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annotate dwt/dnd/URLTransfer.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 fd9c62a2998e
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 20007 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.URLTransfer;
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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>URLTransfer</code> provides a platform specific mechanism
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29 * for converting text in URL format represented as a java <code>String</code>
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30 * to a platform specific representation of the data and vice versa. The string
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31 * must contain a fully specified url.
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32 *
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33 * <p>An example of a java <code>String</code> containing a URL is shown below:</p>
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34 *
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35 * <code><pre>
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36 * String url = "http://www.eclipse.org";
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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 URLTransfer : ByteArrayTransfer {
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42
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43 static URLTransfer _instance;
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44 static const String CFSTR_INETURL = "UniformResourceLocator"; //$NON-NLS-1$
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45 static const int CFSTR_INETURLID;
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46
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47 static this(){
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48 CFSTR_INETURLID = registerType(CFSTR_INETURL);
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49 }
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50
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51 private this() {}
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52
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53 /**
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54 * Returns the singleton instance of the URLTransfer class.
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55 *
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56 * @return the singleton instance of the URLTransfer class
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57 */
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58 public static URLTransfer getInstance () {
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59 if( _instance is null ){
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60 synchronized {
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61 if( _instance is null ){
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62 _instance = new URLTransfer();
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63 }
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64 }
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65 }
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66 return _instance;
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67 }
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68
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69 /**
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70 * This implementation of <code>javaToNative</code> converts a URL
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71 * represented by a java <code>String</code> to a platform specific representation.
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72 *
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73 * @param object a java <code>String</code> containing a URL
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74 * @param transferData an empty <code>TransferData</code> object that will
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75 * be filled in on return with the platform specific format of the data
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76 *
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77 * @see Transfer#nativeToJava
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78 */
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79 public void javaToNative (Object object, TransferData transferData){
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80 if (!checkURL(object) || !isSupportedType(transferData)) {
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81 DND.error(DND.ERROR_INVALID_DATA);
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82 }
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83 transferData.result = COM.E_FAIL;
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84 // URL is stored as a null terminated byte array
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85 String url = (cast(ArrayWrapperString)object).array;
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86 int codePage = OS.GetACP();
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87 wchar[] chars = StrToWCHARs(codePage, url, true );
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88 int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars.ptr, -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(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
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95 OS.WideCharToMultiByte(codePage, 0, chars.ptr, -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
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106 * specific representation of a URL 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 a URL 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 = getData(data, 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(){
145
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144 return [CFSTR_INETURLID];
135
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145 }
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146
212
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147 protected String[] getTypeNames(){
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148 return [CFSTR_INETURL];
135
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149 }
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150
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151 bool checkURL(Object object) {
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152 return object !is null && (null !is cast(ArrayWrapperString)object) && (cast(ArrayWrapperString)object).array.length > 0;
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153
135
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154 }
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155
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156 protected bool validate(Object object) {
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157 return checkURL(object);
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158 }
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159 }