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annotate dwt/dnd/HTMLTransfer.d @ 45:d8635bb48c7c

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Merge with SWT 3.5
author Jacob Carlborg <doob@me.com>
date Mon, 01 Dec 2008 17:07:00 +0100
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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 *******************************************************************************/
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11 module dwt.dnd.HTMLTransfer;
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13 import dwt.dwthelper.utils;
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15 import dwt.internal.cocoa.NSString;
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16 import dwt.internal.cocoa.OS;
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18 /**
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19 * The class <code>HTMLTransfer</code> provides a platform specific mechanism
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20 * for converting text in HTML format represented as a java <code>String</code>
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21 * to a platform specific representation of the data and vice versa.
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22 *
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23 * <p>An example of a java <code>String</code> containing HTML text is shown
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24 * below:</p>
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25 *
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26 * <code><pre>
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27 * String htmlData = "<p>This is a paragraph of text.</p>";
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28 * </code></pre>
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29 *
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30 * @see Transfer
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31 */
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32 public class HTMLTransfer extends ByteArrayTransfer {
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34 static HTMLTransfer _instance = new HTMLTransfer();
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35 static final String HTML = OS.NSHTMLPboardType.getString();
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36 static final int HTMLID = registerType(HTML);
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37
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38 HTMLTransfer() {}
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40 /**
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41 * Returns the singleton instance of the HTMLTransfer class.
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42 *
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43 * @return the singleton instance of the HTMLTransfer class
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44 */
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45 public static HTMLTransfer getInstance () {
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46 return _instance;
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47 }
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49 /**
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50 * This implementation of <code>javaToNative</code> converts HTML-formatted 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 HTML text
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54 * @param transferData an empty <code>TransferData</code> object that will
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55 * 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#nativeToJava
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58 */
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59 public void javaToNative (Object object, TransferData transferData){
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60 if (!checkHTML(object) || !isSupportedType(transferData)) {
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61 DND.error(DND.ERROR_INVALID_DATA);
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62 }
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63 transferData.data = NSString.stringWith((String) object);
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64 }
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66 /**
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67 * This implementation of <code>nativeToJava</code> converts a platform specific
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68 * representation of HTML text to a java <code>String</code>.
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69 *
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70 * @param transferData the platform specific representation of the data to be converted
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71 * @return a java <code>String</code> containing HTML text if the conversion was successful;
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72 * otherwise null
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73 *
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74 * @see Transfer#javaToNative
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75 */
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76 public Object nativeToJava(TransferData transferData){
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77 if (!isSupportedType(transferData) || transferData.data is null) return null;
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78 NSString string = (NSString) transferData.data;
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79 return string.getString();
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80 }
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81
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82 protected int[] getTypeIds() {
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83 return new int[] {HTMLID};
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84 }
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86 protected String[] getTypeNames() {
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87 return new String[] {HTML};
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88 }
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90 bool checkHTML(Object object) {
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91 return (object !is null && object instanceof String && ((String)object).length() > 0);
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92 }
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93
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94 protected bool validate(Object object) {
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95 return checkHTML(object);
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96 }
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97 }