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1
11 package org.eclipse.swt.dnd;
12
13 import org.eclipse.swt.internal.ole.win32.*;
14 import org.eclipse.swt.internal.win32.*;
15
16
29 public class HTMLTransfer extends ByteArrayTransfer {
30
31 static HTMLTransfer _instance = new HTMLTransfer();
32 static final String  HTML_FORMAT = "HTML Format"; static final int HTML_FORMATID = registerType(HTML_FORMAT);
34 static final String NUMBER = "00000000"; static final String HEADER = "Version:0.9\r\nStartHTML:"+NUMBER+"\r\nEndHTML:"+NUMBER+"\r\nStartFragment:"+NUMBER+"\r\nEndFragment:"+NUMBER+"\r\n";
36 static final String PREFIX = "<html><body><!--StartFragment-->"; static final String SUFFIX = "<!--EndFragment--></body></html>"; static final String StartFragment = "StartFragment:"; static final String EndFragment = "EndFragment:";
41 private HTMLTransfer() {}
42
43
48 public static HTMLTransfer getInstance () {
49 return _instance;
50 }
51
52
61 public void javaToNative (Object object, TransferData transferData){
62 if (!checkHTML(object) || !isSupportedType(transferData)) {
63 DND.error(DND.ERROR_INVALID_DATA);
64 }
65 String string = (String )object;
66 int count = string.length();
67 char[] chars = new char[count + 1];
68 string.getChars(0, count, chars, 0);
69 int codePage = OS.GetACP();
70 int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null);
71 if (cchMultiByte == 0) {
72 transferData.stgmedium = new STGMEDIUM();
73 transferData.result = COM.DV_E_STGMEDIUM;
74 return;
75 }
76 int startHTML = HEADER.length();
77 int startFragment = startHTML + PREFIX.length();
78 int endFragment = startFragment + cchMultiByte - 1;
79 int endHTML = endFragment + SUFFIX.length();
80
81 StringBuffer buffer = new StringBuffer (HEADER);
82 int maxLength = NUMBER.length();
83 int start = buffer.toString().indexOf(NUMBER);
85 String temp = Integer.toString(startHTML);
86 buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
87 start = buffer.toString().indexOf(NUMBER, start);
89 temp = Integer.toString(endHTML);
90 buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
91 start = buffer.toString().indexOf(NUMBER, start);
93 temp = Integer.toString(startFragment);
94 buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
95 start = buffer.toString().indexOf(NUMBER, start);
97 temp = Integer.toString(endFragment);
98 buffer.replace(start + maxLength-temp.length(), start + maxLength, temp);
99
100 buffer.append(PREFIX);
101 buffer.append(string);
102 buffer.append(SUFFIX);
103
104 count = buffer.length();
105 chars = new char[count + 1];
106 buffer.getChars(0, count, chars, 0);
107 cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null);
108 int lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
109 OS.WideCharToMultiByte(codePage, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);
110 transferData.stgmedium = new STGMEDIUM();
111 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
112 transferData.stgmedium.unionField = lpMultiByteStr;
113 transferData.stgmedium.pUnkForRelease = 0;
114 transferData.result = COM.S_OK;
115 return;
116 }
117
118
128 public Object nativeToJava(TransferData transferData){
129 if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;
130 IDataObject data = new IDataObject(transferData.pIDataObject);
131 data.AddRef();
132 STGMEDIUM stgmedium = new STGMEDIUM();
133 FORMATETC formatetc = transferData.formatetc;
134 stgmedium.tymed = COM.TYMED_HGLOBAL;
135 transferData.result = data.GetData(formatetc, stgmedium);
136 data.Release();
137 if (transferData.result != COM.S_OK) return null;
138 int hMem = stgmedium.unionField;
139
140 try {
141 int lpMultiByteStr = OS.GlobalLock(hMem);
142 if (lpMultiByteStr == 0) return null;
143 try {
144 int codePage = OS.GetACP();
145 int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0);
146 if (cchWideChar == 0) return null;
147 char[] lpWideCharStr = new char [cchWideChar - 1];
148 OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length);
149 String string = new String (lpWideCharStr);
150 int fragmentStart = 0, fragmentEnd = 0;
151 int start = string.indexOf(StartFragment) + StartFragment.length();
152 int end = start + 1;
153 while (end < string.length()) {
154 String s = string.substring(start, end);
155 try {
156 fragmentStart = Integer.parseInt(s);
157 end++;
158 } catch (NumberFormatException e) {
159 break;
160 }
161 }
162 start = string.indexOf(EndFragment) + EndFragment.length();
163 end = start + 1;
164 while (end < string.length()) {
165 String s = string.substring(start, end);
166 try {
167 fragmentEnd = Integer.parseInt(s);
168 end++;
169 } catch (NumberFormatException e) {
170 break;
171 }
172 }
173 if (fragmentEnd <= fragmentStart || fragmentEnd > lpWideCharStr.length) return null;
174
178 String s = string.substring(fragmentStart, fragmentEnd);
179
182 String foxStart = "<!--StartFragment -->\r\n"; int prefix = s.indexOf(foxStart);
184 if (prefix != -1) {
185 prefix += foxStart.length();
186 s = s.substring(prefix);
187 }
188 return s;
189 } finally {
190 OS.GlobalUnlock(hMem);
191 }
192 } finally {
193 OS.GlobalFree(hMem);
194 }
195 }
196 protected int[] getTypeIds(){
197 return new int[] {HTML_FORMATID};
198 }
199 protected String [] getTypeNames(){
200 return new String [] {HTML_FORMAT};
201 }
202 boolean checkHTML(Object object) {
203 return (object != null && object instanceof String && ((String )object).length() > 0);
204 }
205 protected boolean validate(Object object) {
206 return checkHTML(object);
207 }
208 }
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