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1 /*******************************************************************************
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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 * 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 org.eclipse.swt.dnd.HTMLTransfer;
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14
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15 import org.eclipse.swt.internal.gtk.OS;
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16 import org.eclipse.swt.dnd.ByteArrayTransfer;
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17 import org.eclipse.swt.dnd.TransferData;
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18 import org.eclipse.swt.dnd.DND;
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19 import java.lang.all;
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20
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48
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21 version(Tango){
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25
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22 static import tango.text.Util;
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48
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23 } else { // Phobos
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24 }
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25
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25
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26 /**
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27 * The class <code>HTMLTransfer</code> provides a platform specific mechanism
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28 * for converting text in HTML format represented as a java <code>String</code>
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29 * to a platform specific representation of the data and vice versa.
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30 *
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31 * <p>An example of a java <code>String</code> containing HTML text is shown
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32 * below:</p>
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33 *
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34 * <code><pre>
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35 * String htmlData = "<p>This is a paragraph of text.</p>";
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36 * </code></pre>
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37 *
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38 * @see Transfer
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39 */
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40 public class HTMLTransfer : ByteArrayTransfer {
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41
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42 private static HTMLTransfer _instance;
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43 private static const String TEXT_HTML = "text/html"; //$NON-NLS-1$
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44 private static const int TEXT_HTML_ID;
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45 private static const String TEXT_HTML2 = "TEXT/HTML"; //$NON-NLS-1$
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46 private static const int TEXT_HTML2_ID;
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47
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48 static this(){
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49 _instance = new HTMLTransfer();
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50 TEXT_HTML_ID = registerType(TEXT_HTML);
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51 TEXT_HTML2_ID = registerType(TEXT_HTML2);
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52 }
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53
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54 private this() {}
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55
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56 /**
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57 * Returns the singleton instance of the HTMLTransfer class.
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58 *
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59 * @return the singleton instance of the HTMLTransfer class
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60 */
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61 public static HTMLTransfer getInstance () {
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62 return _instance;
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63 }
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64
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65 /**
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66 * This implementation of <code>javaToNative</code> converts HTML-formatted text
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67 * represented by a java <code>String</code> to a platform specific representation.
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68 *
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69 * @param object a java <code>String</code> containing HTML text
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70 * @param transferData an empty <code>TransferData</code> object that will
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71 * be filled in on return with the platform specific format of the data
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72 *
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73 * @see Transfer#nativeToJava
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74 */
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75 public override void javaToNative (Object object, TransferData transferData){
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76 transferData.result = 0;
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77 if (!checkHTML(object) || !isSupportedType(transferData)) {
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78 DND.error(DND.ERROR_INVALID_DATA);
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79 }
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80 String string = (cast(ArrayWrapperString)object).array;
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81 char* pValue = cast(char*)OS.g_malloc(string.length);
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82 if (pValue is null) return;
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83 pValue[0 .. string.length ] = string;
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84 transferData.length = string.length;
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85 transferData.format = 8;
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86 transferData.pValue = pValue;
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87 transferData.result = 1;
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88 }
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89
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90 /**
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91 * This implementation of <code>nativeToJava</code> converts a platform specific
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92 * representation of HTML text to a java <code>String</code>.
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93 *
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94 * @param transferData the platform specific representation of the data to be converted
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95 * @return a java <code>String</code> containing HTML text if the conversion was successful;
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96 * otherwise null
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97 *
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98 * @see Transfer#javaToNative
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99 */
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100 public override Object nativeToJava(TransferData transferData){
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101 if ( !isSupportedType(transferData) || transferData.pValue is null ) return null;
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102 /* Ensure byteCount is a multiple of 2 bytes */
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103 int size = (transferData.format * transferData.length / 8) / 2 * 2;
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104 if (size <= 0) return null;
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105 String chars = transferData.pValue[ 0 .. size ].dup;
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106 return new ArrayWrapperString( chars[ 0 .. tango.text.Util.locate( chars, '\0' ) ] );
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107 }
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108 protected override int[] getTypeIds() {
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109 return [TEXT_HTML_ID, TEXT_HTML2_ID];
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110 }
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111
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112 protected override String[] getTypeNames() {
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113 return [TEXT_HTML, TEXT_HTML2];
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114 }
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115
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116 bool checkHTML(Object object) {
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117 if( object is null ) return false;
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118 auto arr = cast(ArrayWrapperString)object;
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119 if( arr is null ) return false;
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120 if( arr.array.length is 0 ) return false;
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121 return true;
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122 }
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123
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124 protected override bool validate(Object object) {
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125 return checkHTML(object);
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126 }
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127 }
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