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annotate dwt/dnd/OleEnumFORMATETC.d @ 139:18847a0560e9

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OleEnumFORMATETC
author Frank Benoit <benoit@tionex.de>
date Wed, 13 Feb 2008 15:27:57 +0100
parents 242e33c0e383
children 36f5cb12e1a2
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135
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2003 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.OleEnumFORMATETC;
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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.ole.win32.extras;
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18
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19 final class OleEnumFORMATETC {
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20
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21 private _IEnumFORMATETCImpl iEnumFORMATETC;
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22
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23 private int refCount;
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24 private int index;
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25
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26 private FORMATETC*[] formats;
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27
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28 this() {
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29
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30 createCOMInterfaces();
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31
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32 }
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33 int AddRef() {
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34 refCount++;
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35 return refCount;
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36 }
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37 private void createCOMInterfaces() {
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38 // register each of the interfaces that this object implements
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39 iEnumFORMATETC = new _IEnumFORMATETCImpl( this );
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40 }
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41 private void disposeCOMInterfaces() {
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42 iEnumFORMATETC = null;
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43 }
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44 IEnumFORMATETC getAddress() {
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45 return iEnumFORMATETC;
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46 }
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47 private FORMATETC*[] getNextItems(int numItems){
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48
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49 if (formats is null || numItems < 1) return null;
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50
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51 int endIndex = index + numItems - 1;
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52 if (endIndex > (formats.length - 1)) endIndex = formats.length - 1;
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53 if (index > endIndex) return null;
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54
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55 FORMATETC*[] items = new FORMATETC*[endIndex - index + 1];
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56 for (int i = 0; i < items.length; i++){
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57 items[i] = formats[index];
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58 index++;
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59 }
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60
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61 return items;
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62 }
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63
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64 package HRESULT Next(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched) {
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65 /* Retrieves the next celt items in the enumeration sequence.
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66 If there are fewer than the requested number of elements left in the sequence,
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67 it retrieves the remaining elements.
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68 The number of elements actually retrieved is returned through pceltFetched
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69 (unless the caller passed in NULL for that parameter).
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70 */
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71
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72 if (rgelt is null) return COM.E_INVALIDARG;
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73 if (pceltFetched is null && celt !is 1) return COM.E_INVALIDARG;
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74
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75 FORMATETC*[] nextItems = getNextItems(celt);
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76 if (nextItems !is null) {
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77 for (int i = 0; i < nextItems.length; i++) {
139
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78 rgelt[i] = *nextItems[i];
135
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79 }
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80
139
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81 if (pceltFetched !is null)
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82 *pceltFetched = nextItems.length;
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83
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84 if (nextItems.length is celt) return COM.S_OK;
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85
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86 } else {
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87 if (pceltFetched !is null)
135
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88 *pceltFetched = 0;
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89 COM.MoveMemory(rgelt, & FORMATETC.init, FORMATETC.sizeof);
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90
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91 }
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92 return COM.S_FALSE;
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93 }
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94 private HRESULT QueryInterface(REFIID riid, void** ppvObject) {
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95
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96 if (riid is null || ppvObject is null) return COM.E_NOINTERFACE;
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97
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98 if (COM.IsEqualGUID(riid, &COM.IIDIUnknown)) {
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99 *ppvObject = cast(void*)cast(IUnknown)iEnumFORMATETC;
135
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100 AddRef();
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101 return COM.S_OK;
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102 }
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103 if (COM.IsEqualGUID(riid, &COM.IIDIEnumFORMATETC)) {
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104 *ppvObject = cast(void*)cast(IEnumFORMATETC)iEnumFORMATETC;
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105 AddRef();
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106 return COM.S_OK;
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107 }
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108 *ppvObject = null;
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109 return COM.E_NOINTERFACE;
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110 }
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111 int Release() {
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112 refCount--;
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113
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114 if (refCount is 0) {
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115 disposeCOMInterfaces();
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116 COM.CoFreeUnusedLibraries();
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117 }
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118
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119 return refCount;
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120 }
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121 private int Reset() {
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122 //Resets the enumeration sequence to the beginning.
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123 index = 0;
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124 return COM.S_OK;
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125 }
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126 void setFormats(FORMATETC*[] newFormats) {
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127 formats = newFormats;
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128 index = 0;
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129 }
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130 private int Skip(int celt) {
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131 //Skips over the next specified number of elements in the enumeration sequence.
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132 if (celt < 1 ) return COM.E_INVALIDARG;
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133
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134 index += celt;
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135 if (index > (formats.length - 1)){
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136 index = formats.length - 1;
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137 return COM.S_FALSE;
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138 }
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139 return COM.S_OK;
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140 }
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141 }
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142
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143 class _IEnumFORMATETCImpl : IEnumFORMATETC {
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144
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145
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146 OleEnumFORMATETC parent;
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147 this(OleEnumFORMATETC p) { parent = p; }
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148 extern (Windows):
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149 // interface of IUnknown
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150 HRESULT QueryInterface(REFIID riid, void ** ppvObject) { return parent.QueryInterface(riid, ppvObject); }
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151 ULONG AddRef() { return parent.AddRef(); }
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152 ULONG Release() { return parent.Release(); }
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153
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154 // interface of IEnumFORMATETC
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155 HRESULT Next(ULONG celt, FORMATETC *rgelt, ULONG *pceltFetched) {
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156 return parent.Next(celt, rgelt, pceltFetched);
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157 }
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158 HRESULT Skip(ULONG celt) { return parent.Skip(celt); }
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159 HRESULT Reset() { return parent.Reset(); }
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160 HRESULT Clone(IEnumFORMATETC * ppenum) { return COM.E_NOTIMPL;}
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161 }
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162
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163