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comparison dwt/dnd/HTMLTransfer.d @ 0:380af2bdd8e5

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author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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1 /*******************************************************************************
2 * Copyright (c) 2000, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 *******************************************************************************/
11 module dwt.dnd;
12
13 import dwt.internal.carbon.OS;
14
15 /**
16 * The class <code>HTMLTransfer</code> provides a platform specific mechanism
17 * for converting text in HTML format represented as a java <code>String</code>
18 * to a platform specific representation of the data and vice versa. See
19 * <code>Transfer</code> for additional information.
20 *
21 * <p>An example of a java <code>String</code> containing HTML text is shown
22 * below:</p>
23 *
24 * <code><pre>
25 * String htmlData = "<p>This is a paragraph of text.</p>";
26 * </code></pre>
27 */
28 public class HTMLTransfer : ByteArrayTransfer {
29
30 static HTMLTransfer _instance = new HTMLTransfer();
31 static final String HTML = "HTML"; //$NON-NLS-1$
32 static final int HTMLID = registerType(HTML);
33
34 HTMLTransfer() {}
35
36 /**
37 * Returns the singleton instance of the HTMLTransfer class.
38 *
39 * @return the singleton instance of the HTMLTransfer class
40 */
41 public static HTMLTransfer getInstance () {
42 return _instance;
43 }
44
45 /**
46 * This implementation of <code>javaToNative</code> converts HTML-formatted text
47 * represented by a java <code>String</code> to a platform specific representation.
48 * For additional information see <code>Transfer#javaToNative</code>.
49 *
50 * @param object a java <code>String</code> containing HTML text
51 * @param transferData an empty <code>TransferData</code> object; this
52 * object will be filled in on return with the platform specific format of the data
53 */
54 public void javaToNative (Object object, TransferData transferData){
55 if (!checkHTML(object) || !isSupportedType(transferData)) {
56 DND.error(DND.ERROR_INVALID_DATA);
57 }
58 String String = (String)object;
59 int count = String.length();
60 char[] chars = new char[count];
61 String.getChars(0, count, chars, 0);
62 byte[] buffer = new byte[chars.length * 2];
63 OS.memmove(buffer, chars, buffer.length);
64 transferData.data = new byte[1][];
65 transferData.data[0] = buffer;
66 transferData.result = OS.noErr;
67 }
68
69 /**
70 * This implementation of <code>nativeToJava</code> converts a platform specific
71 * representation of HTML text to a java <code>String</code>.
72 * For additional information see <code>Transfer#nativeToJava</code>.
73 *
74 * @param transferData the platform specific representation of the data to be
75 * been converted
76 * @return a java <code>String</code> containing HTML text if the
77 * conversion was successful; otherwise null
78 */
79 public Object nativeToJava(TransferData transferData){
80 if (!isSupportedType(transferData) || transferData.data is null) return null;
81 if (transferData.data.length is 0 || transferData.data[0].length is 0) return null;
82 byte[] buffer = transferData.data[0];
83 char[] chars = new char[(buffer.length + 1) / 2];
84 OS.memmove(chars, buffer, buffer.length);
85 return new String(chars);
86 }
87
88 protected int[] getTypeIds() {
89 return new int[] {HTMLID};
90 }
91
92 protected String[] getTypeNames() {
93 return new String[] {HTML};
94 }
95
96 bool checkHTML(Object object) {
97 return (object !is null && object instanceof String && ((String)object).length() > 0);
98 }
99
100 protected bool validate(Object object) {
101 return checkHTML(object);
102 }
103 }