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annotate dwt/dnd/HTMLTransfer.d @ 9:e76aa0b07480

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Some more instanceof
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:36:41 +0200
parents e831403a80a9
children d8635bb48c7c
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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.OS;
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14
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15 /**
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16 * The class <code>HTMLTransfer</code> provides a platform specific mechanism
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17 * for converting text in HTML format represented as a java <code>String</code>
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18 * to a platform specific representation of the data and vice versa. See
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19 * <code>Transfer</code> for additional information.
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20 *
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21 * <p>An example of a java <code>String</code> containing HTML 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 htmlData = "<p>This is a paragraph of text.</p>";
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26 * </code></pre>
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27 */
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28 public class HTMLTransfer : ByteArrayTransfer {
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29
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30 static HTMLTransfer _instance = new HTMLTransfer();
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31 static final String HTML = "HTML"; //$NON-NLS-1$
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32 static final int HTMLID = registerType(HTML);
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33
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34 this() {}
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35
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36 /**
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37 * Returns the singleton instance of the HTMLTransfer class.
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38 *
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39 * @return the singleton instance of the HTMLTransfer class
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40 */
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41 public static HTMLTransfer getInstance () {
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42 return _instance;
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43 }
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44
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45 /**
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46 * This implementation of <code>javaToNative</code> converts HTML-formatted text
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47 * represented by a java <code>String</code> to a platform specific representation.
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48 * For additional information see <code>Transfer#javaToNative</code>.
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49 *
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50 * @param object a java <code>String</code> containing HTML text
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51 * @param transferData an empty <code>TransferData</code> object; this
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52 * object will be filled in on return with the platform specific format of the data
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53 */
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54 public void javaToNative (Object object, TransferData transferData){
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55 if (!checkHTML(object) || !isSupportedType(transferData)) {
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56 DND.error(DND.ERROR_INVALID_DATA);
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57 }
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58 String String = cast(String)object;
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59 int count = String.length();
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60 char[] chars = new char[count];
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61 String.getChars(0, count, chars, 0);
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62 byte[] buffer = new byte[chars.length * 2];
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63 OS.memmove(buffer, chars, buffer.length);
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64 transferData.data = new byte[1][];
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65 transferData.data[0] = buffer;
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66 transferData.result = OS.noErr;
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67 }
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68
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69 /**
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70 * This implementation of <code>nativeToJava</code> converts a platform specific
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71 * representation of HTML text to a java <code>String</code>.
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72 * For additional information see <code>Transfer#nativeToJava</code>.
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73 *
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74 * @param transferData the platform specific representation of the data to be
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75 * been converted
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76 * @return a java <code>String</code> containing HTML text if the
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77 * conversion was successful; otherwise null
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78 */
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79 public Object nativeToJava(TransferData transferData){
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80 if (!isSupportedType(transferData) || transferData.data is null) return null;
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81 if (transferData.data.length is 0 || transferData.data[0].length is 0) return null;
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82 byte[] buffer = transferData.data[0];
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83 char[] chars = new char[(buffer.length + 1) / 2];
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84 OS.memmove(chars, buffer, buffer.length);
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85 return new String(chars);
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86 }
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87
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88 protected int[] getTypeIds() {
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89 return new int[] {HTMLID};
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90 }
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91
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92 protected String[] getTypeNames() {
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93 return new String[] {HTML};
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94 }
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95
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96 bool checkHTML(Object object) {
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97 return (object !is null && null !is cast(String)object && (cast(String)object).length() > 0);
0
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98 }
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99
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100 protected bool validate(Object object) {
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101 return checkHTML(object);
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102 }
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103 }