Mercurial > projects > dwt-win
annotate dwt/dnd/HTMLTransfer.d @ 140:127a3e1fca05
HTMLTransfer
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 13 Feb 2008 16:03:59 +0100 |
parents | 242e33c0e383 |
children | 184ab53b7785 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2006 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; |
140 | 16 import dwt.internal.ole.win32.OBJIDL; |
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17 import dwt.internal.win32.OS; |
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18 |
140 | 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>HTMLTransfer</code> provides a platform specific mechanism |
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30 * for converting text in HTML format represented as a java <code>String</code> |
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31 * to a platform specific representation of the data and vice versa. See |
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32 * <code>Transfer</code> for additional information. |
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33 * |
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34 * <p>An example of a java <code>String</code> containing HTML text is shown |
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35 * below:</p> |
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36 * |
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37 * <code><pre> |
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38 * String htmlData = "<p>This is a paragraph of text.</p>"; |
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39 * </code></pre> |
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40 */ |
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41 public class HTMLTransfer : ByteArrayTransfer { |
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42 |
140 | 43 static HTMLTransfer _instance; |
44 static const char[] HTML_FORMAT = "HTML Format"; //$NON-NLS-1$ | |
45 static const int HTML_FORMATID; | |
46 static const char[] NUMBER = "00000000"; //$NON-NLS-1$ | |
47 static const char[] HEADER = "Version:0.9\r\nStartHTML:"~NUMBER~"\r\nEndHTML:"~NUMBER~"\r\nStartFragment:"~NUMBER~"\r\nEndFragment:"~NUMBER~"\r\n"; | |
48 static const char[] PREFIX = "<html><body><!--StartFragment-->"; //$NON-NLS-1$ | |
49 static const char[] SUFFIX = "<!--EndFragment--></body></html>"; //$NON-NLS-1$ | |
50 static const char[] StartFragment = "StartFragment:"; //$NON-NLS-1$ | |
51 static const char[] EndFragment = "EndFragment:"; //$NON-NLS-1$ | |
52 | |
53 static this(){ | |
54 HTML_FORMATID = registerType(HTML_FORMAT); | |
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 () { |
140 | 65 if( _instance is null ){ |
66 synchronized { | |
67 if( _instance is null ){ | |
68 _instance = new HTMLTransfer(); | |
69 } | |
70 } | |
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 * For additional information see <code>Transfer#javaToNative</code>. |
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79 * |
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80 * @param object a java <code>String</code> containing HTML text |
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81 * @param transferData an empty <code>TransferData</code> object; this |
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82 * object will be filled in on return with the platform specific format of the data |
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83 */ |
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84 public void javaToNative (Object object, TransferData transferData){ |
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85 if (!checkHTML(object) || !isSupportedType(transferData)) { |
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86 DND.error(DND.ERROR_INVALID_DATA); |
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87 } |
140 | 88 char[] string = ( cast(ArrayWrapperString)object ).array; |
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89 int codePage = OS.GetACP(); |
140 | 90 int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, StrToTCHARz(string), -1, null, 0, null, null); |
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91 if (cchMultiByte is 0) { |
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92 transferData.stgmedium = new STGMEDIUM(); |
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93 transferData.result = COM.DV_E_STGMEDIUM; |
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94 return; |
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95 } |
140 | 96 int startHTML = HEADER.length; |
97 int startFragment = startHTML + PREFIX.length; | |
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98 int endFragment = startFragment + cchMultiByte - 1; |
140 | 99 int endHTML = endFragment + SUFFIX.length; |
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100 |
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101 StringBuffer buffer = new StringBuffer(HEADER); |
140 | 102 int maxLength = NUMBER.length; |
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103 //startHTML |
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104 int start = buffer.toString().indexOf(NUMBER); |
140 | 105 char[] temp = Integer.toString(startHTML); |
106 buffer.select(start + maxLength-temp.length, temp.length); | |
107 buffer.replace(temp); | |
108 buffer.select(); | |
109 | |
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110 //endHTML |
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111 start = buffer.toString().indexOf(NUMBER, start); |
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112 temp = Integer.toString(endHTML); |
140 | 113 buffer.select(start + maxLength-temp.length, temp.length); |
114 buffer.replace( temp); | |
115 buffer.select(); | |
116 | |
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117 //startFragment |
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118 start = buffer.toString().indexOf(NUMBER, start); |
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119 temp = Integer.toString(startFragment); |
140 | 120 buffer.select(start + maxLength-temp.length, temp.length); |
121 buffer.replace(temp); | |
122 buffer.select(); | |
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123 //endFragment |
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124 start = buffer.toString().indexOf(NUMBER, start); |
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125 temp = Integer.toString(endFragment); |
140 | 126 buffer.select(start + maxLength-temp.length, temp.length); |
127 buffer.replace(temp); | |
128 buffer.select(); | |
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129 |
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130 buffer.append(PREFIX); |
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131 buffer.append(string); |
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132 buffer.append(SUFFIX); |
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133 |
140 | 134 auto wstrz = StrToTCHARz(codePage,buffer.toString); |
135 cchMultiByte = OS.WideCharToMultiByte(codePage, 0, wstrz, -1, null, 0, null, null); | |
136 auto lpMultiByteStr = cast(char*) OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte); | |
137 OS.WideCharToMultiByte(codePage, 0, wstrz, -1, lpMultiByteStr, cchMultiByte, null, null); | |
135
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138 transferData.stgmedium = new STGMEDIUM(); |
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139 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
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140 transferData.stgmedium.unionField = lpMultiByteStr; |
140 | 141 transferData.stgmedium.pUnkForRelease = null; |
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142 transferData.result = COM.S_OK; |
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143 return; |
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144 } |
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145 |
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146 /** |
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147 * This implementation of <code>nativeToJava</code> converts a platform specific |
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148 * representation of HTML text to a java <code>String</code>. |
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149 * For additional information see <code>Transfer#nativeToJava</code>. |
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150 * |
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151 * @param transferData the platform specific representation of the data to be |
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152 * been converted |
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153 * @return a java <code>String</code> containing HTML text if the |
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154 * conversion was successful; otherwise null |
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155 */ |
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156 public Object nativeToJava(TransferData transferData){ |
140 | 157 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null; |
158 IDataObject data = transferData.pIDataObject; | |
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159 data.AddRef(); |
140 | 160 STGMEDIUM* stgmedium = new STGMEDIUM(); |
161 FORMATETC* formatetc = transferData.formatetc; | |
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162 stgmedium.tymed = COM.TYMED_HGLOBAL; |
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163 transferData.result = data.GetData(formatetc, stgmedium); |
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164 data.Release(); |
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165 if (transferData.result !is COM.S_OK) return null; |
140 | 166 auto hMem = stgmedium.unionField; |
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167 |
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168 try { |
140 | 169 auto lpMultiByteStr = cast(char*) OS.GlobalLock(hMem); |
170 if (lpMultiByteStr is null) return null; | |
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171 try { |
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172 int codePage = OS.GetACP(); |
140 | 173 auto cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0); |
135
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174 if (cchWideChar is 0) return null; |
140 | 175 wchar[] lpWideCharStr = new wchar [cchWideChar - 1]; |
176 OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr.ptr, lpWideCharStr.length); | |
177 char[] string = WCHARzToStr(lpWideCharStr.ptr); | |
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178 int fragmentStart = 0, fragmentEnd = 0; |
140 | 179 int start = string.indexOf(StartFragment) + StartFragment.length; |
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180 int end = start + 1; |
140 | 181 while (end < string.length) { |
182 char[] s = string.substring(start, end); | |
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183 try { |
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184 fragmentStart = Integer.parseInt(s); |
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185 end++; |
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186 } catch (NumberFormatException e) { |
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187 break; |
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188 } |
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189 } |
140 | 190 start = string.indexOf(EndFragment) + EndFragment.length; |
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191 end = start + 1; |
140 | 192 while (end < string.length) { |
193 char[] s = string.substring(start, end); | |
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194 try { |
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195 fragmentEnd = Integer.parseInt(s); |
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196 end++; |
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197 } catch (NumberFormatException e) { |
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198 break; |
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199 } |
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200 } |
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201 if (fragmentEnd <= fragmentStart || fragmentEnd > lpWideCharStr.length) return null; |
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202 /* TO DO: |
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203 * FragmentStart and FragmentEnd are offsets in original byte stream, not |
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204 * the wide char version of the byte stream. |
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205 */ |
140 | 206 char[] s = string.substring(fragmentStart, fragmentEnd); |
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207 /* |
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208 * Firefox includes <!--StartFragment --> in the fragment, so remove it. |
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209 */ |
140 | 210 char[] foxStart = "<!--StartFragment -->\r\n"; //$NON-NLS-1$ |
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211 int prefix = s.indexOf(foxStart); |
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212 if (prefix !is -1) { |
140 | 213 prefix += foxStart.length; |
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214 s = s.substring(prefix); |
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215 } |
140 | 216 return new ArrayWrapperString(s); |
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217 } finally { |
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218 OS.GlobalUnlock(hMem); |
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219 } |
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220 } finally { |
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221 OS.GlobalFree(hMem); |
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222 } |
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223 } |
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224 protected int[] getTypeIds(){ |
140 | 225 return [HTML_FORMATID]; |
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226 } |
140 | 227 protected char[][] getTypeNames(){ |
228 return [HTML_FORMAT]; | |
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229 } |
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230 bool checkHTML(Object object) { |
140 | 231 if( auto ws = cast(ArrayWrapperString)object ){ |
232 return ws.array.length > 0; | |
233 } | |
234 return false; | |
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235 } |
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236 protected bool validate(Object object) { |
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237 return checkHTML(object); |
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238 } |
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239 } |