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annotate dwt/dnd/TextTransfer.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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children 1a8b3cb347e0
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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 *******************************************************************************/
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11 module dwt.dnd;
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12
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13 import dwt.internal.carbon.CFRange;
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14 import dwt.internal.carbon.OS;
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15
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16 /**
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17 * The class <code>TextTransfer</code> provides a platform specific mechanism
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18 * for converting plain text represented as a java <code>String</code>
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19 * to a platform specific representation of the data and vice versa.
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20 *
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21 * <p>An example of a java <code>String</code> containing plain text is shown
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22 * below:</p>
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23 *
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24 * <code><pre>
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25 * String textData = "Hello World";
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26 * </code></pre>
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27 *
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28 * @see Transfer
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29 */
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30 public class TextTransfer : ByteArrayTransfer {
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31
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32 static TextTransfer _instance = new TextTransfer();
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33 static final String TEXT = "TEXT"; //$NON-NLS-1$
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34 static final String UTEXT = "utxt"; //$NON-NLS-1$
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35 static final int TEXTID = OS.kScrapFlavorTypeText;
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36 static final int UTEXTID = OS.kScrapFlavorTypeUnicode;
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37
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38 TextTransfer() {}
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39
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40 /**
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41 * Returns the singleton instance of the TextTransfer class.
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42 *
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43 * @return the singleton instance of the TextTransfer class
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44 */
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45 public static TextTransfer getInstance () {
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46 return _instance;
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47 }
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48
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49 /**
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50 * This implementation of <code>javaToNative</code> converts plain text
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51 * represented by a java <code>String</code> to a platform specific representation.
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52 *
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53 * @param object a java <code>String</code> containing text
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54 * @param transferData an empty <code>TransferData</code> object; this object
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55 * will be filled in on return with the platform specific format of the data
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56 *
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57 * @see Transfer#javaToNative
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58 */
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59 public void javaToNative (Object object, TransferData transferData) {
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60 if (!checkText(object) || !isSupportedType(transferData)) {
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61 DND.error(DND.ERROR_INVALID_DATA);
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62 }
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63 String String = (String)object;
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64 char[] chars = new char[String.length()];
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65 String.getChars (0, chars.length, chars, 0);
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66 transferData.result = -1;
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67 switch (transferData.type) {
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68 case TEXTID: {
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69 int cfString = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, chars.length);
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70 if (cfString is 0) return;
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71 byte[] buffer = null;
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72 try {
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73 CFRange range = new CFRange();
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74 range.length = chars.length;
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75 int encoding = OS.CFStringGetSystemEncoding();
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76 int[] size = new int[1];
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77 int numChars = OS.CFStringGetBytes(cfString, range, encoding, (byte)'?', true, null, 0, size);
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78 if (numChars is 0) return;
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79 buffer = new byte[size[0]];
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80 numChars = OS.CFStringGetBytes(cfString, range, encoding, (byte)'?', true, buffer, size [0], size);
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81 if (numChars is 0) return;
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82 } finally {
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83 OS.CFRelease(cfString);
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84 }
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85 transferData.data = new byte[1][];
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86 transferData.data[0] = buffer;
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87 transferData.result = OS.noErr;
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88 break;
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89 }
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90 case UTEXTID: {
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91 byte[] buffer = new byte[chars.length * 2];
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92 OS.memmove(buffer, chars, buffer.length);
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93 transferData.data = new byte[1][];
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94 transferData.data[0] = buffer;
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95 transferData.result = OS.noErr;
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96 break;
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97 }
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98 }
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99 }
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100
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101 /**
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102 * This implementation of <code>nativeToJava</code> converts a platform specific
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103 * representation of plain text to a java <code>String</code>.
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104 *
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105 * @param transferData the platform specific representation of the data to be converted
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106 * @return a java <code>String</code> containing text if the conversion was successful; otherwise null
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107 *
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108 * @see Transfer#nativeToJava
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109 */
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110 public Object nativeToJava(TransferData transferData){
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111 if (!isSupportedType(transferData) || transferData.data is null) return null;
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112 if (transferData.data.length is 0 || transferData.data[0].length is 0) return null;
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113 byte[] buffer = transferData.data[0];
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114 switch (transferData.type) {
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115 case TEXTID: {
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116 int encoding = OS.CFStringGetSystemEncoding();
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117 int cfString = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, true);
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118 if (cfString is 0) return null;
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119 try {
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120 int length = OS.CFStringGetLength(cfString);
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121 if (length is 0) return null;
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122 char[] chars = new char[length];
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123 CFRange range = new CFRange();
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124 range.length = length;
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125 OS.CFStringGetCharacters(cfString, range, chars);
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126 return new String(chars);
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127 } finally {
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128 OS.CFRelease(cfString);
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129 }
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130 }
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131 case UTEXTID: {
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132 char[] chars = new char[(buffer.length + 1) / 2];
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133 OS.memmove(chars, buffer, buffer.length);
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134 return new String(chars);
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135 }
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136 }
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137 return null;
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138 }
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139
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140 protected int[] getTypeIds() {
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141 return new int[] {UTEXTID, TEXTID};
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142 }
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143
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144 protected String[] getTypeNames() {
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145 return new String[] {UTEXT, TEXT};
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146 }
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147
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148 bool checkText(Object object) {
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149 return (object !is null && object instanceof String && ((String)object).length() > 0);
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150 }
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151 protected bool validate(Object object) {
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152 return checkText(object);
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153 }
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154 }