1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.dnd;
import org.eclipse.swt.internal.carbon.CFRange;
import org.eclipse.swt.internal.carbon.OS;
/**
* The class <code>HTMLTransfer</code> provides a platform specific mechanism
* for converting text in HTML format represented as a java <code>String</code>
* to a platform specific representation of the data and vice versa.
*
* <p>An example of a java <code>String</code> containing HTML text is shown
* below:</p>
*
* <code><pre>
* String htmlData = "<p>This is a paragraph of text.</p>";
* </code></pre>
*
* @see Transfer
*/
public class HTMLTransfer extends ByteArrayTransfer {
static HTMLTransfer _instance = new HTMLTransfer();
static final String HTML = "HTML"; //$NON-NLS-1$
static final int HTMLID = registerType(HTML);
HTMLTransfer() {}
/**
* Returns the singleton instance of the HTMLTransfer class.
*
* @return the singleton instance of the HTMLTransfer class
*/
public static HTMLTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts HTML-formatted text
* represented by a java <code>String</code> to a platform specific representation.
*
* @param object a java <code>String</code> containing HTML text
* @param transferData an empty <code>TransferData</code> object that will
* be filled in on return with the platform specific format of the data
*
* @see Transfer#nativeToJava
*/
public void javaToNative (Object object, TransferData transferData){
if (!checkHTML(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String string = (String)object;
char[] chars = new char[string.length()];
string.getChars (0, chars.length, chars, 0);
transferData.result = -1;
int encoding = OS.CFStringGetSystemEncoding();
int cfstring = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, chars.length);
if (cfstring == 0) return;
byte[] buffer = null;
try {
CFRange range = new CFRange();
range.length = chars.length;
int[] size = new int[1];
int numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', false, null, 0, size);
if (numChars == 0) return;
buffer = new byte[size[0]];
numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', false, buffer, size [0], size);
if (numChars == 0) return;
} finally {
OS.CFRelease(cfstring);
}
transferData.data = new byte[1][];
transferData.data[0] = buffer;
transferData.result = OS.noErr;
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of HTML text to a java <code>String</code>.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java <code>String</code> containing HTML text if the conversion was successful;
* otherwise null
*
* @see Transfer#javaToNative
*/
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.data == null) return null;
if (transferData.data.length == 0 || transferData.data[0].length == 0) return null;
byte[] buffer = transferData.data[0];
int encoding = OS.CFStringGetSystemEncoding();
int cfstring = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, false);
if (cfstring == 0) return null;
try {
int length = OS.CFStringGetLength(cfstring);
if (length == 0) return null;
char[] chars = new char[length];
CFRange range = new CFRange();
range.length = length;
OS.CFStringGetCharacters(cfstring, range, chars);
return new String(chars);
} finally {
OS.CFRelease(cfstring);
}
}
protected int[] getTypeIds() {
return new int[] {HTMLID};
}
protected String[] getTypeNames() {
return new String[] {HTML};
}
boolean checkHTML(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
protected boolean validate(Object object) {
return checkHTML(object);
}
}
|
