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annotate dwt/dnd/Transfer.d @ 212:ab60f3309436

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reverted the char[] to String and use the an alias.
author Frank Benoit <benoit@tionex.de>
date Mon, 05 May 2008 00:12:38 +0200
parents 04e357b8343d
children fd9c62a2998e
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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.Transfer;
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14
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15
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16 import dwt.internal.win32.OS;
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17
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18 import dwt.dnd.TransferData;
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19 import dwt.dwthelper.utils;
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20
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21 /**
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22 * <code>Transfer</code> provides a mechanism for converting between a java
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23 * representation of data and a platform specific representation of data and
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24 * vice versa. It is used in data transfer operations such as drag and drop and
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25 * clipboard copy/paste.
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26 *
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27 * <p>You should only need to become familiar with this class if you are
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28 * implementing a Transfer subclass and you are unable to subclass the
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29 * ByteArrayTransfer class.</p>
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30 *
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31 * @see ByteArrayTransfer
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32 */
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33 public abstract class Transfer {
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34
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35 /**
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36 * Returns a list of the platform specific data types that can be converted using
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37 * this transfer agent.
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38 *
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39 * <p>Only the data type fields of the <code>TransferData</code> objects are filled
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40 * in.</p>
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41 *
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42 * @return a list of the data types that can be converted using this transfer agent
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43 */
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44 abstract public TransferData[] getSupportedTypes();
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45
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46 /**
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47 * Returns true if the <code>TransferData</code> data type can be converted
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48 * using this transfer agent, or false otherwise (including if transferData is
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49 * <code>null</code>).
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50 *
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51 * @param transferData a platform specific description of a data type; only the data
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52 * type fields of the <code>TransferData</code> object need to be filled in
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53 *
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54 * @return true if the transferData data type can be converted using this transfer
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55 * agent
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56 */
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57 abstract public bool isSupportedType(TransferData transferData);
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58
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59 /**
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60 * Returns the platform specific ids of the data types that can be converted using
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61 * this transfer agent.
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62 *
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63 * @return the platform specific ids of the data types that can be converted using
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64 * this transfer agent
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65 */
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66 abstract protected int[] getTypeIds();
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67
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68 /**
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69 * Returns the platform specific names of the data types that can be converted
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70 * using this transfer agent.
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71 *
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72 * @return the platform specific names of the data types that can be converted
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73 * using this transfer agent.
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74 */
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75 abstract protected String[] getTypeNames();
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76
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77 /**
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78 * Converts a java representation of data to a platform specific representation of
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79 * the data.
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80 *
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81 * <p>On a successful conversion, the transferData.result field will be set as follows:
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82 * <ul>
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83 * <li>Windows: COM.S_OK
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84 * <li>Motif: 1
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85 * <li>GTK: 1
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86 * <li>Photon: 1
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87 * </ul></p>
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88 *
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89 * <p>If this transfer agent is unable to perform the conversion, the transferData.result
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90 * field will be set to a failure value as follows:
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91 * <ul>
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92 * <li>Windows: COM.DV_E_TYMED or COM.E_FAIL
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93 * <li>Motif: 0
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94 * <li>GTK: 0
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95 * <li>Photon: 0
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96 * </ul></p>
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97 *
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98 * @param object a java representation of the data to be converted; the type of
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99 * Object that is passed in is dependent on the <code>Transfer</code> subclass.
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100 *
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101 * @param transferData an empty TransferData object; this object will be
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102 * filled in on return with the platform specific representation of the data
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103 *
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104 * @exception dwt.DWTException <ul>
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105 * <li>ERROR_INVALID_DATA - if object does not contain data in a valid format or is <code>null</code></li>
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106 * </ul>
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107 */
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108 abstract public void javaToNative (Object object, TransferData transferData);
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109
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110 /**
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111 * Converts a platform specific representation of data to a java representation.
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112 *
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113 * @param transferData the platform specific representation of the data to be
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114 * converted
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115 *
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116 * @return a java representation of the converted data if the conversion was
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117 * successful; otherwise null. If transferData is <code>null</code> then
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118 * <code>null</code> is returned. The type of Object that is returned is
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119 * dependent on the <code>Transfer</code> subclass.
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120 */
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121 abstract public Object nativeToJava(TransferData transferData);
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122
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123 /**
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124 * Registers a name for a data type and returns the associated unique identifier.
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125 *
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126 * <p>You may register the same type more than once, the same unique identifier
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127 * will be returned if the type has been previously registered.</p>
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128 *
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129 * <p>Note: On windows, do <b>not</b> call this method with pre-defined
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130 * Clipboard Format types such as CF_TEXT or CF_BITMAP because the
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131 * pre-defined identifier will not be returned</p>
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132 *
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133 * @param formatName the name of a data type
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134 *
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135 * @return the unique identifier associated with this data type
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136 */
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137 public static int registerType(String formatName) {
135
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138 // Look name up in the registry
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139 // If name is not in registry, add it and return assigned value.
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140 // If name already exists in registry, return its assigned value
136
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141 TCHAR* chFormatName = StrToTCHARz(0, formatName);
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142 return OS.RegisterClipboardFormat(chFormatName);
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143 }
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144
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145 /**
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146 * Test that the object is of the correct format for this Transfer class.
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147 *
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148 * @param object a java representation of the data to be converted
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149 *
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150 * @return true if object is of the correct form for this transfer type
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151 *
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152 * @since 3.1
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153 */
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154 public bool validate(Object object) {
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155 return true;
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156 }
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157 }