data.GetData(formatetc, stgmedium);
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122 data.Release();
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123 if (transferData.result !is COM.S_OK) return null;
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124 auto hMem = stgmedium.unionField;
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125 try {
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126 auto lpMultiByteStr = cast(CHAR*) OS.GlobalLock(hMem);
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127 if (lpMultiByteStr is null) return null;
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128 try {
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129 int codePage = OS.GetACP();
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130 int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0);
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131 if (cchWideChar is 0) return null;
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132 wchar[] lpWideCharStr = new wchar [cchWideChar - 1];
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133 OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length);
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134 return new ArrayWrapperString( WCHARzToStr(lpWideCharStr.ptr));
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135 } finally {
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136 OS.GlobalUnlock(hMem);
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137 }
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138 } finally {
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139 OS.GlobalFree(hMem);
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140 }
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141 }
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142
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143 protected int[] getTypeIds(){
141
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144 return [CF_RTFID];
135
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145 }
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146
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147 protected String[] getTypeNames(){
141
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148 return [CF_RTF];
135
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149 }
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150
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151 bool checkRTF(Object object) {
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152 if( auto s = cast(ArrayWrapperString)object ){
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153 return s.array.length > 0 ;
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154 }
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155 return false;
135
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156 }
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157
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158 protected bool validate(Object object) {
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159 return checkRTF(object);
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160 }
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161 }