Mercurial > projects > dwt-mac
annotate dwt/dnd/Transfer.d @ 45:d8635bb48c7c
Merge with SWT 3.5
author | Jacob Carlborg <doob@me.com> |
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date | Mon, 01 Dec 2008 17:07:00 +0100 |
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rev | line source |
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1 /******************************************************************************* |
45 | 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 *******************************************************************************/ |
45 | 11 module dwt.dnd.Transfer; |
12 | |
13 import dwt.dwthelper.utils; | |
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14 |
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15 |
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16 /** |
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17 * <code>Transfer</code> provides a mechanism for converting between a java |
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18 * representation of data and a platform specific representation of data and |
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19 * vice versa. It is used in data transfer operations such as drag and drop and |
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20 * clipboard copy/paste. |
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21 * |
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22 * <p>You should only need to become familiar with this class if you are |
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23 * implementing a Transfer subclass and you are unable to subclass the |
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24 * ByteArrayTransfer class.</p> |
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25 * |
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26 * @see ByteArrayTransfer |
45 | 27 * @see <a href="http://www.eclipse.org/swt/snippets/#dnd">Drag and Drop snippets</a> |
28 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: DNDExample</a> | |
29 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> | |
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30 */ |
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31 public abstract class Transfer { |
45 | 32 |
33 static String[] TYPES = new String[4]; | |
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 protected 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 protected 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) { |
45 | 138 /* Note the type 0 is not used */ |
139 int index = 1; | |
140 while (index < TYPES.length) { | |
141 String type = TYPES[index]; | |
142 if (type !is null && formatName.equals(type)) { | |
143 return index; | |
144 } | |
145 index++; | |
146 } | |
147 if (index is TYPES.length) { | |
148 String[] newTypes = new String[TYPES.length + 4]; | |
149 System.arraycopy(TYPES, 0, newTypes, 0, TYPES.length); | |
150 TYPES = newTypes; | |
151 } | |
152 TYPES[index] = formatName; | |
153 return index; | |
0
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154 } |
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155 |
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156 /** |
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157 * Test that the object is of the correct format for this Transfer class. |
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158 * |
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159 * @param object a java representation of the data to be converted |
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160 * |
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161 * @return true if object is of the correct form for this transfer type |
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162 * |
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163 * @since 3.1 |
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164 */ |
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165 protected bool validate(Object object) { |
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166 return true; |
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167 } |
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168 } |