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annotate dwt/dnd/HTMLTransfer.d @ 320:da968414c383

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Merge changes SWT 3.4.1
author Frank Benoit <benoit@tionex.de>
date Mon, 03 Nov 2008 21:58:40 +0100
parents fbb9174f2a2c
children
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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.HTMLTransfer;
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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 * The class <code>HTMLTransfer</code> provides a platform specific mechanism
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29 * for converting text in HTML format represented as a java <code>String</code>
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30 * to a platform specific representation of the data and vice versa.
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31 *
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32 * <p>An example of a java <code>String</code> containing HTML text is shown
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33 * below:</p>
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34 *
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35 * <code><pre>
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36 * String htmlData = "<p>This is a paragraph of text.</p>";
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37 * </code></pre>
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38 *
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39 * @see Transfer
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40 */
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41 public class HTMLTransfer : ByteArrayTransfer {
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42
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43 static HTMLTransfer _instance;
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44 static const String HTML_FORMAT = "HTML Format"; //$NON-NLS-1$
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45 static const int HTML_FORMATID;
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46 static const String NUMBER = "00000000"; //$NON-NLS-1$
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47 static const String HEADER = "Version:0.9\r\nStartHTML:"~NUMBER~"\r\nEndHTML:"~NUMBER~"\r\nStartFragment:"~NUMBER~"\r\nEndFragment:"~NUMBER~"\r\n";
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48 static const String PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$
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49 static const String SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$
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50 static const String StartFragment = "StartFragment:"; //$NON-NLS-1$
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51 static const String EndFragment = "EndFragment:"; //$NON-NLS-1$
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52
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53 static this(){
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54 HTML_FORMATID = registerType(HTML_FORMAT);
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55 }
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56
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57 private this() {}
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58
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59 /**
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60 * Returns the singleton instance of the HTMLTransfer class.
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61 *
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62 * @return the singleton instance of the HTMLTransfer class
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63 */
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64 public static HTMLTransfer getInstance () {
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65 if( _instance is null ){
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66 synchronized {
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67 if( _instance is null ){
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68 _instance = new HTMLTransfer();
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69 }
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70 }
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71 }
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72 return _instance;
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73 }
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74
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75 /**
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76 * This implementation of <code>javaToNative</code> converts HTML-formatted text
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77 * represented by a java <code>String</code> to a platform specific representation.
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78 *
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79 * @param object a java <code>String</code> containing HTML text
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80 * @param transferData an empty <code>TransferData</code> object that will
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81 * be filled in on return with the platform specific format of the data
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82 *
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83 * @see Transfer#nativeToJava
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84 */
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85 public void javaToNative (Object object, TransferData transferData){
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86 if (!checkHTML(object) || !isSupportedType(transferData)) {
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87 DND.error(DND.ERROR_INVALID_DATA);
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88 }
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89 String string = ( cast(ArrayWrapperString)object ).array;
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90 /* NOTE: CF_HTML uses UTF-8 encoding. */
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91 int cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, StrToTCHARz(string), -1, null, 0, null, null);
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92 if (cchMultiByte is 0) {
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93 transferData.stgmedium = new STGMEDIUM();
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94 transferData.result = COM.DV_E_STGMEDIUM;
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95 return;
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96 }
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97 int startHTML = HEADER.length;
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98 int startFragment = startHTML + PREFIX.length;
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99 int endFragment = startFragment + cchMultiByte - 1;
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100 int endHTML = endFragment + SUFFIX.length;
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101
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102 StringBuffer buffer = new StringBuffer(HEADER);
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103 int maxLength = NUMBER.length;
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104 //startHTML
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105 int start = buffer.toString().indexOf(NUMBER);
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106 String temp = Integer.toString(startHTML);
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107 buffer.select(start + maxLength-temp.length, temp.length);
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108 buffer.replace(temp);
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109 buffer.select();
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110
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111 //endHTML
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112 start = buffer.toString().indexOf(NUMBER, start);
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113 temp = Integer.toString(endHTML);
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114 buffer.select(start + maxLength-temp.length, temp.length);
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115 buffer.replace( temp);
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116 buffer.select();
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117
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118 //startFragment
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119 start = buffer.toString().indexOf(NUMBER, start);
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120 temp = Integer.toString(startFragment);
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121 buffer.select(start + maxLength-temp.length, temp.length);
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122 buffer.replace(temp);
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123 buffer.select();
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124 //endFragment
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125 start = buffer.toString().indexOf(NUMBER, start);
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126 temp = Integer.toString(endFragment);
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127 buffer.select(start + maxLength-temp.length, temp.length);
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128 buffer.replace(temp);
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129 buffer.select();
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131 buffer.append(PREFIX);
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132 buffer.append(string);
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133 buffer.append(SUFFIX);
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134
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135 auto wstrz = StrToTCHARz(OS.CP_UTF8,buffer.toString);
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136 cchMultiByte = OS.WideCharToMultiByte(OS.CP_UTF8, 0, wstrz, -1, null, 0, null, null);
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137 auto lpMultiByteStr = cast(PCHAR) OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
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138 OS.WideCharToMultiByte(OS.CP_UTF8, 0, wstrz, -1, lpMultiByteStr, cchMultiByte, null, null);
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139 transferData.stgmedium = new STGMEDIUM();
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140 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
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141 transferData.stgmedium.unionField = lpMultiByteStr;
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142 transferData.stgmedium.pUnkForRelease = null;
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143 transferData.result = COM.S_OK;
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144 return;
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145 }
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146
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147 /**
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148 * This implementation of <code>nativeToJava</code> converts a platform specific
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149 * representation of HTML text to a java <code>String</code>.
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150 *
246
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151 * @param transferData the platform specific representation of the data to be converted
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152 * @return a java <code>String</code> containing HTML text if the conversion was successful;
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153 * otherwise null
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154 *
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155 * @see Transfer#javaToNative
135
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156 */
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157 public Object nativeToJava(TransferData transferData){
140
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158 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null;
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159 IDataObject data = transferData.pIDataObject;
135
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160 data.AddRef();
140
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161 STGMEDIUM* stgmedium = new STGMEDIUM();
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162 FORMATETC* formatetc = transferData.formatetc;
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163 stgmedium.tymed = COM.TYMED_HGLOBAL;
320
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164 transferData.result = getData(data, formatetc, stgmedium);
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165 data.Release();
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166 if (transferData.result !is COM.S_OK) return null;
140
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167 auto hMem = stgmedium.unionField;
135
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168
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169 try {
253
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170 auto lpMultiByteStr = cast(PCHAR) OS.GlobalLock(hMem);
140
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171 if (lpMultiByteStr is null) return null;
135
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172 try {
213
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173 /* NOTE: CF_HTML uses UTF-8 encoding.
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174 * The MSDN documentation for MultiByteToWideChar states that dwFlags must be set to 0 for UTF-8.
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175 * Otherwise, the function fails with ERROR_INVALID_FLAGS. */
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176 auto cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, null, 0);
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177 if (cchWideChar is 0) return null;
140
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178 wchar[] lpWideCharStr = new wchar [cchWideChar - 1];
213
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179 OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length);
212
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180 String string = WCHARzToStr(lpWideCharStr.ptr);
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181 int fragmentStart = 0, fragmentEnd = 0;
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182 int start = string.indexOf(StartFragment) + StartFragment.length;
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183 int end = start + 1;
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184 while (end < string.length) {
212
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185 String s = string.substring(start, end);
135
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186 try {
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187 fragmentStart = Integer.parseInt(s);
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188 end++;
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189 } catch (NumberFormatException e) {
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190 break;
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191 }
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192 }
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193 start = string.indexOf(EndFragment) + EndFragment.length;
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194 end = start + 1;
140
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195 while (end < string.length) {
212
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196 String s = string.substring(start, end);
135
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197 try {
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198 fragmentEnd = Integer.parseInt(s);
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199 end++;
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200 } catch (NumberFormatException e) {
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201 break;
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202 }
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203 }
213
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204 if (fragmentEnd <= fragmentStart || fragmentEnd > OS.strlen(lpMultiByteStr)) return null;
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205 cchWideChar = OS.MultiByteToWideChar (OS.CP_UTF8, 0, lpMultiByteStr+fragmentStart, fragmentEnd - fragmentStart, lpWideCharStr.ptr, lpWideCharStr.length);
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206 if (cchWideChar is 0) return null;
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207 String s = TCHARsToStr( lpWideCharStr[ 0 .. cchWideChar ] );
135
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208 /*
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209 * Firefox includes <!--StartFragment --> in the fragment, so remove it.
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210 */
212
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211 String foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$
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212 int prefix = s.indexOf(foxStart);
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213 if (prefix !is -1) {
140
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214 prefix += foxStart.length;
135
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215 s = s.substring(prefix);
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216 }
140
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217 return new ArrayWrapperString(s);
135
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218 } finally {
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219 OS.GlobalUnlock(hMem);
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220 }
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221 } finally {
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222 OS.GlobalFree(hMem);
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223 }
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224 }
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225 protected int[] getTypeIds(){
140
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226 return [HTML_FORMATID];
135
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227 }
212
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228 protected String[] getTypeNames(){
140
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diff changeset
229 return [HTML_FORMAT];
135
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230 }
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231 bool checkHTML(Object object) {
140
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diff changeset
232 if( auto ws = cast(ArrayWrapperString)object ){
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diff changeset
233 return ws.array.length > 0;
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diff changeset
234 }
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diff changeset
235 return false;
135
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236 }
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237 protected bool validate(Object object) {
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238 return checkHTML(object);
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239 }
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parents:
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240 }